Bk 8600 Series Programming Manual User

2017-07-06

User Manual: Bk 8600 Series Programming Manual 8600_Series_programming_manual en-us programming_manuals s

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Models: 8600, 8601, 8602, 8610, 8612, 8614, 8616

Programmable DC Electronic Loads
PROGRAMMING MANUAL

Safety Summary
The following general safety precautions must be observed during all phases of operation of this
instrument. Failure to comply with these precautions or with specific warnings elsewhere in this
manual violates safety standards of design, manufacture, and intended use of the instrument. We
assume no liability for the customer’s failure to comply with these requirements.
ENVIRONMENTAL CONDITIONS
This instrument is intended for indoor use, pollution degree 2 environments. It is designed to operate
at a maximum relative humidity of 95% and at altitudes of up to 2000 meters. Refer to the
specifications tables for the AC mains voltage requirements and ambient operating temperature range.
BEFORE APPLYING POWER
Verify that all safety precautions are taken. Note the instrument's external markings described under
"Safety Symbols".
GROUND THE INSTRUMENT
This product is a Safety Class 1 instrument (provided with a protective earth terminal). To minimize
shock hazard, the instrument chassis and cover must be connected to an electrical ground. The
instrument must be connected to the AC mains power through a grounded power cable, with the
ground wire firmly connected to an electrical ground (safety ground) at the power outlet. Note: Any
interruption of the protective (grounding) conductor or disconnection of the protective earth terminal
will cause a potential shock hazard that could result in personal injury.
DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE
Do not operate the instrument in the presence of fumes or flammable gases.
KEEP AWAY FROM LIVE CIRCUITS
Operating personnel must not remove instrument covers except as instructed in this guide for
installing or removing electronic load modules. Component replacement and internal adjustments
must be made only by qualified service personnel. Do not replace components with power cable
connected. Under certain conditions dangerous voltages may exist even with the power cable
removed. To avoid injuries, always disconnect power, discharge circuits, and remove external voltage
sources before touching components.
DO NOT SERVICE OR ADJUST ALONE
Do not try to do some internal service or adjustment unless another person capable of rendering first
aid resuscitation is present.

Safety Symbols
Direct current
Alternating current
Both direct and alternating current
Protective earth (ground) terminal
Attention (refer to accompanying documents)

WARNING
The WARNING sign denotes a hazard. It calls attention to a procedure, practice, or the like, which,
if not correctly performed or adhered to, could result in personal injury. Do not proceed beyond a
WARNING sign until the indicated conditions are fully understood and met.

CAUTION
The CAUTION sign denotes a hazard. It calls attention to an operating procedure, or the like, which,
if not correctly performed or adhered to, could result in damage to or destruction of part or all of
the product. Do not proceed beyond a CAUTION sign until the indicated conditions are fully
understood and met.

Chapter 5 ................................................................................................. 79
Error Messages ........................................................................................ 79

Chapter 1
Introduction to Programming
This guide contains programming information for the B&K Precision 8600 series DC electronic load.
Unless otherwise noted, this document will refer to all of these instruments as “electronic load”.

1.1 GPIB Capabilities of the Electronic Load
All electronic load functions except for setting the communication parameters are programmable over
the GPIB. The IEEE 488.2 capabilities of the electronic load are described in the table below.
GPIB Capabilities

Response

Interface
Function

Talker/Listener

All electronic load functions except for setting the communication
parameters are programmable over the GPIB. The electronic load can
send and receive messages over the GPIB. Status information is sent
using a serial poll.

AH1, SH1,
T6, L4

Service Request

The electronic load sets the SRQ line true if there is an enabled service
request condition.

SR1

Remote/Local

In local mode, the electronic load is controlled from the front panel but
will also execute commands sent over the GPIB. The electronic load
powers up in local mode and remains in local mode until it receives a
command over the GPIB. Once the electronic load is in remote mode,
the front panel REM annunciator turns on, all front panel keys (except
Shift + Local) are disabled, and the display is in normal metering mode.
Pressing Shift + Local on the front panel returns the electronic load to
local mode. This can be disabled using local lockout so that only the
controller or the power switch can return the electronic load to local
mode.

RL1

Device Trigger

The electronic load will respond to the device trigger function.

DT1

Group Execute
Trigger

The electronic load will respond to the group execute trigger function.

GET

Device Clear

The electronic load responds to the Device Clear (DCL) and
Selected Device Clear (SDC) interface commands. They cause the
electronic load to clear any activity that would prevent it from
receiving and executing a new command (including *WAI and
*OPC?). DCL and SDC do not change any programmed settings.

DCL,SDC

GPIB Address
The electronic load operates from a GPIB address that is set from the front panel. To set the GPIB
address, press Shift + ⑦ (System menu) on the front panel and enter the address using the Entry keys.
The address can be set from 0 to 30. The GPIB address is stored in non-volatile memory.

1.2 RS-232 Capabilities of the Electronic Load
Use a cable with two serial interfaces (DB9) to connect the electronic load and PC. It can be activated
by selecting in of the System menu (Shift + 8 on the front panel). NOTE:
There are two serial interfaces on the rear panel: the top 9-pin COM (female) interface is the RS-232
communication interface and the bottom 9-pin COM (male) serial port connection is not for use. All
SCPI commands are available through RS-232 programming. The EIA RS-232 standard defines the
interconnections between data terminal equipment (DTE) and data communications equipment (DCE).
The electronic load is designed to be a DTE and can be connected to another DTE such as a PC COM
port through a null modem cable.

NOTE: The RS-232 settings in your program must match the settings specified in the front panel System
menu. Press Shift + 8 on the front panel to enter the System menu if you need to change the settings.
You can break data transmissions by sending a ^C or ^X character string to the electronic load. This
clears any pending operation and discards any pending output.

RS-232 Data Format
The RS-232 data is a 10-bit word with one start bit and one stop bit.
Parity=None

Start Bit

8 Data Bits

Stop Bit

The number of start and stop bits are not programmable. However, the following parameters are
selectable in the System menu using the front panel Shift + 8 key.

Baud Rate
The System menu (Shift + 8) lets you select one of the following baud rates, which are stored in nonvolatile memory: 4800, 9600, 19200, 38400, 57600, or 115200.

Parity
None - eight data bits without parity
Even - seven data bits with even parity
Odd - seven data bits with odd parity

RS-232 Flow Control
The RS-232 interface supports the following flow control options. For each case, the electronic load will
send a maximum of five characters after hold-off is asserted by the controller. The electronic load is
capable of receiving as many as fifteen additional characters after it asserts hold-off.
 The electronic load asserts its Request to Send (RTS) line to signal hold-off when its input buffer
is almost full, and it interprets its Clear to Send (CTS) line as a hold-off signal from the
controller.
 When the input queue of the electronic load becomes more than ¾ full, the instrument issues
an X-OFF command. The control program should respond to this and stop sending characters
until the electronic load issues the X-ON, which it will do once its input buffer has dropped
below half-full. The electronic load recognizes X_ON and X_OFF sent from the controller. An XOFF will cause the electronic load to stop outputting characters until it sees an X-ON.
 NONE: There is no flow control.
Flow control options are stored in non-volatile memory.

RS-232 Connections
The RS-232 serial port can be connected to the serial port of a controller (i.e., personal computer) using
a null modem RS-232 cable terminated with DB-9 connectors. Figure 1 shows the pinout for the
connector.
If your computer uses a DB-25 connector for the RS-232 interface, you will need a cable or adapter
with a DB-25 connector on one end and a DB-9 connector on the other. It must be a straight-through
(not null modem) cable.

Figure 1 - RS-232 Connector Pinout

Pin
1
2
3

Signal
NC
TXD
RXD

Description
No Connection
Transmit Data
Receive Data

4
5
6
7
8
9

NC
GND
NC
CTS
RTS
NC

No Connection
Ground
No Connection
Clear to Send
Ready to Send
No Connection

RS-232 Troubleshooting
If you are having trouble communicating over the RS-232 interface, check the following:
 The computer and the electronic load must be configured for the same baud rate, parity,
number of data bits, and flow control options. Note that the electronic load is configured for 1
start bit and 1 stop bit (these values are fixed).
 The correct interface cables or adapters must be used, as described under the RS-232
connector. Note that even if the cable has the proper connectors for your system, the internal
wiring may be incorrect.
 The interface cable must be connected to the correct serial port on your computer (COM1,
COM2, etc.) and the correct 9-pin serial port on the mainframe.

1.3 USB-TMC Capabilities of the Electronic Load
All electronic load functions are programmable over the USB.
The USB488 interface capabilities of the electronic load are described below:
 The interface is IEEE 488.2 standard USB488 interface.
 The interface accepts REN_CONTROL, GO_TO_LOCAL, and LOCAL_LOCKOUT requests.
 The interface accepts MsgID = TRIGGER USBTMC command message and forwards TRIGGER
requests to the function layer.
The USB488 device capabilities of the electronic load are described below:
 The device understands all mandatory SCPI commands.
 The device is SR1 capable.
 The device is RL1 capable.
 The device is DT1 capable.

1.4 Programming the Status Registers
You can use status register programming to determine the operating condition of the electronic load at
any time. For example, you may program the electronic load to generate an interrupt (assert SRQ)
8

when an event such as a current protection occurs. When the interrupt occurs, your program can then
act on the event in the appropriate fashion.
The following table defines the status bits. Figure shows the status register structure of the electronic
load. The Standard Event, Status Byte, and Service Request Enable registers and the Output Queue
perform standard GPIB functions as defined in the IEEE 488.2 Standard Digital Interface for
Programmable Instrumentation. The Operation Status and Questionable Status registers implement
functions that are specific to the electronic load.
Bit Configurations of Status Registers
Operation Status Group
Bit

Signal

Meaning

CAL

Calibrating. The electronic load is computing new calibration constants.

TRG

Waiting. The electronic load is waiting for a trigger.
Status Group

Bit

Meaning

Voltage Fault. Either an overvoltage or a reverse voltage has occurred. This bit
reflects the active state of the FLT pin on the back of the unit. The bit remains
set until the condition is removed and PROT:CLE is programmed.

Overcurrent. An overcurrent condition has occurred. This occurs if the current
exceeds 102% of the rated current or if it exceeds the user-programmed
current protection level. Removing the overcurrent condition clears the bit. If
the condition persists beyond the user programmable delay time, PS bit is also
set and the input is turned off. Both bits remain set until the condition is
removed and PROT:CLE is programmed.

Remote Sense. When the remote sense is connected, this bit is set.

Overpower. An overpower condition has occurred. This occurs if the unit
exceeds the max power or it exceeds the user-programmed power protection
level. Removing the overpower condition clears the bit. If the condition
persists beyond the user programmable delay time, PS bit is also set and the
input is turned off. Both bits remain set until the condition is removed and
PROT:CLE is programmed.

Signal

Overtemperature. An overtemperature condition has occurred. Both this bit
and PS bit are set and the input is turned off. Both bits remain set until the unit
is cooled down and PROT:CLE is programmed.

RUN

List run or stop status. When list is running, this bit is set.

EPU

Extended Power Unavailable. This bit is not used.

RRV

Remote Reverse Voltage. A reverse voltage condition has occurred on the
sense terminals. Both this bit and VF bit are set. Removing the reverse voltage
clears this bit but does not clear VF bit. VF bit remains set until PROT:CLE is
programmed.

UNR

Unregulated. The input is unregulated. When the input is regulated this bit is
cleared.

LRV

Local Reverse Voltage. A reverse voltage condition has occurred on the input
terminals. Both this bit and VF bit are set. Removing the reverse voltage clears
this bit but does not clear PS bit. PS bit remains set until PROT:CLE is
programmed.

Overvoltage. An overvoltage condition has occurred. Both this bit and VF bit 0
are set and the electronic loads are turned off. Both bits remain set until the
condition is removed and PROT:CLE is programmed.

Protection Shutdown. The protection shutdown circuit has tripped because of
an overcurrent, overpower, or overtemperature condition. The bit remains set
until PROT:CLE is programmed.

VON

Voltage of sink current on. When the voltage of input exceeds the userprogrammed Von level, this bit is set.

TBF

Trace Buffer Full.
Questionable Status Group
Standard Event Status Group

Bit

Signal

Meaning

OPC

Operation Complete. The load has completed all pending operations. *OPC
must be programmed for this bit to be set when pending operations are
complete.

QYE

Query Error. The output queue was read with no data present or the data was
lost. Errors in the range of 499 through 400 can set this bit.

DDE

Device-Dependent Error. Memory was lost or self-test failed. Errors in the
range of 399 through 300 can set this bit.

EXE

CME

PON

Execution Error. A command parameter was outside its legal range,
inconsistent with the load's operation, or prevented from executing because
of an operating condition. Errors in the range of 299 through 200 can set this
bit.
Command Error. A syntax or semantic error has occurred or the load received
a within a program message. Errors in the range of 199 through 100 can
set this bit.
Power-On. The unit has been turned off and then on since this bit was last
read.
Status Byte and Service Request Enable Registers

Bit

Signal

EAV

QUES

Questionable Status Summary. Indicates if an enabled questionable event has
occurred.

MAV

Message Available Summary. Indicates if the Output Queue contains data.

ESB

Event Status Summary. Indicates if an enabled standard event has occurred.

Meaning
Error Available Summary. Indicates if the Error Queue contains data.

Request Service. During a serial poll, RQS is returned and cleared.
RQS/MSS Master Status Summary. For an *STB? query, MSS is returned without being
cleared.
OPER

Operation Status Summary. Indicates if an operation event has occurred.

Figure 2 - Load Status Register Structure

Condition registers
All status register sets have a condition register. A condition register is a real-time, read-only register
that constantly updates to reflect the current operating conditions of the instrument.
Use the :CONDition? query commands in the STATus Subsystem to read the condition registers. See
Chapter 3 for more information.
Event registers
Each status register set has an event register. An event register is a latched, read-only register whose
bits are set by the corresponding condition register. Once a bit in an event register is set, it remains set
(latched) until the register is cleared by a specific clearing operation. The bits of an event register are
logically ANDed with the bits of the corresponding enable register and applied to an OR gate. The
output of the OR gate is applied to the Status Byte Register.
Use the *ESR? Common Command to read the Standard Event Register. All other event registers are
read using the :EVENt? query commands in the STATus Subsystem. See Chapter 3 for more
information.
An event register is cleared when it is read. The following operations clear all event registers:

Cycling power

Sending *CLS
Enable registers
Each status register set has an enable register. An enable register is programmed by you and serves as
a mask for the corresponding event register. An event bit is masked when the corresponding bit in the
enable register is cleared (0). When masked, a set bit in an event register cannot set a bit in the Status
Byte Register (1 AND 0 = 0). To use the Status Byte Register to detect events (i.e., serial poll), you must
unmask the events by setting (1) the appropriate bits of the enable registers. To program and query
the Standard Event Status Register, use the *ESE and *ESE? Common Commands respectively. All other
enable registers are programmed and queried using the :ENABle and :ENABLe? commands in the
STATus Subsystem. See Chapter 3 for more information.
An enable register is not cleared when it is read. The following operations affect the enable registers:

Cycling power clears all enable registers

:STATus:PREset clears the following enable registers:
o Operation Event Enable Register
o Questionable Event Enable Register

*ESE 0 clears the Standard Event Status Enable Register.
Output queue
The output queue holds data that pertains to the normal operation of the instrument. For example,
when a query command is sent, the response message is placed on the output queue.




Cycling power
Sending the *CLS common command

Trigger model operation
Once the instrument is taken out of idle, operation proceeds through the trigger model down to the
device action.
Control Source — As shown in Figure 3, a control source is used to hold up operation until the
programmed event occurs. The control source options are explained as follows:
 HOLD — Only the TRIG:IMM command will generate a trigger in HOLD mode. All other trigger
commands are ignored.
 MANual — Event detection is satisfied by pressing the TRIG key.
 TIMer — This generates triggers that are in synchronization with the electronic load's internal
oscillator as the trigger source. The internal oscillator begins running as soon as this command
is executed. Use TRIG:TIM to program the oscillator period.
 EXTernal — Event detection is satisfied when an input trigger via the TRIGGER LINK connector is
received by the electronic load.
 BUS — Event detection is satisfied when a bus trigger (GET or *TRG) is received by the
electronic load.
Delay — A programmable delay is available after the event detection. The delay can be manually set
from 0 to 999999.999 seconds.

Chapter 2
Introduction to SCPI
SCPI (Standard Commands for Programmable Instruments) is a programming language for controlling
instrument functions over GPIB, RS-232, USB, and Ethernet interface. SCPI is layered on top of the
hardware portion of IEEE 488.2. The same SCPI commands and parameters control the same functions
in different classes of instruments.
Conventions Used in This Guide
Angle brackets

Items within angle brackets are parameter abbreviations. For example,
indicates a specific form of numerical data.

Vertical bar

Vertical bars separate alternative parameters. For example, NORM | TEXT
indicates that either "NORM" or "TEXT" can be used as a parameter.

Square Brackets [ ]

Items within square brackets are optional. The representation [SOURce:]
VOLTage means that SOURce: may be omitted.

Braces

Braces indicate parameters that may be repeated zero or more times. It is
used especially for showing arrays. The notation {<,B>} shows that
parameter "A" must be entered, while parameter "B" may be omitted or may
be entered one or more times.

{}

2.1 Types of SCPI Commands
SCPI has two types of commands, common and subsystem.
Common:
Common commands generally are not related to specific operation but to controlling overall
electronic load functions, such as reset, status, and synchronization. All common commands
consist of a three-letter mnemonic preceded by an asterisk (ex:*RST, *IDN?, *SRE 8).
Subsystem:
Subsystem commands perform specific electronic load functions. They are organized into an
inverted tree structure with the "root" at the top. The following figure shows a portion of a
subsystem command tree, from which you access the commands located along the various paths.

Figure 4 - Partial Command Tree

Multiple Commands in a Message
Multiple SCPI commands can be combined and sent as a single message with one message terminator.
There are two important considerations when sending several commands within a single message:



Use a semicolon to separate commands within a message.
There is an implied header path that affects how commands are interpreted by the
electronic load.

The header path can be thought of as a string that gets inserted before each command within a
message. For the first command in a message, the header path is a null string. For each subsequent
command the header path is defined as the characters that make up the headers of the previous
command in the message up to and including the last colon separator. An example of a message with
two commands is:
CURR:LEV 3;PROT:STAT OFF
which shows the use of the semicolon separating the two commands, and also illustrates the header
path concept. Note that with the second command, the leading header "CURR" was omitted because
after the "CURR:LEV 3" command, the header path became defined as "CURR" and thus the instrument
interpreted the second command as:
CURR:PROT:STAT OFF
In fact, it would have been syntactically incorrect to include the "CURR" explicitly in the second
command, since the result after combining it with the header path would be:
CURR:CURR:PROT:STAT OFF
which is incorrect.

Moving Among Subsystems
In order to combine commands from different subsystems, you need to be able to reset the header
path to a null string within a message. You do this by beginning the command with a colon (:), which
discards any previous header path. For example, you could clear the output protection and check the
status of the Operation Condition register in one message by using a root specifier as follows:
PROTection:CLEAr; :STATus:OPERation:CONDition?
The following message shows how to combine commands from different subsystems as well as within
the same subsystem:
POWer:LEVel 200; PROTection 28; : CURRent: LEVel 3; PROTection:STATe ON
Observe the use of the optional header LEVel to maintain the correct path within the voltage and
current subsystems, and the use of the root specifier to move between subsystems.
Including Common Commands
You can combine common commands with subsystem commands in the same message. Treat the
common command as a message unit by separating it with a semicolon (the message unit separator).
Common commands do not affect the header path; you may insert them anywhere in the message.
VOLTage 17.5;*TRG
OUTPut OFF;*RCL 2;OUTPut ON
Case Sensitivity
Common commands and SCPI commands are not case sensitive. You can use upper or lower case and
any case combination.
Example:
*RST = *rst
:DATA? = :data?
:SYSTem:PRESet = :system:preset
Long-form and Short-form Versions
A SCPI command word can be sent in its long-form or short-form version. The command subsystem
tables in Chapter 3 provide the long-form version. However, the short-form version is indicated by
upper case characters.
Example:
:SYSTem:PRESet (long-form)
:SYST:PRES (short form)
:SYSTem:PRES (long-form and short-form combination)

Note: Each command word must be in long-form or short-form, and not something in between. For
example, :SYSTe:PRESe is illegal and will generate an error. The command will not be executed.

Using Queries
Observe the following precautions with queries:
 Set up the proper number of variables for the returned data. For example, if you are reading
back a measurement array, you must dimension the array according to the number of
measurements that you have placed in the measurement buffer.
 Read back all the results of a query before sending another command to the electronic load.
Otherwise a Query Interrupted error will occur and the unreturned data will be lost.

2.2 Types of SCPI Messages
There are two types of SCPI messages, program and response.
1) A program message consists of one or more properly formatted SCPI commands sent from
the controller to the electronic load. The message, which may be sent at any time, requests
the electronic load to perform some action.
2) A response message consists of data in a specific SCPI format sent from the electronic load
to the controller. The electronic load sends the message only when commanded by a
program message called a "query."
The following figure illustrates SCPI message structure:

Figure 5 - SCPI Message Structure

Message Unit
The simplest SCPI command is a single message unit consisting of a command header (or keyword)
followed by a message terminator. The message unit may include a parameter after the header. The
parameter can be numeric or a string.

VOLTage 20
Headers
Headers, also referred to as keywords, are instructions recognized by the electronic load. Headers may
be either in the long-form or the short-form. In the long-form, the header is completely spelled out,
such as VOLTAGE, STATUS, and DELAY. In the short form, the header has only the first three or four
letters, such as VOLT, STAT, and DEL.
Query Indicator
Following a header with a question mark turns it into a query.
VOLTage?, CURRent:PROTection?
If a query contains a parameter, place the query indicator at the end of the last header.
CURRent:PROTection? MAX
Message Unit Separator
When two or more message units are combined into a compound message, separate the units with a
semicolon.
STATus:OPERation?;QUEStionable?
Root Specifier
When it precedes the first header of a message unit, the colon becomes the root specifier. It tells the
command parser that this is the root or the top node of the command tree.
Message Terminator
A terminator informs SCPI that it has reached the end of a message. Three permitted message
terminators are:
1. Newline (), which is ASCII decimal 10 or hex 0A.
2. End or identify ().
3. Both of the above ().
In the examples of this guide, there is an assumed message terminator at the end of each message.

Command Execution Rules
 Commands execute in the order that they are presented in the program message.
 An invalid command generates an error and is not executed.
 Valid commands that precede an invalid command in a multiple command program
message are executed.
 Valid commands that follow an invalid command in a multiple command program message
are ignored.

2.3 SCPI Data Formats
All data programmed to or returned from the electronic load is ASCII. The data may be numerical or a
character string.
Numerical Data Formats
Symbol

Data Form
Talking Formats

Digits with an implied decimal point assumed at the right of the least-significant digit.
Example: 273

Digits with an explicit decimal point.
Example: .0273

Digits with an explicit decimal point and an exponent.
Example: 2.73E+2
Listening Formats

Extended format that includes , and .
Example: 273 273. 2.73E2

Expanded decimal format that includes and MIN MAX DEF.
Example: 273 273. 2.73E2 MAX. MIN and MAX are the minimum and maximum limit
values that are implicit in the range specification for the parameter. DEF is the default
values for the parameter.

Boolean Data.
Example: 0 | 1 or ON | OFF

Suffixes and Multipliers
Class

Suffix

Unit

Unit with Multiplier

Amplitude

volt

MV (millivolt)

Current

amps

MA (milliamp)

Power

watt

MW (milliwatt)

Resistance

OHM

ohm

MOHM (megohm)

ohm

MR(megohm)

Slew Rate

A/uS

amps/microsecond

Time

second

MS (millisecond)

Common Multipliers
1E3

kilo

1E-3

milli

1E-6

micro

Response Data Types
Character strings returned by query statements may take either of the following forms, depending on
the length of the returned string:

Character Response Data. Permits the return of character strings.

Arbitrary ASCII Response Data. Permits the return of undelimited 7-bit ASCII. This data
type has an implied message terminator.

String Response Data. Returns string parameters enclosed in double quotes.
Response Messages
A response message is the message sent by the instrument to the computer in response to a query
command program message.
Sending a Response Message
After sending a query command, the response message is placed in the Output Queue. When the
electronic load is then addressed to talk, the response message is sent from the Output Queue to the
computer.
Multiple Response Messages
If you send more than one query command in the same program message (see the paragraph entitled,
“Multiple Command Messages”), the multiple response messages for all the queries is sent to the
computer when the electronic load is addressed to talk. The responses are sent in the order that the
query commands were sent and are separated by semicolons (;). Items within the same query are
separated by commas (,). The following example shows the response message for a program message

that contains four single item query commands:
0; 1; 1; 0
Response Message Terminator (RMT)
Each response is terminated with an LF (line feed) and EOI (end or identify). The following example
shows how a multiple response message is terminated:
0; 1; 1; 0;
Message Exchange Protocol
Two rules summarize the message exchange protocol:
Rule 1. You must always tell the electronic load what to send to the computer.
The following two steps must always be performed to send information from the
computer to the instrument:
1) Send the appropriate query command(s) in a program message.
2) Address the electronic load to talk.
Rule 2. The complete response message must be received by the computer before another
program message can be sent to the electronic load.

2.4 SCPI Command Completion
SCPI commands sent to the electronic load are processed either sequentially or in parallel. Sequential
commands finish execution before a subsequent command begins. Parallel commands allow other
commands to begin executing while the parallel command is still executing. Commands that affect
trigger actions are among the parallel commands.
The *WAI, *OPC, and *OPC? common commands provide different ways of indicating when all
transmitted commands, including any parallel ones, have completed their operations. The syntax and
parameters for these commands are described in Chapter 4. Some practical considerations for using
these commands are as follows:
*WAI

This prevents the electronic load from processing subsequent commands until all pending
operations are completed.

*OPC? This places a 1 in the Output Queue when all pending operations have completed. Since it
requires your program to read the returned value before executing the next program
statement, *OPC? can be used to cause the controller to wait for commands to complete
before proceeding with its program.

*OPC

This sets the OPC status bit when all pending operations have completed. Since your
program can read this status bit on an interrupt basis, *OPC allows subsequent commands
to be executed.

NOTE: The trigger system must be in the Idle state in order for the status OPC bit to be true. Therefore,
as far as triggers are concerned, OPC is false whenever the trigger system is in the Initiated state.

Using Device Clear
You can send a device clear at any time to abort a SCPI command that may be hanging up the GPIB
interface. The status registers, error queue, and all configuration states are left unchanged when a
device clear message is received. Device clear performs the following actions:



The input and output buffers of the electronic load are cleared.
The electronic load is prepared to accept a new command string.

The following statement shows how to send a device clear over the GPIB interface using GW BASIC:
CLEAR 705

IEEE-488 Device Clear

The following statement shows how to send a device clear over the GPIB interface using the GPIB
command library for C or QuickBASIC:
IOCLEAR (705)

Chapter 3
SCPI Commands
This chapter explains in detail the SCPI commands used by the electronic load. The electronic load
conforms to SCPI Version 1995.0.

3.1 Language Dictionary
This section describes the syntax and parameters for all the IEEE 488.2 SCPI subsystem and common
commands used by the electronic loads. Since the SCPI syntax remains the same for all programming
languages, the examples given for each command are generic.

Syntax Forms

Syntax definitions use the long form, but only short form headers (or
"keywords") appear in the examples. Use the long form to help make your
program self-documenting.

Parameters

Most commands require a parameter and all queries will return a parameter.
The range for a parameter may vary according to the model of electronic
load. Parameters for all models are listed in the Specifications table in the
User’s Guide.

Related Commands

Where appropriate, related commands or queries are included. These are
listed because they are either directly related by function, or because reading
about them will clarify or enhance your understanding of the original
command or query.

Order of Presentation

The dictionary is organized as follows:
 Subsystem commands, arranged by subsystem
 IEEE 488.2 common commands

Common Commands
Common commands begin with an * and consist of three letters (command) or three letters and a ?
(query). They are defined by the IEEE 488.2 standard to perform common interface functions. Common
commands and queries are categorized under System, Status, or Trigger functions and are listed at the
end of this chapter.

Subsystem Commands
Subsystem commands are specific to functions. They can be a single command or a group of

commands. The groups are comprised of commands that extend one or more levels below the root.
The subsystem command groups are arranged according to function: Calibration, Input, List,
Measurement, Port, Status, System, Transient, and Trigger. Commands under each function are
grouped alphabetically under the subsystem. Commands followed by a question mark (?) take only the
query form. When commands take both the command and query form, this is noted in the syntax
descriptions.

3.2 Common Commands
Common commands begin with an * and consist of three letters (command) IEEE 488.2 standard to
perform some common interface functions. The electronic loads respond to the required common
commands that control status reporting, synchronization, and internal operations. The electronic loads
also respond to optional common commands that control triggers, power-on conditions, and stored
operating parameters.
Common commands and queries are listed alphabetically. If a command has a corresponding query
that simply returns the data or status specified by the command, then both command and query are
included under the explanation for the command. If a query does not have a corresponding command
or is functionally different from the command, then the query is listed separately. The description for
each common command or query specifies any status registers affected. Refer to 1.4 Programming the
Status Registers, which explains how to read specific register bits and use the information that they
return.
Common Command Table
Mnemonic

Name

*CLS

Clear status

*ESE

Clears all event registers and Error Queue.

Event enable command Program the Standard Event Enable Register.

*ESE?

Event enable query

Read the Standard Event Enable Register.

*ESR?

Event status query

Read the Standard Event Status Register and clear it.

*OPC

Operation complete
command

Common Command Table (cont.)

Description

Set the Operation Complete bit in the Standard Event Status
Register after all pending commands have been executed.

Mnemonic

Name

*OPC?

Operation complete
query

*RCL

Recall command

Returns the electronic load to the setup configuration
stored in the specified memory location.

*RST

Reset command

Returns the electronic load to the *RST default
conditions.

*SAV

Save command

Saves the current setup to the specified memory
location.

*SRE
*SRE?

Service request enable
command
Service request enable
query

Description
Places an ASCII “1” into the output queue when all
pending selected device operations have been
completed.

Programs the Service Request Enable register.
Reads the Service Request Enable register.

*STB?

Read status byte query

Read the Status Byte register

*TRG

Trigger command

*TST?

Self-test query

Wait until all previous commands are executed.

*WAI

Wait to continue
command

Wait until all previous commands are executed.

*RDT?

Frame query

*IDN?

Identification query

Send a trigger to the electronic load.

Return the type of electronic frame.
Return the manufacturer, model number, serial number,
and firmware revision levels of the unit.

*CLS — Clear Status
This command clears the bits of the following registers:
 Standard Event Status
 Operation Status Event
 Questionable Status Event
 Status Byte
 Error Queue
Command Syntax *CLS
Parameters None

*ESE — Event Enable
This command programs the Standard Event Status Enable register bits. The programming determines
which events of the Standard Event Status Event Register (see *ESR?) are allowed to set the ESB (Event
Summary Bit) of the Status Byte register. A "1" in the bit position enables the corresponding event. All
of the enabled events of the Standard Event Status Event register are logically ORed to cause the Event
Summary Bit (ESB) of the Status Byte Register to be set. See 1.4 Programming the Status Registers for
descriptions of the Standard Event Status registers. The query reads the Standard Event Status Enable
register.
Command Syntax
Parameters
Power-On Value
Example
Query Syntax
Returned Parameters
Related Commands

*ESE
0 to 255
See *PSC
*ESE 129
*ESE?

*ESR? *PSC *STB?

*ESR?
This query reads the Standard Event Status register. Reading the register clears it. The bit configuration
of this register is the same as the Standard Event Status Enable register (see *ESE). See 1.4
Programming the Status Registers for a detailed explanation of this register.
Query Syntax
Parameters
Returned Parameters
Related Commands

*ESR?
None
(register value)
*CLS *ESE *ESE? *OPC

*IDN?
This query requests the electronic load to identify itself. It returns the data in four fields separated by
commas.
Query Syntax *IDN?
Parameters None
Returned Parameters

Field
Information
B&K Precision
manufacturer
xxxxxx
model number
xxxxxxxxxxxxxxxxxx serial number or 0
x.xx
firmware revision
Example: B&K PRECISION, 8600, 600150010677510002, 1.32-1.37

*OPC
This command causes the interface to set the OPC bit (bit 0) of the Standard Event Status register
when the electronic load has completed all pending operations. (See *ESE command for the bit
configuration of the Standard Event Status registers.) Pending operations are complete when:




All commands sent before *OPC have been executed. This includes overlapped commands.
Most commands are sequential and are completed before the next command is executed.
Overlapped commands are executed in parallel with other commands. Commands that
affect trigger actions are overlapped with subsequent commands sent to the electronic
load. The *OPC command provides notification that all overlapped commands have been
completed.
All triggered actions are completed and the trigger system returns to the Idle state.

*OPC does not prevent processing of subsequent commands but bit 0 will not be set until all pending
operations are completed. The query causes the interface to place an ASCII "1" in the Output Queue
when all pending operations are completed.
Command Syntax
Parameters
Query Syntax
Returned Parameters
Related Commands

*OPC
None
*OPC?

*TRIG *WAI

*RCL
This command restores the electronic load to a state that was previously stored in memory with a
*SAV command to the specified location. All states are recalled with the following exceptions:
 CAL:STATe is set to OFF
 The trigger system is set to the Idle state by an implied ABORt command (this cancels any
incomplete trigger actions)
NOTE: The device state stored in location 0 is automatically recalled at power turn-on.

Command Syntax
Parameters
Example
Related Commands

*RCL
0 to 9
*RCL3
*PSC *RST *SAV

*RST
This command resets the electronic load to the following factory-defined states:
CURR
CURR:MODE
CURR:PROT:DEL
CURR:PROT:LEV
CURR:PROT:STAT
CURR:RANG
CURR:SLEW
CURR:TRAN:ALEV
CURR:TRAN:AWID
CURR:TRAN:BLEV
CURR:TRAN:BWID
CURR:TRAN:MODE
FUNC
FUNC:MODE
INP
INP:SHOR
POW:CONF
POW:PROT:DEL
RES
RES:RANG
RES:TRAN:ALEV

MIN
FIX
3
MAX
OFF
MAX
MAX
MAX
MIN
MIN
MIN
CONT
CURR

RES:TRAN:BLEV
RES:TRAN:BWID
RES:TRAN:MODE
SENS:AVER:COUN
SENS:AVER:STAT

MIN
MIN
CONT
8
1

SENS:FUNC:CURR
SENS:NPLC
SENS:VOLT:RANG:AUTO
TRAC:FEED
TRAC:FEED:MODE
TRAC:POIN
TRAN
TRIG:COUN

DC
7
ON
TWO
NEV
2
OFF
1

TRIG:DEL
VOLT
VOLT:ON
VOLT:ON:LATC
VOLT:RANG
VOLT:TRAN:ALEV
VOLT:TRAN:AWID
VOLT:TRAN:BWID

0
MAX
MIN
ON
MAX
MAX
MIN
MIN

FIX
OFF
OFF
MAX
3
MAX
MAX
MAX

RES:TRAN:AWID MIN

VOLT:TRAN:MODE CONT

NOTE:
 *RST does not clear any of the status registers or the error queue, and does not affect any
interface error conditions.
 *RST sets the trigger system to the Idle state.
 *RST clears the presently active list.

Command Syntax *RST
Parameters None
Related Commands *PSC *SAV

*SAV
This command stores the present state of the electronic load to a specified location in memory. Up to
101 states can be stored.
If a particular state is desired at power-on, it should be stored in location 0. It will then be recalled at
power-on if the power-on state is set to RCL0. Use *RCL to retrieve instrument states.
Command Syntax
Parameters
Example
Related Commands

*SAV
0 to 100
*SAV 3
*PSC *RST *RCL

*SRE
This command sets the condition of the Service Request Enable register. This register determines
which bits from the Status Byte Register (see *STB for its bit configuration) are allowed to set the
Master Status Summary (MSS) bit and the Request for Service (RQS) summary bit. A 1 in any Service
Request Enable register bit position enables the corresponding Status Byte register bit and all such
enabled bits are then logically ORed to cause Bit 6 of the Status Byte Register to be set.
When the controller conducts a serial poll in response to SRQ, the RQS bit is cleared, but the MSS bit is
not. When *SRE is cleared (by programming it with 0), the electronic load cannot generate an SRQ to
the controller. The query returns the current state of *SRE.
Command Syntax
Parameters
Default Value
Example
Query Syntax
Returned Parameters
Related Commands

*SRE
0 to 255
See *PSC
*SRE 128
*SRE?
(register binary value)
*ESE *ESR *PSC

*STB?
This query reads the Status Byte register, which contains the status summary bits and the Output
Queue MAV bit. Reading the Status Byte register does not clear it. The input summary bits are cleared
when the appropriate event registers are read (see 1.4 Programming the Status Registers for more
information). A serial poll also returns the value of the Status Byte register, except that bit 6 returns
Request for Service (RQS) instead of Master Status Summary (MSS). A serial poll clears RQS, but not
MSS. When MSS is set, it indicates that the electronic load has one or more reasons for requesting
service.
Query Syntax *STB?
Parameters None
Returned Parameters (register value)

Related Commands *SRE *ESR *ESE

*TRG
This command generates a trigger to any system that has BUS selected as its source (for example,
TRIG:SOUR BUS). The command has the same effect as the Group Execute Trigger () command.
Command Syntax *TRG
Parameters None
Related Commands ABOR INIT TRIG:IMM

*TST?
This query causes the electronic load to do a self-test and report any errors.
Query Syntax TST?
Parameters None
Related Commands

0 indicates the electronic load has passed selftest. Non-zero indicates an error code.

*WAI
This command instructs the electronic load not to process any further commands until all pending
operations are completed. Pending operations are complete when:




All commands sent before *WAI have been executed. This includes overlapped commands.
Most commands are sequential and are completed before the next command is executed.
Overlapped commands are executed in parallel with other commands. Commands that affect
input voltage or state, relays, and trigger actions are overlapped with subsequent commands
sent to the electronic load. The *WAI command prevents subsequent commands from being
executed before any overlapped commands have been completed.
All triggered actions are completed and the trigger system returns to the Idle state.

*WAI can be aborted only by sending the electronic load a GPIB DCL (Device Clear) command.
Command Syntax WAI?
Parameters None
Related Commands *OPC

3.3 Subsystem Commands
The following is a list of the SCPI subsystem commands and the table number where each command is
summarized.










Trigger Commands
System Commands
Status Commands
Trace Commands
Source Commands
List Commands
Measure Commands
Sense Commands
Calibrate Commands

General notes:
 Brackets ([ ]) are used to denote optional character sets. These optional characters do not have
to be included in the program message. Do not use brackets in the program message.
 Angle brackets (< >) are used to indicate parameter type. Do not use angle brackets in the
program message.
 The Boolean parameter () is used to enable or disable an instrument operation. 1 or ON
enables the operation and 0 or OFF disables the operation.
 Upper case characters indicate the short-form version for each command word.
 Default Parameter — Listed parameters are both the *RST and :SYSTem:PRESet defaults, unless
noted otherwise. Parameter notes are located at the end of each table.

Trigger Commands
The trigger subsystem is made up of a series of commands and subsystems to configure the trigger
model.

TRIGger:SOURce
This command selects the trigger source.

BUS

Accepts a GPIB signal or a *TRG command as the trigger source. This
selection guarantees that all previous commands are complete before the trigger
occurs.

EXTernal

Selects the electronic load’s trigger input as the trigger source. This trigger is
processed as soon as it is received.

HOLD

Only the TRIG:IMM command will generate a trigger in HOLD mode. All other
trigger commands are ignored.

MANUal
TIMer

The event occurs when the Trig key is pressed.
This generates triggers that are in synchronization with the electronic load's
internal oscillator as the trigger source. The internal oscillator begins running as
soon as this command is executed. Use TRIG:TIM to program the oscillator period.
Command Syntax
Parameters
*RST Value
Examples
Query Syntax
Returned Parameters
Related Commands

TRIGger:SOURce
BUS | EXTernal | HOLD | MANUal | TIMer
MANUal
TRIG:SOUR BUS TRIG:SOUR EXT
TRIGger:SOURce?

ABOR TRIG TRIG:DEL

TRIGger:TIMer
This command specifies the period of the triggers generated by the internal trigger generator.
Command Syntax
Parameters
Unit
*RST Value
Examples
Query Syntax
Returned Parameters
Related Commands

ABOR TRIG TRIG:SOUR TRIG:DEL

System Commands
System commands control the system-level functions of the electronic load that are not directly
related to input control or measurement functions.

SYSTem:PRESet
This command returns the instrument to states optimized for front panel operation.
Command Syntax SYSTem:PRESet
Parameters None

SYSTem:POSetup
This command is used to select the power-on defaults. With RST selected, the instrument powers up to
the *RST default conditions. With the SAV0 parameter selected, the instrument powers-on to the
setup that is saved in the specified location using the *SAV command.
Command Syntax
Parameters
*RST Value
Examples
Query Syntax
Returned Parameters
Related Commands

SYSTem:POSetup
RST | SAV0
RST
SYST:POS RST
SYSTem:POSetup?

*RST *SAV

SYSTem:VERSion?
This query returns the SCPI version number to which the electronic load complies. The value is of the
form YYYY.V, where YYYY is the year and V is the revision number for that year.
Query Syntax
Parameters
Examples
Returned Parameters

SYSTem:VERSion?
None
SYST:VERS?

SYSTem:ERRor?
This query returns the next error number followed by its corresponding error message string from the
remote programming error queue. The queue is a FIFO (first-in, first-out) buffer that stores errors as
they occur. As it is read, each error is removed from the queue. When all errors have been read, the
query returns “0, No Error”. If more errors are accumulated than the queue can hold, the last error in
the queue is “-350, Too Many Errors”.
Query Syntax
Parameters
Examples
Returned Parameters

SYSTem:ERRor?
None
SYST:ERR?
,

SYSTem:CLEar
This action command is used to clear the Error Queue of messages.
Command Syntax
Parameters
Examples
Related Commands

SYSTem:CLEar
None
SYST:CLE
SYST:ERR?

SYSTem:LOCal
This command places the electronic load in local mode during RS-232 operation. The front panel keys
are functional.
Command Syntax
Parameters
Examples
Related Commands

SYSTem:LOCal
None
SYST:LOC
SYST:REM SYST:RWL

SYSTem:REMote
This command places the electronic load in remote mode during RS-232 operation. This disables all
front panel keys except the Local key. Pressing the Local key while in the remote state returns the front
panel to the local state.
Command Syntax
Parameters
Examples
Related Commands

SYSTem:REMote
None
SYST:REM
SYST:LOC SYST:RWL

SYSTem:RWLock
This command places the electronic load in remote mode during RS-232 operation. All front panel keys
including the Local key are disabled. Use SYSTem:LOCal to return the front panel to the local state.
Command Syntax
Parameters
Examples
Related Commands

SYSTem:RWLock
None
SYST:RWL
SYST:REM SYST:LOC

Status Commands
These commands program the electronic load’s status registers. The electronic load has five groups of
status registers:
1. Questionable Status
2. Standard Event Status
3. Operation Status
Refer to 1.4 Programming the Status Registers for more information.

STATus:OPERation?
This query returns the value of the Operation Event register. The Event register is a read-only register
that holds (latches) all events that are passed by the Operation NTR and/or PTR filter. Reading the
Operation Event register clears it.
Query Syntax STATus:OPERation[:EVENt]?
Parameters None
Examples STAT:OPER:EVEN?
Returned Parameters (register value)
Related Commands *CLS

STATus:OPERation:CONDition?
This query returns the value of the Operation Condition register. This is a read-only register that holds
the real-time (unlatched) operational status of the electronic load.
Query Syntax
Parameters
Examples
Returned Parameters
Related Commands

STATus:OPERation:CONDition?
None
STAT:OPER:COND?
(register value)
STAT:QUES:COND?

STATus:OPERation:ENABle
This command and its query can be used to set and read the value of the Operation Enable register.
This register is a mask for enabling specific bits from the Operation Event register to set the operation
summary bit (OPER) of the Status Byte register. The operation summary bit is the logical OR of all
enabled Operation Event register bits.
Command Syntax
Parameters
Default Value
Examples
Query Syntax
Returned Parameters
Related Commands

STATus:OPERation:ENABle
0 to 65535
0
STAT:OPER:ENAB 32 STAT:OPER:ENAB 1
STATus:OPERation:ENABle?
(register value)
STAT:OPER?

STATus:QUEStionable?
This query returns the value of the Questionable Event register. The Event register is a read-only
register that holds (latches) all events that pass into it. Reading the Questionable Event register clears
it.
Query Syntax
Parameters
Examples
Returned Parameters

STATus:QUEStionable[:EVENt]?
None
STAT:QUES:EVEN?
(register value)

STATus:QUEStionable:CONDition?
This query returns the value of the Questionable Condition register. This is a read-only register that
holds the real-time (unlatched) questionable status of the electronic load.
Query Syntax
Parameters
Examples
Returned Parameters
Related Commands

STATus:QUEStionable:ENABle

STATus:QUEStionable:CONDition?
None
STAT:QUES:COND?
(register value)
STAT:OPER:COND?

This command sets or reads the value of the Questionable Enable register. This register is a mask for
enabling specific bits from the Questionable Event register to set the questionable summary (QUES) bit
of the Status Byte register. This bit (bit 3) is the logical OR of all the Questionable Event register bits
that are enabled by the Questionable Status Enable register.
Command Syntax
Parameters
Default Value
Examples
Query Syntax
Returned Parameters
Related Commands

STATus:QUEStionable:ENABle
0 to 65535
0
STAT:QUES:ENAB 32 STAT:QUES:ENAB 1
STATus:QUEStionable:ENABle?
(register value)
STAT:QUES?

STATus:PRESet
When this command is sent, the SCPI event registers are affected as follows: All bits of the following
registers are cleared to zero (0):
 Questionable Event Enable Register
 Operation Event Enable Register

NOTE: Registers not included in the list above are not affected by this command.

Command Syntax STATus:PRESet
Parameters None
Examples STAT:PRES

Trace Commands
The commands in this subsystem are used to configure and control data storage into the buffer.

TRACe:CLEar

This action command is used to clear the buffer of readings. If you do not clear the buffer, a
subsequent store will overwrite the old readings. If the subsequent store is aborted before the buffer
becomes full, you could end up with some “old” readings still in the buffer.
Command Syntax TRACe:CLEar
Parameters None
Example TRAC:CLE

TRACe:FREE?
This command is used to read the status of storage memory. After sending this command and
addressing the electronic load to talk, two values separated by commas are sent to the computer. The
first value indicates how many bytes of memory are available, and the second value indicates how
many bytes are reserved to store readings.
Query Syntax TRACe:FREE?
Returned Parameters ,
Examples TRAC:FREE?

TRACe:POINts
This command is used to specify the size of the buffer.
Command Syntax
Parameters
*RST Value
Examples
Query Syntax
Returned Parameters
Related Commands

TRAC:FEED

TRACe:FEED
This command is used to select the source of readings to be placed in the buffer. With VOLTage
selected, voltage readings are placed in the buffer (TRAC:POIN maximum value is 2000). With CURRent
selected, current readings are placed in the buffer (TRAC:POIN maximum value is 2000). With TWO
selected, voltage and current are placed in the buffer when storage is performed (TRAC:POIN
maximum value is 100).
Command Syntax TRACe:FEED

Parameters
*RST Value
Examples
Query Syntax
Returned Parameters
Related Commands

VOLTage | CURRent | TWO
TWO
TRAC:FEED VOLT
TRACe:FEED?

TRAC:POIN

TRACe:FEED:CONTrol
This command is used to select the buffer control. With NEVer selected, storage into the buffer is
disabled. When NEXT is selected, the storage process starts, fills the buffer and then stops. The buffer
size is specified by the :POINts command.
Command Syntax
Parameters
*RST Value
Examples
Query Syntax
Returned Parameters
Related Commands

TRACe:FEED:CONTrol
NEVer | NEXT
NEVer
TRAC:FEED:CONT NEXT
TRACe: FEED:CONT?

TRAC:FEED

TRACe:DATA?
When this command is sent and the electronic load is addressed to talk, all the readings stored in the
buffer are sent to the computer.
Query Syntax TRACe:DATA?
Returned Parameters {, …etc,} or { ,
…etc} (if TRACe:FEED TWO is set)

TRACe:FILTer
This command is used to select whether the data in buffer is filtered data.
Command Syntax TRACe:FILTer[:STATe]
Parameters 0 | 1 | ON | OFF
*RST Value OFF

Examples TRAC:FILT 1
Query Syntax TRACe:FILTer[:STATe]?
Returned Parameters

TRACe:DELay
This command is used to select the delay time for trigger in buffer.
Command Syntax
Parameters
Unit
*RST Value
Examples
Query Syntax
Returned Parameters

TRACe:TIMer
This command is used to select the interval for timer.
Command Syntax
Parameters
Unit
*RST Value
Examples
Query Syntax
Returned Parameters

Source Commands
These commands control the input of the electronic load. The INPut and OUTput commands are
equivalent. The CURRent, RESistance, and VOLTage commands program the actual input current,
resistance, and voltage.

[SOURce:]INPut

Command Syntax
Parameters
*RST Value
Examples
Query Syntax
Returned Parameters
Related Commands

[SOURce:]INPut[:STATe]
0 | 1 | OFF | ON
OFF
INP 1
INPut[:STATe]?
0|1
*RCL *SAV

[SOURce:]INPut:SHORt
Command Syntax
Parameters
*RST Value
Examples
Query Syntax
Returned Parameters
Related Commands

[SOURce:]INPut:SHORt[:STATe]
0 | 1 | OFF | ON
OFF
INP:SHOR 1
INPut:SHORt:STATe?
0|1
INP

[SOURce:]REMote:SENSe
This command is used to select the remote measure mode for the load.
Command Syntax
Parameters
*RST Value
Examples
Query Syntax
Returned Parameters

[SOURce:]REMote:SENSe[:STATe]
0 | 1 | OFF | ON
0
REM:SENS 0
[SOURce:]REMote:SENSe[:STATe]?

[SOURce:]FUNCtion
This command selects the input regulation mode of the electronic load.
CURRent
RESistance
VOLTage
POWer

constant current mode
constant resistance mode
constant voltage mode
constant power mode

Command Syntax
Parameters
*RST Value
Examples
Query Syntax
Returned Parameters

[SOURce:] FUNCtion
CURRent | RESistance | VOLTage | POWer |
CURRent
FUNC RES
[SOURce:]FUNCtion?

[SOURce:]FUNCtion:MODE
This command determines whether the input regulation mode is controlled by values in a list or by the
FUNCtion command setting.
FIXed
LIST

The regulation mode is determined by the FUNCtion or MODE command.
The regulation mode is determined by the active list.
Command Syntax
Parameters
*RST Value
Examples
Query Syntax
Returned Parameters
Related Commands

[SOURce:]FUNCtion:MODE
FIXed | LIST
FIXed
FUNC:MODE FIX
[SOURce:]FUNCtion:MODE?

FUNC

[SOURce:]TRANsient
This command turns the transient generator on or off.
Command Syntax
Parameters
*RST Value
Examples
Query Syntax
Returned Parameters
Related Commands

[SOURce:]TRANsient[:STATe]
0 | 1 | OFF | ON
OFF
TRAN 1
[SOURce:]TRANsient[:STATe]?
0|1
CURR:TRAN:CURR:MODE CURR:TRAN:ALEV

[SOURce:]PROTection:CLEar
This command clears the latch that disables the input when a protection condition such as overvoltage
(OV) or overcurrent (OC) is detected. All conditions that generated the fault must be removed before
the latch can be cleared. The input is then restored to the state it was in before the fault condition
occurred.

Command Syntax [SOURce:]PROTection:CLEar
Parameters None
Examples :PROT:CLE

[SOURce:]INPut:TIMer
These commands enable or disable the electronic load on timer.
Command Syntax
Parameters
*RST Value
Examples
Query Syntax
Returned Parameters
Related Commands

[SOURce:]INPut:TIMer[:STATe]
0 | 1 | OFF | ON
OFF
INP:TIM 1
INPut:TIMer[:STATe]?
0|1
INP:TIM:DEL

[SOURce:]INPut:TIMer:DELay
This command specifies the timer setting.
Command Syntax
Parameters
Unit
*RST Value
Examples
Query Syntax

[SOURce:]CURRent
This command sets the current that the load will regulate when operating in constant current mode.
Command Syntax
Parameters
Unit
*RST Value
Examples
Query Syntax
Returned Parameters
Related Commands

[SOURce:]CURRent[:LEVel][:IMMediate]
0 through max rated current
A (amps)
MINimum
CURR 5 CURR:LEV 0.5
[SOURce:]CURRent[:LEVel][:IMMediate]?

CURR:RANG

[SOURce:]CURRent:RANGe
This command sets the current range of the electronic load module. There are two current ranges, high
range (model dependent) and low range (model dependent).
When you program a range value, the load automatically selects the range that corresponds to the
value that you program. If the value falls in a region where ranges overlap, the electronic load selects
the range with the highest resolution.

NOTE: When this command is executed, the IMMediate, TRANsient, TRIGgered, and SLEW current
settings are adjusted as follows.
 If existing settings are within new range, no adjustment is made.
 If existing settings are outside new range, the levels are set to the maximum value of the new
range.

Command Syntax
Parameters
Unit
*RST Value
Examples
Query Syntax
Returned Parameters
Related Commands

[SOURce:]CURRent:RANGe
0 through max. Rated current
A (amps)
max. current (high range)
SOUR:CURR:RANGE 5
[SOURce:]CURRent:RANGe

CURR CURR:SLEW

[SOURce:]CURRent:SLEW
This command sets the slew rate for all programmed changes in the input current level of the
electronic load. This command programs both positive and negative slew rates. MAXimum sets the
slew to the fastest possible rate. MINimum sets the slew to the slowest rate.
Command Syntax
Parameters
Unit
Examples
Related Commands

[SOURce:]CURRent:SLEW[:BOTH]
See specifications
A (amps per micro second)
CURR:SLEW MAX
CURR CURR:NEG CURR:SLEW:POS

[SOURce:]CURRent:SLEW:POSitive
This command sets the slew rate of the current for positive transitions. MAXimum sets the slew to the
fastest possible rate. MINimum sets the slew to the slowest rate.

Command Syntax
Parameters
Unit
Examples
Query Syntax
Returned Parameters
Related Commands

[SOURce:]CURRent:SLEW:POSitive
See specifications
A (amps per micro second)
CURR:SLEW:POS 0.0001
[SOURce:]CURRent:SLEW:POSitive?

CURR:SLEW

[SOURce:]CURRent:SLEW:NEGative
This command sets the slew rate of the current for negative transitions. MAXimum sets the slew to the
fastest possible rate. MINimum sets the slew to the slowest rate.
Command Syntax
Parameters
Unit
Examples
Query Syntax
Returned Parameters
Related Commands

[SOURce:]CURRent:SLEW:NEGative
see specifications
A (amps per micro second)
CURR:SLEW:NEG 0.0001
[SOURce:]CURRent:SLEW:NEGative?

CURR:SLEW

[SOURce:]CURRent:PROTection:STATe
This command enables or disables the overcurrent protection feature.
Command Syntax
Parameters
*RST Value
Examples
Query Syntax
Returned Parameters
Related Commands

[SOURce:]CURRent:PROTection:STATe
0 | 1 | OFF | ON
OFF
CURR:PROT:STAT 1
[SOURce:]CURRent:PROTection:STATe?

CURR:PROT

[SOURce:]CURRent:PROTection

This command sets the soft current protection level. If the input current exceeds the soft current
protection level for the time specified by CURR:PROT:DEL, the input is turned off.

NOTE: Use CURR:PROT:DEL to prevent momentary current limit conditions caused by programmed
changes from tripping the overcurrent protection.

Command Syntax
Parameters
Unit
Examples
Query Syntax
Returned Parameters
Related Commands

[SOURce:]CURRent:PROTection:LEVel
0 through max. Rated current
A (amps)
CURR:PROT 2
[SOURce:]CURRent:PROTection:LEVel?

CURR:PROT:DEL CURR:PROT:STAT

[SOURce:]CURRent:PROTection:DELay
This command specifies the time that the input current can exceed the protection level before the
input is turned off.
Command Syntax [SOURce:]CURRent:PROTection[:DELay]
Parameters 0 to 60 seconds
Unit seconds
*RST Value 0
Examples CURR:PROT:DEL 5
Query Syntax [SOURce:]CURRent:PROTection:DELay?
Returned Parameters
Related Commands CURR:PROT CURR:PROT:STAT

[SOURce:]CURRent:TRANsient:MODE
This command selects the operating mode of the transient generator as follows in constant current
mode.
CONTinuous The transient generator puts out a continuous pulse stream after receipt of a trigger.
PULSe
The transient generator puts out a single pulse upon receipt of a trigger.
TOGGle
The transient generator toggles between two levels upon receipt of a trigger.
Command Syntax [SOURce:]CURRent:TRANsient:MODE
Parameters CONTinuous | PULSe | TOGGle
*RST Value CONTinuous

Examples
Query Syntax
Returned Parameters
Related Commands

CURR:TRAN:MODE TOGG
[SOURce:]CURRent:TRANsient:MODE?

CURR:TRAN:ALEV TRAN

[SOURce:]CURRent:TRANsient:ALEVel
[SOURce:]CURRent:TRANsient:BLEVel
These commands specify the transient level of the input current. The transient function switches
between level A and level B.
Command Syntax [SOURce:]CURRent:TRANsient:ALEVel
[SOURce:]CURRent:TRANsient:BLEVel
Parameters 0 through max. Rated current
Unit A (amps)
Examples CURR:TRAN:ALEV 5 CURR:TRAN:BLEV 0.5
Query Syntax [SOURce:]CURRent:TRANsient:ALEVel?
[SOURce:]CURRent:TRANsient:BLEVel
Returned Parameters
Related Commands CURR:

[SOURce:]CURRent:TRANsient:AWIDth
[SOURce:]CURRent:TRANsient:BWIDth
These commands specify the transient pulse width of the input current.
The command takes 2 parameters, first is the time and second is the unit. Both the time and the units
must be specified.
The numbers permitted also need to follow the following:
Milliseconds with up to 5 decimal places (6 digits total)
Seconds with up to 5 decimal places (6 digits total)
Note: For Continuous, Frequency is 1/ (Awid+Bwid) and Duty is Awid / (Awid+Bwid)
For pulse, pulse width = Awid

Command Syntax [SOURce:]CURRent:TRANsient:AWIDth
[SOURce:]CURRent:TRANsient:BWIDth
Parameters 20 uS to 3600 S, units (uS, mS or S)
Unit S (seconds) mS (milliseconds) uS (microseconds)
*RST Value 500uS
Examples CURR:TRAN:AWID 100 uS
CURR:transient bwidth 13.12345 uS
current:transient:awidth 3125.12 S (Seconds with up to 2
decimal places)

Query Syntax [SOURce:]CURRent:TRANsient:AWIDth?
[SOURce:]CURRent:TRANsient:BWIDth
Returned Parameters
Related Commands CURR:

[SOURce:]CURRent:HIGH
[SOURce:]CURRent:LOW
These commands set the high and low voltage level when the load is in constant current mode.
Command Syntax [SOURce:]CURRent:HIGH
[SOURce:]CURRent:LOW
Parameters see specifications for voltage range
Unit V (volts)
Examples CURR:HIGH 5
Query Syntax [SOURce:]CURRent:HIGH? [SOURce:]CURRent:LOW?
Returned Parameters

[SOURce:]VOLTage
This command sets the voltage that the electronic load will regulate when operating in constant
voltage (CV) mode.
Command Syntax
Parameters
Unit
Examples
Query Syntax
Returned Parameters
Related Commands

[SOURce:]VOLTage[:LEVel][:IMMediate]
See specifications for range
V (volts)
VOLT 5
[SOURce:]VOLTage[:LEVel][:IMMediate]?

VOLT:RANG

[SOURce:]VOLTage:RANGe
This command sets the voltage range of the electronic load module. There is only one voltage range.
Command Syntax
Parameters
Unit
Examples

[SOURce:] VOLTage:RANGe
see specifications for range
V (volts)
VOLT:RANG 15

Query Syntax [SOURce:]VOLTage:RANGe?
Returned Parameters
Related Commands VOLT

VOLTage:RANGe:AUTO
This command sets the voltage auto range state of the electronic load module.
Command Syntax
Parameters
*RST Value
Examples
Query Syntax
Returned Parameters

[SOURce:]VOLTage:RANGe:AUTO
0 | 1 | ON | OFF
1
VOLT:RANG:AUTO 1
[SOURce:]VOLTage:RANGe:AUTO?

[SOURce:]VOLTage:ON
This command sets the voltage of sink current on.
Command Syntax
Parameters
Unit
Examples
Query Syntax
Returned Parameters
Related Commands

[SOURce:]VOLTage[:LEVel]:ON
0 through max. rated voltage.
V (volts)
VOLT 5
[SOURce:]VOLTage[:LEVel]:ON?

VOLT:LATCh

[SOURce:]VOLTage:LATCh
This command sets the action type of Von.
Command Syntax
Parameters
*RST Value
Examples
Query Syntax
Returned Parameters
Related Commands

[SOURce:]VOLTage:LATCh[:STATe]
0 | 1 | ON | OFF
ON
VOLT:LATC 1
[SOURce:] VOLTage:LATCh[:STATe]?
0|1
VOLT:ON

[SOURce:]VOLTage:HIGH

[SOURce:]VOLTage:LOW
These commands set the high and low current limit when the load is in constant voltage mode.
Command Syntax [SOURce:]VOLTage:HIGH
[SOURce:]VOLTage:LOW
Parameters 0 to max. rated current.
Unit A (amps)
Examples VOLT:HIGH 5
Query Syntax [SOURce:]VOLTage:HIGH?
[SOURce:]VOLTage:LOW?

[SOURce:]VOLTage:TRANsient:MODE
This command selects the operating mode of the transient generator as follows in constant voltage
mode.
CONTinuous The transient generator puts out a continuous pulse stream after receipt of a trigger.
PULSe
The transient generator puts out a single pulse upon receipt of a trigger.
TOGGle
The transient generator toggles between two levels upon receipt of a trigger.
Command Syntax
Parameters
*RST Value
Examples
Query Syntax
Returned Parameters
Related Commands

[SOURce:]VOLTage:TRANsient:MODE
CONTinuous | PULSe | TOGGle
CONTinuous
VOLT:TRAN:MODE PULS
[SOURce:] VOLTage:TRANsient:MODE?

VOLT:TRAN:ALEV TRAN

[SOURce:]VOLTage:TRANsient:ALEVel
[SOURce:]VOLTage:TRANsient:BLEVel
These commands specify the transient level of the input voltage. The transient function switches
between level A and level B.
Command Syntax [SOURce:]VOLTage:TRANsient:ALEVel
[SOURce:]VOLTage:TRANsient:BLEVel
Parameters 0 to max. rated voltage
Unit V (volts)
Examples VOLT:TRAN:ALEV 5 VOLT:TRAN:BLEV 0.5
Query Syntax [SOURce:]VOLTage:TRANsient:ALEVel?
[SOURce:]VOLTage:TRANsient:BLEVel?

Returned Parameters
Related Commands VOLT

[SOURce:]VOLTage:TRANsient:AWIDth
[SOURce:]VOLTage:TRANsient:BWIDth
This command specifies the transient pulse width of the input voltage.
The command takes 2 parameters, first is the time and second is the unit. Both the time and the units
must be specified.
Command Syntax [SOURce:]VOLTage:TRANsient:AWIDth
[SOURce:]VOLTage:TRANsient:BWIDth
Parameters 100 uS to 3600 S
Unit S (seconds), mS (milliseconds), or uS (microseconds)
*RST Value 500uS
Examples VOLT:TRAN:AWID 0.001 S
VOLT:TRAN:BWID 0.1 mS
Query Syntax [SOURce:] VOLTage:TRANsient:AWIDth?
[SOURce:]VOLTage:TRANsient:BWIDth?
Returned Parameters
Related Commands VOLT

[SOURce:]RESistance
This command sets the resistance of the electronic load when operating in constant resistance mode.
Command Syntax
Parameters
Unit
Examples
Query Syntax
Returned Parameters
Related Commands

[SOURce:]RESistance[:LEVel][:IMMediate]
0 to max. rated resistance
Ω (ohms)
RES 5 RES:LEV 3.5
[SOURce:]RESistance[:LEVel][:IMMediate]?

RES:RANG

[SOURce:]RESistance: RANGe
This command sets the resistance range of the electronic load module. This limits the value the
resistance can be set to.
When you program a range value, the electronic load automatically selects the range that corresponds
to the value that you program. If the value falls in a region where ranges overlap, the electronic load

selects the range with the highest resolution.
NOTE: When this command is executed, the IMMediate, TRANsient, TRIGgered, and SLEW resistance
settings are adjusted as follows.
If existing settings are within new range, no adjustment is made.
If existing settings are outside new range, the levels are set to either the maximum or minimum value
of the new range, depending on which they are closest to.

Command Syntax
Parameters
Unit
Examples
Query Syntax
Returned Parameters
Related Commands

[SOURce:]RESistance:RANGe
0 to max. rated resistance
Ω (ohms)
RES:RANG 15 SOUR:RES:RANGE 20
[SOURce:]RESistance:RANGe?

RES RES:SLEW

[SOURce:]RESistance:HIGH
[SOURce:]RESistance:LOW
This command is used to set the voltage high and low limit determined when the load is in constant
resistance mode.
Command Syntax [SOURce:]RESistance:HIGH
[SOURce:]RESistance:LOW
Parameters 0 to max. rated voltage
Unit V (volts)
Examples RES:HIGH 5
Query Syntax [SOURce:]RESistance:HIGH?
[SOURce:]RESistance:LOW?
Returned Parameters

[SOURce:]RESistance:TRANsient:MODE
This command selects the operating mode of the transient generator as follows in constant resistance
mode.
CONTinuous The transient generator puts out a continuous pulse stream upon receipt of a trigger.
PULSe
The transient generator puts out a single pulse upon receipt of a trigger.
TOGGle
The transient generator toggles between two levels upon receipt of a trigger.
Command Syntax
Parameters
*RST Value
Examples
Query Syntax
Returned Parameters
Related Commands

[SOURce:]RESistance:TRANsient:MODE
CONTinuous | PULSe | TOGGle
CONTinuous
RES:TRAN:MODE PULS
[SOURce:]RESistance:TRANsient:MODE?

RES:TRAN:ALEV TRAN

[SOURce:]RESistance:TRANsient:ALEVel
[SOURce:]RESistance:TRANsient:BLEVel
This command specifies the transient level of the input resistance. The transient function switches
between level A and level B.
Command Syntax [SOURce:]RESistance:TRANsient:ALEVel
[SOURce:]RESistance:TRANsient:BLEVel
Parameters 0 to max. rated resistance.
Unit Ω (ohms)
Examples RES:TRAN:ALEV 5 RES:TRAN:BLEV 0.5
Query Syntax [SOURce:]RESistance:TRANsient:ALEVel?
[SOURce:]RESistance:TRANsient:BLEVel?
Returned Parameters
Related Commands RES

[SOURce:]RESistance:TRANsient:AWIDth
[SOURce:]RESistance:TRANsient:BWIDth
This command specifies the transient pulse width of the input resistance.
Like the transient A and B widths of CC and CV modes, this command takes 2 parameters, the time and
the units. The precision depends on the number of digits used. That means you can specify 12.45
seconds, but not 3021.4534 seconds, the last digit will be rounded (3031.45 in this case).
Command Syntax [SOURce:]RESistance:TRANsient:AWIDth
[SOURce:]RESistance:TRANsient:BWIDth
Parameters 100 uS to 3600 S
Unit S (second), mS (millisecond), or uS (microsecond)
*RST Value 500 uS
Examples RES:TRAN:AWID 0.001 S
RES:TRAN:BWID 10.5 mS
resistance:transient:bwidth 123.45 S
res:tran:bwidth 200 uS
Query Syntax [SOURce:]RESistance:TRANsient:AWIDth?
[SOURce:]RESistance:TRANsient:BWIDth?
Returned Parameters
Related Commands RES

[SOURce:] RESistance:VDRop
This command sets the LED cut-off voltage value when LED test function is ON.

Command Syntax
Parameters
Unit
*RST Value
Examples
Query Syntax

[SOURce:] RESistance:LED[:STATe]
This command enables or disables the LED test selection in constant resistence mode.
Command Syntax
Parameters
*RST Value
Examples
Query Syntax
Returned Parameters

[SOURce:]VOLTage:LED[:STATe]
0 | 1 | ON | OFF
ON
VOLT:LED 1
[SOURce:]VOLTage:LED[:STATe]?
0|1

[SOURce:]POWer
This command sets the power of the load when operating in constant power mode.
Command Syntax
Parameters
Unit
*RST Value
Examples
Query Syntax
Returned Parameters
Related Commands

[SOURce:]POWer[:LEVel][:IMMediate]
0 to max. rated power
W (power)
MINimum
POW 5 POW:LEV 3.5
[SOURce:]POWer[:LEVel][:IMMediate]?

POW:RANG

[SOURce:]POWer:RANGe
This command sets the power range of the load. This limits the settable range for power.

Command Syntax
Parameters
Unit
Examples
Query Syntax
Returned Parameters

[SOURce:]POWer:RANGe
0 to max. rated power.
W (power)
POW:RANG 15 SOUR:POW:RANGE MIN
[SOURce:]POWer:RANGe?

[SOURce:]POWer:HIGH
[SOURce:]POWer:LOW
This command sets the voltage high and low limit determined when in constant power mode.
Command Syntax [SOURce:]POWer:HIGH
[SOURce:]POWer:LOW
Parameters 0 to max. rated voltage
Unit V (volts)
Examples POW:HIGH 5
Query Syntax [SOURce:]POWer:HIGH? [SOURce:]POWer:LOW?
Returned Parameters

[SOURce:] POWer:TRANsient:MODE
This command selects the operating mode of the transient generator as follows in constant power
mode.
CONTinuous The transient generator puts out a continuous pulse stream upon receipt of a trigger.
PULSe
The transient generator puts out a single pulse upon receipt of a trigger.
TOGGle
The transient generator toggles between two levels upon receipt of a trigger.
Command Syntax
Parameters
*RST Value
Examples
Query Syntax
Returned Parameters
Related Commands

[SOURce:]RESistance:TRANsient:MODE
CONTinuous | PULSe | TOGGle
CONTinuous
RES:TRAN:MODE PULS
[SOURce:]RESistance:TRANsient:MODE?

RES:TRAN:ALEV TRAN

[SOURce:]POWer:TRANsient:ALEVel
[SOURce:]POWer:TRANsient:BLEVel
This command specifies the transient level of the input power. The transient function switches
between level A and level B.
Command Syntax [SOURce:]POWer:TRANsient:ALEVel
[SOURce:]POWer:TRANsient:BLEVel
Parameters M0 to max. rated power.
Unit Watts
Examples POW:TRAN:ALEV 5 POW:TRAN:BLEV 0.5
Query Syntax [SOURce:]POWer:TRANsient:ALEVel?
[SOURce:]POWer:TRANsient:BLEVel?
Returned Parameters
Related Commands RES

[SOURce:]POWer:TRANsient:AWIDth
[SOURce:]POWer:TRANsient:BWIDth
This command specifies the transient pulse width of the input resistance.
Like the transient A and B widths of CC and CV modes, this command takes 2 parameters, the time and
the units. The precision depends on the number of digits used. That means you can specify 12.45
seconds, but not 3021.4534 seconds, the last digit will be rounded (3031.45 in this case). When the
unit is S, the unit is optional.
Command Syntax [SOURce:]POWer:TRANsient:AWIDth
[SOURce:]POWer:TRANsient:BWIDth
Parameters 100 uS to 3600 S
Unit S (second) (optional), mS (millisecond), or uS
(microsecond)
*RST Value 500 uS
Examples POW:TRAN:AWID 0.001 S
POW:TRAN:BWID 10.5 mS
resistance:transient:bwidth 123.45 S
res:tran:bwidth 200 uS
Query Syntax SOURce:]POWer:TRANsient:AWIDth?
[SOURce:]POWer:TRANsient:BWIDth?
Returned Parameters
Related Commands POW

[SOURce:]POWer:PROTection
This command sets the soft power protection level. If the input power exceeds the soft power
protection level for the time specified by POW:PROT:DEL, the input is turned off.

NOTE: Use POW:PROT:DEL to prevent momentary power limit conditions caused by programmed
changes from tripping the overpower protection.

Command Syntax
Parameters
Unit
*RST Value
Examples
Query Syntax
Returned Parameters
Related Commands

[SOURce:]POWer:PROTection[:LEVel]
0 to max. rated power
W (power)
MAXimum
POW:PROT 100
[SOURce:]POWer:PROTection[:LEVel]?

POW:PROT:DEL

[SOURce:]POWer:PROTection:DELay
This command specifies the time that the input power can exceed the protection level before the input
is turned off.
Command Syntax
Parameters
Unit
*RST Value
Examples
Query Syntax
Returned Parameters
Related Commands

[SOURce:]POWer:PROTection:DELay]
0 to 60 seconds
seconds
0
POW:PROT:DEL 5
[SOURce:]POWer:PROTection:DELay?

POW:PROT

[SOURce:]POWer:CONFig
This command sets the hard power protection level.
Command Syntax
Parameters
Unit
Examples

[SOURce:]POWer:CONFig[:LEVel]
0 through max. Rated power
W (power)
POW:CONFig 100

Query Syntax [SOURce:]POWer:CONFig[:LEVel
Returned Parameters
Related Commands POW:PROT

List Commands
List commands allow you to program complex sequences of input changes with rapid, precise timing,
and synchronized with trigger signals. Each function for which lists can be generated has a list of values
that specify the input at each list step.

[SOURce:]LIST:RANGe
This command sets the current range for list mode. It also limits the maximum settable current.
Depending on the value, range will automatically switch between high or low depending on which
gives the best resolution and accuracy.
Command Syntax
Parameters
Unit
Examples
Query Syntax
Returned Parameters
Related Commands

[SOURce:]LIST:RANGe
0 to max. rated current.
None
LIST:RANGE 30
[SOURce:]LIST:RANGe?

LIST:LEV

[SOURce:]LIST:SLOWrate[:STATe]
This command sets the mode of the slew rate between high-rate and low-rate. When set to high-rate,
the slew rate set by [SOURce:]LIST:SLEW command will be in A/us unit. When in low-rate, it will be set
to A/ms unit.
Command Syntax [SOURce:]LIST:SLOWrate[:STATe] <0,1>
Parameters 0 – High-rate
1 – Low-rate
Unit None
Examples LIST:SLOW 1
Query Syntax [SOURce:]LIST:SLOWrate[:STATe]?
Returned Parameters <0 or 1>
Related Commands LIST:SLEW

[SOURce:]LIST:COUNt
This command sets the number of times that the list is executed before it is completed. The command
accepts parameters in the range 1 through 65536, but 65536 is interpreted as infinity.

Command Syntax
Parameters
Examples
Query Syntax
Returned Parameters
Related Commands

[SOURce:]LIST:COUNt
1 to 65536
LIST:COUN 3
[SOURce:]LIST:COUNt?

LIST:STEP

[SOURce:]LIST:STEP
This command sets the total number of steps in the list.
Command Syntax
Parameters
Examples
Query Syntax
Returned Parameters
Related Commands

[SOURce:]LIST:STEP
2 to 84
LIST:STEP 5
[SOURce:]LIST:STEP?

LIST:LEV

[SOURce:]LIST:LEVel?
This command specifies the level value
Command Syntax
Parameters
Unit
Examples
Query Syntax

[SOURce:]LIST:LEVel ,
1 to max. rated current.
None, None
LIST:LEV 1, 10 LIST:LEV 2, 15.2
[SOURce:]LIST:LEVel?
is step number
Returned Parameters
Related Commands LIST:RANG

[SOURce:]LIST:SLEW

This command sets the slew rate for each step. This command programs both positive and negative
going slew rates. MAXimum sets the slew to its fastest possible rate. MINimum sets the slew to its
slowest rate.
Command Syntax [SOURce:]LIST:SLEW ,
Parameters See specifications for range
Unit Unit is determined by [SOURce:]LIST:SLOWrate[:STATe]
command. It will be in A/us or A/ms if high-rate or lowrate is set respectively.
Examples LIST:SLEW 1, 1.5 LIST:SLEW 2, MAX
Query Syntax [SOURce:]LIST:SLEW?
is step number
Returned Parameters
Related Commands CURR:SLEW

[SOURce:]LIST:WIDth
This command sets the sequence of list dwell times. Each value represents the time in seconds that the
input will remain at the particular list step point before completing the step. If times exceed 16383S,
the input remains at the present level until a trigger sequences the next point in the list. Else At the
end of the dwell time, the input automatically changes to the next point in the list.
Command Syntax
Parameters
Unit
Examples
Query Syntax

[SOURce:]LIST:WIDth ,
20 us to 3600 s
s (seconds)
LIST:WID 1, 0.02 LIST:WID 2, 0.5
[SOURce:]LIST:WIDth?
is step number
Returned Parameters

[SOURce:]LIST:SAV
This command stores the present list file of the electronic load to a specified location in memory. Up to
5 files can be stored. Files saved in locations 1-5 are nonvolatile and the data will be saved when power
is removed.
Command Syntax
Parameters
Examples
Related Commands

[SOURce:]LIST:SAV
1 to 5
LIST:SAV 3
LIST:RCL

[SOURce:]LIST:RCL
This command restores a list file that was previously stored in memory with a LIST:SAV command to
the specified location.
Command Syntax
Parameters
Examples
Related Commands

[SOURce:]LIST:RCL
1 to 5
LIST:RCL 3
LIST:SAV

Measurement Commands
The signal-oriented measurement commands are used to acquire readings. You can use these highlevel instructions to control the measurement process.
Making Measurements
The electronic load has the ability to make several types of voltage or current measurements. The
measurement capabilities of the electronic load are particularly useful with applications that draw
current in pulses.
All measurements are performed by digitizing the instantaneous input voltage or current for a defined
number of samples and sample interval, storing the results in a buffer, and then calculating the
measured result. Many parameters of the measurement are programmable. These include the number
of samples, the time interval between samples, and the method of triggering. Note that there is a
tradeoff between these parameters and the speed, accuracy, and stability of the measurement in the
presence of noise.
There are two ways to make measurements:
1) Use the MEASure commands to immediately start acquiring new voltage or current data,
and return measurement calculations from this data as soon as the buffer is full. This is the
easiest way to make measurements, since it requires no explicit trigger programming.
2) Use an acquisition trigger to acquire the data. Then use the FETCh commands to return
calculations from the data that was retrieved by the acquisition trigger. This method gives
you the flexibility to synchronize the data acquisition with a trigger. FETCh commands do
not trigger the acquisition of new measurement data, but they can be used to return many
different calculations from the data that was retrieved by the acquisition trigger.
Making triggered measurements with the acquisition trigger system is discussed in the User Manual.

NOTE: For each MEASure form of the query, there is a corresponding query that begins with the
header FETCh. FETCh queries perform the same calculation as their MEASure counterparts, but do not
cause new data to be acquired. Data acquired by an explicit trigger or a previously programmed
MEASure command are used.

:FETCh:VOLTage?
:FETCh:CURRent?
:FETCh:POWer[:DC]?
These query commands request the latest post-processed readings stored in the sample buffer. After
sending this command and addressing the electronic load to talk, the readings are sent to the
computer. This command does not affect the instrument setup. This command does not trigger sourcemeasure operations; it simply requests the last available readings. Note that this command can
repeatedly return the same readings. Until there are new readings, this command continues to return
the old readings.
For example, assume that the electronic load performed 20 measure operations. The :FETCh:VOLTage?
command will request the readings for those 20 measure operations. If :FETCh:VOLTage? is sent while
performing measure operations (ARM annunciator on), it will not be executed until the electronic load
goes back to the idle state.

:MEASure:VOLTage[:DC]?
:MEASure:CURRent[:DC]?
These commands combine other signal-oriented measurement commands to perform a “one-shot”
measurement and acquire the reading. Note that if a function is not specified, the measurement will
be done on the function that is presently selected.

Sense Commands
The Sense subsystem is used to configure and control the measurement functions of the electronic
load. A function does not have to be selected before you program its various configurations. A function
can be selected any time after it has been programmed. Whenever a programmed function is selected,
it assumes the programmed states.

SENSe:AVERage:COUNt
The command is used to specify the filter count. In general, the filter count is the number of readings
that are acquired and stored in the filter buffer for the averaging calculation. The larger the filter
count, the more filtering that is performed.
Command Syntax
Parameters
*RST Value
Examples
Query Syntax
Returned Parameters
Related Commands

SENSe:AVERage:COUNt
2 to 16
8
SENS:AVER:COUN 10
SENSe:AVERage:COUNt?

SENS:AVER

3.4 SCPI Command Tree
TRACe Command Summary
Commands

Description

Default

:TRACe
:CLEar

Clear readings from buffer.

:FREE?

Query points available and points in use.

:POINts

Specify size of buffer (2 to 1024).

:POINts?

Query buffer size.

:FEED

Select source of readings (VOLTage, CURRent,
TWO).

TWO

:CONTrol

Select buffer control mode (NEVer or NEXT).

NEVer

:CONTrol?

Query buffer control mode.

:FEED?

Query source of readings for buffer.

:FILTer
[:STATe]

Select the type of buffer data

[:STATe]?

Query the type of buffer data

:DELay
:DELay?

Set the trigger delay time
Query the trigger delay time

OFF

:TIMer

Set the timer interval

:TIMer?

Query the timer interval

:DATA?

Read all data in the buffer.

SOURce Command Summary
Commands

Description

Default

[:SOURce]
:INPut
[:STATe]

Set input state.

[:STATe]?

Query input state.

:SHORt

Set load short state.

:SHORt?

Query load short state.

:SYNCon

Set the ON/OFF state for trace mode.

:SYNCon?

Query the ON/OFF state for trace mode.

OFF

:TIMer
[:STATe]

Set the timer ON/OFF state.

[:STATe]?

Query the timer ON/OFF state.

:DELay

Set the delay time for timer.

:DELay?

Query the delay time for timer.

:REMote
:SENSe

Set the remote sense ON/OFF state.

:SENSe?

Query the remote sense ON/OFF state.

:FUNCtion
:MODE
:MODE?
:FUNCtion?

Set electronic load’s regulation mode
(VOLTage, CURRent, RESistance, POWer,
IMPEDANCE).
Set electronic load’s input mode (FIXed or
LIST).

CURRent
FIXed

Query electronic load’s input mode.
Query electronic load’s regulation mode.

:TRANsient
[:STATe]

Enable or disable transition mode.

[:STATe]?

Query electronic load’s transition mode.

OFF

:CURRent
[:LEVel]
:RANGe

Set constant current range.

MAX

:RANGe?

Query constant current range.

:SLEW
[:BOTH]

Set both positive and negative slew rate for
current

MAX

:POSitive

Set positive slew rate for current

MAX

:POSitive?

Query positive slew rate for current

:NEGative

Set negative slew rate for current

:NEGative?

Query negative slew rate for current

:PROTection
[:STATe]

Disable or enable current protection

[:STATe]?

Query current protection state

:LEVel

Set current protection level

:LEVel?

Query current protection level

:DELay

Set current protection delay time

:DELay?

Query current protection delay time

MAX

:TRANsient
:MODE

Set current transiton mode (CONTinuous,
PULSe, or TOGGle)

:MODE?

Query current transition mode

:ALEVel

Set current transition level A

:ALEVel?

Query current transition level A

:AWIDth

Set current transition width A

:AWIDth?

Query current transiton width A

:BLEVel

Set current transition level B

:BLEVel?

Query current transition level B

:BWIDth

Set current transition width B

:BWIDth?

Query current transiton width B

:HIGH

Set the voltage specification of upper limit

:HIGH?

Query the voltage specification of upper limit

:LOW

Set the voltage specification of lower limit

CONTinuous

MAX

500uS

MIN

500uS

:LOW?

Query the voltage specification of lower limit

:VOLTage
[:LEVel]
:ON

Set VON level

:ON?

Query VON level

:RANGe

Set constant voltage range

:RANGe?

Query constant voltage range

:AUTO

Set the auto range mode for the voltmeter

:AUTO?

Query the auto range mode for the voltmeter

:LATCh

Enable or disable Von in latch mode

:LATCh?

Query Von latch mode

:HIGH

Set the current specification of upper limit

:HIGH?

Query the current specification of upper limit

:LOW

Set the current specification of lower limit

:LOW?

Query the current specification of lower limit

MAX

MIN

MAX

:RESistance
[:LEVel]
:RANGe

Set constant resistance range

:RANGe?

Query constant resistance range

:HIGH

Set the voltage specification of upper limit

:HIGH?

Query the voltage specification of upper limit

:LOW

Set the voltage specification of lower limit

:LOW?

Query the voltage specification of lower limit

:VDRop

Set Vd for CR-LED mode.

:LED?

Query the CR-LED mode

:LED

Enable or disable CR-LED mode

MAX

:POWer
[:LEVel]
:RANGe

Set power protection delay time

:RANGe?

Query power protection delay time

:PROTection
:LEVel

Set hardware power protection level

:LEVel?

Query hardware power protection level

:DELay

Set the delay time after power protection.

:DELay?

Query the delay time after power protection.

:CONFig

Set the hard power protection level.

:CONFig?

Query the hard power protection level.

:LIST
:RANGe

Set list range

:RANGe?

Query list range

:SLOWrate

Sets the rate mode of the slew rate

:SLOWrate?

Query the rate mode of the slew rate

:COUNt

Set list cycle (1 to 65536)

:COUNt?

Query list cycle

:STEP

Set total list step (2 to 84)

:STEP?

Query list step

:LEVel ,

Set list step level

:LEVel?

Query list step level

0 (high-rate)

:SLEW
[:BOTH]

Set list step slew rate

[:BOTH]?

Query list step slew rate

:WIDth ,

Set list step width

:WIDth

Query list step width

:SAV

Save list file to specify filename (1 to 5)

:RCL

Recall list file

:PROTection:CLEar

Clear protection

SENSe Command Summary

Commands

Description

Default

:SENSe
:AVERage
:COUNt

Set filter count (1 to 100).

:COUNt?

Query filter count.

MEASure, FETch Command Summary
Commands

Description

Default

:MEASure
:VOLTage
:CURRent
:FETch
:VOLTage
:CURRent
:POWer?

Fetch the last measured power

TRIGger Command Summary
Commands

Description

:TRIGger

Path to program trigger layer.

[:IMMediate]

Generates a trigger signal.

:TIMer

Set timer interval (0.01 to 999.99sec).

:TIMer?

Query the programmed timer interval.

Default

0.1

SYSTem Command Summary
Commands

Description

Default

:SYSTem
:PRESet

Return to :SYST:PRESet defaults.

:POSetup

Select power-on setup: (RST or SAV0).

RST

:POSetup?

Query power-on setup.

:VERsion?

Query rev level of SCPI standard.

:ERRor?

Query (read) Error Queue.

:CLEar

Clears messages from the Error Queue.

:LOCal

Take load out of remote and restore operation
of front panel controls.

:REMote

Place load in remote control.

:RWLock

Lockout front panel controls.

STATus Command Summary
Commands

Description

:STATus
:OPERation

Default
(note 1)

Path to control operation status register.

[:EVENt]?

Read the event register.

(note 2)

:ENABle

Program the enable register.

(note 3)

:ENABle?

Read the enable register.

:CONDition?

Read the condition register.

:QUEStionable

Path to control questionable status register.

[:EVENt]?

Read the event register.

(note 2)

:ENABle

Program the enable register.

(note 3)

:ENABle?

Read the enable register.

:CONDition?

Read the condition register.

:PRESet

Return status register to default states.

Notes:
1. Commands in the STATus subsystem are not affected by *RST and :SYSTem:PRESet. The effects of
cycling power, *CLS and :STATus:PRESet are explained by the following notes.
2. Event Registers: Power-up and *CLS clears all bits of the registers. :STATus:PRESet has no effect.
3. Enable Registers: Power-up and :STATus:PRESet clears all bits of the registers. *CLS has no effect.

Chapter 4
Programming Examples
4.1 Introduction
This chapter contains examples on how to program your electronic load. Simple examples show you
how to program:





Input functions such as voltage, current, and resistance
Measurement functions
Status and protection functions
Transient functions, including lists

NOTE: The examples in this chapter show which commands are used to perform a particular function,
but do not show the commands being used in any particular programming environment.

4.2 Programming the Input
Power-on Initialization
When the electronic load is first turned on, it wakes up with the input state set OFF. The following
commands are given implicitly at power-on:





*RST or *RCL 0
*CLS
*SRE 0
*ESE 0

*RST is a convenient way to program all parameters to a known state. Refer to the *RST command in
3.2 Common Commands to see how each programmable parameter is set by *RST. Refer to the *PSC
command in 3.2 Common Commands for more information on the power-on initialization of the *ESE
and the *SRE registers.

Enabling the Input

To enable the input, use the command:
INPut ON
Input Voltage
The input voltage is controlled with the VOLTage command. For example, to set the input voltage to 25
volts, use:
VOLTage 25

Input Current
All models have a programmable current function. The command to program the current is:
CURRent
where is the input current in amps.

Overcurrent Protection
The electronic load can also be programmed to turn off its input if the current protection level is
reached.
As explained in 3.3 Subsystem Commands, this protection feature is implemented by the following
command:
CURRent:PROTection:STATe ON | OFF

NOTE: Use CURRent:PROTection:DELay to prevent momentary current limit conditions caused by
programmed input changes from tripping the overcurrent protection.
Generating Triggers
You can generate a single trigger by sending the following command over the GPIB:
TRIGger:IMMediate
Note that this command will always generate a trigger. Use the TRIGger:SOURce command to select
other trigger sources such as the mainframe's external trigger input.
Programming Transients
Transient operation is used to synchronize input changes with internal or external trigger signals, and

simulate loading conditions with precise control of timing, duration, and slew. The following transient
modes can be generated:
Continuous
Pulse
Toggled

Generates a repetitive pulse stream that toggles between two load levels.
Generates a load change that returns to its original state after some time period.
Generates a repetitive pulse stream that toggles between two load levels. Similar to
Continuous mode except that the transient points are controlled by explicit triggers
instead of an internal transient generator.

NOTE: Before turning on transient operation, set the desired mode of operation as well as all of the
parameters associated with transient operation. At *RST all transient functions are set to OFF.

Continuous Transients
In continuous operation, a repetitive pulse train switches between two load levels. The rate at which
the level changes is determined by the slew rate. In addition, use the following commands to program
continuous transients:
CURRent:TRANsient:MODE CONTinuous
CURRent:TRANsient:ALEVel 5
CURRent:TRANsient:AWIDth 0.4 mS
CURRent:TRANsient:BLEVel 10
CURRent:TRANsient:BWIDth 0.6 mS
TRANsient ON
TRIGger:IMMediate
This example assumes that the CC mode is active and the slew rate is at the default setting (maximum
rate). The electronic load module starts conduction at the main level (in this case 5 amps). When
transient operation is turned on, the module’s input current will slew to and remain at 10 amps for
60% of the period (600 us). The input current will then slew to and remain at 5 amps for the remaining
40% (400 us) of that cycle.
Pulse Transients
Pulsed transient operation generates a load change that returns to level B state after some time
period. It is similar to continuous operation with the following exceptions:
a.
b.

To get a pulse, an explicit trigger is required. To specify the trigger source, use
TRIGger:SOURce.
One pulse results from each trigger. Therefore, frequency cannot be programmed. Use the
following commands to program pulsed transients:

CURRent:TRANsient:MODE PULSe
CURRent:TRANsient:ALEVel 5
CURRent:TRANsient:BLEVel 10
CURRent:TRANsient:BWIDth 10 mS
TRANsient ON
TRIGger:IMMediate
This example assumes that the CC mode is active, the slew rate is at the factory default setting
(maximum rate), and a trigger signal is connected to the mainframe's external trigger input. The
electronic load module starts conduction at the transient level A setting (5 amps). When the transient
mode is turned on and an external trigger signal is received (or TRIGger:IMMediate is received), the
input level starts increasing at a rate determined by the slew rate. When the value specified by the
transient level setting (5 amps) is reached, it stays there for the remainder of the time determined by
the pulse width setting (10 ms). After this time has elapsed, the input level decreases to the main level
again at the rate specified by the slew setting and remains there until another trigger is received. Any
triggers that occur during the time the transient level is in effect will re-trigger the pulse, extending the
pulse by another pulse-width value.
Toggled Transients
Toggled transient operation causes the module input to alternate between two pre-defined levels as in
continuous operation except that the transient transitions are controlled by explicit triggers instead of
the internal transient generator. Use the following commands to program toggled transients:
TRIGger:SOURce EXTernal
CURRent:TRANsient:MODE TOGGle
CURRent:TRANsient:ALEVel 5
CURRent:TRANsition:BLEVel 10
TRANsient ON
This example assumes that CC mode is active, the slew rate is at the factory default setting (maximum
rate) and a trigger signal is connected to the mainframe's external trigger input. Toggled transient
operation is similar to that described for continuous and pulse operation, except that each time a
trigger is received the input alternates between the level A and level B current levels.

4.3 Programming Lists
List mode lets you generate complex sequences of input changes with rapid, precise timing, which may
be synchronized with internal or external signals. This is useful when running test sequences with a
minimum amount of programming overhead. You can program up to 84 steps in the list, the time
interval that each setting is maintained, the number of times that the list will be executed, and how the
settings change in response to triggers. All list data can be stored in nonvolatile memory using the
LIST:SAV command. This means that the programmed data for any list will be retained when the
electronic load is turned off. Use the LIST:RCL command to recall the saved state.

4-Step Current Change List Example
The following example procedure shows how to generate and save a simple 4-step list of current
changes. When programming, be sure to verify all parameters are within the module’s specifications.
1. Set the current range of the list.
LIST:RANGe 40
2. Set the list cycle.
LIST:COUNt 10000
3. Specify the number of steps in the list.
LIST:STEP 4
4. Specify the current setting for step 1.
LIST:LEVel 1,5
5. Set the current slew rate for step 1.
LIST:SLEW 1,1
6. Set the width for step 1.
LIST:WIDth 1,10ms
7. Specify the current setting for step 2.
LIST:LEVel 2,10
8. Set the current slew rate for step 2.
LIST:SLEW 2,1
9. Set the width for step 2.
LIST:WIDth 2,10ms
10. Specify the current setting for step 3.
LIST:LEVel 3,20

11. Set the current slew rate for step 3.
LIST:SLEW 3,1
12. Set the width for step 3.
LIST:WIDth 3,10ms
13. Specify the current setting for step 4.
LIST:LEVel 4,15
14. Set the current slew rate for step 4.
LIST:SLEW 4,1
15. Set the width for step 4.
LIST:WIDth 4,10ms
16. Save the list to memory location 2.
LIST:SAV 2
17. Set the input regulation mode to be
controlled by values in a list.
FUNCtion:MODE LIST
18. Set trigger source to BUS
TRIG:SOUR BUS
19. Run the list file
*TRG

Chapter 5
Error Messages
Error Number List
This appendix gives the error numbers and descriptions that are returned by the electronic load. Error

numbers are returned in two ways:
1) Error numbers are displayed on the front panel.
2) Error numbers and messages are read back with the SYSTem:ERRor? query. SYSTem:ERRor?
returns the error number into a variable and returns two parameters, an NR1 and a string.
The following table lists the errors that are associated with SCPI syntax errors and interface problems.
It also lists the device dependent errors. Information inside the brackets is not part of the standard
error message, but is included for clarification. When errors occur, the Standard Event Status register
records them in bit 2, 3, 4, or 5:
Table 1 - Error Numbers

Error

Error String [Description/Explanation/Examples]
Command Errors 100 through 199 (sets Standard Event Status Register bit #5 CME)

101

DESIGN ERROR: Too many numeric suffices in Command Spec

110

No Input Command to parse

114

Numeric suffix is invalid value

120

Parameter of type Numeric Value overflowed its storage

130

Wrong units for parameter

140

Wrong type of parameter(s)

150

Wrong number of parameters

160

Unmatched quotation mark (single/double) in parameters

165

Unmatched bracket

170

Command keywords were not recognized

190

Too many dimensions in entry to be returned in parameters

191

Too many char
Execution Errors –200 through –299 (sets Standard Event Status Register bit #4 EXE)

-200

Execution error [generic]

-221

Settings conflict [check current device state]

-222

Data out of range [e.g., too large for this device]

-223

Too much data [out of memory; block, string, or expression too long]

-224

Illegal parameter value [device-specific]

-225

Out of memory

-270

Macro error

-272

Macro execution error

-273

Illegal macro label

-276

Macro recursion error

-277

Macro redefinition not allowed
System Errors –300 through –399 (sets Standard Event Status Register bit #3 DDE)

-310

System error [generic]

-350

Too many errors [errors beyond 9 lost due to queue overflow]
Query Errors -400 through -499 (sets Standard Event Status Register bit #2)

-400

Query error [generic]

-410

Query INTERRUPTED [query followed by DAB or GET before response complete]

-420

Query UNTERMINATED [addressed to talk, incomplete programming message received]

-430

Query DEADLOCKED [too many queries in command string]

-440

Query UNTERMINATED [after indefinite response]
Self-test Errors 0 through 99 (sets Standard Event Status Register bit #3)

No error

Module Initialization Lost

Mainframe Initialization Lost

Module Calibration Lost

Non-volatile RAM STATE section checksum failed

Non-volatile RAM RST section checksum failed

RAM selftest

CVDAC selftest 1

CVDAC selftest 2

CCDAC selftest 1

CCDAC selftest 2

CRDAC selftest 1

CRDAC selftest 2

Input Down

Flash write failed

Flash erase failed

Digital I/O selftest error
Device-Dependent Errors 100 through 32767 (sets Standard Event Status Register bit #3)

213

RS-232 buffer overrun error

216

RS-232 receiver framing error

217

RS-232 receiver parity error

218

RS-232 receiver overrun error

220

Front panel UART overrun

221

Front panel UART framing

222

Front panel UART parity

223

Front panel buffer overrun

224

Front panel timeout

225

Front CRC check error

226

Front cmd Error

401

CAL switch prevents calibration

402

CAL password is incorrect

403

CAL not enabled

404

Computed readback cal constants are incorrect

405

Computed programming cal constants are incorrect

406

Incorrect sequence of calibration commands

407

CV or CC status is incorrect for this command

603

FETCH of data that was not acquired

604

Measurement overrange

v070116

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