Pasco Specialty And Mfg Temperature Array Ps 2157 Users Manual 012 08867A

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Instruction Manual

012-08867A

Temperature Array

PS-2157

Introduction

The PASPORT Temperature Array works with up to eight temperature probes and a PASPORT interface to col-

lect multiple streams of temperature data at up to 200 samples per second per channel.

Included Equipment Part Number

1. Temperature Array PS-2157

2. Eight-probe Bundle 514-09083

3. Fast Response Temperature Probes (qty. 3) PS-2135 (3-pack)

4. Adhesive Patches (qty. 10) PS-2525 (100-pack)

Compatible Temperature Probes

Fast-response Temperature Probes PS-2135 (3-pack)

Stainless Steel Temperature Probe PS-2153

Skin/Surface Temperature Probe PS-2131

10 kΩ thermistors embedded in other PASCO devices see PASCO catalog or www.pasco.com

Compatible PASPORT Interfaces

Xplorer GLX PS-2002

Xplorer PS-2000

Power Link PS-2001

USB Link PS-2100

3

4

1

2

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Temperature Array Setup

2

Separate temperature probes (such as the three included fast-response probes) can be

connected to the individual input ports, numbered 1 through 8 (right); or the special

eight-probe bundle (below) can be connected to the multiport (below right).

Eight-probe bundle

Each of the probes in the eight-probe bundle is identified by a colored band. The col-

ors correspond to the Temperature Array’s data channel numbers as shown in the

table (right).

When measuring the surface temperature of a person or object, use the included adhe-

sive patches to attach the probes.

Other PASCO devices containing embedded 10 kΩ thermistors (such as the Heat

Conduction Apparatus, TD-8513) can be connected to the individual ports or the mul-

tiport of the Temperature Array using the cables included with those devices.

Setup

Hardware Setup

The following three steps can be performed in any order.

1. Connect the eight-probe bundle to the multiport or connect up to eight separate

temperature probes to the individual input ports.

Probes can be connected to the individual ports in any order (you don’t have to start with port 1),

and any of the ports can be left unconnected.

Do not use the individual ports and the multiport at the same time.

2. Connect the cable of the Temperature Array to a PASPORT interface.

3. If you will be using a computer, connect the PASPORT interface to the com-

puter’s USB port.

DataStudio Setup

If you will be using the Temperature Array with a computer, install

DataStudio version 1.9.5 first.

1. When you connect the Temperature Array to the computer

through a PASPORT interface, the PASPortal window will

launch automatically (if DataStudio is not already run-

ning.

2. Double click Temperature Array.ds to open the Tempera-

ture Array’s configured file in DataStudio.

Eight-probe bundle

connected to multiport

The color scheme is simi-

lar to the one commonly

used to identify resistor

values.

Color

Data

Channel

Number

Brown 1

Red 2

Orange 3

Yellow 4

Green 5

Blue 6

Violet 7

Gray 8

Three probes

connected to

individual ports

double click

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Model No. PS-2157 Setup

3

To open to configuration file directly, navigate to the folder

c:\Program Files\DataStudio\eLabs\Sensors\ (Windows) or

HD:Aplications:DataStudio:eLabs:Sensors (Mac).

3. The configuration file contains a run of sample

data showing the data color corresponding to each

data channel.

To delete the sample data before collecting your own data,

press Alt+Minus (Windows) or +Minus (Mac).

4. Click to begin data collection.

To view and change the sample rate, units of measure,

and other sensor properties, click .

Xplorer and Xplorer GLX Setup

If you will be using an Xplorer or Xplorer GLX in logging mode (not connected to a

computer), connect the Temperature Array to the Xplorer or Xplorer GLX and press

to begin data collection.

Multiple-measurement Alignment

When you are using multiple temperature probes, you

may find that their reading differ slightly when they are

measuring the same thing. In the example illustrated

(right), measurements from eight probes in the same

container of water vary by about 0.3 °C. The multi-

ple-measurement alignment procedure adjusts the cali-

brations of the probes so they agree more closely.

The procedure described here for DataStudio can also be performed on the Xplorer GLX. See the

Xplorer GLX Users’ Guide for detailed instructions.

1. Click to open the Experiment Setup window. Click

to open the calibration dialog box.

2. From the Sensor field, select the Temperature Array.

3. Select the “Calibrate all similar measurements simulta-

neously” option.

4. Place all of the probes in a container of room-temperature

water. (If you are calibrating thermistors embedded in a

device, allow the thermistors to come to equilibrium at room

temperature.)

5. Observe the Present Sensor Measurement and wait until it

has stabilized.

6. From the Calibration Type menu, select 1 Point (Adjust Off-

set Only).

7. Click the Read From Sensor button for Point 1.

8. Click OK to accept the new calibration; or click Cancel to

revert to the previous or default calibration.

DataStudio configuration file,

Temperature Array.ds

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Temperature Array Specifications

4

Two-point calibration

Though it is usually not necessary, a two-point calibration can be performed on a sin-

gle probe, or on all probes simultaneously, to make the measurements more accurate.

For step-by-step instructions refer to the documentation for DataStudio version 1.9.5,

the Xplorer, or the Xplorer GLX.

Oversampling

The degree of oversampling that takes place within the Temperature Array depends

on the sample rate and the number of connected probes. To maximize the oversam-

pling, set the sample rate as low as possible and disconnect any unused probes. In

many cases, increased oversampling reduces noise, produces smoother data, and

improves the measurement resolution. This effect is especially noticeable when very

small temperature changes are measured.

Measurement Repetition

At high sample rates, the Temperature Array may occasionally repeat a measured

value in order to maintain the flow of data without exceeding its processing capacity.

The maximum sample rate at which this does not occur depends on the number of

connected probes, as shown in the table (right).

At sample rates above these thresholds, you may notice that a rapidly changing tem-

perature graph has occasional plateaus where the sampled temperature remains con-

stant for two or more points in a row. To reduce the effect of measurement repetition,

use the smooth(n, x) function in DataStudio’s calculator. (For information about the

smooth function, open the Help menu in DataStudio and search for “smooth.”)

Specifications

Maximum Sample Rate

without

Measurement Repetition

Number of

Probes

Rate

(Hz)

1 200

2 or 3 100

4 to 8 50

Measurement Range -35 °C to 135 °C (probe dependent)

Maximum Range of Fast-response Probes

and Eight-probe Bundle

-35 °C to 70 °C

Accuracy ±0.5 °C

Resolution 0.0025 °C

Repeatability 0.01 °C

Maximum Sample Rate 200 Hz per Temperature Sensor

Unit Options °C, °F, K

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Model No. PS-2157 Technical Support

5

Technical Support

For assistance with any PASCO product, contact PASCO at:

Limited Warranty

For a description of the product warranty, see the PASCO catalog.

Copyright

The PASCO scientific 012-08867A

Temperature Array Instruction Manual

is copyrighted with all rights reserved. Permission is

granted to non-profit educational institutions for reproduction of any part of this manual, providing the reproductions are used only in

their laboratories and classrooms, and are not sold for profit. Reproduction under any other circumstances, without the written con-

sent of PASCO scientific, is prohibited.

Trademarks

PASCO, PASCO scientific, DataStudio, PASPORT, Xplorer, and Xplorer GLX are trademarks or registered trademarks of PASCO sci-

entific, in the United States and/or in other countries. For more information visit www.pasco.com/legal. Windows is a registered trade-

mark of Microsoft Corporation in the United States and/or other countries. Mac is trademark of Apple Computer, Inc., registered in the

U.S. and other countries.

Address: PASCO scientific

10101 Foothills Blvd.

Roseville, CA 95747-7100

Phone: 916-786-3800 (worldwide)

800-772-8700 (U.S.)

Fax: (916) 786-3292

Web: www.pasco.com

Email: support@pasco.com