90899 Manual For The 7 Function Digital Multimeter

User Manual: Manual for the 90899 7 Function Digital Multimeter Digital Multimeter - Save on this 7 Function Digital Multimeter

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7 FUNCTION DIGITAL MULTIMETER

OPERATING INSTRUCTIONS

3491 Mission Oaks Blvd., Camarillo, CA 93011

Visit our Web site at http://www.harborfreight.com

Copyright© 2004 by Harbor Freight Tools®. All rights reserved. No portion

of this manual or any artwork contained herein may be reproduced in any

shape or form without the express written consent of Harbor Freight Tools.

For technical questions and replacement parts, please call 1-800-444-3353

90899

SKU 90899 For replacement parts, please call 1-800-444-3353. Page 2

Specifications

Save This Manual

You will need the manual for the safety warnings and

precautions, and operating and maintenance procedures.

Keep your invoice with this manual. Write the invoice number

on the inside of the front cover. Keep the manual and invoice

in a safe and dry place for future reference.

Safety Warnings and Precautions

WARNING: When using tool, basic safety precautions should always be

followed to reduce the risk of personal injury and damage to

equipment.

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Warnings continued on page 3.

REV 12/06

SKU 90899 For replacement parts, please call 1-800-444-3353. Page 3

Read all instructions before using this tester!

1. Avoid working alone. If an accident happens, an assistant can

bring help.

2. Keep work area clean. Cluttered areas invite injuries.

3. Avoid electrical shock. Use extreme caution when using this tool

near uninsulated conductors or bus bars. Prevent body contact with

grounded surfaces such as pipes, radiators, ranges, and cabinet

enclosures when testing voltages.

4. Avoid damaging meter. Use only as specified in this manual.

5. Observe work area conditions. Do not test voltages in damp or

wet locations. Don’t expose to rain. Keep work area well lit.

6. Keep children away. Children must never be allowed in the work

area. Do not let them handle machines, tools, or extension cords.

7. Store idle equipment. When not in use, tools must be stored in a

dry location to inhibit rust. Always lock up tools and keep out of

reach of children.

8. Dress properly. Do not wear loose clothing or jewelry as they can

be caught in moving parts. Protective, electrically nonconductive

clothes and nonskid footwear are recommended when working. Wear

restrictive hair covering to contain long hair.

9. Use eye protection. Always wear ANSI approved impact safety

goggles.

10. Do not overreach. Keep proper footing and balance at all times. Do

not reach over or across electrical cables or frames.

11. Maintain tools with care. Ensure multimeter has a fresh battery.

Inspect test leads periodically and, if damaged, have them repaired

by an authorized technician.

12. Stay alert. Watch what you are doing, use common sense. Do not

operate any tool when you are tired.

13. Check for damaged parts. Before using any tool, any part that

appears damaged should be carefully checked to determine that it

will operate properly and perform its intended function. Check for any

broken parts and any other condition that may affect proper operation.

Any part that is damaged should be properly repaired or replaced by

a qualified technician. Do not use the tool if any switch does not operate

properly.

SKU 90899 For replacement parts, please call 1-800-444-3353. Page 4

Unpacking

When unpacking, make sure the following parts are included: Digital

Multimeter, and black and red Test Leads. If any parts are missing or broken, please

call Harbor Freight Tools at the number on the cover of this manual. If any part of the

machine is missing or broken, please call Harbor Freight Tools at the number on the

front cover as soon as possible.

15. Replacement parts and accessories. When servicing, use only

identical replacement parts. Use of any other parts will void the

warranty. Only use accessories intended for use with this tool.

Approved accessories are available from Harbor Freight Tools.

16. Do not operate tool if under the influence of alcohol or drugs.

Read warning labels on prescriptions to determine if your judgment

or reflexes are impaired while taking drugs. If there is any doubt, do

not operate the tool.

17. We recommend that only a licensed electrician work on high-

voltage or other potentially dangerous circuits.

Note: Performance of this tool may vary depending on condition of internal

battery.

Warning: The warnings, cautions, and instructions discussed

in this instruction manual cannot cover all possible

conditions and situations that may occur. It must be

understood by the operator that common sense and

caution are factors which cannot be built into this

product, but must be supplied by the operator.

Warning: This product contains or produces chemicals,

including lead, known to the State of California to

cause cancer and birth defects (or other

reproductive harm).

(California Health & Safety Code 25249.5 et seq.)

Operation

WARNING:ELECTRICAL SHOCK CAN CAUSE DEATH OR

INJURY. AVOID TOUCHING EXPOSED CONDUCTORS

OF ELECTRICITY.

Additional Multimeter Precautions

1. Do not test voltage on AC circuits higher than 750 volts.

2. Do not test voltage on DC circuits higher than 1000 volts.

3. Do not test current on circuits higher than 10 amps.

SKU 90899 For replacement parts, please call 1-800-444-3353. Page 5

4. Be careful not to

apply voltage to

the Test Leads

when they are

connected to the

COM (Bottom)

and VΩmA

(Center) Jacks

and the Multimeter

is in an Ohms

testing setting.

Damage can occur to the

multimeter or the fuse may

blow.

5. Do not switch between

testing modes with the

multimeter connected to a

circuit.

AC Voltage Measurements

Measure AC conductors carrying up to 750 VAC, 45-450 Hz.

1. Turn the Range Selector Switch to 750 ACV setting.

Always start with the highest range if the voltage is unknown.

2. Plug the red lead into the VΩmA (Center) Jack. Plug the black lead into the

COM (Bottom) Jack. Switch the Multimeter ON.

3. Carefully touch the exposed conductors with the tips of the probes to measure

the voltage (not amperes).

4. Read measurement.

If the voltage is less than 200 volts, set the Range Selector Switch to the

lower range.

5. When testing is complete, remove Test Leads and store with multimeter.

DC Voltage Measurements

Measure DC conductors carrying up to 1000 VDC.

1. Turn the Range Selector Switch to 1000 DCV setting.

2. Follow the directions above under “AC Voltage Measurements”, only use the

DC settings instead.

COM Jack Volt/Ohm/

mA Jack

DC AMP

Selection

Area

DC Volt

Selection

Area

Ohm

Selection

Area

Transistor

Selection

Area

ON/OFF

Switch

Control Layout

10A

Selection

Area/Jack

AC Volt Selection Area

Transistor

/hFE Jack

Diode

Selection Area

Battery

Test

Selection

Area

REV 11/04

SKU 90899 For replacement parts, please call 1-800-444-3353. Page 6

DC Current Measurements

Measure DC conductors carrying up to 10 amperes.

1. Turn the Range Selector Switch to the 10A position.

Always start with the highest range if the amperage is unknown.

2. Plug the red lead into the 10A (Top) Jack. Plug the black lead into the COM

(Bottom) Jack. Switch the Multimeter ON.

3. Carefully touch the exposed conductors with the tips of the probes to measure

the amperage.

Note: Amperage is always tested in series with the circuit under test.

4. Read measurement.

If the reading is less than .2 AMPs, switch the red lead to the VΩmA (Center)

Jack and set the Range Selector Switch to the 200 mA setting.

5. When testing is complete, remove Test Leads and store with multimeter.

Resistance Measurements

Measure circuit resistance up to 2000K Ohms.

WARNING: NEVER measure resistance on a circuit with voltage running through it.

1. Turn the Range Selector Switch to the 200 Ω position.

2. Plug the red Test Lead into the VΩmA (Center) Jack. Plug the black Test

Lead into the Com (Bottom) Jack. Switch the Multimeter ON.

Short the Test Leads together. The meter should read “0” Ohms.

3. Touch the exposed conductors with the tips of the Test Leads.

4. Read measurement.

If the reading is “1”, set the Range Selector Switch to the next higher Ohm

(Ω) position.

Transistor (hFE) Measurements

Test transistors to ensure proper function.

1. Turn the Range Selector Switch to the hFE position.

Switch the Multimeter ON.

2. Insert the transistor pins into the appropriate hFE jack (NPN or PNP) according

to the EBC (Emitter, Base, Collector) sequence.

3. The meter will show the approximate hFE value.

Diode Measurement

Test the voltage drop in diodes.

1. Turn the Range Selector Switch to the Diode ( ) position.

2. Plug the red Test Lead into the VΩmA (Center) Jack. Plug the black Test

Lead into the Com (Bottom) Jack. Switch the Multimeter ON.

3. Connect the red probe to the anode of the diode and the black to the cathode.

SKU 90899 For replacement parts, please call 1-800-444-3353. Page 7

NOTE: No replacement parts are available for this tool.

Battery/Fuse Replacement

To replace the battery or fuse:

1. Remove the Test Leads from the multimeter.

2. Turn the unit over.

3. Remove both screws using a Philips screwdriver.

4. Remove back cover.

5. Pull battery/fuse out of unit and replace with the same.

(9V battery or 500mA/250V fast-acting fuse)

6. Replace cover and retighten screws.

Maintenance

1. Wipe unit with a slightly damp cloth using a light detergent. Do not use solvents

or abrasives.

2. Remove battery if not in use for long periods.

3. Store unit in a dry location.

4. Other than the battery and fuse, there are no replaceable parts on this unit.

Repairs should be done by a qualified technician.

REV 08/04;03/05;12/06

4. The approximate forward voltage drop of the diode will be displayed in

mV. If the connection is reversed only “1” will be shown.

Battery Charge Measurement

Test the amount of charge left in batteries.

NOTE: This setting is for testing the charge of small 9V or 1.5V batteries only.

Never use this setting to test automotive or lead-acid batteries. The high

current could cause damage to the meter and/or cause severe personal injury.

Use the appropriate DC Voltage setting to test the open current voltage of

such batteries instead.

1. Turn the Range Selector Switch to the Battery ( ) position.

2. Plug the red Test Lead into the VΩmA (Center) Jack. Plug the black Test

Lead into the Com (Bottom) Jack. Switch the Multimeter ON.

3. Connect the red probe to the positive terminal of the battery and the black to

the negative terminal.

4. The battery amperage under a load of 370 mΩ will be displayed to a

resolution of .1mA.

5. Normal amperage: For a standard 9V (6LR61) battery = 25 mA

For a 1.5 V “AA” (LR6) battery = 4 mA