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SKU 90939

Page 6

DC Current Measurements

Measure DC conductors carrying up to 10 amperes.

1.

Turn the Range Selector Switch to the       position.
Always start with the highest range if the amperage is unknown.

2.

Plug the red lead into the 10A (Right) Jack. Plug the black lead into the COM
(Center) Jack.

3.

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

4.

Read measurement.
If the reading is less than .2 AMPs,switch the red lead to the Left AMP Jack
and set the Range Selector Switch to the 200 mA    setting.

5.

Optionally, press the Data Hold button to keep the display reading the same
after the leads have been removed from the conductors.  Press and release
the Data Hold button again to resume normal operation.

6.

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

Resistance Measurements

Measure circuit resistance up to 20M Ohms.

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

1.

Turn the Range Selector Switch to the 200 

 position.

2.

Plug the red Test Lead into the Ohms (Left) Jack. Plug the black Test Lead
into the Com (Center) Jack.
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 (

)

position.

5.

Optionally, press the Data Hold button to keep the display reading the same
after the leads have been removed from the conductors.  Press and release
the Data Hold button again to resume normal operation.

Transistor(hFE)/LED Measurements

Test transistors and LEDs to ensure proper function.

1.

Turn the Range Selector Switch to the NPN or PNP position depending on
what type of transistor is to be tested.  To test a LED use the NPN position.

For Transistors:

a. Insert the transistor pins into the hFE jack according to the EBC (Emitter,

Base, Collector) sequence.

b. The meter will show the approximate hFE value.

...

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10A

20

Summary of Contents for 90939

Page 1: ...3491 Mission Oaks Blvd Camarillo CA 93011 Visit ourWeb site at http www harborfreight com Copyright 2004 by Harbor FreightTools 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 90939 ...

Page 2: ...2 2 e g a t l o V C D V 0 0 6 0 0 2 0 2 2 s e g n a R y c a r u c c A t i g i d 1 5 1 V 0 0 6 0 0 2 0 2 t i g i d 1 5 0 V 2 e g a t l o V C A V 0 0 6 0 0 2 s e g n a R y c a r u c c A t i g i d 3 5 2 V 0 0 6 t i g i d 3 2 z H 0 0 5 0 4 V 0 0 2 e c n a t s i s e R 5 1 m h O M 0 2 M 2 K 0 0 2 K 0 2 K 2 0 0 2 s e g n a R y c a r u c c A t i g i d 2 2 m h O 0 0 2 t i g i d 2 5 1 m h O M 2 K 0 0 2 0 2 ...

Page 3: ... tools and keep out of reach of children 9 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 10 Use eye protection Always wear ANSI approved impact safety goggles 11 Do not overreach Keep proper footing and bala...

Page 4: ...riptions 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 ma...

Page 5: ...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 Optionally press the Data Hold button to keep the display reading the same after the leads have been removed from the conductors Press and release the Data Hold button again to resume normal operation 6 When te...

Page 6: ... 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 Ohms Left Jack Plug the black Test Lead into the Com Center Jack 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 s...

Page 7: ...eck for wire continuity or resistance using the Test Leads and Ohms function Distribution transformers Measure load on each phase for balance and for excessive current Motors Measure starting current running current and current imbalance between phases Variable speed motor controllers Measure input and output currents Maintenance 1 Wipe unit with a slightly damp cloth using a light detergent Do no...

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