Amprobe AMP-210, User Manual

12

Measuring Resistance, Continuity and Diode

W

 Warning

•  To avoid false readings that can lead to electrical shock and injury, de-

energize the circuit before taking the measurement.

•  To avoid electrical shock when testing resistance/continuity/diode in a 

circuit, make sure the power to the circuit is turned off and all capacitors 

are discharged. Use DC voltage function to check the capacitors are 
discharged.

1. Connect the black test lead to the COM terminal and the red test lead 

to the 

Ω

 terminal.

2. Turn the rotary switch to 

.

3. Press SELECT button for desired measurement function.
4. Connect the probes across the circuit or component to be tested.
 

Resistance measurement: 

The resistance reading appears on the display. 

If the circuit is open or resistance exceeds the Meter’s range, the display 
reads “OL”.

Continuity measurement:

 If the circuit is shorted, the Meter beeps and 

shows a reading 

≤

 10 

Ω

. (Beeper ON 

≤

 10 

Ω

, OFF > 250 

Ω

) If the circuit is 

open or resistance exceeds the Meter’s range, the display reads OL.

Testing diode:

 When testing diode, normal forward voltage drop 

(forward biased) for a good silicon diode is between 0.400V to 0.900V. 
A reading higher than that indicates a leaky diode (defective). A zero 
reading indicates a shorted diode (defective). Display reads “OL” 
indicates an open diode (defective). Reverse the test leads connections 
(reverse biased) across the diode. The display reads “OL” if the diode 
is good. Any other readings indicate the diode is resistive or shorted 
(defective).