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Diode Test
Model 20250-51 (continued):
6. The diode or junction can be evaluated as follows:
A. If one reading shows a value and the other reading
shows “OL”, the diode is good.
B. If both readings show “OL”, the device is open.
C. If both readings are very small or 0, the device is
shorted.
NOTE: The value indicated in the display during the diode
check is the forward voltage.
Frequency or % Duty Cycle Measurements
(Model 20250-51 only)
1. Set the rotary function switch to the Hz% position.
2. Insert the black lead banana plug into the negative
COM jack and the red test lead banana plug into the
positive Hz jack.
3. Press the MODE button to select “Hz” or “%”.
4. Touch the test probe tips to the circuit under test.
5. Read the frequency or % of duty cycle on the display.
Capacitance Measurement (Model 20250-51 only)
WARNING: To avoid electric shock, disconnect power
to the unit under test and discharge all capacitors
before taking any capacitance measurements. Remove
the batteries and unplug the line cords.
1. Set the function switch to the CAP position. “nF” and a
small value will appear in the display.
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