Frequency (Hz) Measurements
Frequency is the number of cycles a signal completes each second. The meter
measures the frequency of a voltage or current signal by counting the number of
times the signal crosses a threshold level each second.
To measure t he frequency of a voltage or current signal, press the Hz/Duty button
momentarily while measuring volts or currents.
The available frequency ranges are 5 Hz, 50 Hz, 500 Hz, 5 kHz, 50 kHz, 500 kHz,
5 MHz and 10 MHz.
Diode ( ) Test
Use t he diode test to check diodes, transistors, silicon controlled rect ifiers (SCRs),
and ot her semic onduct or dev ic es. T he t est s ends a curr ent thr ough a
semiconductor junction, then measures the junction’s volt age drop.
Normal forward volt age drop (forward biased) for a good silicon diode is between
0.4 V to 0. 9 V. A reading higher t han that indicates a leaky (defective) diode. A
zero reading indicates a shorted (defective) diode.
An indicates an open diode (defect ive).
Reverse the test leads connect ions ( reverse biased ) across t he diode.
The display shows
if the diode is good. Any other readings indicate the diode
is shorted or resistive ( defect ive ).
Continuity ( ) Test
The continuity function detects intermit tent opens and shorts lasting as little as 1
millisecond. These brief contacts cause t he meter to emit a short beep. This
function is convenient for checking wiring connections and operation of switches.
A continuous beep tone indicates a complete wire.
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Caution
Discharge all high-voltage capacitors before testing diodes.
Large value capacit ors should be dis charged t hrough an
appropriate resistance load.
Caution
Using resist ance and cont inuity function in a live circuit will
produce false results and may damage the instrument.
I n many cas es t he s uspic ious c omponent s mus t be
disconnect ed from t he circuit under test to obt ain accurate
results.
