Frequency Measurement; Duty Cycle - VOLTCRAFT VC-20 Bedienungsanleitung

The voltage range „V DC/AC" shows an input resistance
of >7.5 MOhm. As soon as a minus „-" appears for direct
voltage in front of the measured value, the measured
voltage is negative (or the measuring leads have been
mixed up).
b) Frequency measurement
The DMM can be used to measure and indicate signal voltage fre-
quencies.
Proceed as follows to measure frequencies:
- Turn the DMM on at the rotary switch (1) and
select measuring range „V Hz %". Press „Hz
%" (9) to change to the frequency range. The
display reads „Hz".
- Now connect the two test prods with the object to be measured
(signal generator, circuit etc.).
- The frequency and corresponding unit are displayed.
c) Duty cycle
The duty cycle function determines the ratio of the positive half-wave
of a signal voltage to the entire signal waveform within a certain period
in percent.
Proceed as follows to measure the duty cycle:
- Turn the DMM on at the rotary switch (1) and
select measuring range „V Hz %". Press
„Hz %" (9) twice to switch to duty cycle mode.
The display indicates „%".
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