Frequency (>10 Hz) / Duty Ratio Measurement (%) - VOLTCRAFT VC191 Bedienungsanleitung

h) Frequency (>10 Hz) / duty ratio measurement (%)
This measuring function is not suitable for measuring mains current!
The DMM can be used to measure and indicate signal voltage frequencies up to 1
MHz.
The maximum input amplitude is 30 Vrms.
Please observe the input values in the technical data.
1. Set the function dial to Hz%, Hz will appear on
the display.
2. Short press the SEL/PEAK button to switch be-
tween frequency "Hz" and duty ratio "%" meas-
urement.
3. Connect the test leads to the terminals:
- Red test lead to the
- Black test lead to the COM terminal.
4. Connect the test lead probes to the correct test
points in the circuit.
Duty ratio: The pulse duration of the posi-
tive half wave is displayed as a percentage.
50% is displayed for a symmetrical signal.
5. When finished measuring, disconnect the test
leads and switch the power OFF.
56
terminal.