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Voltcraft VC190 Manual

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g) Capacity measurement
Make sure all circuit parts, circuits, components, and other objects of measurement are disconnected from
the voltage supply and fully discharged.
Always observe polarity with electrolyte capacitors.
1. Set the function dial to .
2. Short press the SEL button 1x to select capacity measurement, “nF” unit or capacitance will show on the display.
3. Connect the test leads to the terminals:
- Red test lead to the terminal.
- Black test lead to the COM terminal.
4. Connect the test lead probes to the correct test points on the capacitor.
- Always observe the polarity with electrolyte capacitors.
- “OL” will appear on the display if the polarity is reversed or if the circuit is shorted.
- Wait until the displayed value has stabilized. This may take a few seconds for capacities >40 µF.
5. Whennishedmeasuring,disconnectthetestleadsandswitchthepowerOFF.
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 button to switch between frequency “Hz” and duty ratio “%” measurement.
Frequency measurements: Short press RANGE to toggle through ranges (indicated by decimal position).
3. Connect the test leads to the terminals:
- Red test lead to the terminal.
- 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 positive half wave is displayed as a percentage. 50% is displayed for
a symmetrical signal.
5. Whennishedmeasuring,disconnectthetestleadsandswitchthepowerOFF.
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