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Voltcraft VC190 Manual

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43
c) LoZ AC voltage measurement
TheLoZmeasuringfunctionpermitsalternating“AC”voltagemeasurementswithlowimpedance(approx.300kΩ).
The lower internal resistance of the meter reduces measurement discrepancies such as phantom voltages.
Theinputimpedanceisapproximately300kΩandwillputsomestrainonthecircuit.
1. Set the function dial to LoZ V .
2. Connect the test leads to the terminals:
- Red test lead to the terminal.
- Black test lead to the COM terminal.
3. Connect the test lead probes to the correct test points in the circuit:
- Red: Positive polarity “+”.
- Black: Negative polarity “-”.
4. Read the voltage values on the display.
- The displayed value is true RMS.
- Wait for 3 minutes before next operation.
5. Whennishedmeasuring,disconnectthetestleadsandswitchthepowerOFF
d) Resistance measurement (Ω)
Make sure all circuit parts, circuits, components, and other objects of measurement are disconnected from
the voltage supply and fully discharged..
1. Set the function dial to .
2. Short press the SEL button 4x to select resistance measurement, “Ω” will show on the display.
3. Short press RANGE to toggle through ranges (indicated by decimal position).
4. Connect the test leads to the terminals:
- Red test lead to the terminal.
- Black test lead to the COM terminal.
5. Connect the test lead probes to the correct test points in the circuit:
- Red: Positive polarity “+”.
- Black: Negative polarity “-”.
Checkthelinesforcontinuitybyconnectingthetwotestleads.Theimpedancevalueshouldbe≤0.5Ω
(inherentimpedanceofthemeasuringlines).Ifthevalueis≥0.5Ω,checktheterminalconnectionsorif
there is any damage.
6. Read the voltage values on the display.
- “OL” will appear on the display if the maximum range is exceeded or if the circuit is open.
- When measuring high resistance, it is normal to take a few seconds for readings to stabilize.
7. Whennishedmeasuring,disconnectthetestleadsandswitchthepowerOFF
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