7 HVC High voltage capacitance
In High voltage capacitance function (HVC) the calibrator enables connect the output terminals one three
high voltage capacitors which are built-in the calibrator.
C. Use test leads delivered with UUT whenever possible.
TypicalshortcurrentofUUTs megaohmmetersisseveralmAmax.
G.Notes:
Whenin SHORTmode, groundingoftheLfrontpanel terminal always set ON. Select requested test voltage level UUT.
H._________________________________________M191 Insulation Tester Calibrator
4. Select resistance range UUT necessary. Use only test leads with guaranteed isolation according test voltage
range UUT. Maximum test voltage 000
VDC.
- Test voltage. Connect output terminals the M191 pushing the button OUTPUT ON.
M191 starts measure short current. Select HVC mode pushing repeatedly FUNCTION FUNCTION DOWN button until HVC label
appears the display. UUT starts sourceDCcurrent. Maximum allowed test voltage.
MEATEST, s.
E. Select resistance range UUT necessary. Start UUT measurements, typically pushing ONbutton the UUT.
The calibrator equipped with capacitors with nominal values 10, 50, 100 nF.
F. Set nominal value the requested capacitor using numerical keyboard and
confirmby ENTERbutton. the output terminals currently connected test voltage
- Accuracy the set capacitance %.
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I.
Operating procedure
A.10 High capacitancemode
- Calibration value the selected capacitor
- Vmax. Switch the UUT output OFF remove test voltage fromthe output terminals. terminal connectedto
protection earthpotential. Calibration value the selected position will appear. Compare M191 reading UUT specification.
B. Sense the capacitance function offer tool for
calibration those megaohmmeters and insulation testers which can measure also capacitance.
When HVC mode the display shows information follows:
Fig. Green LEDstarts light. Connect UUT the output terminals. Select requested test voltage level UUT. M191 calibrator measures the short current and displays it.o.r.
D
