Operating procedure
A.Notes:
Whenin SHORTmode, groundingoftheLfrontpanel terminal always set ON.
D. UUT starts sourceDCcurrent. Switch the UUT output OFF remove test voltage fromthe output terminals.
TypicalshortcurrentofUUTs megaohmmetersisseveralmAmax.
When HVC mode the display shows information follows:
Fig. Select requested test voltage level UUT. Use test leads delivered with UUT whenever possible. Connect output terminals the M191 pushing the button OUTPUT ON. Select resistance range UUT necessary. the output terminals currently connected test voltage
- Accuracy the set capacitance %.
M191 starts measure short current.
G.
H. Connect UUT the output terminals. Sense the capacitance function offer tool for
calibration those megaohmmeters and insulation testers which can measure also capacitance.10 High capacitancemode
- Calibration value the selected capacitor
- Vmax.
User Manual v16 19
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C.
MEATEST, s. Maximum allowed test voltage._________________________________________M191 Insulation Tester Calibrator
4. Start UUT measurements, typically pushing ONbutton the UUT. Use only test leads with guaranteed isolation according test voltage
range UUT.
E.
- Test voltage. terminal connectedto
protection earthpotential. Calibration value the selected position will appear.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.
I. M191 calibrator measures the short current and displays it.
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. Maximum test voltage 000
VDC.o. Green LEDstarts light. Compare M191 reading UUT specification. Select requested test voltage level UUT.r. Select HVC mode pushing repeatedly FUNCTION FUNCTION DOWN button until HVC label
appears the display.
B. Select resistance range UUT necessary
