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