M191 Insulation Tester Calibrator MEATEST. M191
milliampermeter has one range mAwith five-digit resolution this mode. Use test leads delivered with UUT whenever possible. Connect output terminals the M191 pushing the button OUTPUT ON. s. UUT starts source current. M191 measures test current sourced UUT under short circuit condition.
C. Green LED starts light.
D. M191 calibrator measures the short current and displays it. Nominal input resistance 2.r.6 SHORT Short current mode
Short current mode (SHORT) designed enable verification short current capability UUTs -
megaohmmeters. Select SHORT mode pushing repeatedly FUNCTION FUNCTION DOWN button until SHORT label
appears the display. Select requested test voltage level UUT.
F.
E.
Display shows information follows:
Fig.
G. Compare M191 reading UUT specification. Connect UUT the output terminals. Switch the UUT output OFF remove test voltage fromthe output terminals.5 kQ.
B.
Be aware that the test voltage for high resistance
measurements dangerous and can cause
electric shock!
Testleads deliveredwiththe calibratorareapprovedforapplication upto5kVDC.
4. Disconnect M191 output terminals using the button OUTPUT ON.
H.
Operating procedure
A. Select resistance range UUT necessary.
I.
M191 starts measure short current. Use only test leads with guaranteed isolation according test voltage
range UUT. Activate UUT measurement, typically pushing button the UUT. Usetestleads deliveredwith
UUTsforhighertest voltages.9 SHORT mode
- Measured short current mA
- Accuracy the measured value %.
18 User Manual
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