Insulation Tester Calibrator • Programmable high voltage high resistance decade box • Resistance range from 10 kΩ to 1 TΩ • Operating voltage range up to 10 kVDC • Grounded or floating operation • Built-in three fix value high voltage capacitors from 10 nF to 100 nF • Built-in monitoring voltmeter • SHORT function for short current testing of UUTs • Timer function for testing of UUTs • Easy recalibration using front panel keypad • GPIB & RS232 interface M191 calibrator is based on programmable high resistance decade with additional electronic circuits allowing calibration of not only resistance ranges, but also calibration of UUT test voltage, short current testing, verifying of functions of measuring dielectric parameters like polarization index (PI), dielectric absorption ratio (DAR) and polarization ratio (PR). The calibrator can be also used to verify timer function of the UUT. Main feature of the calibrator is High resistance source mode. In this mode any resistance value in range from 10 kΩ to 1 TΩ adjustable with 4 digit resolution can be set and connected to the output terminals. Maximum allowed working DC voltage is from range 50 V to 10 000 V depending on set resistance. Switching the resistance value under test voltage is allowed in limited voltage range. In this range it the basic accuracy is 0.1 % to 5 % depending on set resistance value. The calibration can be controlled manually using front panel keypad or in remote mode using one of two types of interfaces GPIB, RS-232. The calibrator can easily fit within calibration systems featuring CALIBER software support. Specification Function HVR (High resistance programmable decade box) Total resistance range: Test voltage range: Maximum applicable voltage during over-switching: Test voltage indication: Test voltage accuracy: Test current indication: Maximum safe DC voltage between H and L terminal: Maximum allowed DC voltage between L and GND terminal: 10.00 kΩ to 1000.0 GΩ 10 000 VDC + 5 % over range 3 000 VDC (without output terminals disconnection) 4 digit meter with range of 10 kVDC with suppressed indication below 50 VDC 0.5 % + 10 V 4 digit meter in range from 0.01 pA

* Accuracy is valid in reference temperature range 23+/ -2 °C with RH < 50 %. ** Test voltage voltmeter function is not available in resistance range from 299.9 GQ to 1 000 GQ. *** Maximum measured DC test voltage is 5 % over the specified range Short test current accuracy: 0.2 % + 5 uA Range of capacitance: 10, 50, 100 nF fix values Calibration value uncertainty: 0.3 % + 200 pF Max. test voltage: 5 000 VDC + 5 % over range Test voltage indication: 0 to 5 000 kVDC with suppressed indication bellow 50 VDC Test voltage accuracy: 0.5 % + 10 V Warm up time: Operating temperature: Reference temperature:...