Switching the resistance value under test voltage is
allowed limited voltage range. Green LED goes off and the information
field the display shows the following off symbol . The internal voltmeter has one range kV.99 50
100.0 GO. High resistance mode ranges
In HVR mode the calibrator display enables setting only the main resistance value.
- Test current. Displayed value
varies depending set main resistance value range 000 V.9 000 000
500.0 999.999 000 000
10.000 9._________________________________________M191 Insulation Tester Calibrator
4. Test current value calculated according to
formula Itest Utest where set resistance value and Utest measured test voltage.4 HVR High resistance source mode
The calibrator basic function High resistance source mode (HVR).
MEATEST, s.1 1000.999 000 000
10. Calibrator calculates and displays test current. Maximum allowed working voltage is
from range 000 depending set resistance. range from 300. the mode any resistance value range
from 1TO can set and connected the output terminals.0 299.
- Applied test voltage.
During function change, output terminals are always disconnected.00 99.M 000 1500
100.Press the OUTPUT button again disconnect the output terminals.0 999.99 000 000
100.
User Manual v16 15
.99 000 000
20. This value test voltage sourced UUT and connected the calibrator
output terminals.9 250 250
1.0 000 000
Tab II. HVR mode
Following information are displayed the display:
- Set resistance value O.000 9.r. Sign “n/a“ is
displayed instead reading the display line. Reading the test
voltage has suppressed zero band +/- VDC.0 the test voltage not measured.
Calibrator measures continuously test voltage even when output terminals are OFF. Maximum safe test voltage which allowed apply the output terminals.
Fig.0 1000.
- max. Calibrator measures the test voltage when resistance set range from to
300. The resistance partial ranges, absolute voltage limits and maximum applicable
test voltage when the resistance switched over are shown the table:
Resistance range (fi) Vmax Absolute test voltage
(V)
Vo Maximum test voltage for
overswitching (V)
10.00 99.00 19.9 000 000
300.9 000 000
1.o.00 99.99.0 499
