Section 7
7-17
15. Set the current to 0 mA.
16. Remove the 100 k resistor and reconnect the 1 k 0.1% resistor
across Rx C
1
and Rx C
2
.
17. Repeat Steps 4 to 15.
18. Record the voltages and the voltage swings.
19. Remove the 100 k resistor from across Rx C
1
and Rx C
2
and
remove the short from across Rs C
1
and Rs C
2
.
20. Repeat the Primary Current Calibration.
21. Record the voltages.
7.2.4.3.3.High Voltage Check
1. Turn the 6675A Power ON.
2. Enter the Sofcal Diagnostic menu.
3. Using a DMM, monitor the DC voltage at the HIGH VOLTAGE
OUT terminal with respect to. the Rx Ground terminal.
4. Set the mode to "High Ohm" and the speed to "Fast".
5. Set the voltage to 990 V.
NOTE:
There will be a delay when switching to and from “High Ohm “ if
“Volts” is set to a voltage other than 0.
To set the voltage, press the menu key under "More x-x" until the
"Sign/milliAmps/Volts/More 2-4" menu appears. Press the menu
key under "Volts", key in the voltage and press the menu key under
"Volts" again.
6. Ensure that the voltage indicated on the DMM is between 988 V and
992 V. Adjust R321 to set this voltage. If the output is too low,
shunt R321.
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