6CP100/50-10
6-1
SECTION 6: CALIBRATION
All calibrations have been done at the factory. Periodic calibration of the output voltmeter and output
currentmeter should be done annually.
NOTE: Refer to Electrical Diagram Section for schematics pertaining to the model number of your test set.
Locating the Calibration Adjustments
The calibration points are shown in the following diagram.
1. Output Voltmeter
Connect a precision high voltage voltmeter across the output to ground on 50 kV output, with
Measurement Divider switch set to 50 kV. Raise the output to approximately 80% of the output rating.
Adjust the reading on the panel meter (M2) by means of potentiometer R17 to a corresponding reading.
Repeat procedure with precision high voltage voltmeter connected between the 100 kV output and
ground with the Measurement Divider switch set to 100 kV. Adjust R19 to match precision voltmeter at
80% of output rating.
2. Output Currentmeter
It is necessary to connect adequately rated High Voltage loads (isolated from ground) to the high voltage
unit that will allow each full range current to be drawn at approximately 15% or higher output voltage.
This allows sufficient resolution to adjust current levels. All ranges can be calibrated from 50 kV output.
Place Binding Post Configuration in GUARD MODE. (Jumper clip is installed between “GRD” and “GND”
posts.)
Connect a precision ammeter between the low potential side of the appropriate high voltage load and the
“RTN” post. Select the 200 uA meter range. Raise the output to approximately 80% of the range rating.
Adjust the reading on the panel meter (M1) by means of potentiometer R78 to a corresponding reading.
Repeat for 2 mA, 20 mA and 200 mA ranges adjusting R80, R82 and R84, respectively. (High Voltage
load will need to change when changing range).
NOTE: An optional method is to use current injection between RTN and GND (Guard Mode).
Do not turn High Voltage on for this method!
CAUTION:
Calibration should only be done by persons familiar with High Voltage testing and safety
procedures.
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