6CP50/10-3
6-2
CALIBRATION
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.
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 200µA currentmeter range. Raise the output to approximately 80% of the
range. Adjust the reading on the panel meter (M1) by means of potentiometer R204 to a corresponding
reading. Repeat for 2mA, 20mA and 300mA ranges adjusting R203, R202 and R201, respectively.
(High Voltage load will need to change when changing range).
An optional method is to use current injection between RTN and GND (Guard Mode). Do not turn High
Voltage On for this method!
3. Overcurrent
This calibration should not need adjustment (factory adjusted). If the overcurrent circuit is out of
calibration, perform the following steps.
a. With unit off, short the output terminal to ground through an appropriate currentmeter. NOTE: A
High Voltage Load will give better resolution and make calibration easier.
b. Set the Current Trip potentiometer on the front panel to "1" and current range switch to High.
c. Turn on HV On and adjust the output current slowly until 10% of rated current (check nameplate) is
displayed on the currentmeter.
d. Adjust potentiometer R101 until the Reset lamp illuminates and high voltage is shut off.
e. Set the Current Trip potentiometer on front panel to "11."
f. Turn on HV On and adjust the output current slowly until 110% of rated current is displayed on
meter.
g. Adjust potentiometer R103 until the Overload lamp illuminates and high voltage is shut off.
h. Repeat steps a through g as necessary until both settings are calibrated.
4. Range Overcurrent. R235 sets an overcurrent for the ranges and should be set to trip at approximately
110% of full range current on medium range setting with current trip potentiometer set at “11.”
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