User and Programming Manual - Rev P
California Instruments
6. Calibration
Routine calibration should be performed every 12 months. Non-routine calibration is only
required if a related assembly is replaced or if the periodic calibration is unsuccessful.
The calibration involves removing the top cover from the power source. Remove the line
power from the power source before removing the top cover. Some of the adjustments are
on the Oscillator Assembly A4. Other adjustment are on the DC-AC Board Assembly. Refer
to Figure 6-3 for the location of the adjustments.
6.1. Calibration
Equipment
Digital Multimeter:
Fluke 8840 or HP 34401A
100 milliohm Current Shunt:
Isotek Model RUG-Z-R100-0.1 or equivalent
Load Bank:
Various power load resistors will be needed
Table 2: Load and current
Model
Range Current
max
Load
801RP 135V 6.0A 22.5
Ω
801RP 270V 3.0A 90.0
Ω
1251R
P
135V 9.2A 14.6
Ω
1251R
P
270V 4.6A 58.6
Ω
6.2. Routine
Calibration
Setup:
Connect the test equipment to the power source as shown in Figure 6-1. Refer to Figure 6-3
for adjustment locations.
The DMM can be connected to the front panel connectors for convenience but will have to
be changed when switching voltage ranges. To avoid this, use the common output terminal
at the rear of the unit.
For best results use the output connectors (Front or Rear) that are typically used.
October 2005
RP Series
24