L-Series and FCS-18- Graphical User Interface User Manual
10.3 Output Calibration
Output calibration is used to enhance the accuracy of the programmed
output voltage. A 5½ digit digital true rms AC multimeter is required to
perform this calibration procedure. Recommended equipment is Fluke model
45, Fluke model 884X or HP 34401A.
There is a difference in procedure for each of the two controller types
used in the L-Series. Both are covered here.
10.3.1 P controller
The P controller uses an internal calibration coefficient to calibrate its
output voltage. This means the calibration can be performed without the
need to remove the covers. When the output calibration screen is selected
from the System settings screen, a slider is available to adjust the output
level up or down. Use the AC DMM connected to the external sense leads to
read back the output voltage until it reads 135 ± 0.01 V. (134.99 through
135.01 V)
Note that the output of the L-Series power source will be set to 135 V
automatically by the LSGUI software.
The calibration procedure needs to be performed for all three phases in a
three phase system.
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California Instruments
Rev D – March 2011
