External Gain Control Calibration - Cal Power TrueWave TW5250 Service Manual

SERVICE MANUAL
Set the TW frequency to 60 Hz and open the output via the GPIB:
SOUR:FREQ 60.0
OUTP OFF
Calculate the phase offset calibration data:
VALUE1 = -1.0 * RDGN1
VALUE2 = -1.0 * RDGN2
VALUE3 = -1.0 * RDGN3
VALUE4 = -1.0 * RDGN4
VALUE5 = -1.0 * RDGN5
Update the calibration data via the GPIB:
CAL:UNIQ:OPHAC VALUE1 VALUE2 VALUE3 VALUE4 VALUE5
Calculate the phase angle readback calibration data:
VALUE1 = -1.0 * (RDGN1 + MEAS1)
VALUE2 = -1.0 * (RDGN2 + MEAS2)
VALUE3 = -1.0 * (RDGN3 + MEAS3)
VALUE4 = -1.0 * (RDGN4 + MEAS4)
VALUE5 = -1.0 * (RDGN5 + MEAS5)
Update the calibration data via the GPIB:
CAL:UNIQ:MOPHAC VALUE1 VALUE2 VALUE3 VALUE4 VALUE5

3.18 EXTERNAL GAIN CONTROL CALIBRATION

Connect the DC power supply to the external analog in BNC of the TW. Connect the
DMM to phase A of the TW. Set the DC power supply to 2.000 ± 0.005 volts. Setup
the DMM for AC volts.
Setup the TW with the following GPIB commands:
SOUR:VOLT:RANGE LOW
SOUR:SENSE REMOTE
SYST:EXT:GAIN 1
SOUR{1,2,3}:CURR 5.00
SOUR{1,2,3}:VOLT 100.0
OUTPUT ON
Wait for the DMM to settle and record the value as RDNG1.
Set the DC power supply to 8.000 ± 0.005 volts.
CALIBRATION
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