Dc Remote Low Range Calibration - Cal Power TrueWave TW5250 Service Manual

CALIBRATION

3.9 DC REMOTE LOW RANGE CALIBRATION

Both the measurement and output subsystems are calibrated at the same time.
Connect the DMM to the output phase of the TW to be calibrated. Set the DMM for
auto–ranging volts DC. Send the following GPIB commands to the TW:
OUTPUT OFF
OUTP:COUP DC
Wait for the TW to complete its coupling change to DC. Continue with the following
GPIB command:
SOUR:VOLT:RANGE LOW
SOUR:SENSE REMOTE
SOUR{1,2,3}:CURR 5.00
OUTPUT ON
SOUR{1,2,3}:VOLT:OFFSET 0.0
Wait for the DMM to settle and record the value as RDGN1.
Send the following query command to the TW and record the return string as MEAS1:
MEAS{1,2,3}:VOLT?
Calculate the offset value:
VALUE1 = RDGN1 – MEAS1
Send the offset value to the TW:
CAL{1,2,3}:MEAS:REM:LOR:VOLT:OFFSET VALUE1
Measure the current offset by sending the following GPIB query and record the return
string as MEAS1:
MEAS{1,2,3}:CURR?
Calculate the offset value:
VALUE1 = -1.0 * MEAS1
Send the calculated offset to the TW:
CAL{1,2,3}:MEAS:REM:LOR:CURR:OFFSET VALUE1
Set the TW to 220 volts DC by sending the following GPIB string:
SOUR{1,2,3}:VOLT:OFFSET 220
3-8
TW SERIES