Cal Power TrueWave TW5250, Service Manual

Page: 55 / 84

SERVICE MANUAL CALIBRATION
3-19
Query the TW’s output put voltage with the GPIB string below and record this value as
MEAS5 .
MEAS {1,2,3} :VOLT?
Set the TW’s frequency to 60 Hz and open the output with the following GPIB
commands:
SOUR:FREQ 60.0
OUTP OFF
Calculate the measurement system frequency compensation values:
VALUE1 = RDGN1 / MEAS1
VALUE2 = RDGN2 / MEAS2
VALUE3 = RDGN3 / MEAS3
VALUE4 = RDGN4 / MEAS4
VALUE5 = RDGN5 / MEAS5
Update the TW’s calibration data with the following GPIB command:
CAL {1,2,3} :MEAS:REM:LOR:VOLT:FREQCAL VALUE1 VALUE2 VALUE3 VALUE4 VALUE5
3.14 REMOTE HIGH RANGE FREQUENCY CALIBRATION
Connect the TW output to the DMM. Set the DMM up for auto–ranging AC voltage.
Set the TW into AC coupling, remote sense, 40 Hz, 120V, and high range by sending
the following GPIB strings:
OUTP:COUP AC
SOUR:VOLT:RANGE HIGH
SOUR:SENSE REMOTE
SOUR:FREQ 40.0
SOUR
{1,2,3} :VOLT 240.00
Close the TW’s output relay:
OUTPUT ON
Wait for the DMM to settle and record the voltage as MEAS1 .
Set the TW to 80 Hz.
SOUR:FREQ 80.0
Wait for the DMM to settle and record the voltage as MEAS2 .