SERVICE MANUAL
CALIBRATION
3-7
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:LOC:HIR:CURR:OFFSET
VALUE1
Set the TW to 440 volts DC by sending the following GPIB string:
SOUR
{1,2,3}
:VOLT:OFFSET 440
Wait for the DMM to settle. Take a DMM reading and record the value as
RDGN1
.
Query the output voltage of the TW and record the return string as
MEAS1
:
MEAS
{1,2,3}
:VOLT?
Set the TW to -440 volts DC by sending the following GPIB string:
SOUR
{1,2,3}
:VOLT:OFFSET –440
Wait for the DMM to settle. Take a DMM reading and record the value as
RDGN2
.
Query the output voltage of the TW and record the return string as
MEAS2
:
MEAS
{1,2,3}
:VOLT?
Calculate the gains and offset for the phase being calibrated:
GAIN1
= (
MEAS1
–
MEAS2
) / (
RDGN1
–
RDGN2
)
GAIN2
= (880.0) / (
MEAS1
–
MEAS2
)
OFFSET
=
GAIN2
*
MEAS1
– 440.0
Update the TW calibration registers by sending the following GPIB strings:
CAL
{1,2,3}
:MEAS:LOC:HIR:VOLT:GAIN
GAIN2
CAL
{1,2,3}
:OUTP:LOC:HIR:VOLT:GAIN
GAIN1
CAL
{1,2,3}
:OUTP:LOC:HIR:VOLT:OFFSET
OFFSET
Reset the TW’s output to a safe condition:
SOUR
{1,2,3}
:VOLT:OFFSET 0.0
OUTPUT OFF
Summary of Contents for TrueWave TW5250
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