SERVICE MANUAL
CALIBRATION
3-9
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 -220 volts DC by sending the following GPIB string:
SOUR
{1,2,3}
:VOLT:OFFSET –220
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
= (440.0) / (
MEAS1
–
MEAS2
)
OFFSET
=
GAIN2
*
MEAS1
– 220.0
Update the TW calibration registers by sending the following GPIB strings:
CAL
{1,2,3}
:MEAS:REM:LOR:VOLT:GAIN
GAIN2
CAL
{1,2,3}
:OUTP:REM:LOR:VOLT:GAIN
GAIN1
CAL
{1,2,3}
:OUTP:REM:LOR:VOLT:OFFSET
OFFSET
Reset the TW’s output to a safe condition:
SOUR
{1,2,3}
:VOLT:OFFSET 0.0
OUTPUT OFF
3.10 DC REMOTE HIGH 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 this command:
SOUR:VOLT:RANGE HIGH
SOUR:SENSE REMOTE
SOUR
{1,2,3}
:CURR 5.00
OUTPUT ON
SOUR
{1,2,3}
:VOLT:OFFSET 0.0
Summary of Contents for TrueWave TW1750
Page 2: ......
Page 4: ...ii This page intentionally left blank ...
Page 10: ...TABLE OF CONTENTS TW SERIES viii This page intentionally left blank ...
Page 36: ...MAINTENANCE AND TROUBLESHOOTING TW SERIES 2 16 This page intentionally left blank ...
Page 80: ...CALIBRATION TW SERIES 3 44 This page intentionally left blank ...