Elgar SW5250A Service Manual download pdf (Page 44)

CALIBRATION TW SERIES

3-8

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

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Elgar SW5250A Service Manual Page 44