Elgar SW5250A Service Manual download pdf (Page 40)

CALIBRATION TW SERIES

3-4

Wait for the TW to complete its coupling change to DC. Continue with the following

GPIB commands:

SOUR:VOLT:RANGE LOW

SOUR:SENSE LOCAL

SOUR{1,2,3}:CURR 5.00

SOUR{1,2,3}:VOLT:OFFSET 0.0

SOUR0:VOLT:PROT 200.0

CAL:UNIQ:DCDAC{A,B,C} 0

OUTPUT ON

Wait for the DMM to settle. Record the DMM reading as RDNG1.

Send the following GPIB command:

CAL:UNIQ:DCDAC{A,B,C} 255

Wait for the DMM to settle. Record the DMM reading as RDNG 2.

Calculate the required offset DAC setting.

VALUE1 = (256 * RDNG1) / (RDNG1 – RDNG2)

Set the dc offset calibration register:

OUTPUT OFF

CAL:UNIQ:DCDAC{A,B,C} VALUE1

3.7 DC LOCAL 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 LOCAL

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.

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Elgar SW5250A Service Manual Page 40