Elgar SW5250A Service Manual download pdf (Page 69)

SERVICE MANUAL CALIBRATION

3-33

3.23 LOCAL LOW RANGE WATTS FREQUENCY CALIBRATION

Connect the 12 ohm resistor to the output of the TW through the power analyzer. Set

up the power analyzer to measure watts.

Set up the TW to AC coupling, low range, local sense, 40 Hz, 13 ampere current limit,

output relay closed and 120 volts with the following GPIB programming strings:

OUTP:COUP AC

SOUR:VOLT:RANGE LOW

SOUR:SENSE LOCAL

SOUR:FREQ 40

SOUR{1,2,3}:CURR 13.00

OUTPUT ON

SOUR{1,2,3}:VOLT 120

Wait until the power analyzer has stabilized and record the watts reading as RDNG1.

Query the TW’s watts using the GPIB string below, and record this value as MEAS1.

MEAS{1,2,3}:POW?

Program the TW to 80 Hz using the string below:

SOUR{1,2,3}:FREQ 80

Wait until the power analyzer has stabilized and record the watts reading as RDNG2.

Query the TW’s watts using the GPIB string below, and record this value as MEAS2.

MEAS{1,2,3}:POW?

Program the TW to 160 Hz using the string below:

SOUR{1,2,3}:FREQ 160

Wait until the power analyzer has stabilized and record the watts reading as RDNG3.

Query the TW’s watts using the GPIB string below, and record this value as MEAS3.

MEAS{1,2,3}:POW?

Program the TW to 320 Hz using the string below:

SOUR{1,2,3}:FREQ 320

Wait until the power analyzer has stabilized and record the watts reading as RDNG4.

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Elgar SW5250A Service Manual Page 69