Cal Power TrueWave TW1750, Service Manual

Page: 69 / 84

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 .