Cal Power TrueWave TW5250, Руководство по обслуживанию

Страница: 67 / 84

SERVICE MANUAL CALIBRATION
3-31
Turn the TW’s output off via the GPIB:
OUTP OFF
Calculate the gain and offset values for updating the TW:
GAIN = ( RDGN2 – RDGN1 )/( MEAS2 – MEAS1 )
OFFSET = RDGN2 – GAIN * MEAS2
Update the TW’s gain and offset calibration values with the following GPIB strings:
CAL {1,2,3} :MEAS:REM:LOR:WATT:GAIN GAIN
CAL {1,2,3} :MEAS:REM:LOR:WATT:OFFSET GAIN
3.22 LOW RANGE CURRENT FREQUENCY CALIBRATION
Connect the 12 ohm resistor to the output of the TW through the power analyzer. Set
up the power analyzer to measure current.
Set up the TW to AC coupling, low range, remote 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 REMOTE
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 current reading as RDNG1 .
Query the TW’s current using the GPIB string below, and record this value as MEAS1 .
MEAS {1,2,3} :CURR?
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 current reading as RDNG2 .
Query the TW’s current using the GPIB string below, and record this value as MEAS2 .
MEAS {1,2,3} :CURR?