Program Examples
Publication 21555, Rev. E, September 2002
A-7
A.3
Sensor Zeroing Examples
A.3.1
Sensor Zeroing Example 1
The following example requests that the operator turn off the signal source or disconnect the sensor
from the source prior to zeroing. It is preferable to disable the source and leave the sensor attached to the
measurement port for proper zeroing. If the source cannot be disabled, use a switch or attach a connector
to the grounded metal near the DUT measurement port. DO NOT attach the sensor to the power
meter’s calibrator port.
The zeroing offset process will account for the DUT’s ground plane noise and
thermal emf, not the power meter’s.
410
ASSIGN @Pwr_mtr to 70101
420
CLEAR @Pwr_mtr
430
WAIT 1
440
INPUT Disable the source’s RF output or attach it to a grounded connector. Then hit ENTER.,Dmy
450
PRINT Zeroing Sensor 1
460
OUTPUT @Pwr_mtr;CAL1:ZERO?
470
ENTER @Pwr_mtr;Pass_zer
480
IF Pass_zer=0 THEN PRINT Zeroing Passed
490
IF Pass_zer=1 THEN
500
PRINT Zeroing FAILED, Source turned off?
550
ELSE
560
IF Pass_zer<>0 THEN PRINT Strange Response to CAL1:ZERO?. Clear output Queue?
570
END IF
580
!
A.3.2
Sensor Zeroing Example 2
The following program turns off the signal source, zeros the power sensor, reports a pass/fail indicator
upon completion, and turns the source back on.
400
ASSIGN @Pwr_mtr to 70101
410
ASSIGN @Source to 70102
420
CLEAR @Pwr_mtr
430
WAIT 1
440
OUTPUT @Source RF0! Turns source output power off (<-90 dBm).
450
PRINT Zeroing Sensor 1
460
OUTPUT @Pwr_mtr;CAL1:ZERO?
470
ENTER @Pwr_mtr;Pass_zer
480
IF Pass_zer=0 THEN PRINT Zeroing Passed
490
IF Pass_zer=1 THEN
500
Ques$=Zeroing FAILED, Source turned off?
510
OUTPUT @Pwr_mtr;SYST:ERR?
520
ENTER @Pwr_mtr;Err_msg$! Reading an error message clears it.
530
PRINT Err_msg$
540
PRINT Ques$
550
ELSE
560
IF Pass_zer <>0 THEN PRINT Strange Response to CAL1:ZERO?. Clear output Queue?
570
END IF
580
!
590
OUTPUT @Source RF1! Turns source output power back on.
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