Giga-tronics 58542 - Instrument Triggering Examples; Triggering Example 1; Triggering Example 2

58542 VXIbus Universal Power Meter
A-22 Publication 21555, Rev. E, September 2002
A.5 Instrument Triggering Examples
A.5.1 TRIGgering Example 1
The following two programs illustrate the operation of TRIG:SOUR HOLD with the MEAS#? and
FETCh#? measurement data queries. This first program shows TRIG:SOUR HOLD used with MEAS#?.
Since MEAS#? is a high level command containing it’s own trigger sequence arming, triggering, and
measurement data acquisition functions, the program returns valid measurement data. The output from
the SYST:ERR query is -0, No error.
260 ASSIGN @Pwr_mtr to 70101
270 CLEAR @Pwr_mtr
275 WAIT 1
280 OUTPUT @Pwr_mtr;*CLS ! Clears old messages from SYST:ERR buffer
290 WAIT 0.3
300 OUTPUT @Pwr_mtr;CALC1:MODE NORM! NORMal Mode.
310 OUTPUT @Pwr_mtr;CALC1:POW 1 ! Channel 1 configured to measure sensor 1 power
320 OUTPUT @Pwr_mtr;SENS1:CORR:FREQ 1.44E9
! Applies Cal Factor for 1.44 GHz to data.
330 !
340 OUTPUT @Pwr_mtr;TRIG:SOUR HOLD ! Halts triggering when used with FETCh#?
350 !
360 FOR I=1 TO 10
370 OUTPUT @Pwr_mtr;MEAS1? ! MEAS#? returns valid data with TRIG:SOUR set to HOLD.
380 ENTER @Pwr_mtr;Rdg
390 PRINT Rdg
400 NEXT I
410 !
420 OUTPUT @Pwr_mtr;SYST:ERR? ! Query error buffer
430 ENTER @Pwr_mtr;A$
440 PRINT A$
530 END
A.5.2 TRIGgering Example 2
When FETCh#? is used while TRIG:SOUR is HOLD, invalid data, 9.e+40, is returned and the
SYST:ERR? query returns -230, Data corrupt or stale.
260 ASSIGN @Pwr_mtr to 70101
270 CLEAR @Pwr_mtr
275 WAIT 1
280 OUTPUT @Pwr_mtr;*CLS ! Clears old messages from SYST:ERR buffer
290 WAIT 0.3
300 OUTPUT @Pwr_mtr;CALC1:MODE NORM ! NORMal Mode.
310 OUTPUT @Pwr_mtr;CALC1:POW 1 ! Channel 1 configured to measure sensor 1 power
320 OUTPUT @Pwr_mtr;SENS1:CORR:FREQ 1.44E9
! Applies Cal Factor for 1.44 GHz to data.
330 !
340 OUTPUT @Pwr_mtr;TRIG:SOUR HOLD ! Halts triggering when used with FETCh#?
350 !
360 FOR I=1 TO 10
370 OUTPUT @Pwr_mtr;FETC1? ! FETC#? will not acquire valid data when TRIG:SOUR
! is set to HOLD.
380 ENTER @Pwr_mtr;Rdg
390 PRINT Rdg
400 NEXT I
410 !
420 OUTPUT @Pwr_mtr;SYST:ERR? ! Query error buffer
430 ENTER @Pwr_mtr;A$
440 PRINT A$
530 END