58542 VXIbus Universal Power Meter
2-22
Publication 21555, Rev. E, September 2002
*TRG
Syntax:
*TRG
Example:
OUTPUT @PWR_MTR;*TRG
! BUS TRIGGER EVENT
Description:
*TRG is an IEEE 488.2 compatible programming command to initiate BUS triggered
measurements. The power meter interprets *TRG as a BUS source for instrument triggering
events. This command will not trigger Peak Power Sensors. It is the same as the TRIG
command.
TRIG
Syntax:
TRIGger[:IMMediate]
Example:
OUTPUT @PWR_MTR;TRIG
! TRIGGER MEASUREMENT CYCLE
Description:
TRIG is the SCPI command form of *TRG. The power meter interprets TRIG as a BUS source
for instrument triggering events. If INIT:CONT is OFF, measurements using FETCh#? will not
proceed until triggering is armed and instrument triggering is actuated.
TRIG:SOUR
Syntax:
TRIGger:SOURce
space
<instrument triggering sourc IMMediate, BUS, HOLD, or EXTernal>
Example:
OUTPUT @PWR_MTR;TRIG:SOUR IMM ! SETS INSTRUMENT MEASUREMENT TRIGGER
! SOURCE TO IMMEDIATE
Description:
TRIG:SOUR IMM sets trigger control to the 58542. BUS triggering sets the triggering control
to the controller software using TRIG or *TRG commands. HOLD halts triggering sequences.
EXTernal sets triggering control to the front panel BNC connector. The following data shows
triggering and operating mode compatibility.
Operating Mode
IMM
BUS
HOLD
EXT
NORMal
X
X
X
SWIFt
X
X
X
BURSt
X
X
If the power meter has been configured for EXT triggering in the BURSt or SWIFt modes and
the operating mode is switched to NORMal, the triggering configuration remains EXT.
However, if the configuration is IMM in NORMal mode and the meter is switched to BURSt, it
automatically switches to BUS. As a general rule, when a measurement subroutine switches
operating modes, send the triggering configuration.
TRIG:MODE
Syntax:
TRIGger:MODE
space
<burst mode data gathering POST trigger receipt or PRE
trigger receipt
>
Example:
OUTPUT @PWR_MTR;TRIG:MODE POST
! SETS BURST OR SWIFT MODE DATA COLLECTION
! RELATIVE TO TIMING OF EVENT TRIGGER POST
Description:
This command is only for BURSt Mode measurements. Send this command only immediately
after CALC#:MODE BURS. TRIG:MODE controls the operation of the FIFO data buffer inside
the power meter. When set to POST, the burst of data points is taken after the receipt of a
valid instrument trigger. When set to PRE, the burst of data is assumed to be those data
points that have arrived immediately preceding the valid instrument trigger event. Using PRE
requires some caution: The single processor in the 58542 is constantly performing data
acquisition. To send any configuration commands while it is collecting the PRE trigger data,
the timing of the data point collection can be interrupted.
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