Series 8650B Universal Power Meters
3-28
Publication 31470-001, Rev C, November 2, 2017
*TRG
Syntax:
*TRG
Example:
*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.
TRIGger
Syntax:
TRIGger[:IMMediate]
Example:
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 and TRIG:SOUR is BUS, measurements
using FETCh#? will not proceed until triggering is armed (using INIT) and instrument triggering
is actuated (using TRIG).
TRIGer:SOURce
Syntax:
TRIGger:SOURce
space
<instrument triggering source IMMediate, BUS, HOLD, or EXTernal>
Example:
TRIG:SOUR IMM
! SETS INSTRUMENT MEASUREMENT TRIGGER
! SOURCE TO IMMEDIATE
Description:
TRIG:SOUR IMM sets trigger control to the 8650B. 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 rear-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 EXTernal 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 required triggering configuration.
TRIGger:MODE
Syntax:
TRIGger:MODE
space
<burst mode data gathering POST trigger receipt or PRE trigger receipt
>
Example:
TRIG:MODE POST
! SETS THE BURST MODE DATA COLLECTION RELATIVE TO
! THE TIMING OF THE EVENT TRIGGER TO POST
Description:
This command is only for GPIB 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 8650B is constantly performing data
acquisition. Sending any configuration commands while collecting the PRE trigger data can
result in interrupted timing of the data point collection.
Содержание 8650B Series
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