Giga-tronics 8650A Series, Operation Manual

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Remote Operation
Manual 31470, Rev. E, April 2001 3-21
TRIG:COUN
Syntax : TRIGger:COUNt space <number of data values to buffer in memory from 1 to 5000 for
the standard 8650; from 1 to 128,000 on one channel with option 02; and 1 to 64000 for
two channels with option 02>
Example : OUTPUT @Pwr_mtr;TRIG:COUN 100 ! Set Burst or Swift mode buffer reading
! number to 100
Description: The power meter has an internal and expandable data buffer for storing measurement
data until the slot 0 controller/resource manager is ready to read the data. During the
SWIFt or BURSt modes, this command controls the number of power readings that are
stored in the 8650A data buffer.
The value specified here applies to each individual channel. That is, if two sensors are
attached and calibrated, the 8650A will perform the specified measurement and buffering
for both channels. In the example shown below for this command, that would be 100
points per channel. Option 02 adds additional memory for 128,000 data point buffering.
When two sensors are attached and calibrated, the maximum is 64,000 readings per
channel.
During BURSt mode, the COUNt# of readings will be taken with just one instrument
trigger. During the SWIFt Mode however, you can control the triggering of individual data
points. If you set triggering to EXT, the power meter will perform one measurement each
time it detects a TTL level signal. The value is then stored in the data buffer. This contin-
ues until the meter has received and processed a COUNt# of triggers and also read in a
COUNt# of data points to the buffer.
*WAI
Example : OUTPUT @Pwr_mtr;*WAI ! Wait, following command completion
Description : The *WAI command causes the power meter to wait until all previous commands and
queries are completed before continuing operation. It functions only when using the
Normal mode of operation.
Example programs for Instrument Triggering are contained in Appendix A.