Operation
Publication 21555, Rev. E, September 2002
2-23
Example programs for Instrument Triggering are contained in Appendix A.
TRIG:DEL
Syntax:
TRIGger:DELay
space
<delay time between buffered readings in sec, 0.000 to 5.000>
Example:
OUTPUT @PWR_MTR;TRIG:DEL 5E-3 ! SETS BURST MODE MEASUREMENT TIME TO
! 5 MS BETWEEN MEASUREMENTS.
Example 2:
OUTPUT @PWR_MTR;TRIG:DEL 0
! MAX. MEASUREMENT RATE (RESOLUTION,
! 1 MSEC)
Description:
This command applies only to the BURSt Mode. It sets the time interval between the
measurements and is accurate to about 5%. This is the only way to control the data
acquisition of individual data points in a burst measurement. Burst measurement data is
taken following or just prior to a single instrument trigger event. The number of measurements
taken is controlled by TRIG:COUNt. Timing can be set in 0.001 second increments from
0.000 to 5.000 seconds, inclusive. Setting this control to 0.000 activates the highest reading
rate (5100 rdgs/sec) possible with the 58542.
Triggering of the Peak Power Sensor occurs independently from instrument triggering.
Therefore, there is a moderate ability to control triggering at the Peak Power Sensors.
Generally, if controlling is required of individual data point triggering, the SWIFt mode will
provide the highest measurement rates, with or without SRQ or hardware handshaking.
TRIG:COUN
Syntax:
TRIGger:COUNt
space
<number of data values to buffer in memory from 1 to 5000 for the standard 58542; 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
! SETS 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
58542 data buffer.
The value specified here applies to each individual channel. That is, if two sensors are
attached and calibrated, the 58542 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, to control the triggering of individual data points. 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 continues 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.
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