Operation
Publication 21555, Rev. E, September 2002
2-31
The following commands are duplicates of those given in the Instrument Triggering section of this
chapter and are shown here for convenience. These commands must be used with BURSt mode
operation.
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 after
CALC#:MODE BURS. TRIG:MODE controls the operation of the FIFO data buffer in the
58542. 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 inside the 58542 is performing data acquisition constantly.
Sending any configuration commands while the 58542 is collecting the PRE trigger data,
interrupting the timing of the data point collection can be done.
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, 5100/SEC. (RESOLUTION, ONE
MSEC)
Description:
This command applies only to BURSt Mode. It sets the time interval between the
measurements; it is accurate to about 5%. This is the only way to control the meter’s 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, inclusive. Setting this control to 0.000 activates the highest reading rate possible with
58542; 5100 readings per second.
Triggering of the Peak Power Sensor occurs independently from instrument triggering. There
is a moderate ability to control triggering at the Peak Power Sensors. Generally, if requiring
control of individual data point triggering, SWIFt mode will provide the highest measurement
rates, with or without SRQ or hardware handshaking. The 58542 controls its gain ranges
transparently by verifying internal range changes just before and just after individual
measurement points. If the internal range does not remain the same, the data point will be
discarded as invalid.
TRIG:COUN
Syntax:
TRIGger:COUNt
space
<number of data values to buffer in memory from 1 to 5000>
Example:
OUTPUT @PWR_MTR;TRIG:COUN 100
! SETS BURST OR SWIFT MODE BUFFER READING
! NUMBER TO 100
Description:
The 58542 has an internal data buffer for storing measurement data until the slot 0 controller/
resource manager is ready to read the data. During 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 channel. If two sensors are attached and calibrated,
the 58542 will perform the specified measurement and buffering for both channels. In the
example above, that would be 100 points per channel.
During BURSt mode, the COUNt # of readings will be taken with just one instrument trigger.
During SWIFt Mode however, control the triggering of individual data points. Setting triggering
to EXT, the 58542 will perform one measurement each time a TTL level signal is detected by
the 58542. Then the value is stored in the data buffer. This continues until the 58542 has
received and operated the COUNt # of triggers and also read in the COUNt # of data points to
the buffer.
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