1 Power Meter Remote Operation
46 N1911A/1912A P-Series Power Meters Programming Guide
• Single Shot: When a channel is in Single Shot, it takes a new
measurement when a trigger event is detected and then returns to the
idle state. A channel is in Single Shot when INITiate:CONTinuous is
set to OFF. Note that a measurement can take several INT/EXT triggers
depending on the filter settings. Refer to “TRIGger[1]|2:DELay:AUTO
<boolean>” on page 659 for further information.
Tri gger with Delay
This can be achieved using the same sequences above (apart from the
second) with TRIG:DEL:AUTO set to ON. Also, the MEAS? command
operates in trigger with delay mode.
In trigger with delay mode, a measurement is not completed until the
power meter filter is full. In this way, the reading returned is guaranteed
to be settled. In all other modes, the result returned is simply the current
result from the filter and may or may not be settled. This depends on the
current length of the filter and the number of readings that have been
taken since a change in power level.
With trigger with delay enabled, the measurement speed can be calculated
roughly using the following equation:
readings/sec = speed (as set by SENSe:SPEed) / filter length
For example, with a filter length of 4 and SENS:SPE set to 20,
approximately 5 readings/sec is calculated by the power meter.
Typically, free run mode provides the best speed performance from the
power meter (especially in 200 readings/sec mode).
A trigger event can be any of the following:
• The input signal meeting the trigger level criteria.
• Auto-level triggering being used.
•A TRIGger GET or *TRG command being sent.
• An external TTL level trigger being detected.
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