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Trigger
More Information
The trigger menus let you select the trigger source and trigger settings for a sweep or measurement. In
triggered operation (basically, any trigger source other than Free Run), the analyzer will begin a sweep or
measurement only with the selected trigger conditions are met, generally when your trigger source signal
meets the specified trigger level and polarity requirements. (In FFT measurements, the trigger controls
when the data acquisition begins for FFT conversion.)
For each of the trigger sources, you may define a set of operational parameters or settings which will be
applied when that source is selected as the current trigger source. Examples of these settings are Trigger
Level, Trigger Delay, and Trigger Slope. You may apply different settings for each source; so, for
example, you could have a Trigger Level of 1v for External 1 trigger and –10 dBm for Video trigger.
Once you have established the settings for a given trigger source, they generally will remain unchanged
for that trigger source as you go from measurement to measurement within a Mode (although the settings
do change as you go from Mode to Mode). Furthermore, the trigger settings within a Mode are the same
Notes: Not all measurements have all the trigger sources available to them. Check the
trigger source documentation for your specific measurement to see what
sources are available.
Not all trigger sources are available for each input. For the
I/Q Trigger
Source,
the following trigger sources are available:
— IMMediate - free run triggering
— EXTernal1 (or EXTernal) - triggers on an externally connected trigger
source on the rear panel
— EXTernal2 - triggers on an externally connected trigger source on the front
panel
— IQMag - triggers on the magnitude of the I/Q signal
— IDEMod - triggers on the I/Q signal's demodulated I voltage
— QDEMod - triggers on the I/Q signal's demodulated Q voltage
— IINPut - triggers on the I channel's ADC voltage
— QINPut - triggers on the Q channel's ADC voltage
— AIQMag - triggers on the magnitude of the auxiliary receiver channel I/Q
signal
*OPC should be used after requesting data. This will hold off any subsequent
changes to the selected trigger source, until after the sweep is completed and
the data is returned.
Available ranges, and from mode to mode presets can vary
Status Bits/OPC dependencies: The Status Operation Register bit 5 "Waiting for Trigger" is set at the same
time as the Sweeping or Measuring bit is set. It is cleared when the trigger
actually occurs (that is, after the trigger event occurs and all the applicable
trigger criteria have been met). A corresponding pop-up message ("Waiting
for trigger") is generated if no trigger signal appears after approximately 2 sec.
This message goes away when a trigger signal appears.
Initial S/W Revision: Prior to A.02.00