Boonton 4530 Peak Power Meter User Manual - Manual (Page 108)

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Chapter 4 Boonton Electronics
Remote Operation 4530 Series RF Power Meter
TRIGger:HOLDoff
Description: Set or return the trigger holdoff time. Trigger holdoff is used to disable the trigger for a
specified amount of time after each trigger event. The holdoff time starts immediately after
each valid trigger edge, and will not permit any new triggers until the time has expired.
When the holdoff time is up, the trigger re-arms, and the next valid trigger event (edge) will
cause a new sweep. This feature is used to help synchronize the power meter with burst
waveforms such as a TDMA or GSM frame. The trigger holdoff resolution is one microsec-
ond, and it should be set to a time that is just slightly shorted than the frame repetition
interval.
Syntax: TRIGger:HOLDoff <n>
Argument: <n> = 10 e-6 to 0.999999 seconds, 0.0 = no holdoff
Valid Modes: Pulse mode only
TRIGger:LEVel
Description: Set or return the trigger level for synchronizing data acquisition with a pulsed input signal
or external trigger pulses. If there is a global offset applied to the channel, the trigger level
entered should include this offset. For internal trigger, the trigger level is always set and
returned in dBm, and for external trigger, the units are volts. Note that there is a small
amount of hysteresis built in to the trigger system, and the signal should have at least one
dB greater swing in each direction past the trigger level setting, and somewhat more at low
levels. Note that explicitly setting the trigger level while
TRIGger:MODe is set to PKTOPK
will cancel the PKTOPK setting, and force the trigger mode back to AUTO.
Syntax: TRIGger:LEVel <n>
Argument: <n> = -40 to +20 dBm (plus channel offset, if any) or -5.0 to +5.0 volts (external trigger)
Valid Modes: Pulse mode only
TRIGger:MODe
Description: Set or return the trigger mode for synchronizing data acquisition with pulsed signals.
NORM mode will cause a sweep to be triggered each time the power level crosses the preset
trigger level in the direction specified by
TRIGger:SLOPe . If there are no edges that cross
this level, no data acquisition will occur. AUTO mode operates in much the same way as
NORM mode, but will automatically generate a trace if no trigger edges are detected for a
period of time (100 to 500 milliseconds, depending on timespan). This will keep the trace
updating even if the pulse edges stop. The third setting, PKTOPK operates the same as
AUTO mode, but will adjust the trigger level to halfway between the highest and lowest
power levels detected. This aids in maintaining synchronization with a pulse signal of
varying level. Note that a setting of PKTOPK will be overridden and forced back to AUTO
if a
TRIGger:LEVel is set.
Syntax: TRIGger:MODe <asc>
Argument: <asc> = NORM, AUTO, PKTOPK
Valid Modes: Pulse mode only. PKTOPK mode functions only for internal trigger sources.