Boonton 4540 Peak Power Meter User Manual - Manual (Page 214)

Boonton 4540 Series RF Power Meter
Remote Operation 5-80
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 timebase). This will keep the trace updating even if the pulse edges
stop. The AUTOPKPK mode operates the same as AUTO mode, but will adjust the trigger level
to halfway between the highest and lowest power or voltage 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. The FREERUN mode
force traces at a high rate to assist in locating the signal.
Syntax: TRIGger:MODe <character data>
Argument: <character data> = {AUTO, AUTOPKPK, NORMAL, FREERUN}
Valid Modes: Pulse mode only
TRIGger:POSition
Description: Set or return the position of the trigger event on displayed sweep. Assuming zero trigger delay,
setting the position to LEFT causes the entire trace to be post-trigger. Setting it to RIGHT causes
the entire trace to be pre-trigger. And setting to MIDDLE will display both the pre- and post-
trigger portions of the trace. Note that the TRIGger:DELay setting is in addition to this setting,
and will cause the trigger position to appear in a different location. Setting the trigger position
places the 4540 in trigger position mode, which overrides the variable vernier settings of the
TRIGger:VERNier command.
Syntax: TRIGger:POSition <character data>
Argument: <character data> = {LEFT, MIDDLE, RIGHT}
Valid Modes: Pulse mode only
TRIGger:SLOPe
Description: Set or return the trigger slope or polarity. When set to POS, trigger events will be generated when
a signal’s rising edge crosses the trigger level threshold. When NEG, trigger events are generated
on the falling edge of the pulse.
Syntax: TRIGger:SLOPe <character data>
Argument: <character data> = {NEG, POS}
Valid Modes: Pulse mode only