Boonton 4540 Peak Power Meter User Manual - Manual (Page 213)

Boonton 4540 Series RF Power Meter
Remote Operation 5-79
TRIGger:DELay
Description: Set or return the trigger delay time in seconds with respect to the trigger for the trigger display
location in the LEFT position. Positive values cause the actual trigger to occur after the trigger
condition is met. This places the trigger event to the left of the trigger point on the display, and is
useful for viewing events during a pulse, some fixed delay time after the rising edge trigger.
Negative trigger delay places the trigger event to the right of the trigger point on the display, and
is useful for looking at events before the trigger edge.
Syntax: TRIGger:DELay <numeric_value>
Argument: Timebase setting Trigger Delay range (LEFT position only)
5 ns/div to 500 ns/div –4 ms to +100 ms
1 us/div to 10 ms/div 4000 divisions
20 ms/div to 3600 sec/div –40 to +100 sec
Valid Modes: Pulse mode only
TRIGger:HOLDoff
Description: Set or return the trigger holdoff time in seconds. 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 10 nanoseconds, and it should be set to a
time that is just slightly shorter than the frame repetition interval.
Syntax: TRIGger:HOLDoff <numeric_value>
Argument: <numeric_value> = 0.0 to 1.0 seconds in 10 ns increments, 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. The internal trigger level entered should include any global offset and will
also be affected by the frequency cal factor. The available internal trigger level range is sensor
dependent. For internal trigger sources, the trigger level is set and returned in dBm. The external
trigger is set and returned in volts. Note that there is a small amount of hysteresis built into 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 AUTOPKPK will cancel the AUTOPKPK setting, and force
the trigger mode back to AUTO. In AUTOPKPK the Trigger Level menu will display ―AUTO
LEVEL‖.
Syntax: TRIGger:LEVel <numeric_value>
Argument: <numeric_value> = –40.0 to +20 dBm (plus offset, if any) (internal trigger sources)
<numeric_value> = 5.0 volts (external trigger)
Valid Modes: Pulse mode only