R&S ESU Series Operating Manual page 155

R&S ESU
TRIGGER The TRIGGER OFFSET softkey activates the window for entering the time offset
OFFSET between the trigger signal and the start of the sweep.
Triggering is delayed by the entered time with respect to the trigger signal (time
entered > 0) or is started earlier (time entered < 0). The time may be entered in mul-
tiples of 125 ns in the range -100 s to 100 s (default 0 s).
A negative offset (pretrigger) can be set in the time domain only (SPAN = 0 Hz)
provided GATED TRIGGER is not active in that domain.
The maximum allowed range and the maximum resolution of the pretrigger is lim-
ited by the set sweep time:
max. range = - 499/500 × sweep time
max. resolution = sweep time/500.
Pretriggering is not possible when the rms or the average detector is activated
As a common input signal is used for both trigger and gate when selecting EXTERN
and IF POWER, changes to the gate delay will affect the trigger delay (TRIGGER
OFFSET) as well.
Remote command:
POLARITY The POLARITY POS/NEG softkey selects the polarity of the trigger source.
POS | NEG
The sweep starts after a positive or negative edge of the trigger signal. The selected
setting is highlighted.
The selection is valid for all trigger modes with the exception of FREE RUN; in the
gate mode, it also applies to the gate polarity.
The default setting is POLARITY POS.
Remote command:
By using a gate in sweep mode and stopping the measurement while the gate signal
is inactive, the spectrum for pulsed RF carriers can be displayed without the super-
position of frequency components generated during switching. Similarly, the spec-
trum can also be examined for an inactive carrier. The sweep can be controlled by
an external gate or by the internal power trigger.
4.124
TRIG:HOLD 10US
TRIG:SLOP POS
Operating Manual 1302.6163.12 - 03
Instrument Functions
Analyzer Mode