R&S FSMR, Operating Manual

Page: 235 / 955

R&S FSMR Analyzer - Triggering the Sweep
1166.3363.12 4.10-5 E-1
GATE
SETTINGS
GATE
DELAY
GATE
LENGTH
SWEEPTIME
POLARITY
POS NEG
GATE MODE
LEVEL EDGE
The GATE SETTINGS softkey calls a submenu for making all
the settings required for gated-sweep operation.
At the same time, a transition is made to the time domain
(span = 0) and the time parameters
GATE DELAY and GATE
LENGTH are represented as vertical lines. This allows the
required gate time parameters to be set easily.
For highly accurate setting of gate delay and gate length, the
x axis can be altered using the
SWEEPTIME softkey in a
way that the signal range concerned (e.g. one full burst) is
displayed.
Then the sampling time and duration can be set by
GATE
DELAY and GATE LENGTH in a way that the desired portion
of the signal is shown.
When quitting the submenu, the program will return to the
frequency domain provided it was active before. The original
span is restored so the desired measurement can now be
performed with the accurately set gate.
IEC/IEEE-bus command:
--
GATE MODE
LEVEL EDGE
The GATE MODE LEVEL/EDGE softkey selects the trigger
mode. Gated sweep is possible in the level-triggered as well
as in the edge-triggered mode.
If level triggering is selected, the GATE LENGTH softkey
becomes inactive and cannot be operated.
IEC/IEEE-bus command:
SWE:EGAT:TYPE EDGE
POLARITY
POS NEG
The POLARITY POS/NEG softkey controls the polarity of the
EXT TRIGGER/GATE control line.
In case of level triggering the sweep is stopped by
POLARITY POS and a logic ´0´ signal; the signal ´1´ will
restart the sweep after the GATE DELAY time has elapsed.
In case of edge triggering the sweep is continued on a ´0´ to
´1´
transition
for the duration of GATE LENGTH after a delay
( GATE DELAY) has elapsed.
Changing the polarity automatically implies a transition of the
trigger-edge polarity (
POLARITY softkey in the higher menu).
IEC/IEEE-bus command:
SWE:EGAT:POL POS