Setting the Sweep
R&S FSH
1145.5973.12 4.16
E-14
Sweep mode
When the default settings are activated, the R&S FSH is in the continuous sweep mode, i.e. when one
sweep of the span has been completed, the sweep is automatically repeated from the start of the span.
The trace is refreshed after each sweep.
The continuous mode may not be needed for some applications, e.g. when a single event is to be
recorded on certain trigger conditions being met. The R&S FSH, therefore, has a SINGLE SWEEP
mode. When the single sweep mode is selected, the R&S FSH sweeps once over the span or displays
the time-domain video signal once in the zero-span mode. The measurement will only be repeated if
you press the SINGLE SWEEP softkey.
Press the SWEEP key.
If the default setting is selected, the CONT SWEEP
softkey label is highlighted in green to indicate that the
continuous sweep mode has been set.
Press the SINGLE SWEEP softkey.
The SINGLE SWEEP softkey label is highlighted in
green. The R&S FSH performs a single sweep and
waits for further entries.
Press the CONT SWEEP softkey.
The R&S FSH now sweeps continuously again.
Trigger
To respond to events, the R&S FSH has a variety of trigger functions. The trigger can either be external
or generated internally.
•
FREE RUN
A new sweep starts on completion of the previous sweep. This is the
default setting for the R&S FSH.
•
VIDEO
A sweep starts when the video voltage exceeds a settable value.
Video triggering is only available when span = 0 Hz. When a
frequency spectrum is being displayed, (span 10 kHz), there is no
guarantee that a signal to generate a video voltage is present at the
start frequency. Under these circumstances, the R&S FSH would
never perform a sweep.
•
EXTERN and EXTERN
The sweep is started on the rising edge ( ) or on the falling edge ( )
of an external trigger signal. The external trigger signal is fed in via
the BNC connector EXT TRIGGER. The switching threshold is
1.4 V, i.e. a TTL signal level.
When a video trigger or an external trigger is selected, the start of measurement can be delayed with
respect to the trigger event by entering a delay (DELAY). In this way, time differences between the
trigger event and the measurement can be allowed for.
The current trigger setting is displayed centrally at the top of the screen
(e.g. Trig: Free).
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