Triggering the Sweep - Analyzer
R&S FSMR
1166.3363.12
4.10-2
E-1
EXTERN
The
EXTERN
softkey activates triggering via a TTL signal at the input
connector
EXT TRIGGER/GATE
on the rear panel.
The external trigger level can be adjusted in the range from 0.5 V to 3.5 V. The
default value is 1.4 V.
IEC/IEEE-bus command:
TRIG:SOUR EXT <numeric_value>
SWE:EGAT:SOUR EXT
IF POWER
The
IF POWER
softkey activates triggering of the measurement via signals
which are outside the measurement channel.
For this purpose, the R&S FSMR uses a level detector at the second
intermediate frequency. can be selected in a range between –50 dBm and -10
dBm at the input mixer. The resulting trigger level at the RF input is calculated
via the following formula:
eampGain
RFAtt
Mixerlevel
Signal
Input
eampGain
RFAtt
Mixerlevel
Pr
Pr
max
min
+
+
The bandwidth at the intermediate frequency is 50 MHz. The R&S FSMR is
triggered as soon as the trigger threshold is exceeded within a 25 MHz range
around the selected frequency (= start frequency in the frequency sweep).
Thus, the measurement of spurious emissions, e.g. for pulsed carriers, is
possible even when the carrier lies outside the selected frequency span.
IEC/IEEE-bus command:
TRIG:SOUR IFP
SWE:EGAT:SOUR IFP
TRIGGER
OFFSET
The
TRIGGER OFFSET
softkey activates the window for entering the time
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
multiples 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 limited
by the set sweep time:
max. range = - 499/500 x 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.
IEC/IEEE-bus command:
TRIG:HOLD 10US
POLARITY
POS NEG
The
POLARITY POS/NEG
softkey selects the polarity of the trigger source.
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.
IEC/IEEE-bus command:
TRIG:SLOP POS
Summary of Contents for FSMR
Page 1: ...R S FSMR Measuring Receiver Operating Manual Test Measurement Operating Manual 1313 9723 12 01...
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Page 130: ...Menu Overview R S FSMR 1166 3363 12 3 42 E 3 Menu Overview another Keys MKR Key...
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