R&S ESU Series Operating Manual page 154

R&S ESU
Side menu
DELAY COMP
ON | OFF
FREE RUN
The FREE RUN softkey activates the free-run sweep mode, i.e. start of a sweep is
not triggered. Once a measurement is completed, another is started immediately.
FREE RUN is the default setting of R&S ESU.
Remote command:
VIDEO The VIDEO softkey activates triggering through the displayed voltage.
For the video triggering mode, a horizontal trigger line is shown in the diagram. It
may be used to set the trigger threshold between 0% and 100% of the overall dia-
gram height.
Remote command:
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.
Remote command:
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 ESU uses a level detector at the second intermediate fre-
quency. The detector threshold can be selected in a range between –30 dBm and -
10 dBm at the input mixer. The resulting trigger level at the RF input is calculated via
the following formula:
For this purpose, the R&S ESU uses a level detector at the second intermediate fre-
quency. The detector threshold 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:
MixerLevel
The bandwidth at the intermediate frequency is 10 MHz. The R&S ESU is triggered
as soon as the trigger threshold is exceeded within a 5 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.
Remote command:
Operating Manual 1302.6163.12 - 03
GATE DELAY
GATE LENGTH
SWEEPTIME
TRIG:SOUR
TRIG:SOUR
TRIG:LEV:VID 50 PCT
TRIG:SOUR EXT <numeric_value>
SWE:EGAT:SOUR EXT
TRIG:SEQ:LEV:EXT
+ RFAtt PreampGain –
min
TRIG:SOUR
SWE:EGAT:SOUR
IMM
VID
≤ ≤
InputSignal MixerLevel
IFP
IFP
Instrument Functions
Analyzer Mode
+ RFAtt PreampGain –
max
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