R&S ESR Series, User Manual

Page: 474 / 1126

I/Q Analyzer
R&S
®
ESR
471 User Manual 1175.7068.02 ─ 12
In RF Power trigger mode the instrument uses a level detector at the first intermediate
frequency. 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 lies within the
following range:
(-24dBm + RF Att ) ≤ Triggerlevel ≤ (+5dBm + RF Att), max. 30 dBm, for Preamp =
OFF
(-40dBm + RF Att ) ≤ Triggerlevel ≤ (-11dBm + RF Att), max. 30 dBm, for Preamp = ON
with
500 MHz ≤ InputSignal ≤ 7 GHz
Note: If input values outside of this range occur (e.g. for fullspan measurements), the
sweep may be aborted and a message indicating the allowed input values is displayed
in the status bar.
A
Trigger Offset , Trg/Gate Polarity and Trigger Holdoff can be defined for the RF trigger
to improve the trigger stability, but no hysteresis.
Remote command:
TRIG:SOUR RFP
, see
TRIGger<n>[:SEQuence]:SOURce
on page 839
SWE:EGAT:SOUR RFP
for gated triggering, see
[SENSe:]SWEep:EGATe:SOURce
on page 842
IF Power/BB Power ← Trg/Gate Source
Defines triggering of the measurement using the second intermediate frequency.
For this purpose, the R&S ESR uses a level detector at the second intermediate fre-
quency.
The available trigger levels depend on the RF attenuation and preamplification. A refer-
ence level offset, if defined, is also considered.
For details on available trigger levels and trigger bandwidths see the data sheet.
The bandwidth at the intermediate frequency depends on the RBW and sweep type:
Sweep mode:
●
RBW > 500 kHz: 40 MHz, nominal
●
RBW
≤
500 kHz: 6 MHz, nominal
FFT mode:
●
RBW > 20 kHz: 40 MHz, nominal
●
RBW
≤
20 kHz: 6 MHz, nominal
Note: Be aware that in auto sweep type mode, due to a possible change in sweep
types, the bandwidth may vary considerably for the same RBW setting.
The R&S ESR is triggered as soon as the trigger level is exceeded around the selected
frequency (= start frequency in the frequency sweep).
Thus, the measurement of spurious emissions, e.g. for pulsed carriers, is possible
even if the carrier lies outside the selected frequency span.
Remote command:
TRIG:SOUR IFP
, see
TRIGger<n>[:SEQuence]:SOURce
on page 839
SWE:EGAT:SOUR IFP
for gated triggering, see
[SENSe:]SWEep:EGATe:SOURce
on page 842
Softkeys of the Trigger Menu in I/Q Analyzer Mode