Receiver Mode
R&S
®
ESRP
143
User Manual 1175.7445.02 ─ 08
For small measurement bandwidths, the measurement time increases.
Bandwidths and detectors
If you use the Quasipeak, CISPR Average or RMS Average detector, the R&S
ESRP
by default couples the resolution bandwidth to the receiver frequency.
If you need a different bandwidth, you can decouple the bandwidth from the frequency.
When decoupled, you can select any of the supported CISPR bandwidths.
5.2.2
Detectors
The task of the detector is to determine which of the samples that have been recorded
are displayed for each sweep point. The result obtained from the selected detector for
a sweep point is displayed as the signal level at this frequency point in the trace.
The detectors of the R&S
ESRP are implemented as digital devices. All detectors work
in parallel in the background, which means that the measurement speed is independ-
ent of the detector combination used for different traces.
The receiver mode of the R&S
ESRP provides several detectors, including detectors
that are especially designed for and required by EMI applications.
You can use several detectors at the same time. The combined use of several detec-
tors (multiple detection) is important for EMI measurements. This is due to specifica-
tions in the standards, for example commercial standards specifiy limits for quasipeak
and average values. In that case, multiple detection requires only one measurement.
The R&S
ESRP allows you to use different detectors for the bargraph, scan and final
measurement.
Maximum and Minimum peak detector
The max/min detector yields the maximum/minimum level occurred during the set mea-
surement time. The peak detector is reset at the beginning of each measurement.
Regarding measurement time,
●
unmodulated signals can be measured with the shortest possible measurement
time.
●
for pulses, the selected measurement time must be long enough for at least one
pulse to occur during the measurement time.
The peak detectors are digital detectors. Therefore, discharging is irrelevant even with
long measurement times.
Average detector
The average detector yields the average level of the samples of the samples measured
during the set measurement time.
With average detection selected, the video voltage (envelope of IF signal) is averaged
during the measurement time. Averaging is digital, i.e. the digitized values of the video
Measurement Basics
