Measurements
R&S
®
FSW
292
User Manual 1173.9411.02 ─ 19
●
Pulsed signals
: the time must be long enough to capture at least one complete
pulse
Average detector
The average detector displays the average signal level of the samples that were collec-
ted during the specified dwell time.
The average detector is already available with the base unit.
Consider the following when defining the dwell time:
●
Unmodulated signals
: minimum time required by the detector
●
Pulsed signals
: the time must be long enough to capture several complete pulses
(at least 10)
●
The time is determined by the lowest modulation frequency to be averaged
RMS detector
The RMS detector displays the root mean square (RMS) value over the specified dwell
time. The integration time is the specified dwell time.
The RMS detector is already available with the base unit.
The same considerations apply to the dwell time as for the average detector.
Sample detector
The sample detector displays the last value from the samples allocated to a pixel.
The sample detector is used for noise or phase noise marker calculation. However, it is
unreliable if the displayed span is much greater then the resolution bandwidth or if the
tuning steps of the local oscillator are too large. The sample detector is not recommen-
ded for EMI tests.
Quasipeak detector (CISPR filter only)
The quasipeak detector displays the maximum signal level weighted to CISPR
16-1-1
that was detected during the dwell time.
The quasipeak detector is only available for the CISPR filter, and not for an RBW of
1
MHz.
The filter bandwidth and time parameters of the detector depend on the measured fre-
quency. The time lag of the simulated pointer instrument reflects the weighting factor of
the signal depending on its form, modulation, etc.
Table 5-16: Required parameters depending on frequency for CISPR quasipeak detector
Band A
Band B
Band C/D
Frequency range
<
150
kHz
150
kHz to 30
MHz
>
30
MHz
Resolution bandwidth
200 Hz
9 kHz
120 kHz
Charge time
45 ms
1 ms
1 ms
Electromagnetic Interference (EMI) Measurement (R&S
FSW-K54)
