Operating Manual EMI TEST RECEIVER ESIB7 - Rohde & Schwarz

ESIB
Receiver - Operation on a Discrete Frequency
Quasi-peak measurement:
With quasi-peak measurements, the maximum value of the
weighted signal during the measurement time is displayed. The
relatively long time constants used with quasi-peak detectors
entail long measurement times to obtain correct results. With
unknown signals the measurement time should be at least 1 s.
This ensures correct weighting of pulses down to a pulse
frequency of 5 Hz.
After internal switching, ESIB waits until the measurement result
has stabilized before it starts the actual measurement. Since the
level does not change during a frequency scan, known signals (eg
broadband RFI) can be correctly measured with a much shorter
measurement time.
Average measurement:
With average detection selected, the video voltage (envelope of
IF signal) is averaged during the measurement time. Averaging is
digital, ie the digitized values of the video voltage are summed up
and divided by the number of samples at the end of the
measurement time. With unmodulated signals the shortest
possible measurement time can be selected. With modulated
signals the measurement time is determined by the lowest
modulation frequency to be averaged. With pulse signals, the
selected measurement time should be long enough for sufficient
number of pulses (>10) to occur in the measurement window for
averaging.
RMS measurement:
With RMS weighting the same applies to the measurement time
as with the average measurement.
Measurement with several
detectors:
If several detectors are used simultaneously, a measurement time
suiting the slowest detector should be selected to obtain correct
results for all detectors. It is therefore recommended to set a
measurement time that matches the average detector when the
peak and average detectors are used.
1088.7531.12 4.85 E-15