R&S ESCI Receiver – MEAS Key
1166.6004.12 4.17 E-2
Selecting the Detector
Six different detectors can be selected for weighting the receive signal.
• The max peak detector yields the largest sample values of the levels measured during the set
measurement time.
• The min peak detector yields the smallest sample values of the levels measured during the set
measurement time.
• The average detector yields the average level of the samples measured during the set measurement
time.
• The CISPR average detector supplies a weighted average. When measuring the average according
to CISPR 16-1, the maximum value of the linear average during the measurement time is displayed.
The detector is used, for example, to measure pulsed sinusoidal signals with a low pulse frequency.
It is calibrated with the rms value of an unmodulated sinusoidal signal. Averaging is with lowpass
filters of the 2nd order (simulation of a mechanical instrument). The lowpass time constants and the
IF bandwidths are fixed depending on the frequency. The main parameters are listed in the following
table:
Band A Band B Band C/D
Frequency range
< 150 kHz 150 kHz to 30 MHz > 30 MHz
IF bandwidth
200 Hz 9 kHz 120 kHz
Time constant of instrument
160 ms 160 ms 100 ms
For frequencies above 1 GHz, the R&S ESCI uses the 120 kHz bandwidth of band C/D.
Coupling of the IF bandwidth to the frequency range with the CISPR average detector activated can
be switched off by the QP RBW UNCOUPLED softkey.
• The rms detector yields the rms level of the samples measured. The integration time corresponds to
the set measurement time.
• The quasi-peak detector yields the maximum detected value weighted to CISPR 16. Depending on
the set frequency, the R&S ESCI automatically selects the detectors and IF bandwidths defined for
bands A, B and C/D listed in the following table:
Band A Band B Band C/D
Frequency range
< 150 kHz 150 kHz to 30 MHz > 30 MHz
IF bandwidth
200 Hz 9 kHz 120 kHz
Charge time constant
45 ms 1 ms 1 ms
Discharge time constant
150 ms 500 ms 550 ms
Time constant of instrument
160 ms 160 ms 100 ms
For frequencies above 1 GHz, the R&S ESCI uses the 120 kHz bandwidth of band C/D.
The coupling of the IF bandwidth to the frequency range with activated quasi peak detector can be
cancelled using the QP RBW UNCOUPLED softkey.
• The input signal of R&S ESCI can be displayed weighted by three detectors simultaneously.
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