1Selecting The Detector - R&S ESU Series Operating Manual

R&S ESU
4.5.4.1 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:
Coupling of the IF bandwidth to the frequency range with the CISPR average
detector activated can be switched off by the CISPR RBW UNCOUPLED softkey.
• The rms detector yields the rms level of the samples measured. The integration
time corresponds to the set measurement time.
• The CISPR rms 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:
The coupling of the IF bandwidth to the frequency range with activated CISPR
RMS detector can be cancelled using the CISPR RBW UNCOUPLED softkey.
4.28
Frequency range
IF bandwidth
Time constant of instrument
Frequency range
IF bandwidth
Time constant of instrument
Corner frequency
Band A Band B
< 150 kHz 150 kHz to
30 MHz
200 Hz 9 kHz
160 ms 160 ms
Band A Band B Band C/D
< 150 kHz 150 kHz to 30 MHz to 1
30 MHz GHz
200 Hz 9 kHz 120 kHz
160 ms 160 ms 100 ms
10 Hz 100 Hz 100 Hz
Operating Manual 1302.6163.12 - 03
Instrument Functions
Receiver Mode
Band C/D Band F
30 MHz to 1 > 1 GHz
GHz
120 kHz 1 MHz
100 ms 100 ms
Band E
> 1 GHz
1 MHz
100 ms
1 kHz