R&S 1129.7246.03, Operating Manual

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R&S ESU Instrument Functions
Receiver Mode
4.28 Operating Manual 1302.6163.12 - 03
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.
Band A Band B Band C/D Band F
Frequency range < 150 kHz 150 kHz to
30 MHz 30 MHz to 1
GHz > 1 GHz
IF bandwidth 200 Hz 9 kHz 120 kHz 1 MHz
Time constant of instrument 160 ms 160 ms 100 ms 100 ms
Band A Band B Band C/D Band E
Frequency range < 150 kHz 150 kHz to
30 MHz 30 MHz to 1
GHz > 1 GHz
IF bandwidth 200 Hz 9 kHz 120 kHz 1 MHz
Time constant of instrument 160 ms 160 ms 100 ms 100 ms
Corner frequency 10 Hz 100 Hz 100 Hz 1 kHz