Operating Manual EMI TEST RECEIVER ESIB7 - Rohde & Schwarz

ESIB- Receiver
ESIB
Selecting the Detector
The ESIB detectors are all-digital. Five different detectors can be selected for weighting the receive
signal. If ESIB is equipped with option ESIB-B1, Linear Video Output, the AC VIDEO detector has been
added to those already available.
The input signal of ESIB can be displayed weighted by five detectors.
Peak detectors
(MAX PEAK/ MIN PEAK)
Quasi-peak detector
(QUASIPEAK)
Peak detectors are implemented with digital comparators, which
determine the largest sample values (max peak) or the smallest
sample values (min peak) of the levels measured during the set
measurement time.
The quasi-peak detector yields the maximum detected value
weighted to CISPR 16 during the set measurement time.
For this purpose ESIB uses the linear display voltage after
envelope detection. The linear sampling values are weighted with
a digital detector. The time constants defined for the bands A, B
and C/D are automatically set as a function of the receive
frequency.
With switched-on quasi-peak detector, a fixed bandwidth is preset
as a function of frequency.
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 500 ms 160 ms 550 ms
Time constant of 160 ms 160 ms 100 ms
instrument
For frequencies above 1 GHz, ESIB uses the settings 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.
If the coupling is cancelled, any of the three CISPR bandwidths
200 Hz, 9 kHz, 120 kHz can be selected for a given frequency
range (softkey RES BW).
Average detector
(AVERAGE)
The average detector yields the average level of the samples
measured during the set measurement time.
The ESIB uses the linear display voltage after envelope detection.
The linear sample values are summed and the sum is divided by
the number of measurement samples (= linear average value). In
the case of logarithmic display, the logarithm is then formed from
the average value.
The average detector gives the true average of the signal
irrespective of the waveform (CW carrier, modulated carrier, white
noise or pulse signal).
1088.7531.12 4.80 E-15