Traces - Analyzer R&S ESCI
1166.6004.12 4.112 E-1
RMS detector The RMS detector forms the rms value of the measured values
within a pixel.
To this effect, R&S ESCI uses the linear voltage after envelope
detection. The sampled linear values are squared, summed and
the sum is divided by the number of samples (= root mean
square). For logarithmic display the logarithm is formed from the
square sum. For linear display the root mean square value is
displayed. Each pixel thus corresponds to the power of the
measured values summed up in the pixel.
The rms detector supplies the power of the signal irrespective of
the waveform (CW carrier, modulated carrier, white noise or
impulsive signal). Correction factors as needed for other detectors
for measuring the power of the different signal classes are not
required.
Average detector The average detector forms the average value of the measured
values within a pixel.
To this effect, R&S ESCI uses the linear voltage after envelope
detection. The sampled linear values are summed up and the
sum is divided by the number of samples (= linear average value).
For logarithmic display the logarithm is formed from the average
value. For linear display the average value is displayed. Each
pixel thus corresponds to the average of the measured values
summed up in the pixel.
The average detector supplies the average value of the signal
irrespective of the waveform (CW carrier, modulated carrier, white
noise or impulsive signal).
Quasipeak detector The quasipeak detector similates the behaviour of an analog
voltmeter by evaluating the measured values in a pixel.
The quasipeak detector is especially designed for the
requirements of EMC measurements and is used for evaluating
pulse-shaped spurious.
Note: During a frequency sweep, R&S ESCI increments the 1st local oscillator in steps that are
smaller than approximately 1/10 of the bandwidth. This is to ensure that the signal level is
correctly measured. For narrow bandwidths and wide frequency spans a very large number
of measured values is thus obtained. The number of frequency steps, however, always is a
multiple of 501 (= number of pixels that can be displayed). With the sample detector
selected, only every n
th
value is displayed. The value of n depends on the number of
measured values, ie on the frequency span, the resolution bandwidth and the
measurement rate.
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