2Time Domain Scan In The Frequency Domain - R&S ESU Series Operating Manual

R&S ESU
Table 4-1
Start frequency
Stop frequency
Step width
IF bandwidth
Measurement time
Auto ranging
Attenuation mode
RF attenuation
Preamplification
The diagram parameters to be defined are: start frequency 150 kHz, stop frequency
1 GHz, min. level 0 dBµV, grid range log 100 dB, log. frequency axis and continuous
scan.
The measurement parameters correspond to the settings recommended for over-
view measurements to CISPR 16.
4.5.5.2 Time Domain Scan in the Frequency Domain
This functionality is only available with the R&S ESU-K53 option.
Up till now, long EMI measurement times were necessary in EMC test laboratories,
when correct measurements of unknown EUTs had to be made. Time saving proce-
dures as explained in
total measurement time by reducing the number of quasipeak measurements to a
minimum. But this time is still very long, because it is often in the order of hours,
especially for the CISPR radiated emission test. A way out of this situation can be
time-domain measurements. Whereas in conventional EMI measurement systems,
only the spectrum within the IF filter can be measured during a certain measurement
time of e.g. 100 ms, in TDEMI measurement systems, large parts of the spectrum at
the receiver input can be measured during the same time and it depends on the
dynamic range and the resolution of the A/D conversion system, how accurate the
measurement results are. Systems with higher resolution can provide a higher
dynamic range.
The R&S ESU uses an internal fast A/D converter with up to 80 MHz sampling rate
to convert a spectrum width of up to 7 MHz at a time. The restriction of the FFT width
is due to the built-in preselection.
Frequency range
<= 150 kHz
150 kHz ... 2 MHz
2 MHz ... 8 MHz
4.52
Default setup of scan table
Range 1
150 kHz
30 MHz
Auto
9 kHz
1 ms
OFF
Normal
10 dB
OFF
"Data Reduction and Peak List" on page 4.33
Max. Resolution
Bandwidth
50 kHz
50 kHz
50 kHz
Instrument Functions
Receiver Mode
Range 2
30 MHz
1 GHz
Auto
120 kHz
100 µs
OFF
Normal
10 dB
OFF
FFT width
150 kHz
2 MHz
500 kHz
Operating Manual 1302.6163.12 - 03
reduced the