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Receiver Mode

R&S

ESR

146User Manual 1175.7068.02 ─ 12

Nevertheless, this time is still very long, often in the order of hours, especially for the

CISPR radiated emissions tests. A way out of this situation can be time-domain mea-

surements, see Chapter 5.1.3.2, "Time Domain Scans in the Frequency Domain",

on page 146.

5.1.3.2 Time Domain Scans in the Frequency Domain

Time Domain scan are available with firmware application R&S ESR-K53 and hard-

ware option R&S ESR-B50. Measurement results fully comply with CISPR 16-1-1

standards.

Time domain scan reduce the overall measurement time enormously. For applications

like voltage tests, no preliminary measurement for data reduction is required, because

the final measurement with the quasipeak detector is already fast enough. For more

time consuming tests like field strength test with mast and turn table, prescans are still

recommended. However, due to the increased measurement speed both in prescan

and final scan, the overall measurement still is considerably reduced.

Whereas in conventional EMI measurement systems, only the spectrum within the

measurement bandwidth can be measured during a certain measurement time of e.g.

100 ms, in this measurement systems, large parts of the spectrum at the receiver input

can be measured in parallel using fast fourier transform (FFT) of frequency sections.

For measurements with prescan, the prescan is used to get a detailed overview of the

emission spectrum. The prescan result is then analyzed and the critical frequencies

can be determined. On the critical frequencies, if further maximization with antenna

mast and turntable movement is needed, the R&S ESR can be used in its conventional

measurement function with quasipeak and/or average detection.

5.1.3.3 The Scan Table

Either the current receiver settings or the settings defined in the Scan table are used

for stepped or time domain scans.

In the scan table, up to 10 subranges can be defined within one scan. They need not

be next to each other. The subranges are then scanned by R&S ESR one after the

other. Measurement ranges should not overlap. The parameters to be measured in

each subrange can be selected independently. For more information on the available

range parameters see Chapter 5.3.7.2, "Scan Table", on page 189.

Measurements and Result Displays

R&S ESR Series User Manual

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