R&S FSW Series, Руководство пользователя

Страница: 334 / 1450

Measurements and Results
R&S
®
FSW
334 User Manual 1173.9411.02 ─ 43
● Initial Measurement - Peak Search .......................................................................340
● Final Measurement at the Marker Position ........................................................... 341
● Limit Checks ..........................................................................................................341
7.13.3.1 Resolution Bandwidth and Filter Types
EMI testing requires resolution filters with a 6 dB bandwidth. The R&S FSW EMI mea-
surement adds the following bandwidths that comply to commercial and military stand-
ards to those already available with the base unit:
Commercial (CISPR, FFC etc.)
●
200 Hz
●
9 kHz
●
120 kHz
●
1 MHz (not with Quasipeak detector, see "Quasipeak detector (CISPR filter only)"
on page 335)
Military (MIL Std)
●
10 Hz
●
100 Hz
●
1 kHz
●
10 kHz
●
100 kHz
●
1 MHz
For the Quasipeak, CISPR Average, or RMS Average detector, the bandwidth is fixed
depending on the frequency. For more information see
Chapter 7.13.3.2, "Detectors
and Dwell Time" , on page 334.
7.13.3.2 Detectors and Dwell Time
The EMI measurement adds new detectors to those already available with the base
unit. The additional detectors are especially designed for and required by EMI applica-
tions.
The additional detectors are available only if the EMI (R&S FSW-K54) measurement
option is installed and the filter type "CISPR" or "MIL" is selected (see Chap-
ter 7.13.3.1, "Resolution Bandwidth and Filter Types" , on page 334).
However, the EMI measurement need not be active.
The detector to be used for the initial peak search is configured in the trace settings
(see
Chapter 9.5.1.2, "Trace Settings" , on page 582), while the detector for the final
test is configured in the EMI marker settings, see Chapter 7.13.4.1, "EMI Marker Con-
figuration" , on page 342.
Dwell time
EMC tests often require a specific dwell time for an EMI measurement. The dwell time
defines how long the R&S FSW measures the signal at the individual frequencies.
Electromagnetic Interference (EMI) Measurement