R&S FSW Series, Руководство пользователя

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Common Measurement Settings
R&S
®
FSW
407 User Manual 1173.9411.02 ─ 43
Compensating the effects of additional attenuation after calibration
After calibration, an additional attenuator is inserted between the DUT and the
R&S
FSW. This may be necessary, for example, to protect the analyzer's input connec-
tor. Nevertheless, we are only interested in the effects of the DUT, not those of the
additional protective attenuator. Thus, we will compensate these effects in the result
display on the R&S
FSW by moving the reference line.
1. Connect a 3 dB attenuator between the band elimination filter output and the [RF
input] connector on the R&S FSW.
The measurement results are now 3 dB lower.
Figure 8-12: Measurement results with additional attenuator
2. In the "Source Calibration" tab, enter "Reference Value": -3 dB .
The reference line is shifted down by 3 dB so that the measurement trace is dis-
played on the reference line again.
At the same time, the scaling of the y-axis is changed: -3
dB are now shown at
50% of the diagram; the range is [-53 dB to +47 dB ].
Data Input and Output