Common Measurement Settings
R&S
®
FSMR3000
139
User Manual 1179.0116.02 ─ 02
Compensating the effects of additional attenuation after calibration
After calibration, an additional attenuator is inserted between the DUT and the
R&S
FSMR3. This may be necessary, for example, to protect the analyzer's input con-
nector. 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
FSMR3 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
FSMR3.
The measurement results are now 3
dB lower.
Figure 7-12: 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
].
Input and Frontend