Rohde & Schwarz R&S FSH - Page 34

Performance Test R&S FSH
1145.5973.82 1.10 E-11
Evaluation: The signal level L is displayed by the level reading of the marker.
The difference between the level inaccuracy of the R&S FSH and Ref
0dBm
is the uncertainty of the display linearity:
Linearity
uncertainty
= (L - L
powermeter
) – Ref
0dBm
2
nd
Measurement
30 to 50 dB below reference
level
Because the sensitivity of the power meter is limited, the internal RF
attenuator of the Galaxy is used to increase the dynamic range of the
input signal.
R&S FSH settings:
- [ AMPT: 20 dBm ]
Signal generator settings: - Frequency 100 MHz
- Level - 4 dBm
 Determine the output power of the signal generator with the power
meter. Adjust the output power of the generator until the power meter
shows
-10 dBm.
Reference measurement:  Set the marker to the peak of the signal.
- [MARKER: SET MARKER: PEAK ]
The signal level L
is displayed by the level reading of the marker.
With the result of the 1
st
linearity measurement, a new correction factor is
to be calculated. “Linearity
uncertainty
(-30dB)” is the measured uncertainty of
the R&S FSH linearity at 30 dB below reference level.
Ref
20dBm
= (L - L
powermeter
) – Linearity
uncertainty
(-30dB)
Signal generator settings: - Frequency 100 MHz
- Level Sig_Lev + 6 dB
Refer to table under “Performance Test Report” for values of {Sig_Lev}.
 Determine the output power of the signal generator with the power
meter. Adjust the output power of the generator until the power meter
shows the value Sig_Lev ± 0.2 dB.
Evaluation: The signal level L
is displayed by the level reading of the marker.
The difference between the level inaccuracy of the R&S FSH and
Ref
20dBm
is the uncertainty of the display linearity:
Linearity
uncertainty
= (L - L
powermeter
) – Ref
20dBm