R&S FSH Performance Test
1145.5973.82 1.5 E-11
Checking the accuracy of the RF attenuator
Test principle:
The RF attenuator of the R&S FSH can be switched from 0 to 30 dB in
10-dB increments by changing the reference level (RF attenuation = +10
dBm + reference level).
Test equipment: - Signal generator (refer to section "Measurement Equipment and
Accessories", item 3)
Frequency 100 MHz
Maximum level 6 dBm
Test setup: Connect the RF output of the signal generator to the input of the
divider.
Connect output 1 of the divider to the power sensor / power meter.
Connect output 2 of the divider to the RF input of the R&S FSH.
Signal generator settings: - Frequency 100 MHz
- Level -14 dBm
Determine the output power of the signal generator with the power
meter. Adjust the output power of the signal generator until the power
meter shows -20 dBm ± 0.2 dB.
R&S FSH settings:
- [ PRESET ]
- [ FREQ : 100 MHz ]
- [ SPAN : 10 kHz ]
- [ BW : MANUAL RES BW : 1 kHz ]
- [ BW : MANUAL VIDEO BW : 100 Hz ]
- [ TRACE : DETECTOR : RMS ]
- [ AMPT: 0 dBm ]
- [ SETUP : Hardware Setup: Low Noise ]
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.
Ref
0dBm
= L - L
powermeter
Measurement
Signal generator settings: - Frequency 100 MHz
- Level Ref_Lev *) – 14 dB
*) Refer to table under “Performance Test Report” for values of {Ref_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 Ref_Lev – 10 dB.
R&S FSH settings:
- [ AMPT : {Ref_Lev} ]
- [ MARKER: SET MARKER: PEAK ]
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
(at 10 dB RF-Att) is the uncertainty of the RF attenuation:
IF-Gain
accuracy
= (L
- L
powermeter
) – Ref
0dBm
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