Noise Figure Measurements Option (K30) R&S FSL
1300.2519.12 4.262 E-11
RF Attenuation
Specifies the attenuation that is applied to the received RF signal.
To obtain a low noise figure for the analyzer and hence more accurate noise measurements,
0 dB should be set. For high DUT power levels or critical matching, a higher setting is also
possible. A setting of 10 dB will give a much better VSWR (voltage standing wave ratio) of the
analyzer, but will result in a worse noise figure of the analyzer.
Remote: INP:ATT 30 DB
Automatic Ref Level
Activates or deactivates the automatic reference level setting.
Off
Specify a reference level manually (see Ref Level softkey).
On The reference level is measured automatically. The total measurement time increases.
The automatic reference level measurement is performed as follows:
– 2nd stage correction activated:
At the beginning of the calibration measurement, several measurements are performed at the
first frequency test point and the reference level is calculated from these results taking into
account the maximum gain of the DUT (see Range softkey).
– 2nd stage correction deactivated:
At the beginning of the main measurement, several measurements are performed at the first
frequency test point and the reference level is calculated from these results. The range setting
is not significant.
Remote: DISP:TRAC:Y:RLEV:AUTO ON
Ref Level
Specifies the reference level. It is only possible to enter a reference level manually, if the
automatic reference level is deactivated (see Automatic Ref Level softkey).
The reference level should be about 5 to 15 dB above the noise display that occurs with the
DUT connected and the noise source activated.
Even for DUTs with a high–ripple frequency response it can be useful to enter the reference
level manually, because an automatic reference level setting may not always result in optimal
settings.
Remote: DISP:TRAC:Y:RLEV 0
Range
Specifies the maximum gain expected from the DUT.
If the 2nd Stage Correction is activated, this value is used to calculate the automatic reference
level to ensure that the expected power of the measured signal will be within the optimum
operating range of the spectrum analyzer (see Automatic Ref Level softkey).
To ensure accurate measurement results, the range should not exceed the actual gain of the
DUT by more than a margin of 10 dB.
Remote: SYST:CONF:DUT:GAIN 10
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