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R&S
FS-K30
Measurements & Settings
Measurement
Settings
Software Manual 1300.6637.42 - 03
63
When
Automatic Ref Level
is set to ON, R&S FS-K30 will measure the reference level
automatically. This happens at one of two times:
I
If
2nd Stage Correction
is ON, then the reference level is determined and set at the
start 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 (
Range
). Then the rest of the
calibration measurement is performed.
I
If
2nd Stage Correction
is OFF, then the reference level is determined and set prior
to each 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. Then the rest of the measurement is performed.
Setting
Auto Ref Level
OFF will reduce the total measurement time for a noise
measurement, since no reference level measurement will be performed.
2.5.3.7 Ref Level
Ref Level
is the reference level that the spectrum analyzer will use for the
measurement. All measurements are taken relative to this absolute reference level.
The
Ref Level
cannot be edited when
Automatic Ref Level
is set to ON, since this
means that a measurement will be run to automatically determine the reference level.
Refer to the
Automatic Ref Level
parameter description for details.
The
Ref Level
should be about 5 to 15dB above the noise display that occurs with the
DUT connected and the noise source activated.
Even in the case of DUTs with a high-ripple frequency response, it can be useful to
enter the
Ref
Level manually, as an automatic reference level setting may not always
result in optimal settings.
2.5.3.8 Range