R&S FS300, Руководство по эксплуатации

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R&S FS300 Spectrum Analyzer
Operating manual, 02/2006 6-93 E-1007.9900.15
6.2.2.5 Setting the RF Input Attenuation Manually
Use
In the default setting, the input attenuation is coupled to the reference level. In
most cases, this is the setting that will be used because it prevents the input
stages from being overdriven and so, consequently, any incorrect measure-
ments.
In exceptional cases, it may be necessary to adjust the input attenuation
manually with input attenuations from
0
to
70 dB
.
Setting the input
attenuation
manually
1.
Press the
function key
in the
menu
.
A selection field containing the available settings is displayed. The de-
fault setting is 16 dB.
2.
Select an input attenuation for the RF input with
rotary knob [10].
3.
Press the
ENTER key
[5] to close the selection field.
The new setting is saved and the RF input is re-configured.
Invalid parameter
entry
If the reference level you have specified cannot be set for the input attenua-
tion that has been entered, ( 6-88), it is automatically adjusted.