Setting the Level Display and Configuring the RF Input – AMPT Key R&S FSL
1300.2519.12 4.16 E-11
RF Atten Auto
Sets the RF attenuation automatically as a function of the selected reference level. This ensures
that the optimum RF attenuation is always used. It is the default setting.
Remote: INP:ATT:AUTO ON
Ref Level Offset
Opens an edit dialog box to enter the arithmetic level offset. This offset is added to the
measured level irrespective of the selected unit. The scaling of the y–axis is changed
accordingly. The setting range is ±200 dB in 0.1 dB steps.
Remote: DISP:WIND:TRAC:Y:RLEV:OFFS –10dB
Ref Level Position
Opens an edit dialog box to enter the reference level position, i.e. the position of the maximum
AD converter value on the level axis. The setting range is from –200 to +200%, 0%
corresponding to the lower and 100% to the upper limit of the diagram.
Remote: DISP:WIND:TRAC:Y:RPOS 100PCT
Grid Abs / Rel (not available with Range Linear)
Switches between absolute and relative scaling of the level axis.
Absolute scaling The labeling of the level lines refers to the absolute value of the
reference level. Absolute scaling is the default setting.
Relative scaling The upper line of the grid is always at 0 dB. The scaling is in dB
whereas the reference level is always in the set unit (for details on unit
settings see Unit softkey).
Remote: DISP:WIND:TRAC:Y:MODE ABS
Unit
Opens the Unit dialog box to select the unit for the level axis. The default setting is dBm. If a
transducer is switched on, the softkey is not available.
In general, the spectrum analyzer measures the signal voltage at the RF input. The level display
is calibrated in RMS values of an unmodulated sinewave signal. In the default state, the level is
displayed at a power of 1 mW (= dBm). Via the known input impedance (50 L or 75 L),
conversion to other units is possible. The units dBm, dBmV, dBµV, V and W are directly
convertible.
Remote: CALC:UNIT:POW DBM
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