R&S FSMR, Operating Manual

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Level Display / RF Input R&S FSMR
1166.3363.12 4.7-2 E-2
RANGE
LINEAR
The RANGE LINEAR softkey selects linear scaling for the level display range
of the analyzer. In addition, it opens a submenu for selecting % or dB for the
scaling.
When linear scaling is selected, the % scaling is first activated (see also
RANGE LINEAR dB softkey).
IEC/IEEE-bus command:
DISP:WIND:TRAC:Y:SPAC LIN
RANGE
LINEAR %
The RANGE LINEAR % softkey selects linear scaling in % for the level
display range, i.e. the horizontal lines are labelled in %. The grid is divided in
decadic steps. Markers are displayed in the selected unit; delta markers are
displayed in % referenced to the voltage value at the position of marker 1.
IEC/IEEE-bus command:
DISP:WIND:TRAC:Y:SPAC LIN
RANGE
LINEAR dB
The RANGE LINEAR dB softkey selects linear scaling in dB for the level
display range, i.e. the horizontal lines are labelled in dB.
Markers are displayed in the selected unit; delta markers are displayed in dB
referenced to the power value at the position of marker 1.
IEC/IEEE-bus command:
DISP:WIND:TRAC:Y:SPAC LDB
UNIT
dBm
dB V
dB A
VOLT
AMPERE
WATT
dBpW
dBmV
The UNIT softkey opens a sub menu allowing to select the
unit for the level axis.
The default setting is dBm.
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 resistance of 50
or 75 , conversion to
other units is possible. The units dBm, dBmV, dB
µ
V, dB
µ
A,
dBpW, V, A and W are directly convertible.
IEC/IEEE-bus command:
CALC:UNIT:POW DBM