Rohde & Schwarz R&S FSP Series, Руководство по эксплуатации

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Operating Manual 1164.4556.12 - 06 4.17
R&S FSP Instrument Functions
Analyzer Mode
MIXER LOW
NOISE
The MIXER LOW NOISE softkey changes the operating point of the input mixer so
that (with the RF attenuation remaining the same) the inherent noise of the
R&S FSP is reduced compared to the default setup. If the softkey is enabled, the
R&S FSP has an improved dynamic range above 3 GHz.
Remote command:
INP:ATT:AUTO:MODE LNO
REF LEVEL
POSITION
The REF LEVEL POSITION softkey allows the reference level position to be
entered.
The setting range is from -200 to +200%, 0% corresponding to the lower and 100%
to the upper limit of the diagram.
Remote command:
DISP:WIND:TRAC:RPOS 100PCT
REF LEVEL
OFFSET
The REF LEVEL OFFSET softkey allows the arithmetic level offset to be entered.
This offset is added to the measured level irrespective of the selected unit. The scal-
ing of the y-axis is changed accordingly.
The setting range is ±200 dB in 0.1 dB steps.
Remote command:
DISP:WIND:TRAC:RLEV:OFFS -10dB
Remote command:
GRID
(ABS REL)
The GRID (ABS REL) softkey switches between absolute and relative scaling of the
level axis.
GRID ABS is the default setting.
For setting RANGE LINEAR (linear scaling, labelling of axes in %) the softkey is not
displayed since the unit % itself implies a relative scale.
Remote command:
DISP:WIND:TRAC:Y:MODE ABS
4.5.3.1 Electronic Attenuator
Besides the mechanical attenuator at the RF input, the R&S FSP also offers an
electronic attenuation setting (option ELECTRONIC ATTENUATOR R&S FSP-B25).
The attenuation range is 0 to 30 dB, with the default attenuation being preset by the
mechanical attenuator.
EL ATTEN
MANUAL
The EL ATTEN MANUAL softkey switches the electronic attenuator on and allows
the attenuation of the electronic attenuator to be set.
• The function is available for models 13, 30 and 40.
• The modified operating point of the input mixer will be effective only if the start
frequency of the R&S FSP is
≥
3 GHz.
• In the default setting, the function is switched off.
ABS The labelling of the level lines refers to the absolute value of the reference
level.
REL 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
(dBm, dBmV,..).