Rohde & Schwarz R&S FSP Series, Operating Manual

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Operating Manual 1164.4556.12 - 06 4.217
R&S FSP Instrument Functions
Tracking Generator – Option R&S FSP-B9
Fig. 4.22 Normalized measurement, shifted with REF VALUE POSITION 50%
Remote command:
DISP:WIND:TRAC:Y:RPOS 10PCT
REF VALUE The REF VALUE softkey activates the input of a value which is assigned to the ref-
erence line.
With default settings the reference line corresponds to a difference of 0 dB between
the currently measured trace and the reference trace. Setting the
REF VALUE to a
different value helps to compensate for changes to the level conditions in the signal
path after the calibration data have been recorded. If e.g. after a source calibration a
10 dB attenuation is inserted into the signal path between DUT and R&S FSP input,
the measurement trace will be moved by 10 dB down. Entering a
REF VALUE of –
10 dB will then result in the reference line for difference calculation being moved by
10 dB down as well. This means that the measured trace will be placed on it, as dis-
played in
Fig. 4.23 .
REF VALUE always refers to the active window.