Instrument Functions
R&S
®
FSVA/FSV
521Operating Manual 1176.7510.02 ─ 09
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the assigned band name
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the harmonic order
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the mixer type
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the table must contain at least one frequency that lies within the frequency range
for the band
3.8.1.4 Full Screen Level
The maximum possible reference level depends on the maximum used conversion loss
value. Thus, the reference level can be adjusted for each range according to the used
conversion loss table or average conversion loss value. If a conversion loss value is
used which exceeds the maximum reference level, the reference level is adjusted to
the maximum value permitted by the firmware.
3.8.1.5 Remarks on Signal Identification with Auto ID
Test sweep and reference sweep
Depending on which of the automatic signal identification functions are used, the
traces are used to display either the test sweep (the upper side-band sweep) or the ref-
erence sweep (lower side-band sweep).
Function Trace 1 Trace 2 Trace 3
Signal ID Signal ID upper side-band Signal ID lower side-band -
Auto ID Auto ID - -
Signal ID + Auto ID Signal ID upper side-band Signal ID lower side-band Auto ID
Type of signal
The automatic comparison of the test sweep and reference sweep with the "Auto ID"
function can only be usefully applied for signals with time-constant spectrum since the
two sweeps are always required to determine the actual spectrum.
Tolerance for the comparison of test sweep and reference
Since the LO frequency is displaced downwards in the reference sweep, the conver-
sion loss of the mixer may differ from that of the test sweep. The reasons for this are
the LO output power of the R&S FSV varying with the frequency and the non-ideal
characteristics of the mixer. A certain tolerance should therefore be permitted for the
comparison of the signal levels in the test sweep and reference sweep. The user can
set this tolerance using the "AUTO ID THRESHOLD" function. If the tolerance is
defined too narrow, the signal collected with the reference sweep may be displayed
even for the identification of real signals.
Instrument Functions – External Mixer (Option R&S FSV-B21)
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