R&S ESU Series, Operating Manual

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R&S ESU Instrument Functions
External Generator Control – Option R&S FSP-B10
4.342 Operating Manual 1302.6163.12 - 03
Table 4-8 Measurement accuracy levels
Accuracy Enhancement
label Reason/Limitation
High NOR No difference between reference setting and measurement
Medium APX
(approximation) Change of the following settings:
• coupling (RBW, VBW, SWT)
• reference level, RF attenuation
• start or stop frequency
• output level of tracking generator
• frequency offset of tracking generator
• detector (max. peak, min. peak, sample, etc.)
Change of frequency:
• max. 625 points within the set sweep limits (corresponds to
a doubling of the span)
- Aborted
normalization • more than 500 extrapolated points within the current sweep
limits (in case of span doubling)
At a reference level ( REF LEVEL ) of -10 dBm and at a tracking generator output
level of the same value the analyzer operates without overrange reserve, i.e. the
analyzer is in danger of being overloaded if a signal is applied whose amplitude is
higher than the reference line. In this case, either the message
OVLD for overload
is displayed in the status line or the display range is exceeded (clipping of the trace
at the upper diagram border = Overrange).
Overloading can be avoided as follows:
• Reducing the output level of the tracking generator ( SOURCE POWER ,
NETWORK menu)
• Increasing the reference level ( REF LEVEL , AMPT menu)