R&S FSQ Signal Analyzer - Rohde & Schwarz

R&S FSQ Instrument Functions
CAL REFL
OPEN
The message is cleared after approx. 3 seconds.
Remote command: CORR:METH REFL
CORR:COLL THR
Tracking Generator – Option R&S FSU-B9
The CAL REFL OPEN softkey starts the open-circuit calibration. During calibration
the following message is displayed:
Remote command: CORR:METH REFL
CORR:COLL OPEN
4.7.4 Calibration Mechanism
Calibration means a calculation of the difference between the currently measured
power and a reference curve, independent of the selected type of measurement
(transmission/reflection). The hardware settings used for measuring the reference
curve are included in the reference data set.
Even with normalization switched on, the device settings can be changed in a wide
area without stopping the normalization. This reduces the necessity to carry out a
new normalization to a minimum.
For this purpose the reference dataset (trace with 625 measured values) is stored
internally as a table of 625 points (frequency/level).
Differences in level settings between the reference curve and the current device settings
are taken into account automatically. If the span is reduced, a linear interpolation
of the intermediate values is applied. If the span increases, the values at the left
or right border of the reference data set are extrapolated to the current start or stop
frequency, i.e. the reference data set is extended by constant values.
An enhancement label is used to mark the different levels of measurement accuracy.
This enhancement label is displayed at the right diagram border when normalization
is switched on and a deviation from the reference setting occurs. Three
accuracy levels are defined:
Table 4-6 Measurement accuracy levels
Accuracy Enhancement
label
Reason/Limitation
High NOR No difference between reference setting and
measurement
Operating Manual 1313.9681.12 - 01 4.229