Tracking Generator
R&S
®
ESR
492User Manual 1175.7068.02 ─ 12
Frequency Min.
For reference only: Lower frequency limit for the generator.
Frequency Max.
For reference only: Upper frequency limit for the generator.
Power Min.
For reference only: Lower power limit for the generator.
Power Max.
For reference only: Upper power limit for the generator.
8.4 Tracking Generator Functions
The following functions are available if the optional Tracking Generator or the optional
External Tracking Generator is installed.
● Calibration mechanism..........................................................................................492
● Calibrating for transmission and reflection measurement.....................................493
● Transmission measurement..................................................................................494
● Reflection measurement....................................................................................... 494
● Normalization........................................................................................................ 494
● Modulation (internal Tracking Generator only)......................................................498
8.4.1 Calibration mechanism
Calibration means calculating the difference between the currently measured power
and a reference curve, independent of the selected type of measurement (transmis-
sion/reflection). The hardware settings used for measuring the reference curve are
included in the reference dataset.
Even with normalization switched on, the instrument 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.
Therefore, the reference dataset (trace with n measured values, where n is the number
of Sweep Points) is stored internally as a table of n points (frequency/level).
Differences in level settings between the reference curve and the current instrument
settings are taken into account automatically. If the span is reduced, a linear interpola-
tion of the intermediate values is applied. If the span increases, the values at the left or
right border of the reference dataset are extrapolated to the current start or stop fre-
quency, i.e. the reference dataset 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 if normalization is
switched on and a deviation from the reference setting occurs. Three accuracy levels
are defined:
Tracking Generator Functions
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