Two-port measurements with the tracking generator
R&S FSH
1145.5973.12 4.94
E-11
Confirm the selection by pressing the ENTER key or
the RANGE softkey.
The R&S FSH displays the reflection coefficient of the
DUT.
Reflection calibration remains valid until the R&S FSH’s center frequency or span is changed. If
calibration becomes invalid, the R&S FSH displays Track Gen Uncal in the top right-hand corner of
the screen.
If the reference is changed after calibration, a larger measurement uncertainty must be anticipated. The
R&S FSH retains the calibration data but places a red dot before the Reflection display in the top right-
hand corner of the screen (
•
Reflection) to indicate a possible increase in measurement uncertainty up
to 0.3 dB.
Changing other parameters like bandwidth, detector, sweep time or measurement range has no effect
on measurement accuracy. This means they can be changed after calibration without any reduction in
accuracy.
When a data set for scalar reflection measurement is stored with calibration performed, the calibration
data can be stored along with the other settings (see Chapter 2, section "Saving Calibration Data").
When such a data set is recalled, measurements can be performed without prior calibration, providing
the instrument's temperature does not deviate more than 5 °C from its temperature when the data set
was stored.
If the temperature deviation is greater, the R&S FSH outputs a (red) dot in front of
•
Reflection . A
precise measurement can then only be made after a calibration.
Vector measurement of reflection
(only available with option R&S FSH-K2)
Unlike with scalar measurement, the R&S FSH corrects the waveform reflected by the DUT according
to magnitude and phase by means of the correction values obtained from calibration. In addition to
