R&S FSH
Measurements on CW Signals
1145.5973.12 2.13
E-11
The transmission 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 upper 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 in front of the
•
Reflection display to
indicates possible increase in measurement uncertainty.
When saving a data set for a scalar reflection measurement in a calibrated state, the R&S FSH can
store the calibration data along with the other settings (see section "Saving Calibration Data"). Thus,
after the setting is recalled, a measurement can be performed without prior calibration, provided that 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 be made only after a calibration.
