R
&S FSH outputs a message requesting the
termination of the measurement port into a short circuit
(SHORT).
Terminate the measurement input of the bridge or
the end of the measurement cable into a short
c
ircuit.
Start the short-circuit calibration by pressing
CONTINUE.
In the third step of calibration, terminate the
measurement port into a 50 termination.
Terminate the measurement input of the bridge or
the end of the measurement cable into a
50 termination (LOAD)
Start termination calibration by pressing
CONTINUE.
When calibration is done, the R&S FSH outputs the
message "Reflect. calibrated" for three seconds.
REFLECTION VECTOR (CAL) is displayed in the
upper area of the diagram.
This indicates that the R&S FSH is vector-calibrated
for reflection measurements.
The reflection calibration remains valid until the center frequency or the span is changed on the
R&S FSH to such an extent that the new span falls outside the calibrated frequency range. UNCAL is
displayed in the upper area of the screen when calibration is no longer valid.
If the reference level is changed (AMPT key, REF LEVEL softkey) after calibration, greater
measurement uncertainty must be anticipated. The R&S FSH retains the calibration data but indicates a
possible increase in measurement uncertainty by displaying APPROX in the upper area of the screen.
A change in sweep time does not affect reflection measurement.
Measuring the reflection magnitude
Connect the DUT to the test port of the VSWR bridge.
Press the FORMAT softkey.
Using the rotary knob or the cursor keys, select
MAGNITUDE from the menu and confirm by
pressing either the FORMAT softkey or the
ENTER key.
The R&S FSH shows the return loss magnitude in the
upper area of the display.
The changing of the display unit and the scaling of the
display are described in the section "Scalar
measurement of reflection".
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