R&S FSH3 Measurements on CW Signals
Calibrating the test setup:
The test setup must be calibrated before any measurements are performed.
¾ Press the DTF CAL softkey.
The R&S FSH3 opens a text window which prompts
the user to terminate the measurement cable with a
SHORT.
¾ Firmly screw the SHORT to the output end of the
measurement cable.
¾ Press the CONTINUE softkey to start the SHORT
calibration.
While SHORT calibration is in progress, the
R&S FSH3 outputs the message "Calibrating SHORT,
please wait...".
When calibration is over, the R&S FSH3 displays DTF CAL in the top right-hand corner of the screen.
Hint to the calibration:
The R&S FSH3 performs the calibration for its whole frequency range. Therefore, a new calibration is
not necessary after changing the cable length. The calibration data are stored in the R&S FSH3
memory. That way the calibration is valid after change of the operating mode or after switching off the
instrument. Precondition for a valid calibration is, that the instrument temperature does not change
more than 5 °C after calibration. In case of a higher temperature change the R&S FSH3 shows a red
dot in front of the • DTF display . A new calibration is recommended, then.
¾ Unscrew the short from the measurement cable.
¾ Screw the cable under test to the measurement cable.
The R&S FSH3 displays the reflections produced in the cable under test vs the distance.
The R&S FSH3 can also list any cable faults. It displays the return loss and distance from the
measurement plane of all reflections that exceed a settable threshold.
¾ Press the LIST VIEW softkey.
The R&S FSH3 opens the threshold value entry box
and also displays the threshold as a horizontal line
across the measurement diagram.
¾ Set the threshold using the Cursor keys (5 dB
steps), the Rotary knob (1 dB steps) or the number
keys.
1145.5973.12 2.17 E-6
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