Measurements on CW Signals R&S FSH3
Please refer to the cable manufacturer's data sheet for the velocity factor (= speed of the wave in the
cable relative to the speed of light) and the attenuation of the cable per meter or per foot at the specified
frequency.
¾ Use the EXIT softkey to exit the menu for defining the cable model.
The analyzer returns to the DTF measurement menu and displays the cable used for the measurement
in the top right-hand corner of the screen.
The R&S FSH3 uses the cable length to determine the optimal span for the measurement and for
scaling the x-axis in DTF mode. For best results the cable should be specified 20 to 50 % longer than
the actual cable length.
¾ Press the CABLE LENGTH softkey.
The R&S FSH3 opens the cable length (CABLE LEN)
value entry box and displays the current length setting.
¾ Using the number keys, enter the cable length in
meters and terminate the entry with the ENTER key
or one of the unit keys, or
¾ Using the Rotary knob (1 m steps) or the Cursor
keys (10 m steps) adjust the cable length.
If the unit of length is set to Feet (via SETUP: LOCAL
SETTINGS), the entry is in "Feet".
The minimum cable length is 3 m. The maximum
settable cable length is 1000 m.
N.B.: The cable length should always be entered before the test setup is calibrated. If it is
entered afterwards, the measurement accuracy is reduced.
1145.5973.12 2.16 E-6
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