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VVM (Vector Voltmeter) Mode - Option 308
1-Port Cable Trimming Measurements
9. Press Marker then scroll the marker to the VVM frequency. The Y-axis
value is the phase difference in degrees between the Open standard and
the Short standard at that frequency. Remember this value!
10.Press Mode then VVM.
11.Connect the Short standard to the RF OUT calibration plane.
12.Press Meas Setup 4 then press Zero.
13.Connect the Open standard to the RF OUT calibration plane.
14.Confirm that magnitude measurement is less than –0.1 dB and the phase
is within 1 degrees of the value from step 9.
Perform Cable Trimming:
1. Attach the shortest cable to the FieldFox RF OUT connector. This cable is
the reference cable. Leave the end of the reference cable open
(unterminated).
2. Press Meas Setup 4 then press Zero.
3. Remove the reference cable from the FieldFox RF OUT connector.
4. Connect an unterminated, longer cable to the FieldFox RF OUT connector.
5. Observe the displayed phase difference between the reference cable and
the attached cable.8
6. Carefully trim the cable until the phase shift reads zero. The attached
cable's electrical length is now matched to the reference cable.
7. Repeat steps 4 through 6 for the remaining cables to be trimmed.
14- 10
Keysight N9912-90001 User's Guide
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