S331L UG PN: 10580-00321 Rev. M 3-27
Cable and Antenna Measurements 3-5 Advanced Measurements
Transmission (Ext. Sensor)
To make more accurate cable loss measurements, especially for cables
with more than 10 dB of loss, you can use the Transmission
measurement with External Sensor. For this measurement, connect the
cable under test to the RF Out/Reflect In port of the Site Master, and
connect a USB power sensor to the other end of the cable. USB
extenders can be used for long cable runs. This measurement provides
accurate results of cable loss up to 30 dB. This is a scalar measurement,
providing only magnitude data (no phase) and, therefore, does not use
vector error correction for its calibration steps. Instead, it uses a sensor
reference calibration. Figure 3-22 is a cable loss measurement example
with an external sensor transmission.
For best results when performing both transmission and return loss
measurements on the same cable, the return loss should be measured
with a good-quality termination at the end of the cable.
Figure 3-22. External Sensor Transmission Measurement
Note
For a list of the external USB sensors that are supported by
the S331L for transmission measurements, see the S331L
Technical Data Sheet.
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