20
Tel: 886.909 602 109 Email: [email protected]
6. After the Port 1 is calibrated, connect the measured cable to the Analyzer to ensure the accuracy of cable loss measurement.
Terminal of the measured cable shall connect to the open circuit or short circuit, as shown in Figure 3.8.
Figure 3.8 Cable Loss Test Connection Diagram
Cable loss curve of the measured cable can be obtained through above steps. The so-called average loss refers to average the
measured extreme values of loss. Users can use
【
Marker
】
to find peak value and valley value of the loss curve, then average
them, and finally obtain the average loss of the cable. Limit value search process is as follows:
Press
【
Marker
】
to enter the marker menu, and the Marker 1 defaults to be in open state at this time;
Select [Peak] menu to place Marker 1 onto the peak position of the cable loss curve;
Select [Marker 1 2 3 4 5 6] menu again, the menu becomes into [Marker 1 2 3 4 5 6] at this time, and then select [Marker Off
On] menu to open Marker 2;
Select [Valley] menu to place Marker 2 onto the peak position of the cable loss curve;
Upon the cable loss values shown by Marker 1 and Marker 2, sum and average them to obtain average loss of the cable.
3.2.3.
DTF Measurement
DTF (Distance To Fault) measurement, also called fault point location measurement, is a kind of performance verification and fault
analysis tool in the maintenance and repair process of antenna and transmission line. DTF function of S3101A/B is realized by
adopting the measurement technique named Frequency-Domain Reflectometry. In engineering applications, DTF measurement
usually adopts the connection type shown in Figure 3.9 to measure the fault point status of connection cables of devices such as
base stations, etc.
Figure 3.9 DTF Measurement Connection
Connector
Fault point
Antenna
