Example 2

General Information : Cable and Antenna Analyzer : Distance-to-Fault (DTF) : Example 2

Example 2

Distance-To-Fault Transmission Line Test

The Distance-To-Fault transmission line test verifies the performance of the transmission line assembly (for example, RF feedline and jumper cables) and its components and identifies the fault locations in the transmission line system. This test determines the return loss value of each connector pair, cable component and cable to identify the problem location. This test can be performed in the DTF-Return Loss or DTF-VSWR mode. Typically, for field applications, the DTF-Return Loss mode is used. To perform this test, disconnect the antenna and connect the load at the end of the transmission line.

Procedure

1.

Press the Measurement main menu key and press DTF Return Loss.

2.

Press the Freq/Dist main menu key and set the Start Dist and Stop Dist.

3.

Press the Units submenu key to select meters or feet. The factory default is meters.

4.

Press the Sweep/Setup main menu, then the Data Points submenu key to select the number of Data Points. The default is 275.

5.

Press the Start Freq and Stop Freq submenu keys and enter the desired frequencies.

6.

Press the Measurement main menu key then press DTF Return Loss.

7.

Press the More submenu key.

8.

Press the Cable submenu key and select the desired cable. The unit automatically sets the cable propagation velocity and cable loss.

Note

If the desired cable is not on the list, use the Master Software Tools Cable Editor to add the new cable information and load the list into the unit. Selecting the right propagation velocity, attenuation factor and distance is very important for accurate measurements, otherwise the fault can not be accurately identified. Using the MST Cable Editor, all cable parameters may be entered manually.

9.

Press the Shift key, then the Calibrate (2) key.

10.

Press the Cal Type submenu key to set the calibration to 1-Port.

11.

Press the Start Cal submenu key and perform a 1-port OSL calibration at the connector or at end of the extension cable. Follow the instructions on the display. When the Calibration is finished, Cal Status On should be displayed in the upper left part of the display.

Note	If the desired cable is not on the list, use the Master Software Tools Cable Editor to add the new cable information and load the list into the unit. Selecting the right propagation velocity, attenuation factor and distance is very important for accurate measurements, otherwise the fault can not be accurately identified. Using the MST Cable Editor, all cable parameters may be entered manually.

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	Anritsu Company
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	10450-00024, Rev. B
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