Operation - Megger TDR1000 Guia Del Usuario

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Operation

Ensure the test leads are firmly fitted into the sockets of the instrument. Connect the test lead to the cable under test. If working on live power

cables a blocking filter must be used to isolate the instrument from the live line. When used in 25Ω mode, the internal balance circuit expects

the blocking filter to be used. If not fitted achieving balance may not be possible and the instrument will not be isolated from the cable under

test. This will result in erroneous result and could result in damage to the instrument or user if the cable is live.

Switch the instrument on and the instrument will display the start screen for a couple of seconds. The TDR will then display a trace. The

instrument will have powered up, set to the last used range and velocity factor. If these settings are different for the cable under test (C.U.T)

then use the menu and cursor keys to set the correct values. The menu key is bi-directional and allows you to cycle through the various settings,

the current setting shown in reverse video and named in the top left-hand corner of the display. Having highlighted the required parameter, e.g.

range or velocity factor, use the left and right cursor keys to correct the settings for the C.U.T.

With the gain set at the lowest level required to easily identify the cable feature, e.g. an open or closed circuit, move the cursor to the very

beginning of the reflection. This is done by using the Menu key to set the instrument into Cursor mode and then using the left and right cursor

keys to set the cursor position. The distance is then directly read from the display. The distance calculation is performed using the current

velocity factor. If this velocity factor is not correct, the displayed distance will be incorrect.

To enable partial cable faults to be identified, the gain of the instrument can be adjusted. With the gain at minimum the end of the cable should

be seen on the trace, if a minor fault is suspected then increase the gain until the fault is more visible.

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