Reply to "Conventional problems on new DCS/TMCC layout - TIU PROBLEM?"

gunrunnerjohnOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

What's the output voltage of the LW when you measure it directly? The TIU "assumes" 22V input when computes the voltage shown for conventional running. However, if the LW is only putting out 18V, then the TIU will lie to you at a 20% over statement of the voltage.

Another point. Under any load, the TIU drops a volt & a half or so through the variable channels, however if you measure the output no-load, it varies very little from the input.

Transformer output on the left and TIU output on the right with no external load.

Transformer output on the left and TIU output on the right with 2A external load.

Note that the TIU drops about a volt and a half with any significant current flowing through the variable channels.

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12/9/216:08 PM

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Transformer output on the left and TIU output on the right with no external load.

Transformer output on the left and TIU output on the right with 2A external load.

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