Testing for signal lines

[Carl-NC]

"MFD"-type LRLs typically have a signal generator for (supposedly) transmitting a signal of some sort that (supposedly) resonates with a desirable buried target. The signal is usually injected into the ground using a pair of ground probes, and detected using dowsing rods.

The purpose of this thread is to explore ways in which this theory can be both subjectively and objectively tested. Yes, I have a proposal which I'll get to, but I would like this to be open to everyone's input, to see what other ideas come out.

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Question #1...

When a person buys an MFD, how would they normally test the device?

Or, how would a manufacturer normally demonstrate an MFD?
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I'll try to dig up whatever product manuals I have, to see what they suggest.

- Carl

P.S. -- Those who don't want to participate in this discussion, need not reply at all. Stay on topic -- attempts to hijack this thread will simply be deleted.