I wanted to know if it is possible to test a length of wire for continuity at a low voltage while at the same time testing the same piece of wire for leakage with a very high voltage. I conneceted the following circuit:
top right: my homemade continuity tester, 4AA batteries, 8.5K resistor, green 3mm LED
Left: a resistor to simulate a very long piece of wire
So, in position A with the megger unshorted, My LED would stay on, which is what I want. I want the wire charging at 1kv with the megger, while checking continuity with 4.5V.
In position B, My LED turned OFF, which is what I expected would happen, as the greater 1KV would see the opposing 4.5 V as a resistance in parallel with it and try to pass through it, being stopped by the diode.
So, my question(S) are:
.Is this really working for the reason that I think it's working, or is there something else going on here that I haven't accounted for.
.Does anything about this go against any written/unwritten rules for building circuits (or, plainly, is it a good circuit?)
. would this behave the same way if I were to replace the battery in the continuity tester with an ac/dc converter @6v?
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Thanks!
Charlie
![](/proxy.php?image=http%3A%2F%2Fi273.photobucket.com%2Falbums%2Fjj238%2Fstrantor%2Fcontleakage-1.jpg&hash=995279adda9634e2ac847673cbf2241b)
top right: my homemade continuity tester, 4AA batteries, 8.5K resistor, green 3mm LED
Left: a resistor to simulate a very long piece of wire
So, in position A with the megger unshorted, My LED would stay on, which is what I want. I want the wire charging at 1kv with the megger, while checking continuity with 4.5V.
In position B, My LED turned OFF, which is what I expected would happen, as the greater 1KV would see the opposing 4.5 V as a resistance in parallel with it and try to pass through it, being stopped by the diode.
So, my question(S) are:
.Is this really working for the reason that I think it's working, or is there something else going on here that I haven't accounted for.
.Does anything about this go against any written/unwritten rules for building circuits (or, plainly, is it a good circuit?)
. would this behave the same way if I were to replace the battery in the continuity tester with an ac/dc converter @6v?
\
Thanks!
Charlie