who can decipher these scope readings?

[punagold]

channel 1 (blue) is my TX on my ATX
channel 2 (yellow) is my RX on my ATX

Got some warning I was out of range but switched to x10 on the probes and changed setting but never got a clear pic of wave? Don't know what the hell do do at this point. I get no response from my coil waving metal nearby.

[Silver Dollar]

Well either you have one of those new Zero Voltage coils or your triggering is not working...

[punagold]

run 1 and 4 (TX) , I thought were showing 40-48 volts. I switched the probe from one side of the coil to the other. Run 2 and 3 (RX) are showing -38 volts or so, whatever that means. Again, I switched the probe from one side of the coil to the other. If you look at the top of the screen you sill see that I have "no trigger" in the box. Could that be the problem? When I hook the scope to the test piece that puts out some voltage on the scope itself, I can see the square sign wave.

Please take note of my setting on the scope. Are they even close to where they should be?

Also, my detector runs on 8--1.5 volt AA batteries. Although they only charge up to about 1.39 volts. So 8x1.39= 11.12 How does the detector jump that up to 40-50 volts?

Sorry for the dumb questions. This is all new to me. But I would like to figure this out. Maybe I need to ground one end of the RX to the ground on my coax????

[Silver Dollar]

Well the new mode for PI is to use +75V and -75V to get a fast large swing on the pulse.

There are tons of switching power supply chips around to make higher voltages. I don't
know anything about the ATX but I would try to get a trigger to see the pulse...

The coil might not be needed but a load might be necessary.

[punagold]

okay, I figured out the trigger thing. Also got my setting better. I have my coil somewhat working. Works great on silver ring, very weak in gold ring. nickle not picked up at all. I know I need to balance the rx and tx. Not sure how with scope. Also, I need to calculate how to figure out the balancing resistor. Latest scope pics. Any suggestions?








yellow is rx, blue tx

[punagold]

my detector was falsing, rx2 I think shows that. Is this from my damping resistor?

[punagold]

I also wanted to point out that in the rx1 and rx2 photo, I was not waving any metal by the coil.