TGSL Coil testing with oscilloscope and multi meter

[yatahaze323]

Hey Everyone,

I've had my board populated for awhile and I finally got access to an oscilloscope. I'm still learning how to use the scope but I'm getting the hang of some of the features.
I'm at the point where I'm building the coil, I built a wood former similar to the one in the manual in the sticky post. Right now I have the TX coil wrapped on it. However I'm unsure how to test the coil using the oscilloscope. So I connected the TX coil to the pcb and hooked it up to the Oscope. I believe I was able to measure the TX transmitter(see the attached picture) but does that also measure the TX resonance for the coil?



I also have had this multi meter for a long time https://www.innova.com/en-US/Product/Detail/3320which I'm also trying to figure out if it will work for the Inductance and resistance of the coils. Does this multi meter look like it would work?

Thank you everyone for your help!

[rickb]

"I also have had this multi meter for a long time https://www.innova.com/en-US/Product/Detail/3320 I'm also trying to figure out if it will work for the Inductance and resistance of the coils. Does this multi meter look like it would work?"

It does not have inductance measurement ability.
The scope shows the osc. frequency, and that with the known capacitance will allow you to calculate the inductance.
Resistance can be measured with a resolution of .1 ohm.

[yatahaze323]

Hey Everyone,

Ok so I reread the TGSL 101 pdf and now I realized that I jumped ahead and didn't read part of it. I now understand that the measurement of 14.5 khz that I got from the Oscilloscope was a way to measure if the coil had the correct inductance.

Thanks for the input Rick!

[Koala]

If you disconnected the TX and substituted the RX coil in it's place you should get a frequency of 13.9kHz (RX Coil connected TX circuit)

This is the method i use and not had a failure for phase.

[yatahaze323]

Koala, Yes! I read this in the TGSL 101 manual as well, I'll be doing that once finish winding the RX coil. Thanks for the advice!