Output Test - Electronic Circuits Projects Diagrams Free

codan · 7th April 2008, 08:44 AM

Hi all,

I have a metal detector that i want to test the output to the coil.

There is a circular 5 pin plug that the search coil plugs into, the pins are numbered 1 through 5 in an anticlockwise direction.
I would like to determine which pins are the output voltage pins to the search coil etc, the detector is a Minelab GP3500.

Is this as straight forward as just making contact with the pins with a multimeter, can any damage occur by doing this??

Thank You

Brian218 · 8th April 2008, 05:15 AM

You should be able to measure it with a DMM, but keep in mind the coil uses higher frequency signals than alot of AC circuits. I think some detectors use frequencies upwards of 25-100 KHz or so. If you have access to one, an O-scope would probably be a better choice than a multimeter.

Relax, You won't do any damage by trying to measure the signal.

codan · 8th April 2008, 01:24 PM

Thanks Brian218,

I have a PC based O-scope that i can use to test it out.

I am guessing that with the 5 pin connector that 2 pins would be for the transmit voltage to the search coil, 2 pins would be for the reciever signal pins & the other one an earth-ground pin.
Does this make sense?

Thanks again

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7th April 2008, 08:44 AM	(permalink)
codan	Output Test Hi all, I have a metal detector that i want to test the output to the coil. There is a circular 5 pin plug that the search coil plugs into, the pins are numbered 1 through 5 in an anticlockwise direction. I would like to determine which pins are the output voltage pins to the search coil etc, the detector is a Minelab GP3500. Is this as straight forward as just making contact with the pins with a multimeter, can any damage occur by doing this?? Thank You

8th April 2008, 05:15 AM	(permalink)
Brian218	You should be able to measure it with a DMM, but keep in mind the coil uses higher frequency signals than alot of AC circuits. I think some detectors use frequencies upwards of 25-100 KHz or so. If you have access to one, an O-scope would probably be a better choice than a multimeter. Relax, You won't do any damage by trying to measure the signal.

8th April 2008, 01:24 PM	(permalink)
codan	Thanks Brian218, I have a PC based O-scope that i can use to test it out. I am guessing that with the 5 pin connector that 2 pins would be for the transmit voltage to the search coil, 2 pins would be for the reciever signal pins & the other one an earth-ground pin. Does this make sense? Thanks again