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Offline numisNGSTopic starter
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« on: August 06, 2017, 10:43:04 am »
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hello. Can someonetelle me is the coil nulling like that or I have to connectr RX to the pcband measure ?

RX at the left hand and TX at the right hand .
please help
best regards

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coil nulling with DVM.jpg


« Last Edit: August 06, 2017, 10:51:02 am by numisNGS »
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Offline homefire
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« Reply #1 on: August 06, 2017, 11:01:18 am »
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   Yes the Initial Null is best completed with the Rx coil Unconnected measured with a DVM or other Meter.  Later you can measure with coil connected on the output of first Op Amp if needed.

What detector are you working on ?

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« Last Edit: August 06, 2017, 11:18:07 am by homefire »
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Offline numisNGSTopic starter
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« Reply #2 on: August 06, 2017, 01:58:11 pm »
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I work on many metal detectors: TGSL,Eldorado,IDX pro,and SMW . but I have a problem with coil nulling but now as you said the nulling is like I drown in the pic ,now I'll try and tell you what hapen . by the way I have an old analog oscilloscope "gold star os 7020A" and not a DVM.
thank you very much homefire .
best reggards.

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« Reply #3 on: August 06, 2017, 02:02:39 pm »
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   O Scopes are the One Size Fits All Test gear if your good with one.   Grin

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Offline numisNGSTopic starter
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« Reply #4 on: August 07, 2017, 10:07:00 am »
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 Wink yes of course. thank you homefire
best regards

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