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Offline mercersTopic starter
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« on: July 08, 2009, 02:49:44 pm »
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 Hello Is this schematics any good.

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Offline Christian
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« Reply #1 on: July 08, 2009, 03:50:15 pm »
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Well, if you could let us know please what this shematic is for in teh first place, this would help. Thank you

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« Reply #2 on: July 08, 2009, 03:53:54 pm »
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Christian It for a mangenometer
mercers

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« Reply #3 on: July 09, 2009, 07:49:42 am »
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Hi,

Is this the schematics of an operational PPM system?
If it is, when was it designed and built?

Willy

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Offline Eugene52
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« Reply #4 on: July 09, 2009, 10:36:19 am »
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Quote:Posted by willy bayot
Hi,

Is this the schematics of an operational PPM system?
If it is, when was it designed and built?

Willy


Hello . About 5 months ago I saw all those schematics on a Website I forgot about . It would be nice if someone posted the link that has more information . Maybe the project was never completed ?....Regards.......Eugene

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Offline willy bayot
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« Reply #5 on: July 09, 2009, 11:37:29 am »
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This is a smart piece of analog circuitry and is based on unsophisticated and cheap components. Thus, it could possibly be used for lab experimentations in magnetic field measurements but I already see a few potential (real!) problems in it if it would be used for any practical use:
1. Polarization switching through relay will shortly give operational problems due to the fast wearing of its contacts.
2. Frequency measurement by period counting is very prone to imprecision due to spikes in the amplified signal.
3. Even in the high resolution mode of 0.1Hz, this can only give a precision of 2.5nT in the best case.
4. The pre-set measurement period of 8 seconds is incompatible with a walking operator
5. The lack of measurement recording or even of any potential connectio to an external data logger makes this system unusable for surveys.

It would be easy to cure the problem 1 by replacing the relay by a few HEXFET's making the switching perfectly static.
The problem 2 is MUCH more difficult to solve without any data processor. You just need to cross your fingers and hope that the environmental noise does not generate any spikes. A single signal period missed or added generates an error of 23nT!!!
With such a circuit, I do not think it would be possible to get a precision down to 1nT, thus, the problem 3 is not really solvable on this base.
The problem 4 is not really a problem provided the right type of proton-rich fluid is being used allowing a much shorter polarization period to be used.
The problem 5 needs to be solved by the use of a digital processor in order to at least provide a serial link to an external data logger.

Willy

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« Reply #6 on: July 10, 2009, 07:33:00 am »
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mercers;

It looks vaguely familiar.... I want to study it before replying. Its kind of small, on my lap top
Aspire-one... my picture view is 4.5 by 7.625 inches and the schematics are about 2x2 in!

I take stuff to my desk top and look at them with a 17 in monitor, lots of difference!

Brian AKA goldigger (cautious, too)

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« Reply #7 on: July 14, 2009, 10:47:04 am »
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 [hello]I have no idea
Mercers

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« Reply #8 on: July 14, 2009, 10:49:54 am »
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 Hello Golddigger
Can i try to build it or is it goneing to be a waste of time
Mercers

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« Reply #9 on: July 14, 2009, 11:12:51 am »
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mercers;

I hate to say yes-or-no on should-YOU-use-it, I would not, as the system is old, it probably worked OK, but there are better schemes, available. The counter idea is archaic.

I, personally speaking, here, would rather use phase detection and convert the response to digital with an ADC.... this allows many more advantages. Not that my circuitry would be much less complex, probably.

Yes, I also, have seen this very circuit , some where, before..... it was used as an OUTMODED example, that employing a counter. I wonder how it got into active circulation, represented as a viable system???

I hope this helps.

Brian AKA goldigger

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