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Resistivity meter 2003

:: EPE Chat Zone ­:: ­Radio Bygones Message Board :: » EPE Forum Archives 2007-2009 » Archive through 05 February, 2007 » Resistivity meter 2003 « Previous Next »

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Xenington
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Posted on Tuesday, 30 January, 2007 - 12:08 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

Hello All
This is my first post on this forum and I would like to say hello to everyone. Being a newbie to electronics some of my questions will be obvious and stupid, please bear with me.
To celebrate my first post I would like to ask some advice.
I am building John Becker's resitivity logger that featured in EPE April/May 2003. In part 2 of the article, it mentions an option called 'survey current monitoring' which may enhance the survey results. I was wondering if anyone had tried this and is it worth doing? When adding this feature, the article mentions connecting the open end of R16 to the 'pole' of S2, does that mean 'pole A' of S2?
Thank you for your assistance
Yours
Dean
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John_becker
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Posted on Tuesday, 30 January, 2007 - 12:29 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

Hi Dean, welcome.

Sorry but it's a long time since I designed that one, but looking at the circuit only one pole of S2 is used. The other(s), if any, and their "ways" are unused, so I guess the answer is "yes".

I cant speak for the benefits of current monitoring. Although I designed the unit, I am not an archeologist

J
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Xenington
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Posted on Tuesday, 30 January, 2007 - 12:46 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

OK, thank you
I will give it a go anyway and report back.
Cheers
Dean

PS. ever thought about doing a multiplexer?
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John_becker
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Posted on Tuesday, 30 January, 2007 - 06:35 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

In what sense Dean? A lot of my designs use multiplexing in some form or other.

J
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Xenington
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Posted on Tuesday, 30 January, 2007 - 09:11 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

The latest resistivity meters use a device called a 'multiplexer'. This allows an array of probes to be used with different spacings and combinations (twin, Wenner, double dipole). It takes a measurement using each combination at each survey point. It is like doing a survey using lots of different machines, but in one go. The data is stored and downloaded separately. Then it can analysed separately or combined.

Didn't anyone report back about the current monitoring option?

How is Nick Tile getting on with his meter?

Cheers
Dean
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John_becker
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Posted on Tuesday, 30 January, 2007 - 11:51 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

It's too loose a term Dean to have any meaning except to those in the know on the ER topic. I shant get involved.

No reports back on that current aspect.

A while since heard from Nick, but he's had to be involved elsewhere last time I heard, thanks

J

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