Earth Resistivity Meter

[Geophyz]

hi, the first test i made with RM (EPE 2003) is in a model where i put 3 layer of soil and then i tried to processing with res2dinv but the error is too high and it's wrong on the left side of image, see below. Any suggest?

Very fun . Do you think your model might be flawed as it is not a true 1/2 space? Was your model deep enough for the probe spacing? What probe array did you use? What did the apparent resistivity "raw" data look like prior to res2dinv inverse problem? Also, try doing iteration with lower error than %35.

I don't know what to tell you but the data should not look like that. It almost looks like the left side of the res2dinv is upside down. Do you think the numbers on that side were reversed by accident?

[alessandro]

RM

hi, the first test i made with RM (EPE 2003) is in a model where i put 3 layer of soil and then i tried to processing with res2dinv but the error is too high and it's wrong on the left side of image, see below. Any suggest?

[Geophyz]

Hi. Ok TR Locator is a Russian version of a two box metal detector.
Nelson

Thanks for the info

[nelson]

TR locator

Hi. Ok TR Locator is a Russian version of a two box metal detector.
Now, Gary had modified this schematic and posted it here.
Regards
Nelson

May I ask what is the "TR Locator" project?

[Geophyz]

Hi Leto and congratulation for your work on ERM.
I´m working too on the Earth Resistivity Logger by John Becker, not finish yet. (Still working on my TR locator).

May I ask what is the "TR Locator" project?

Hi Leto,

I think, making stabile high voltage (>36V) charger is difficulty.
Two chargers (2x15 cells battery packs), In my opinion is possible solution.
Look this sites.

http://www.uoguelph.ca/~antoon/gadgets/ccharger.htm

http://www.uoguelph.ca/~antoon/gadgets/carnc12.htm

I use 12.6V 1.3 - 4 A/h lead accu, driving MC34063 based invertors.
Lead accu is easy to charge in any time as well as from car.

[Leto]

36V charger

ERM project needs +-18 Volt supply..
So it would be nice to have 36 Volts charger to charge both batteries at same time
-- but finding the shematic for it became real problem... --
Battery pack details: 30 cells, NICD, 1800mAh
Any schematic or link will be appreciated.

Hi Nelson, sorry for late,
the project didn't put some problems but it did not solve too, as soon as i can, i post some picture of results. bye. Alessandro

[Klaud]

Vumate

A good free program to display a xyz file in 3D is:

http://www.geo.vu.nl/users/weej/index.htm

[Leto]

Softaware

Hello Alessandro,
look at this threads:

https://www.geotech1.com/thuntings/showthread.php?t=11415

https://www.geotech1.com/thuntings/showthread.php?t=10898

and these pages:

http://www2.prestel.co.uk/aspen/sussex/snuffler.html

http://www.geoscan-research.co.uk/page22.html

http://www.cast.uark.edu/nadag/OtherLinks/otherLinks.htm

this is just a small selection of usefull links on these theme...
Most important:
Geophysical data files are really simple to figure out.. with simple notepad editor or better MS Excell you can exchange files between various software. (you'll also need lots of patience with this).

I usually use Snuffler but I export files often to ArcView as this is what I use in my job.

Rael made great job with his software .

[FONT='Arial','sans-serif'][/FONT]
[FONT='Arial','sans-serif']Hi,[/FONT]
[FONT='Arial','sans-serif'][/FONT]
[FONT='Arial','sans-serif']Please find attached software, who make "Snuffler", Archeo surveyor" data format files.[/FONT]
[FONT='Arial','sans-serif']I think the EPE RM is not very proper for Res2dinv software. Res2dinv support multy-electrode resistivity meters. Look EPE Software thread.[/FONT]
[FONT='Arial','sans-serif'][/FONT]
[FONT='Arial','sans-serif']Rael[/FONT]
[FONT='Arial','sans-serif'][/FONT][FONT='Arial','sans-serif'][/FONT]

ERM

Hi,

Please find attached software, who make "Snuffler", "Archeo surveyor" data format files.
I think the EPE RM is not very proper for Res2dinv software. Res2dinv support multi-electrode resistivity meters. Look EPE Software thread.

Rael

[nelson]

ERM

Hi Alessandro.
I m also building this ERM, so i want to know if this project puts any problem to you. Does it work?
About the software, i don´t know if there are any otrer that can run with this circuit.
Regards
Nelson

Hi, i've builded up J. the Becker resistivity meter (EPE2003) and i would to know if you tried to use some modelling software different from that used in the project as res2dinv and if you abtained some good results. Thanks. Alessandro

Hi, i've builded up J. the Becker resistivity meter (EPE2003) and i would to know if you tried to use some modelling software different from that used in the project as res2dinv and if you abtained some good results. Thanks. Alessandro

[Leto]

...

Hi Nelson,

Last question, is possible to have a copy of this poject.

Here is the link to Robert Beck's project:http://geotech.thunting.com/cgi-bin/...erm1/index.dat

May i have your email to ask you a private question?

All members can get my email adress - just click on my nickname Leto above this message.
There is separate thread on Earth Resistivity Logger by John Becker, you can also put any questions there.