Earth Resistivity Meter

[ishtar hunter]

Hi to all
I built Earth resistivity logger device but I have trouble functioning.
How I can test this device? i can not view my test resistor ohm's
I connect with c1 to p1 a 1 ohm resistor and of c2 to p2 also 1 ohm resistor & with p1 to p2 a 10 ohm resistor , but i can not view my test resistor ohm's to display . the low and high reading of ic 4a and 4b is Large Numbers. When we want to find an anomaly(scan ground) if the test button will be OFF or ON?

[sohailahmadsgdpk]

hi capinrita
did you managed to found pcb and schematic ... if yes can you please share that with me
[email protected]

[rael]

Hi,


The Geoscan Research RM-15, using four electrode area, make data file calculating resistance.
Resistance to resistivity calculation, needed for Double-Dipole and Wenner measurement, is maked by Geoplot-3 software.
The EPE RM make data file depending condition of ADC.
I think, combination of EPE RM and four electrode areas is not successful.
Ten EPE RM is not better than one RM-15!

Conversion of resistance to apparent resistivity:
Wenner Multiply R by 3.1415 for resistivity with d = 0.5
Double-Dipole Multiply R by 9.4245 for resistivity with d = 0.5
Twin (mobile = remote separation) Multiply R by 1.5708 for resistivity with d = 0.5
Twin (remote >> mobile spacing) Multiply R by 3.1415 for resistivity with d = 0.5


For more look:

http://www.cast.uark.edu/nadag/EducationalMaterials/Bevan/Bevan1.pdf

http://gozips.uakron.edu/~matney/Use...0GeoPlot3s.pdf




Regards

[goldmont]

hi

can you use the EPE resistivity meter (2003) with Wenner and the enner-
Schlumberger arrays?

thanks

[goldmont]

[HI

i have a question, i am planning ti buils teh EPE earth resistivity logger, my question is if is it can works with the Wenner and the Wenner-chlumberger arrays?

thanks

[goldmont]

help please

HI

i want to know is is possible make the epe resistivity meter usin the PIC16F876 SMD, and the TL071 and tl074 too i only can get them in sms

[ikumi5]

Archeo surveyor w/ comdlg32.ocx fix!!!

[ikumi5]

Hello Alessandro,
look at this threads:

http://www.geotech1.com/forums/showthread.php?t=11415

http://www.geotech1.com/forums/showthread.php?t=10898

[capinrita]

resistivity meter (EPE2003)

hi
if some one have schematic and pcb of resistivity meter (EPE2003) please send to me .
[email protected]

tanX

[ygyssdsy]

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).
What was your expirence with this project. May i have your email to ask you a private question?
Here i´m sending to you pictures of my data logger.
Regards
motion detector PIR detector smoke detector gas detector
Wireless Alarm System
smoke alarm

[nelson]

PIC problem?

Hi Alessandro or anyone that can help me.
I think my problem with delays on the circuit is made by the pic tham i m using.
The project tells that you must use pic16f876. Mine has pic16876A.
Could this be the problem?
In advance many thanks
Regards
Nelson

Hi Nelson, i don't what the reason of delay but tou could check again all contacts with tester.If delay remains but the values on display are correct, you could test outside. Instead of using probes like the EPE RM part 2, you could use another configuration: for example use a 10m survey line where you put 20 o more 10cm long spikes and then you make measurements using a pole-dipole configuration for example. It's only an example (but it's zero cost!). The elaboration to have an soil image could be made with this software (see www.es.lancs.ac.uk/people/amb/Profiler/profiler.htm). Ask if you have any question so we can improve our survey. A.

[nelson]

ERM

Hi Alessandro and thanks for your response.
Yes i think i ll chek the circuit outside, after i plece it on a box.
After work today, i will try the software on the link you gave me.
For shure, i ll keep in touch with you to share my expirencies.
By the way, have you found anyhing with your ERM?
Regards
Nelson
Santiago, CHILE SA

Hi Nelson, i don't what the reason of delay but tou could check again all contacts with tester.If delay remains but the values on display are correct, you could test outside. Instead of using probes like the EPE RM part 2, you could use another configuration: for example use a 10m survey line where you put 20 o more 10cm long spikes and then you make measurements using a pole-dipole configuration for example. It's only an example (but it's zero cost!). The elaboration to have an soil image could be made with this software (see www.es.lancs.ac.uk/people/amb/Profiler/profiler.htm). Ask if you have any question so we can improve our survey. A.

[alessandro]

Earth resistivity meter from EPE

Hi Nelson, i don't what the reason of delay but tou could check again all contacts with tester.If delay remains but the values on display are correct, you could test outside. Instead of using probes like the EPE RM part 2, you could use another configuration: for example use a 10m survey line where you put 20 o more 10cm long spikes and then you make measurements using a pole-dipole configuration for example. It's only an example (but it's zero cost!). The elaboration to have an soil image could be made with this software (see www.es.lancs.ac.uk/people/amb/Profiler/profiler.htm). Ask if you have any question so we can improve our survey. A.

[nelson]

Earth resistivity meter from EPE

Hi Alessandro.
Today i just finish my ERM from EPE, and i have a few questions on how this device operate.
1.- When i turn the unit on, a delay or somethig happends, because the display turns on after 6 or 8 seconds.
2.- When you push S4, S5 or MODE buttons, also a delay btw pushes occur, about 6 seconds btw each push.
3.- The circuit is not mounted on a box yet.
4.- I didn´t made the test on real soil, it was just made on the desk.
5.- When the unit is on, the display shows what EPE saids. Also the commands to clear the memory, data transfer and so on, are working to.

Whel, if you have any idea on how to test this unit, i ll be very happy.
In advance, many thanks.
Regards
Nelson

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?

[alessandro]

Yes may be, and probably i made mistake to write data in the right order. i used Wenner array with 0.1 m spacing. In the next days i'll post something else.