EPE resistivity logger

[MohsenTM]

that is really true ivconic. i have near 2 year (not every day) time for convert simple EPE to automatic switching system EPE resistivity logger. and now I here and read your efforts.
I'm glad to have a discussion with you for this project...

[ivconic]

that is really true ivconic. i have near 2 year (not every day) time for convert simple EPE to automatic switching system EPE resistivity logger. and now I here and read your efforts.
I'm glad to have a discussion with you for this project...

I delayed my work. I tried swtching with conventional type of bilateral switches.
Thing is; those are having internal resistance, totally unacceptable for this purpose.
So i stopped with such idea and now trying to figure out something better.
Everything else about the device is easy job, codding will be the joy, after i solve the switching ranges.

[MohsenTM]

I delayed my work. I tried swtching with conventional type of bilateral switches.

yes at first i had this think. ivconic i came to the conclusion that a relays with low internal resistance should be used for switching...at every probe (if we want use multi probe switching) we should use 4 channel relay for (C1-C2-P1_P2) and a system for control of this relays.
for example if we have 10 probe we need 10*4=40 relay. (I use 44 probe and use 44-4 channel relay module.)
ivconic or any one did you test EPE in real ground and whats were results?

What is the reason for the fluctuations and instability of the number #? The numbers fluctuate a lot.
We expect 1 to show, not a few different numbers. my device have problem? or it normal.? which number is true?

[MohsenTM]

Mr Carl-NC hi
Did you make the EPE john becker and test it yourself?
we need experience like yours?

[Carl-NC]

No, I have not.

[rwl518p]

Hi I am interested in your redesign of the EPE resistivity logger. I made this unit a couple of years ago and have used it quite successfully. I modded it as follows.
1. I removed the test switch.
2. I added a buzzer to the save switch.
3. On setting I start at column 1, row 1 instead of 0, 0.
4. I added the facility to auto increment the readings, on save, on the odd columns, and to decrement the columns on the even ones. It's easier that way to know where you are.


In the discussions I have noted the talk about auto saving on inserting the probes. I do quite a lot of geophysics work using a Frobisher meter. Prior to starting the survey we would have the probes in the ground at the first position. The display would show 'Select enter to start grid'. On doing this a reading would be taken. On lifting the probes out of the ground the display would read 'Insert probes at column 1 row 2' On doing this, and after a delay of about 20 seconds, a reading will be taken, and so on. At the end of the row , if set at 20 x 20 say, the unit would double beep and display 'End of row' On lifting the probes it would ask you to insert the probes at column 2 row 20 and so on down to column 2 row 1. At the end of the grid (400 readings) the unit beeps and displays 'End of row, end of grid. Remove the probes from the ground and the collected data would be written to the SD card and the unit would then shut down automatically. The unit will occasionally display 'High resistance' That reading can then be retaken.

[antonioknight]

Please can someone what he did and did get 0B 0A indication instead of 0B MAX If there is someone that had in the past same problem that i have showing max istead of 0A please tell me what u did and solve that problem .

[antonioknight]

If someone face the same problem please tell me how he solve that problem

[antonioknight]

Thanks for the replies .

[ricin48]

https://www.tekdagelektronik.com/uru...r-dizgili-pcb/

It is the original schematic. PCB design belongs to me.

[antonioknight]

https://www.tekdagelektronik.com/uru...r-dizgili-pcb/

It is the original schematic. PCB design belongs to me.

Does your readings on A is 0A and Max And if yes what did u do for that ?

[ricin48]

Does your readings on A is 0A and Max And if yes what did u do for that ?

I don't quite understand what you mean.

[antonioknight]

Can Someone please answer who had same problem with this device say what to do in order to correct it and i am talking for the reading that is max instead of 0A

[antonioknight]

Non not a single answer to max instead of 0A indication there are people here who had the same problem in the past i saw it in posts and i did not get a single answer . My GOD is it so dificult someone to answer ???

[antonioknight]

For those who are going to build this ERM logger in the future they and will face the same problem that i face on the display getting Max indication instead of getting the right one which is 0A you will have to perform the next modifications in order to fix it .

1. Cut the track between R16 And pin7 of IC4 (as it is mentioned in the part 2 on the epe magazine ) i am showing with an arrow in the picture .

2. Connect the now-open end of R16 to the pole of Switch S2
(in the picture i have place a red dot from where you are going to solder the wire )

3. After you do that and track is cutted R16 and S2 pole connected Turn on the erm press first and hold S6 (mode) and then while you are pressing and holding S6(mode) Press and hold also S8(Save) and the message (Ref saved will appear)
as you hold and press those two buttons release first S8 and then S6 .Then the value from Max will go to 0A .

Quote make sure the wires of the output are separeta and are not very very close .