OhmPi V 2.00 (64 electrodes and 12V)¶
Note
In this version, we have developed two new board types that allow the assembly of Ohmpi v2.00, a measurement board and a multiplexer board. This new version is made up of:
A measurement board for four-point measurement
4 multiplexer cards
A box
The philosophy of Ohmpi¶
The philosophy of Ohmpi V2.00 is to offer a new DIY multielectrode resistivity meter. It is a resistivity meter with 64 electrodes , which can be upgraded to 128 electrodes. It is limited to low-current injection,but suitable for small laboratory experiments and small field time-lapse monitoring. Ohmpi, is developed by a team that seeks to share all its experience and wishes to improve and offer a more and more robust tool to the community.Ohmpi V2.00 is a completely different version from the previous one. We will stop the development on the previous version, to dedicate our efforts on this new version.
Technical data¶
Parameter |
Specifications V1 |
Units |
Specifications v2 |
Units |
---|---|---|---|---|
Electrodes |
32 |
64 to 128 |
||
Operating temperature |
-0 to 50 |
°c |
-25 to 50 |
°c |
Power consumption of CPU and control system |
18.5 |
W |
18.5 |
W |
Voltage injection |
12 |
V |
12 |
V |
Battery |
9 |
V |
12 |
V |
Current |
0 to 40 |
mA |
0 to 40 |
mA |
Min pulse duration |
150 |
mS |
150 |
mS |
Input impedance |
80 |
Mohm |
80 |
Mohm |
Data storage |
micro SD card |
micro SD card |
||
Resolution |
O.O1 |
ohm |
O.O1 |
ohm |