# Help request for a switching design

Discussion in 'Power Electronics' started by kaimdaim, Jan 26, 2020.

1. ### kaimdaim

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0
Jan 26, 2020
I have 9 driven electrodes. I want to read (I) and (V) measurements via these probes. Here is the pairing configuration(Current is measured via the first couple ,and the voltage is measured via the second couple):
1-2+3-4
1-2+4-5
1-2+5-6
1-2+6-7
1-2+7-8
1-2+8-9
2-3+4-5
2-3+5-6
2-3+6-7
2-3+7-8
2-3+8-9
3-4+5-6
3-4+6-7
3-4+7-8
3-4+8-9
4-5+6-7
4-5+7-8
4-5+8-9
5-6+7-8
5-6+8-9
6-7+8-9
As seen,the total number of pairings is 21.
So,what kind of switching configuration would be the best,in order to save time utmost for measurement process?I would like to get ideas to achieve an optimum design.

2. ### Harald KappModeratorModerator

10,346
2,249
Nov 17, 2011
What about a schematic diagram? A picture is worth a thousand words.

3. ### kaimdaim

7
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Jan 26, 2020
I am not good at drawing diagrams,as I am just amateurly and indirectly interested in electronics field. I made my measurement design just depending on the resistivity measuring technique. I can just add a photo of the instrument which I made and now I wanted to develop it in order to decrease the measurement time by a switching design. Another detail is that during the measurement the electrodes are dipolar.For example,in 1-2+3-4 step,3 is negative pole and 4 is the positive pole,and then in the following step 1-2+4-5 the electrode 4 is the negative pole. That's why switching configuration has become a problem for me.

7
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Jan 26, 2020

5. ### kaimdaim

7
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Jan 26, 2020
I manually plug the jacks of the paired electrodes according to the order,and get the measurements via 2 multimeters; one of them for V,and the other for I.

6. ### WHONOES

938
239
May 20, 2017
What values of Voltage and Current are you expecting to measure.

7. ### kaimdaim

7
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Jan 26, 2020
Values are minivolts and miniamperes

8. ### kaimdaim

7
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Jan 26, 2020
The first pair of electrodes is to measure the I in miniamperes,and the lateral pair is to measure the values in minivolts.

9. ### WHONOES

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239
May 20, 2017
I take it you mean millivolts (mV) and milliamps (mA).
A schematic of some description would be of enormous help to us so that we can help you otherwise we are just making stabs in the dark.
The process of putting down on paper in the form of a sketch what you are trying to do can often suggest a way forward.

7
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Jan 26, 2020

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Oct 5, 2014
12. ### WHONOES

938
239
May 20, 2017
Not a lot different to your original post. Try drawing more detail on how you want to switch. As presented, we have no idea which is to be a current measurement and which is to be a voltage. Also,do you want to use a mechanical switch, rotary or otherwise or, do it all automatically?