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Voltage battery measure single-ended or differential reading


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6 replies to this topic

#1 ermips

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Posted 02 September 2013 - 04:27 AM

Hello,
Is Voltage battery measure single-ended or differential analog reading ?

Thanks



#2 LabJack Support

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Posted 03 September 2013 - 11:03 AM

For 1 battery, you would usually do single-ended where you connect the - to GND and the + to AINx.



#3 ermips

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Posted 03 September 2013 - 11:30 AM

ok, Thanks for your reply.

And if i have two batteries to check what is the good practise ?



#4 LabJack Support

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Posted 03 September 2013 - 04:20 PM

You have to consider ground location and common-mode voltage, among other things:

 

http://labjack.com/s...l-analog-inputs

 

What is the voltage of each battery?  Are they connected in series?  Which LabJack are you using?



#5 ermips

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Posted 04 September 2013 - 12:37 AM

Each batterys is  12 V and they 're independent of each other.
Labjack is U3 HV 



#6 LabJack Support

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Posted 04 September 2013 - 09:15 AM

If they are independent of each other, the best option is to connect the negatives of both batteries together and run a single wire from there to GND on the U3.  Then connect each positive to an AINx channel to make a single-ended measurement of each.  Note that you need to use the special range (which is -10 to +20 volts), so depending on software that means you need to set the negative channel to 32.



#7 ermips

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Posted 05 September 2013 - 01:16 AM

Thanks for your reply. I m going to use this setup.




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