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Current reading difference

Question asked by harshala on Jun 6, 2014
Latest reply on Jul 2, 2014 by MattC

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Hi,

I am trying to evaluate 2 power supply. The current measure on both the supplies are consistent but show a difference of 10-15 mA. The current I am measuring is average current around 400-800 mA. Any idea what could be the reason? Even if the power supply cable length is different, the sense lines should adjust the voltage accordingly, right?

Thanks,
Harshal

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MattC Jun 18, 2014 4:04 PM
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Hello,

What are the model numbers of the different power supplies? Different supplies can have much different current measurement accuracy specs. Please let us know and we will see what is going on.

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- harshala @ MattC on Jun 25, 2014 3:54 PM
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  Hi,
  
  My obersvation is if I use 66332A supply and then replace it with N6762A supply keeping the power supply cable length the same, I see a difference of 15-20 mA in 0.3 to 1 Amp range. However, when i change the cable length and the power supply is still kept the same, say N6762A which was measuring 300mA is now measuring 315 mA current.
  
  So, I am not sure if it is power supply which is causing it or is the cables which i am using. My understanding is since it has force and sense lines, it will adjust any voltage drop and provide correct Voltage at the load. Increase in cable length will increase resistance which will have Voltage drop and so current remains constant.
  
  Please correct me if i am wrong and also if you have any suggestions on verifying the integrity of force and sense lines.
  
  Thanks,
  Harshal
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  - MattC @ harshala on Jul 2, 2014 12:30 PM
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    What is the load when you are doing this?
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