Measuring external subsystem with shunt


#1

Hello,
Otii is great help for us in the office. I have recently tried to sense how much current is sourced though the battery so I have connected a 0R1 in series to to the battery positive lead and connected to DUT. Accorsingly connected ADC+ before and ADC- after the shunt. I have also connected the AGND to the negative battery lead.

What im getting seems like a correct graph, but incorrect scale and im getting both positive and negative values for current which seems strange. Voltage seems allright.

Any ideas?

Marcel


#2

Hi Marcel,

This looks strange.
If you only open the ADC current channel and measure current, without anything connected, do you get a large offset?

Best regards,
Björn


#3

Without anything connected the current offset is in average -0.5uA and V offsetmaxes at 6mV.


#4

Hi,

Could you share a picture, or block diagram, of your complete setup?
If you do not want to share it here, then create a case in our case system.

Best regards,
Björn