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Load Cell Offset

Ujjwal Lamichhane
Prodigy 10 points
Other Parts Discussed in Thread: INA129

Hello everyone,

I am using a INA 129 instrumentation amplifier to amplify dc signals from my LSP2 -2kg load cell. Here's the link.

http://www.transducertechniques.com/lsp-load-cell.aspx

This load cell has fluctuating offset. I am trying to trim the offset. When I started reading the offset, it was giving me -40mV and now its giving me 14-15mV positive offset. I need to trim the offset from load cell on my output. What should be my range of the voltage (right now I am thinking of +180mV to -180mV, just keep me on the safe side) of the ends of the potentiometer to remove offset ?

Any help, recommendations would be greatly appreciated.

Ujjwal

  • 0
    Guru 21975 points

    Ujjwal,

    Assuming that this behavior comes from the load cell, it difficult for us to determine what range is required.

    It would probably be wise to do some basic checks to verify the source of the instability. Connect the two inputs to the INA129 together (shorting the differential output of the load cell). Is the output now stable. If so, the amplifier circuitry is okay.

    Check connections to the load cell. Do you have a clean, solid connection to the excitation voltage and ground? Is the load cell attached to some mechanical system that could be unstable?

    Regards, Bruce

  • 0
    Prodigy 100 points

    Hi, Ujjwal.

    May be any near placed TV / radio transmitter?

    Check it.

    Regards!