Topic | Periodic offset shift on dc curent logging

Home Forums Mooshimeter Support Periodic offset shift on dc curent logging

This topic contains 1 reply, has 2 voices, and was last updated by  James 1 month, 2 weeks ago.

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  • #15621 Reply

    Nicolai Frost

    Hi I’m having problems with logging relative low currents for extended periodes.
    I’m measuring currents in the range of 0.0038 Amps over a periode of 1-3 days with logging every 10s, test i ran in december 21. had no problem but here in January mooshimeter is inducing a strange current offset in the data roughly every 12-13 hours.

    I am also using the voltage channel to measure a voltage at the same time but here I dont seen any periodic spike. So I can conclude that the periodic DC amps offset does not come from any outside influences such as fluctuations in the powersurply or the temperature.

    My thinking is that it is due to some problem in the latest firmware.

  • #15701 Reply

    James
    Keymaster

    Hi Nicolai,

    Sorry I didn’t get to this quickly. Just trying to understand the issue: Is it a single erroneous reading every 12 hours? Or does all the data shift?

    ie. does it go 1, 1, 1, 1, 2, 1, 1, 1
    or 1, 1, 1, 1, 2, 2, 2, 2

    If it’s cyclical, I would bet it’s a slight change in the circuit gain due to temperature. If the voltage channel is close to zero, you would not notice a change in gain on that channel.

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