What I must buy in order to measure mAh please



  • Hi there all,
    I make a test for a develop node and I just misure (a normal cinese tester)
    how much mAh consume.
    But when it will go in sleep I always take 0 mAh.
    If I move the tester to uAh is not ok when it wake up.

    So can anyone tell me what I must buy (maybe all ready on Amazon)
    in order to misure mAh please from about 15 Mah to some uAh please ?

    Thanks in advance
    Denis


  • Hero Member

    @DenisJ I built one of these some years ago and I'm still happy with

    https://www.openhardware.io/view/380/Micro-nano-ampere-meter-double

    It covers the range you mentioned at least. Hope it helps.



  • Thanks a lot... maybe I'll make one of this,
    but now I need to buy one as soon is possible ๐Ÿ™‚

    Denis



  • @DenisJ in typical sleep mode it could take 6 or 7 days to register 1mAh. Maybe why you always see '0' in that range? What is the longest time period you left it to measure for?



  • Usually I let it now 30 seconds in order to see the value in sleep mode.
    Today I just buy this one... I'll try it tomorrow.

    Thanks a lot
    Denis



  • I just retry with the newone and it give me about 9,1 uAmp ๐Ÿ™‚
    f5f6aeb3-a73d-4b79-ae44-3ffd6f33d22b-image.png
    Thanks all


  • Hardware Contributor

    Having a common plug for mA and ยตA range as the one you bought is the minimum, else you have to unplug/re-plug before the nodes gets out of sleep and obviously this will make measurement impossible. Unfortunately a lot of cheap multimeters have a separate plug and are useless in this scenario.

    Best is to find a multimeter with more digits and that can use them all in the ยตA range. With 20 000 count you can go up to 20mA which is usually enough to measure power consumption for both sleeping and running node.



  • @Nca78 said in What I must buy in order to misure mAh please:

    you have to unplug/re-plug before the nodes gets out of sleep and obviously this will make measurement impossible.

    I use the multimeters in this mode:
    -first I musure the work mA in the work session, with the switch on mA... this give me about 19 mA
    -then I put the switch on uA but I also put a direct wire that is in paralel to the multimeters in order to have suficient current
    ...when the Arduino go in sleep mode, I take out the direct wire and the remained wire of multimeter will misure the uA ๐Ÿ™‚

    Thanks a lot for the answer.
    Denis


  • Hardware Contributor

    @DenisJ you can just wait for the arduino to be in sleep mode to switch from mA to uA.



  • Yes now I know ๐Ÿ™‚
    But the tester that I had before this one,
    when it was switching from mA to uA, it was reseting the board.

    Now all is greate ๐Ÿ™‚
    Thanks a lot


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