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9V rechargeable ok for DMM at 7.2V?

Discussion in 'General Electronics Discussion' started by NuLED, Jul 18, 2013.

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  1. NuLED

    NuLED

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    Jan 7, 2012
    As I understand it, 9V NiHM are providing 7.2 V, is this good enough for DMMs?

    What is your experience?

    Any recommended recharger, NiHM?

    Thanks.
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,496
    2,837
    Jan 21, 2010
    At least one of my multimeters starts providing me with erroneous readings at around that battery voltage.

    Connect the battery and check that all the readings are in spec.

    If your meter has a battery warning and its not activated, then you may be OK.
     
  3. NuLED

    NuLED

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    Jan 7, 2012
    I don't have the rechargeables yet. Just was wondering if I should buy them. Maybe not...
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,496
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    Jan 21, 2010
    It's hard to say.

    You could power your meter from a bench power supply at 7V and see how they behave. Be careful because your probes are no longer isolated from ground!)
     
  5. BobK

    BobK

    7,682
    1,688
    Jan 5, 2010
    An alkaline 9V lasts me for years in two multimeters I have. An NiMh would self discharge in less time than that, so not that useful anyway.

    Bob
     
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