Electronics > Beginners

DMM Batteries?

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Russ:
My Fluke 179 arrived today. I was wondering why they chose to go with a single 9v battery, when many others use AA or AAA cells? What are the advantages or disadvantages of the 9 volt cell?

Thanks
Russ

rawrs:
Sorry for my answer to contain solely a video, but, I actually remember a video on this. I haven't watched it yet, but it has shown up in my suggestions. I'm about to watch it right now, myself. Hope this helps!



TL;DW, battery life. That video leads me to believe that AA's are more energy dense than 9v batteries, as 9v batteries are basically just 6 AAAA batteries jammed into a case and wired together. By using four AA's in the 121GW, for example, you can get a lot more battery life.

Ian.M:
OTOH due to their construction, 9V PP3 alkaline batteries very rarely leak, and if they do its unusual for the electrolyte to reach the tops of the terminals and damage spring contact battery holders, or if a PP3 battery clip is used its much easier to replace the clip, so 9V PP3 batteries may still have an advantage if you value high reliability and long storage shelf life above operating hours and battery cost.

Russ:
Thanks. My experience with Coppertop AA and AAA batteries, is that they usually leak. They are know for this. I refuse to use Coppertops or Ray-O-Vacs.

Thanks

Synthtech:
I agree, those things leak like there’s no tomorrow, I won’t let them near any of my equipment.

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