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Products => Test Equipment => Topic started by: 001 on November 19, 2018, 08:12:54 am

Title: FLUKE 8012 ChaRger circuit and battery chaNge
Post by: 001 on November 19, 2018, 08:12:54 am

Hi!

I see what NiCd battery inside FLUKE 8012 got charge everytime when it was plugged into outlet
It charges via simple current limiter  :-//
See chematics here C:/Users/vic/fluke%208010a%208012a/Fluke-8010%208012A_Instruction_Manual.pdf

There are not NiCd around now
What is the best way to mod Fluke 8012 to NiMH batteries? Is it some AA?

Title: Re: FLUKE 8012 ChaRger circuit and battery chaNge
Post by: bd139 on November 19, 2018, 09:55:06 am

I wouldn't bother myself. Stick NiCd in it or make it mains only. NiMh wont charge safely with that circuit.

I actually just modded one of these a week or so ago to be mains only: https://www.eevblog.com/forum/testgear/fluke-8010a-mains-only-conversion-and-display-replacement/ (https://www.eevblog.com/forum/testgear/fluke-8010a-mains-only-conversion-and-display-replacement/)

I changed the LM317 to be a voltage source rather than current source by breaking a track and adding a couple of resistors.

If you haven't done it already, change all the electrolytic capacitors!

Title: Re: FLUKE 8012 ChaRger circuit and battery chaNge
Post by: 001 on November 19, 2018, 10:09:09 am

Quote from: bd139 on November 19, 2018, 09:55:06 am

I actually just modded one of these a week or so ago to be mains only

Awesome work  :-+ But I need to battery mode

Quote from: bd139 on November 19, 2018, 09:55:06 am

Stick NiCd in it or make it mains only. NiMh wont charge safely with that circuit.

No any NiCd around  :-// So how to replace it smart? I.e. how to add NiMH charger to 8012 without any EMС or metrological problems?