Products > Test Equipment
Old Fluke Multimeters
eugenenine:
Mine seemed to be a little different from that thread. Mine would only power the meter from battery even with good cells. The charge circuit went to the battery packs when the meter was off and when on the battery was connected to the meter. So after a few hours of use the batteries would get drained and you had to switch off to charge. Reading the other thread it seems that theirs would still charge the batteries while the meter was in use.
I just pulled out their regulator and batteries and soldered in my own 5v regulator going into the switch where the batteries used to be connected.
tautech:
A reply in another thread by drtaylor that should be linked to from this thread:
https://www.eevblog.com/forum/testgear/fluke-8060a-dual-fuses-bad-design/
drtaylor:
--- Quote from: billfernandez on December 24, 2015, 06:47:57 am ---I used to work at Siliconix (a now defunct semiconductor manufacturer) and when there I learned that we were making a custom chip (I think a hybrid analog/digital A/D converter) for Fluke meters. I had thought they were for the 8060, but I guess not. DRTaylor, do you have any recollection of what I'm talking about?
--- End quote ---
Bill, I believe that Siliconix supplied a custom chip used in the 8050 A/D. It had a lot of low leakage analog switches and was used in conjunction with external Op Amps. If I come across any proof of this I'll post it. But this is just a vague memory. I do know that we used a lot of discrete Siliconix J-Fets for low leakage analog switches. Siliconix was another victim of the Vishay plan to rule the world (of discretes)!
billfernandez:
--- Quote from: drtaylor on December 30, 2015, 07:16:37 am ---Bill, I believe that Siliconix supplied a custom chip used in the 8050 A/D. It had a lot of low leakage analog switches and was used in conjunction with external Op Amps. If I come across any proof of this I'll post it. But this is just a vague memory. I do know that we used a lot of discrete Siliconix J-Fets for low leakage analog switches. Siliconix was another victim of the Vishay plan to rule the world (of discretes)!
--- End quote ---
That sounds vaguely familiar. It's kind of nostalgic thinking back to those days :).
eugenenine:
--- Quote from: IconicPCB on December 26, 2015, 07:01:10 am ---Is there a specification on the battery option toroidal transformer?
I would like to implement it.
--- End quote ---
I wouldn't bother duplicating Fluke's design, they used a simple trickle charger which is why the batteries die after a few years. Design a proper charger if your going to do it.
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