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Old Fluke Multimeters

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drtaylor:
If memory serves, I believe the 2 AA board was used instead of a DC-DC due to noise generation and as a way to float the current source. DC-DC converters back then were low frequency and noisy and it was difficult to keep noise out of the sensitive circuits. As techniques and circuits improved, these problems went away (at least if you knew what you were doing). Now days there are far better ways to make floating current sources. But I could be totally wrong about this. I think I have a schematic somewhere and I will try to remember or determine the reasons for that somewhat lame circuit. I'm sure the engineer who designed it (wasn't me) thought it was the bees knees of ohms conversion circuits.

Update on trove of 8060s and other meters. I have had a contract job that should be finished soon. Then my next project is to restore the 8060s. On initial examination, about half of them are somewhat functional. Physically they are in good shape, only one having a kind of ugly case. I have caps to order, but hopefully I will get these going and finished by the end of August.

WastelandTek:
what

a

thread!

wow, just, wow

whelp, back to page 5, which is where I made it to before I could no longer contain myself

switcher:
Thankyou for your reply, Mr. T. much appreciated; I felt sure there was a valid reason, and ofcourse... :-+

And I'd sell my soul to the devil, for the chance of one of your 8060s pretty please :)


--- Quote from: drtaylor on July 16, 2017, 05:51:49 am ---If memory serves, I believe the 2 AA board was used instead of a DC-DC due to noise generation and as a way to float the current source. DC-DC converters back then were low frequency and noisy and it was difficult to keep noise out of the sensitive circuits. As techniques and circuits improved, these problems went away (at least if you knew what you were doing). Now days there are far better ways to make floating current sources. But I could be totally wrong about this. I think I have a schematic somewhere and I will try to remember or determine the reasons for that somewhat lame circuit. I'm sure the engineer who designed it (wasn't me) thought it was the bees knees of ohms conversion circuits.

Update on trove of 8060s and other meters. I have had a contract job that should be finished soon. Then my next project is to restore the 8060s. On initial examination, about half of them are somewhat functional. Physically they are in good shape, only one having a kind of ugly case. I have caps to order, but hopefully I will get these going and finished by the end of August.

--- End quote ---

Fungus:

--- Quote from: switcher on July 16, 2017, 01:08:35 pm ---And I'd sell my soul to the devil, for the chance of one of your 8060s pretty please :)

--- End quote ---

Join the queue...  :P

Neomys Sapiens:
So you designed one world-class instrument - congratulations!
Let me tell you the story of MY 8060A! I was about 15 at that time and spent my summer holidays working at a small engineering company which did some pretty advenced stuff in automation and drive controls. I did intend to spend my earnings on a really good multimeter. There was a limited choice, those that I remember were the Keithley 139 and the analogue Unigor6e. I asked my boss, who was quite a grumpy guy, for his opinion. He dismissed the K130 outright, adding that the RMS function is not woth it and that I should keep away from the digital crap, where one doesn't see anything.
It was the year the 8060A came out in Germany. It was announced with a uncustomally flashy ad, showing a guy on a motor scooter loaded with all the instruments that the 8060A was supposed to replace. I showed the data sheet to my boss too. He grumbled to himself for an extended time while reading and then he stated that he doesn't believe it, but if it did what was advertised, then it would be probably the instrument to get.
And so I did. I ordered a 8060A at a whopping 14??.-DM, being so early in the european line, that I actually had to wait for it. It served me well for 20something years and even after aquiring a Fluke87, it was my preferred multimeter for anything communications related work, until it became the victim of an extended fall.
Thanks for the work that was obviously put into that great meter!

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