I have one 8922 True RMS Voltmeter (with lots of design notes as this was my first extensive engineering project). This was pre 8060 and didn't have any of the premium Audio features. As far as other Fluke oldies I have: D804 (a variant of the 8024) but its LCD is toast and the case is cracked. An inordinate amount of time was spent on optimizing the PCB and plastic shield to get that 100kHz bandwidth. You can see in the original schematic (scan coming tomorrow), nothing had been done about that yet. It caused noise on the AC readings as well as false counts on the frequency counter.
I had forgotten how much that 7660 circuit gave me grief. I couldn't find my D size hand drawn schematic. I do have a copy of the original, not quite the production, schematic. Also about 30 copies of the "quick start" guide. I do have a lot of literature: Three 8060 user guides, one IBM user guide. One of the 8060s is a blue IBM style, and one has a regular color case but with an IBM label. The others haven't been fired up in years. Only the 8060A that I use at home for sure works. I have three 8060A's and 2 8062As all in good physical shape. I have no parts for anyone, and I'm truly sorry. My wife did indeed toss out my 8060A parts box. I may be willing to part with an 8060 or two. I mostly have parts left over from the development of the 8060. To all: I'll check this weekend for what parts I have that would be useful for restorations. It was the competitive Beckman line of DMMs that made Fluke switch to a rotary. Fluke stuck to their guns with the side pushbuttons for many years, the 8060 being the final DMM in that form factor.
To Modemhead, As far as I know, the 8020 was the first with that approach. At one time I had a box of parts, enough to build several 8060s and I had IBM color cases. To Napalm2002, This weekend I'll see if it survived my wife's purges. But the SRAM used is probably no longer available. I do know that cal memory tended to be battery backed CMOS SRAM and I wouldn't think it would be complicated. I was in the handheld BU most of my 8 years at Fluke. To Chris (mamalala), I'm sorry, I had nothing to do with the 8502, actually a different business unit. Also I had designed that prototype Power Supply I mentioned in an earlier post into that enclosure too and had such a huge heat sink on the back so there was barely room for the AC jack. Anyway, the industrial designer didn't provide for any ventilation, so you had to hang a heat sink out the back just to cool things. An industrial designer at Fluke came up with an interlocking design and we were told that all bench instruments had to go into them. One interesting thing about that development was the enclosure.
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That was actually the last non-microcontroled instrument I worked on as I went on the 8060 after the 8920 series came out. One thing that is interesting is the dB conversion was handled by a custom chip, not a microcontroller. It had an interesting anti-log circuit on the DC side of the sensor to try to improve the settling time. We did funny things like sticking two leads in the same hole to reduce lead inductance. It strikes me as kind of funny now because you can buy off the shelf op amps much faster, but at the time, the only way to get the bandwidth was with discrete circuits.
It was really an impressive piece of engineering. The Senior Engineer that designed that discrete op amp taught me so much. It was discrete opamps driving a Fluke developed thermal sensor that was a great TRMS converter capable of large crest factor readings. I designed some of the options and ran most of the design testing.
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