![]() 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. 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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