Electronics > Metrology

I have opportunity to ask Q to Mr John Pickering (Datron/Wavetek/Metron Designs)

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TiN:
HP and Fluke had patent for ACAL concept. 1271/1281/4950 have somewhat related self-cal procedures build-in but they still built on external artifacts for proper traceability.

Micke:
I think it would be interesting if he could give some insight how the "big players" do burn-in of LM399/LTZ1000 devices, for how long, temperature cycling etc. What are the criterias for reject/keep? Do they order already "cherry-picked" devices  from manufacturer (probably they do, how much "better" are these devices than the rest we other can buy?) and then continue burn-in, testing/screening and binning for different grades of equipment? For example I am thinking of LM399 based FLUKE 8845A/8846A DMM where 8845A has 1 year 10VDC accuracy specification of 35ppm, but 8846A has 24ppm. Some of this can be contributed to the fact 8846A has better resistor networks, but it might well be that they keep the best LM399´s for 8846A.

alanambrose:
I wonder whether you can drop in a thought about whether he might consider doing a little youtube series - pretty much historical-stream-of-consciousness and maybe the odd general open question as a prompt. It would be fascinating and also a legacy.

Alan

LaserEng:
In the early 90's I was supervisor of a small calibration facility in South Wales and occasionally the Sales Rep for Datron or Wavetek, I think it was Wavetek by then as the gear he was demo'ing had white front panels by then.

Anyway, the sales rep liked to call just before lunch so the company I worked the boss was famous for liking a boozy lunch, at one of these lunches we where discussing what new stuff was being worked on and he mentioned a calibrator or DMM, these are hazy memories, that would do more than 8.5 digits and I recall him saying that it was destined for NMI's only and used many (seem to recall over 20) LTZ1000 paralleled and all inside their own oven so double ovened if you like.

Would love to know if there was any truth in this, being young and newly out of college, I wasn't sure but with hindsight and experience I tend to think this fella was talking out of his backside.

Other than that any technical information about the Datron stuff is most welcomed, would love to see full copies of ALL the service manuals for the Datron gear made available as some of them are still hard/impossible to find.

MadTux:
Inside workings of all the CLAxxx inside D1271/1281, so people can fix them.
#1 reason why I sold my D1271.

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