[volt-nuts] Solartron 7071 vs 7081 (David C. Partridge) 6. Re: Solartron 7071 vs 7081 (David Partridge)

Bill Ezell wje at quackers.net
Thu Apr 5 02:12:26 UTC 2012

It's truly amazing that people can still be found that worked on some of this wonderful equipment. I knew the Zener was selected, wasn't sure about the rest. BTW, I hope everyone is suitably impressed that Solartron was able to get the accuracy and stability they achieved using only an easily-obtainable Zener, some clever biasing, and some simple temperature compensation. So much incredible equipment came out of Britain in those days, like some of the Datron meters and the still-phenomenal Datron voltage standards.

>Here's an extract from an email from one of the guys who worked at Solartron for a long time and>is still there now that it is Ametek:

> Incidentally did you know that the 7081 and 7071 are essentially the same instrument?
> The reference zener diodes were soaked for several weeks in an oven which temperature
> cycled them and each diode was checked regularly for stability. The very best ones were
> selected to go in the tighter specified 7081. The not so good ones went in the 7071.
Bill Ezell
They said 'Windows or better'
so I used Linux.

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