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From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: Practical resistor accuracy distribution
Date: Sun, 28 Apr 2024 14:00:01 +1000
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On 28/04/2024 7:53 am, John Larkin wrote:
> On Sat, 27 Apr 2024 17:41:10 -0400, Joe Gwinn <joegwinn@comcast.net>wrote
>> On Sat, 27 Apr 2024 14:24:43 -0700, John Larkin <jjSNIPlarkin@highNONOlandtechnology.com> wrote:
>>> On Sat, 27 Apr 2024 16:47:29 -0400, Joe Gwinn <joegwinn@comcast.net> wrote:
>>>> On Fri, 26 Apr 2024 19:38:07 -0700, John Larkin <jjSNIPlarkin@highNONOlandtechnology.com> wrote:
>>>>> On Fri, 26 Apr 2024 20:16:48 -0400, Joe Gwinn <joegwinn@comcast.net> wrote:
>>>>>> On Sat, 27 Apr 2024 00:54:41 +0200, Klaus Vestergaard Kragelund <klauskvik@hotmail.com> wrote:

> One could cal out tempcos, but test time would be outrageous.
> 
> We are bidding on one unit that might need that. Yuk. The alternative
> is to, basically, ovenize the PCB.

Top-end crystal oscillators have been relying on that for decades now.

Peltier junctions let you stabilise the board temperature close to room 
temperature, which can reduce long term drift.

-- 
Bill Sloman, Sydney