[time-nuts] HP 100D FS [WAS: HP 105D FS]

[Bob kb8tq]

HI

If you take a look at the schematic of the oscillator circuit shown in the HP
Journal article, it is the standard circuit that is used in just about every 
microprocessor clock and clock oscillator made (except for the vacuum tube …)
No, it’s not the earliest example, but it is pretty early by my standards ( = it’s older 
than I am :) 

Bob


> On Apr 9, 2017, at 3:04 PM, Charles Steinmetz <csteinmetz at yandex.com> wrote:
> 
> Perry wrote:
> 
>> The HP oscillator is a 100D Low Frequency Standard..
>> Sorry for the brain fart.
> 
> For a bit more information on the 100D (and 100C), see the October, 1949 Hewlett Packard Journal:
> 
> <http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1949-10.pdf>
> 
> Note the accuracy and stability specs:
> 
> ACCURACY:  Average stability is within approximately two parts per million per week.
> 
> STABILITY:  Within one part per million over short time intervals, such as required to make a measurement.
> 
> The price in 1949 was $600 f.o.b. Palo Alto.
> 
> Best regards,
> 
> Charles
> 
> 
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