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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