[time-nuts] 5MHz x 10MHz

Tim Shoppa tshoppa at gmail.com
Fri Aug 2 18:05:24 UTC 2013


Many important lab references over past 50, 60 years are named and
characterized at http://www.ieee-uffc.org/main/history-norton.asp

2.5MHz and 5 MHz seem common as far back as the 1950's and 1960's (and I've
used some of them! e.g. Sulzer) and continue through today.

Late 60's and early 70's HP benchtop counters used a 1 MHz crystal. e.g. HP
5321B.

By the mid-70's HP Frequency counters were using 10MHz references. e.g. Hp
5383A (which for many of us was the defacto bench counter forever) most
often in a TCXO can.

Tim.


On Fri, Aug 2, 2013 at 12:31 PM, Euclides Chuma <euclides at w2c.com.br> wrote:

> Hi,
>
> Why any equipments use 5 MHz and others use 10 MHz reference standard?
>
> Thanks
>
> Euclides Chuma
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