[time-nuts] HP5061B Versus HP5071 Cesium Line Frequencies

Bob kb8tq kb8tq at n1k.org
Fri Jun 2 15:07:56 EDT 2017


If you are going to use an oven, it’s better to run it at the turn temperature of 
the crystal. That would put you above 50C for an AT and a bit higher still for an SC.


> On Jun 2, 2017, at 2:09 PM, Donald E. Pauly <trojancowboy at gmail.com> wrote:
> https://www.febo.com/pipermail/time-nuts/2017-May/105566.html
> If we build this circuit it would be a bench model not designed to be
> inside a hot chassis.  It would be able to lock ± 5° C of 25° C.  My
> idea of an oven is to keep the crystal and oscillator at 25° C ±0.001
> °C with 60 second warm up/cool down time.
> πθ°μΩω±√·Γλ
> ---------- Forwarded message ----------
> From: Bob kb8tq <kb8tq at n1k.org>
> Date: Fri, Jun 2, 2017 at 5:57 AM
> Subject: Re: [time-nuts] HP5061B Versus HP5071 Cesium Line Frequencies
> To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
> Hi
> I would suggest you check a few real crystals over the 20 to 40C range ….
> With all the “stuff” in a 5061, it will change (rise) at least 10C
> after turn on.
> Bob
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