[time-nuts] CSAC Project(was CSAC purchase)
kb8tq at n1k.org
Sat Jan 27 11:10:28 EST 2018
“Included software” on the CSAC is a pretty short list …. There
is not much past the “stuff” to set it on frequency and read out
a few alarms.
One thing that gets into a lot of these projects:
We are Time Nuts and spec things in terms of time. This error
over that period is some specific number. Maybe we look at
temperature rather than sit it on the shelf for a year. The number
is still a time error.
Pretty much everybody making devices spec’s them (and may think
of them) as frequency generating gizmos. They all spec a frequency
error over some condition (like a period of time). Unfortunately time
error and frequency error aren’t the same thing.
This also gets into things like control loops. Generally the input is a
time error and the output is a frequency control. Same basic gotcha
the input isn’t the same as the output. Fortunately they are related
very closely to each other.
> On Jan 27, 2018, at 10:32 AM, Ronald Held <ronaldheld at gmail.com> wrote:
> That makes sense, since you need some display short of the
> included software. Might end up giany cell phone size?
> Beyond my abilities, since I am a software guy, not hardware.
> One way or the other you will need some “smarts” to do aging compensation.
> That implies adding a CPU of some sort to the “system” you are building. There
> is no built in subsystem on the CSAC that will do any of this for you. You also
> need some sort of display for your “wrist watch”. Having the CPU handle that
> at the same time makes a lot of sense.
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