[time-nuts] "Clock Calibrator" project

[Peter McCollum]

Update: The "freq difference" with a 1-second gate time is not so useful
when the difference is less than a couple of Hz.
So, I added a simplistic graphic to the display, like an O-scope, updated 6
times per second. Also added a calculation of the Period (in seconds).

Pete


On Sat, Jun 20, 2020 at 10:15 PM Peter McCollum <saipan1959 at gmail.com>
wrote:

> Hi All,
> Just joined. Not sure if I qualify as a "Nut", but I'm working on it :-) .
> Today I mostly finished the following project:
>
> A friend gave me the idea of wanting something to adjust the oscillator on
> a Nixie clock, but not owning a decent counter.
> I had a CW12-TIM module that I'd never used.
> The idea was to set the CW12 to match the external oscillator's freq, then
> measure/display the difference between the 2 freqs, so that the oscillator
> could be tweaked.
> The "Difference" display is in Hz, counted by the MCU with a 1-second gate.
> The MCU (on the red board) is a T.I. MSP430FR2355.
> Comments/questions welcome!
>
> FYI, Time/freq-related stuff I have:
> HP101A, HP215A, HP500B, HP521C, HP522B, FR-38B, HP5245L, HP5512A, HP5316A,
> HP5345A, HP115AR, HP59309A, and a bunch of other test gear (mostly HP, some
> Tek and others).
>
> Pete
>