Electronics > Projects, Designs, and Technical Stuff

Measuring clock quartz frequency accurately

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Axk:
Ordered what is claimed to be a 0.1ppm TCXO from Aliexpress.

https://www.aliexpress.com/item/Fast-Free-Ship-Optional-100kHz-200kHz-400kHz-500kHz-800kHz-32-768kHz-20kHz-0-1ppm-tcxo-high/32717118453.html

Will see if I compare the clocks's osicllator to this one on my scope and see the drift between the two.

jmaja:

--- Quote from: JBeale on April 11, 2019, 04:54:11 am ---I've noticed the same thing, every (digital) wristwatch I've ever had ran slightly fast, usually about 1/2 to 1/3 second per day. I believe people tend to think a slow watch is broken, but a watch going the same amount fast is still ok.

--- End quote ---

I would hate to have such an inaccurate watch. The worst digital watch I have had gained about one minute in half a year (before it needed adjustment for daylight saving time) and the best only a few seconds. The first one I got was in 1979 and the worst one was from the 90's.

Zero999:

--- Quote from: jmaja on April 12, 2019, 07:39:44 am ---
--- Quote from: JBeale on April 11, 2019, 04:54:11 am ---I've noticed the same thing, every (digital) wristwatch I've ever had ran slightly fast, usually about 1/2 to 1/3 second per day. I believe people tend to think a slow watch is broken, but a watch going the same amount fast is still ok.

--- End quote ---

I would hate to have such an inaccurate watch. The worst digital watch I have had gained about one minute in half a year (before it needed adjustment for daylight saving time) and the best only a few seconds. The first one I got was in 1979 and the worst one was from the 90's.

--- End quote ---
A minute over six months, is roughly a third of a second per day.

jmaja:

--- Quote from: Zero999 on April 12, 2019, 08:55:16 am ---
--- Quote from: jmaja on April 12, 2019, 07:39:44 am ---
--- Quote from: JBeale on April 11, 2019, 04:54:11 am ---I've noticed the same thing, every (digital) wristwatch I've ever had ran slightly fast, usually about 1/2 to 1/3 second per day. I believe people tend to think a slow watch is broken, but a watch going the same amount fast is still ok.

--- End quote ---

I would hate to have such an inaccurate watch. The worst digital watch I have had gained about one minute in half a year (before it needed adjustment for daylight saving time) and the best only a few seconds. The first one I got was in 1979 and the worst one was from the 90's.

--- End quote ---
A minute over six months, is roughly a third of a second per day.

--- End quote ---

Yes it is. I only have had one watch that inaccurate and I didn't like it due to it. My current one (Polar RCX5 heart rate monitor) may gain 10-20 s in half a year and I have had more accurate ones. It can be adjusted to daylight saving time without adjusting seconds. I still set it 2-3 times a year. Especially during summer it is nice to have it close to GPS time, since I do sail racing and starts are always at GPS time. The inaccurate one was also made by Polar.

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