Bad time keeping on the P-89089 Kit

Kits Timers and Clocks
1

Greetings. I just built the clock\thermostat an it works great on both, with the exception of the clock keeping real bad time. Is there any way to ajust the ability of the clock to keep more accurate time? I have had the clock running for maybe an hour and it’s like 6 minuets slow. I hope you have some suggestions.
Thanks.
Gary Scoville

P.S. It was allot of fun building it and having it actually work right!

2

Are you running the clock from an AC supply?
If not, then it is normal that it does not keep time correctly, as it is a mains syncronized clock.
Did the clock display 50, 60 or 00 at startup?
If it indicated 50 or 60, the zero cross detection circuit is working fine.
If it indicates 00, then you should check the zero cross circuitry for errors or defective parts.

Another important issue: If you use a backup battery, it is important at first startup to first power the clock before you insert the battery.

3

[quote=“VEL417”]Are you running the clock from an AC supply?
If not, then it is normal that it does not keep time correctly, as it is a mains syncronized clock.
Did the clock display 50, 60 or 00 at startup?
If it indicated 50 or 60, the zero cross detection circuit is working fine.
If it indicates 00, then you should check the zero cross circuitry for errors or defective parts.

Another important issue: If you use a backup battery, it is important at first startup to first power the clock before you insert the battery.[/quote]

I am running the clock off my DC Agilent power supply. I guess it needs an AC source? Well, another lesson learned, right. Do I need to reset the clock?

Thanks much,
Gary

4

Remove backup battery before switching to AC source, then reinstall battery.

5

Thanks for all the re-education!
Gary

6

You’re welcome.