EG8010 frequency Accuracy

Author	Message
tinyt Guru Joined: 12/11/2017 Location: United States Posts: 441	Posted: 04:39pm 26 Jan 2025         oreo said   So I have been running an EG8010 based inverter for awhile now, and recently connected a circuit which has a clock on it.  The clock was running quite fast, so I compared the frequency of the inverter to the mains and found: Mains:  59.98Hz Inverter: 60.18Hz This would suggest a crystal accuracy of 3000 PPM. Looking at the board, I can see the 2 capacitors connected to the crystal are present. I would prefer to not take the system down till the weekend, so thought I would float this question. What kind of frequency accuracy are you seeing with your EG8010 inverter? Looking on Digikey, I see crystals in the correct package with 10ppm frequency accuracy and stability.  The poorest frequency accuracy crystal I see, is 100ppm. Thoughts? I also have the same problem. My pool timer uses synchronous motor and it also runs fast. I have to reset the timer after a few days. I am guessing that the EG8010 was originally designed for 50Hz and they just added an option for 60Hz but the result is not as accurate.