The AC accuracy is very tight here in the U.S. By law, if I remember. I know the AC accuracy in Russia is horrific or non-existent. (I do the firmware for alarm systems. Russia was so bad we had to add installer-adjustable offsets to correct the system time by seconds per day.)

Is there anywhere that the AC accuracy of other countries is listed? I.e., India, China, etc.

Thanks,
--Rich

 

Voltage and frequency may be subject to very considerable variations in some regions. I am not sure whether the official specifications have much meaning in some cases. Here is a Wikipedia entry - not much to say about variations, but check out Afghanistan! http://en.wikipedia.org/wiki/Mains_electricity_by_country

This can be so bad that for instance the old-fashioned types of synchronous motor based clock or electromechanical time switches are not practical to use - the frequency may be erratic or even consistently in error, so timekeeping can be unreliable.

In the case of equipment designed for international use, the required range of input voltage may be very considerable, say from a 110V supply running 30% low to a 240V supply running 30% high - a nightmare!

Edit: another link - see further links at foot of page. http://www.gbaudio.co.uk/data/mains.htm

 

Thanks, Adjuster! It did help.

--Rich