[time-nuts] Line Voltage [Was: Anyone (ideally in the UK) ...]
hmurray at megapathdsl.net
Sun Jan 1 06:09:13 EST 2017
The nice thing about the APC units is that they are close to free if you are
already going to purchase a UPS.
I agree that something like the Dranetz 658 would be better, but a quick peek
at eBay shows prices far beyond what I'm willing to pay.
> What's the sample rate on your APC UPS?
I don't know what the internal sampling rate is. The API is
tell me the current voltage
tell me the lowest voltage since the last time I asked
tell me the highest voltage since the last time I asked
I think I decided it's an 8 bit ADC so the resolution is far from wonderful.
(The step size on a couple of handy readings in 0.7 volts. 8 bits gives a
full scale of 180 volts.))
I have a hack that reads as fast as it can. If nothing interesting has
happened, it adds a line to the log file every 5 minutes. If the min or max
voltage has change enough, it logs a line now. That gives me reasonably
accurate timing on short glitches without cluttering up the log file with
These are my opinions. I hate spam.
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