Voltage calibration without voltage meter

Submitted by Guest on Mon, 25/03/2013 - 21:53

Hi guys,

maybe it's a nonsense question, but... my arduino with AC/AC 9V/800mA transformer connected following the guide gives me measures of voltage of 254.xx volts with the STD value of 234.26 voltage calibration.

I thought that the measure I get should be more or les the voltage I have contracted, 230V, so I adjusted the voltage calibration value to 218.00 (after trial-error) and now the measures are +/-232V.

Is that OK? I don't have access to a voltage meter to check, but I think I can assume that the energy company is supplying me that voltage?

Thanks!

Re: Voltage calibration without voltage meter

Submitted by fluppie007 on Mon, 25/03/2013 - 22:00.

If I were you I would try to borrow a Voltage meter from a friend/co-worker. This is just guessing. I should have 230V and I get 238.2V...

Re: Voltage calibration without voltage meter

Submitted by Robert Wall on Mon, 25/03/2013 - 22:48.

If you are in Europe, the voltage could be between 207 V and 253 V. If you are serious about constructing your own systems, you really need a reasonable multimeter. This one will read 230 V with an uncertainty of less than 6 V (if it shows 230, the true voltage could be between 224.24 V and 235.76 V) and will cost around €22.

Re: Voltage calibration without voltage meter

Submitted by gnumengor (not verified) on Tue, 26/03/2013 - 18:30.

Thanks both!

I will manage to get one of those :)

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