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Voltage fluctuation

Posted: Thu Aug 08, 2013 12:16 am
by ohara
Hi, since a few days I noticed a drop in voltage on one of my Grooves at ca. 5pm every day. Does that mean that the device is using more power at that time? Or is it because of the electrical installation?

Re: Voltage fluctuation

Posted: Thu Aug 08, 2013 4:46 am
by SurferTim
If it is an unregulated power supply, it is probably due to daily mains voltage variations. Highest voltage is around 4am, and the lowest is around 4pm.

Re: Voltage fluctuation

Posted: Thu Aug 08, 2013 8:34 am
by ohara
Thanks.

Re: Voltage fluctuation

Posted: Fri Aug 09, 2013 1:12 am
by Lakis
It can be temperature related when it's hot voltage sensor begin to be "not accurate"
I've made a test about that on RB433AH

Also in some case lets say if u have wlan on some board when it's active "in time when sending data to clients" wlan is draining more power - voltage sensor may show less
vday.jpeg
see the time frame
I have almost same reading on all RBs

Re: Voltage fluctuation

Posted: Mon Aug 12, 2013 12:09 am
by ohara
I also thought it to be temperature/sun related for some reason. anyway, thanks for your insight.

Re: Voltage fluctuation

Posted: Tue Aug 13, 2013 11:21 am
by janisk
these are not measuring devices so they are not that accurate. Newer RouterBOARD products use different measuring chain and are not that susceptible to temperature changes.

Re: Voltage fluctuation

Posted: Tue Aug 13, 2013 2:19 pm
by SurferTim
The temperature would not explain why I get these same variations. My RB433AH is inside in the a/c under almost no client load. The temperature only varies a couple degrees. Mine is caused by the daily mains power variation.