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Voltage Surges

Which product is right for your exact requirements

Voltage Surges

Postby ArChester » Wed May 18, 2005 9:00 pm

Hi

18 months ago I purchased a old Farm House. It is on the end of the mains supply run. There is one transfomer serving just our house. 3 Phase. The main problem is the blowing of lightbulbs. I would reckon we change about 3-4 a week.

A year ago I called Central Networks and they monitored the phases. The one that served the house over a week had peaked at 267volts. They say they tapped down the transformer. They went away and the problem persisted. They monitored the supply again and changed some tails on the transformer. Still no difference. I would like to moitor the supply myself over a period of say a month.

Iam computer savvy but not to hot with the electrics.

How can I monitor it and print out a result.
ArChester
 

Postby Sarah » Thu May 19, 2005 12:34 pm

Hi

Thank you for your post.

The main problem here is that you wish to measure 3 phases. All of the oscilloscopes that we do are 2 channel and would thus not enable you to monitor 3 phases. You could use 2 scopes but they would need to be on seperate computers.

What you would need is a high voltage, isolating, differential probe. The size of this would depend on the size of the voltage you are looking at. If it is normal mains electricity of 240V then you could use our X10/X100 voltage probe which would fulfill your needs.

You would need a probe for all channels.

There is then a couple of ways you can go about monitoring. You could set the scope up with a trigger and infinate persistance so that any spikes would be drawn on the screen and would not disappear. This would enable you to see the quality of the electrical signal but could not tell you when these spikes happened.

The other way of going about it would be to set the trigger level slightly higher than the voltage level. This way if any spike came in it would see it and trigger on it. You could then set it to save on trigger and it would save each indivdual waveform of every time this happened. The only problem with this could be that if you are looking for positive spikes, it would not record any negative spikes.

As for which scope you would need, I would suggest the ADC-212/3 would be a good choice as this is also used in automotive diagnostics which looks at spikes and small signal changes.

Hope this helps

Best Regards
Sarah
 

Voltage Surge

Postby archester » Tue Jun 07, 2005 9:54 pm

Hi

Thanks for the advice. The farm house only runs off the blue phase.
Central networks returned yesterday and monitored the supplt for 24 hours! and guess what no spikes, variation fron 228 to 251 volts. I only need to monitor the one phase do I still need the same equipment?

Andrew Chester
archester
 

Postby Sarah » Thu Jun 09, 2005 10:12 am

Hi

Thank you for your post.

Yes, if you only require one phase then I would recommend the ADC-212/3. There are a couple of monitoring methods, as I outlined before. You would definately need an isolating attenuating probe to conect to the voltage.

Hope this helps

Best Regards
Sarah
 


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