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Coffee Machine

PostPosted: Tue Nov 15, 2011 6:17 pm
by edutech
Using a simple Primetest 100 device we obtained a very low Insulation Resistance value on a coffee machine.

It was thought that the AUT may have been fitted with a surge protection device. My question is: Would a surge protection device have this affect? I understood that surge protected appliances wouldn't return any value for Insulation Resistance because they are designed to limit the voltage.

Thanks in anticipation.

Re: Coffee Machine

PostPosted: Tue Nov 15, 2011 7:43 pm
by Alan Freeman
You are quite correct that a surge protect plug/socket will limit the voltage to around 300v. This is done by shorting the live to earth the discharge the surge. The Primetest 100 will only do 500v tests, so will always trigger the surge protect.

My tetser will perform a 250v test, thus staying below the trigger point.

Alan

Re: Coffee Machine

PostPosted: Wed Nov 16, 2011 1:05 pm
by edutech
Alan

Thank you for your response.

Re: Coffee Machine

PostPosted: Sun Nov 20, 2011 10:25 pm
by stoneworld
you could try to power the heater up and get it warm before testing it.

Re: Coffee Machine

PostPosted: Tue Mar 27, 2012 12:07 pm
by bestcofee
I wondered why my cats were lined up! Do you think they want my autograph?