Guitar amps

PATGuard 3 Forum

Guitar amps

Postby Matt Macdermott » Wed Feb 20, 2013 4:42 pm

I cannot get an earth bond reading on a guitar amp I am testing even though it is a class 1 item. Should I just record that I couldnt get EB reading and just do insulation and leakage test or am I missing something? The amp is made by Acoustic Solutions.
Matt Macdermott
 
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Re: Guitar amps

Postby Alan Freeman » Wed Feb 20, 2013 7:37 pm

Matt

If all things fail, then yes, note it as no earth bond. Is there no external metalwork?? Some class 1 I have tested are in wooden/plastic cases with nothing metal at all.

What I have found on some amplifiers is that you can get a reading on the screen of the signal cables - sometimes. Just be 100% sure you are using "IT" equipment tests at 100mA - not a full 25A!!
Alan Freeman
 
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Re: Guitar amps

Postby Matt Macdermott » Thu Feb 21, 2013 9:39 am

There are only screw heads (srewed into chipboard casing as far as I can tell) and sockets for the jack plugs,I can get a reading from any of these; Im not sure what you mean by the signal cables though, are they inside the amp? Im trying to avoid taking it apart.
Matt Macdermott
 
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Re: Guitar amps

Postby Matt Macdermott » Thu Feb 21, 2013 9:42 am

Sry I meant I cant get a reading from the screws or jack plugs
Matt Macdermott
 
Posts: 17
Joined: Mon Mar 12, 2012 5:24 pm

Re: Guitar amps

Postby Alan Freeman » Thu Feb 21, 2013 2:18 pm

Matt

I meant the signal plugs/sockets. Some are at earth - some are at signal screen which is different.

If these have failed, you will have to test as Class 1 No exposed Earth.
Alan Freeman
 
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Location: Bedford

Re: Guitar amps

Postby Matt Macdermott » Thu Feb 21, 2013 2:25 pm

OK thanks for your help, I will try all of the signal sockets
Matt Macdermott
 
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