[sdiy] FW: earthing??

[Laurie Biddulph]

The proper way is to use a device called a MEGGER which injects a 
high-voltage to test the integrity of earth and mains connections. Too 
expensive for us lower mortals so an impedance measurement of 0 ohms should 
be enough

Best Regards

(Mr) Laurie Biddulph
Phone: +61 (0)2 4340 0938
Mobile: 0400 257 645

Elby Designs
ABN: 70 022 727 605
http://www.elby-designs.com

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----- Original Message ----- 
From: "Dan Snazelle" <subjectivity at hotmail.com>
To: <kingravine at comcast.net>; "sdiy" <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, November 25, 2008 11:35 PM
Subject: RE: [sdiy] FW: earthing??


>
> i switched out the SCREW holding in the earth line to the psu....it now 
> SEEMS ok....maybe the earth wasnt tight enough???
>
> is there  simple way to test for danger?? (other than seeing if + or_ are 
> on the case with a dvm??
>
> thanks
>
> --------------------------------------------
> check out various dan music at:
>
> http://www.myspace.com/lossnyc
>
>
> http://www.soundclick.com/lossnyc.htm
>
>
> http://www.indie911.com/dan-snazelle
> (or for techno) http://www.myspace.com/snazelle
>
>
>
>
>> From: KingRavine at comcast.net
>> To: subjectivity at hotmail.com; synth-diy at dropmix.xs4all.nl
>> Subject: Re: [sdiy] FW: earthing??
>> Date: Mon, 24 Nov 2008 20:25:48 -0500
>>
>> Hi Dan,
>>
>> Measure the voltage between the earth ground and the chassis.  If it's at 
>> or
>> near either +/- 15V, you can almost guarantee a hidden short to the rail
>> somewhere.  Might help you track down the issue a little more quickly
>>
>> Also:  If you're using any metal stand-offs beneath your PCBs, perhaps 
>> one
>> is touching a trace?
>>
>> Dave Magnuson
>>
>>
>> ----- Original Message ----- 
>> From: "Dan Snazelle"
>> To:
>> Sent: Monday, November 24, 2008 7:58 PM
>> Subject: [sdiy] FW: earthing??
>>
>>
>>>
>>>
>>>
>>> i am putting in the final power supply for my project. it is a dual 12 
>>> or
>>> 15 volt supply. (power one)
>>>
>>> Now i have been earthing both the case and the PSU off of the earth tab 
>>> on
>>> the AC inlet with no problem all week. But strangely, when i hooked this
>>> up today I initially thought the PSU was busted and only after a few 
>>> hours
>>> of troubleshooting did i figure out that it worked fine when  I
>>> disconnected the wire from the  instrument CASE (but not from the PSU
>>> body)
>>>
>>>
>>> I WANT to be able to earth the case of the instrument...so any ideas as 
>>> to
>>> what might be going on?
>>>
>>> my first thought was that maybe a positive rail or negative rail was
>>> touching the panel through a pot but at least on visual inspection this
>>> doesent seem to be the case.
>>>
>>> (and by the way i AM now soldering my connections to the pins of the 
>>> pots,
>>> not the holes)
>>>
>>> thanks
>>> --------------------------------------------
>>> check out various dan music at:
>>>
>>> http://www.myspace.com/lossnyc
>>>
>>>
>>> http://www.soundclick.com/lossnyc.htm
>>>
>>>
>>> http://www.indie911.com/dan-snazelle
>>> (or for techno) http://www.myspace.com/snazelle
>>>
>>>
>>>
>>> _______________________________________________
>>> Synth-diy mailing list
>>> Synth-diy at dropmix.xs4all.nl
>>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>
>
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