Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #46  
Old 06-30-2003, 10:41 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,777
Forgot about the "shatter" factor...
Actually, I think I will just throw mine away cuz , after blowing so many over the years , I now have learned not to attempt to find the Resistance/continuity of a live 220 AC circuit....
Reply With Quote
  #47  
Old 07-01-2003, 10:01 AM
Registered User
 
Join Date: Aug 2001
Location: secret
Posts: 3,044
Quote:
Originally posted by Arthur Dalton
Forgot about the "shatter" factor...
Actually, I think I will just throw mine away cuz , after blowing so many over the years , I now have learned not to attempt to find the Resistance/continuity of a live 220 AC circuit....
LOL!! There should be a 'smoke factor' involved in that test!!
Reply With Quote
  #48  
Old 07-01-2003, 10:04 AM
Registered User
 
Join Date: Aug 2001
Location: secret
Posts: 3,044
Quote:
Originally posted by Benzwood
I'll sue!!


Please take a number and have a seat, we'll be with you ASAP!
Reply With Quote
  #49  
Old 07-01-2003, 03:49 PM
Benzwood's Avatar
Registered User
 
Join Date: Jun 2002
Posts: 300
My curiosity is still killing me about the function of the thing I posted earlier...



The arrow on the left points to a spring attached to the circuit board.

When the case is closed makes contact with the small rectangle on the right, which is aluminum in appearance and presumably conductive.

The bigger square on the right is a clear piece of plastic on top of a white double-sided adhesive sheet.

Anybody?
__________________
1992 300E
1995 E320
1999 E320 Wagon
Reply With Quote
  #50  
Old 07-01-2003, 05:56 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,777
I think that is a Noise [ Hash] shield, like a shielded cable for engine noise RF...
I have the same on the inside cover of a Sun LS2000 scope...
Reply With Quote
  #51  
Old 07-01-2003, 06:51 PM
Benzwood's Avatar
Registered User
 
Join Date: Jun 2002
Posts: 300
That was my first thought too, but the bulk of it seems to be plastic, not metallic... I would have expected a big swath of foil-like substance instead. Is your shield metallic?
__________________
1992 300E
1995 E320
1999 E320 Wagon
Reply With Quote
  #52  
Old 07-01-2003, 07:15 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,777
It is metal with a plastic covering.
You will notice the covering is not where the spring must make contact in order to ground the shielding to the circuit board ground through the spring when put back together.....
Reply With Quote
  #53  
Old 07-01-2003, 09:45 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,777
Little more info on the shield from a R&D friend..

These shields are installed on any meters that will read freq.
They are there to block the atmospheric frequencies of the entire Freq Band the meter is capable of reading ...and , as noted , the spring grounds them out at the chassis/board neg side...
Hash/Noise block.....
Reply With Quote
  #54  
Old 07-02-2003, 12:41 AM
Benzwood's Avatar
Registered User
 
Join Date: Jun 2002
Posts: 300
Ok, but, I think, mine is not metallic. So out comes the screwdriver to open mine again and here's the deal...

The white part in the photo that I thought was double-sided adhesive is actually the back of an adhesive sheet of that metallic aluminum(?) stuff.

The little rectangle of aluminum facing the interior is part of that same sheet folded over, providing continuity to the whole sheet. And the little spring makes contact with that little rectangle.

The clear plastic is apparently just to cover the adhesive so stuff doesn't stick to it.

Now, why in the world they wouldn't just stick a big square of the stuff on with the aluminum facing the interior, and do away with the whole folding-over and covering w/plastic thing, I don't know. So the mystery continues.

But, the general purpose of it as a frequency shield makes sense. And hopefully it isn't too critical if there are a couple little tears in it as mine now has, hehe.
__________________
1992 300E
1995 E320
1999 E320 Wagon
Reply With Quote
  #55  
Old 07-02-2003, 01:15 AM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,777
Likely that it comes in rolls from manufacturer and the alum is glue dipped .. so, when they take it off the roll , it isn't stuck to its self... they just peel off a side and apply to the inside case...
Reply With Quote
  #56  
Old 07-02-2003, 05:18 PM
Benzwood's Avatar
Registered User
 
Join Date: Jun 2002
Posts: 300
Hmm...



Nope, because then the little rectangular part facing inside would have adhesive on it, and it doesn't.

Mystery continues...
__________________
1992 300E
1995 E320
1999 E320 Wagon
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 02:04 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page