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-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 06-01-2002, 02:08 PM
gmask's Avatar
Man of many masks
 
Join Date: Nov 2001
Location: Los Angeles
Posts: 777
Question Oscilloscope advice

What features do I need in an oscilloscope for checking the condition of the ignition system in a W114 model cars?

I have an old Tektronix scope but I don't know if it really fits the application.

TIA

__________________
MB 72 250 M130.923 114.011 170k The Beauty
Reply With Quote
  #2  
Old 06-01-2002, 03:33 PM
LarryBible
Guest
 
Posts: n/a
An ignition scope is quite specialized, however, with a high voltage probe, you can use about any oscilloscope. Remember, modern ignition systems produce 50KV and more. Point ignitions produced something in the area of 15KV.

Be careful,
Reply With Quote
  #3  
Old 06-01-2002, 03:57 PM
gmask's Avatar
Man of many masks
 
Join Date: Nov 2001
Location: Los Angeles
Posts: 777
Quote:
Originally posted by LarryBible
An ignition scope is quite specialized, however, with a high voltage probe, you can use about any oscilloscope. Remember, modern ignition systems produce 50KV and more. Point ignitions produced something in the area of 15KV.

Be careful,
Can you recommend any literature on the subject? Is a 1972 car electronics considered modern?
__________________
MB 72 250 M130.923 114.011 170k The Beauty
Reply With Quote
  #4  
Old 06-01-2002, 04:23 PM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Most of what you want to see can be viewed on the primary, which can be viewed with most any type of scope.

As to the 72, it was point triggered electronic ignition and falls sort of in the middle. There were three versions of the point triggered electronic systems and they each have different points to look at primary. The first version had the coil constantly grounded. Dwell was viewed at the small round connector at the end of the wire comming from the points.
__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote
  #5  
Old 06-02-2002, 12:21 AM
gmask's Avatar
Man of many masks
 
Join Date: Nov 2001
Location: Los Angeles
Posts: 777
Question

Quote:
Originally posted by tkamiya
Most scopes made for electronics work comes with probe rated for 1KV. (if I remember correctly). As most scope have an FET at the input after the attenuator, if you put too much voltage on it, it will either blow the protection diode, attenuator, or the FET at the input amplifier. Either way, it will be quite expensive to repair.

You might want to check into a big high voltage probe usually used for TV CRT tube work.
I think I've found one that would work. It's 55KM and 1090 Mega Ohms. Looks like a death ray wand.. anyway..

It looks like it may have the coorect connector for my scope as well. The next part will be to figure how to gauge the inputs and what connections to make ;-)
__________________
MB 72 250 M130.923 114.011 170k The Beauty
Reply With Quote
  #6  
Old 06-02-2002, 01:26 PM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Since you are determined to look at secondary, what are you looking for?
__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote
  #7  
Old 06-03-2002, 11:25 AM
Registered User
 
Join Date: Jun 2000
Location: Saugus, CA USA
Posts: 2,042
Death ray wand, yes thats what they look like.

What kind of scope do you have? If it is old it might have a tube front end, they are a lot stronger.

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 02:36 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page