Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
Old September 12th 05, 04:36 PM
 
Posts: n/a
Default How to test a Ceramic Capacitor?

hello,
I heard that Ceramic Capacitors rarely fail nevertheless how can one be
sure? Is there a way to test them to know if they are good? Is it
important to test these or not? Any help would be appreciated!


  #2   Report Post  
Old September 12th 05, 06:27 PM
sofie
 
Posts: n/a
Default

you can test for shorts or leakage with a standard VOM or DMM and then check
for proper capacitance value with a cap meter or DMM with capacitance
feature.

--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -



wrote in message
oups.com...
hello,
I heard that Ceramic Capacitors rarely fail nevertheless how can one be
sure? Is there a way to test them to know if they are good? Is it
important to test these or not? Any help would be appreciated!



  #4   Report Post  
Old September 29th 05, 11:31 PM
Jim Yanik
 
Posts: n/a
Default

"Asimov" wrote in
:

" bravely wrote to "All" (12 Sep 05 08:36:24)
--- on the heady topic of "How to test a Ceramic Capacitor?"

mi From:
mi Xref: core-easynews sci.electronics.repair:341943

mi hello,
mi I heard that Ceramic Capacitors rarely fail nevertheless how can one
mi be sure? Is there a way to test them to know if they are good? Is it
mi important to test these or not? Any help would be appreciated!

Ceramics can be checked for power factor and compared to the typical
rated specification of the equivalent new part. However, usually all
that is needed is a scope, since an abnormal signal is often a clue
that the cap is not working right. They don't often fail except in
high energy circuits but then they are also less used in these because
of their many disadvantages.

In general, ceramic capacitors, and other types, have losses that
increase with frequency. They behave as if they have a little bit of
series resistance and thus get hot. As you know heat is the enemy of
all components, because it often increases leakage curents and can
turn them into charcoal. Also when components heat and cool cyclically
there is a mechanical expansion and contraction that results in
material fatigue such that internal breaks can develop.

A*s*i*m*o*v

... Your E-Mail has been returned due to insufficient voltage.



I used to run them up on a TEK curve tracer,either a 576 or the 7K 7CT1N I
had in my bench scope.(I loved that little plug-in,it was SO useful).
They form a loop and if there's breakdown,the loop closes,it shows
intermittents and temp sensitivity,too.You can compare to a new cap,too.
I used the CT on caps from 0.1uf dip caps to HV caps.

--
Jim Yanik
jyanik
at
kua.net


Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Resetting controller on Ariston dishwasher bob Home Ownership 2 December 5th 06 09:56 AM
Motor capacitor sizing? Jeff Wisnia Metalworking 5 June 10th 05 10:14 PM
Questions about a Motor Starting Capacitor toller Home Repair 10 February 10th 05 05:45 AM
Capacitor substitutions Norm Dresner Electronics Repair 4 September 28th 04 11:58 AM


All times are GMT +1. The time now is 02:50 PM.

Powered by vBulletin® Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright 2004-2019 DIYbanter.
The comments are property of their posters.
 

About Us

"It's about DIY & home improvement"

 

Copyright © 2017