Measuring "capacitor drift"?
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Measuring "capacitor drift"?

 
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steamer
Guest
Posted: Mon Nov 07, 2005 1:30 am    Post subject: Measuring "capacitor drift"? Reply with quote
--Have recently learned of this phenom. Can someone describe a
method one relatively unversed in electronics might use to measure
change in capacitance? Not necessary to have the cap in the circuit
when measuring..

--
"Steamboat Ed" Haas : Doodle doodle dee
Hacking the Trailing Edge! : Wubba wubba wubba...
http://www.nmpproducts.com/intro.htm
---Decks a-wash in a sea of words---

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Jamie
Guest
Posted: Mon Nov 07, 2005 1:35 am    Post subject: Re: Measuring "capacitor drift"? Reply with quote
steamer wrote:

Quote:
--Have recently learned of this phenom. Can someone describe a
method one relatively unversed in electronics might use to measure
change in capacitance? Not necessary to have the cap in the circuit
when measuring..

use a meter with a cap function on it.,

subject it to freezing spray and then with
a hair dryer.
log down the change in value.


--
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5
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steamer
Guest
Posted: Mon Nov 07, 2005 5:35 pm    Post subject: Re: Measuring "capacitor drift"? Reply with quote
Jamie <jamie_5_not_valid_after_5_Please@charter.net> wrote:
: subject it to freezing spray and then with
: a hair dryer.
: log down the change in value.
--Hey that's neat! So it's a temperature thing and not a
time-in-service thing?

--
"Steamboat Ed" Haas : Doodle doodle dee
Hacking the Trailing Edge! : Wubba wubba wubba...
http://www.nmpproducts.com/intro.htm
---Decks a-wash in a sea of words---

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John Popelish
Guest
Posted: Mon Nov 07, 2005 5:35 pm    Post subject: Re: Measuring "capacitor drift"? Reply with quote
steamer wrote:

Quote:
--Hey that's neat! So it's a temperature thing and not a
time-in-service thing?

The high-K ceramic types have both effects. Electrolytic caps can
also have a slow loss of capacitance over time, as the electrolyte
escapes.

Here is a good tutorial on the many differences of capacitor types:
http://my.execpc.com/~endlr/index.html
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