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Measuring "capacitor drift"?

S

steamer

Jan 1, 1970
0
--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..
 
J

Jamie

Jan 1, 1970
0
steamer said:
--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.
 
S

steamer

Jan 1, 1970
0
: 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?
 
J

John Popelish

Jan 1, 1970
0
steamer said:
--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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