Newbie Q: Changed values of resistors when built in

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Eurocide

Active member
Joined
Nov 17, 2005
Messages
35
Location
Germany
I'm still on the error search in my GSSL.
There came a general question up to me:
I measured every resistor before soldering it. After setting it in it has got another value than outside.
E.g: 1k before and 760 Ohm after putting it in the board. Measured directly at the resistor itself, not at the soldering joints.

Is this normal - and why? Kirchhoff's law?
If not - what possible error could this be?
 
resistors do change slightly when soldered, although not to the extent that you see. so do other components, i imagine.


they also change value after vibration.
we buy these expesnsive 1% burden resistors for our ct's, and then put them in the ultarsonic bonder, which changes them by about 1/2 percent!
pain in the rear.
 

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