PSN-L Email List Message

Subject: Re: resistive damping
From: Marchal van Lare vanlare@..............
Date: Fri, 12 Nov 1999 07:03:17 -0500


Hi all,

I placed a resistance parallel with the coil, but the damping =

does not seem to occur. The problem is, the pendulum keeps swinging =

(sometimes even visibly!) and for now it did not had any plans to =

cease its motion.

My coil has a resistance of ~500 Ohm and I am using a 1000 Ohm
resistor.

A 'diagram' would look like the following:


)------R--------> to the amplifier
)      R
)      R
)------R--------> to the amplifier

)=3Dcoil
R=3Dresistance
----=3Dwiring

To show the output of the instrument, I have connected it to an
old PC via an old amplifier and 8 bit A/D card (I will have Larry's
card in the near future), but the motions of the pendulum keep =

saturating the A/D card.

Any input?

Thanks in advance.

Best regards,

Marchal van Lare






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Larry Cochrane <cochrane@..............>