OK -- It appears that I very close to correct damping -- my fingers are a
bit flatter from being smashed between the two Neodymiun magnets while I got
them mounted in the mounting.  After several attempts only to have the
magnets slam together in a flash and send the spacers flying, and then
having to separate them, I got them clamped into the holder.

On a 1/16" swing of the boom it appears to be "critically" damped, that is
it crosses center then back to center and stops.

I do not have the cover built yet, however it is in a closed carpeted
closet.  The insulated cover box is this weekends project.

Comments please.
Jan Marshall
jandmarshall@............
www.cableone.net/jandmarshall
Nampa, ID

  -----Original Message-----
  From: psn-l-request@.............. [mailto:psn-l-request@.................
Behalf Of ChrisAtUpw@.......
  Sent: Wednesday, October 02, 2002 12:05 PM
  To: psn-l@..............
  Subject: Re: New Lehman on line (almost)


  In a message dated 02/10/02, randallpratts@.......... writes:


    With the boom blocked I don't get a step function as in fig 4.5.1a but
rather an exponential decay.  I find that a bit confusing since I put a
steady battery voltage across the coil but I have attempted to determine the
curve and adjust subsequent readings by the correct factor over time.  I'm
also not clear about para 9 where a0 is computed.  What does that formula
really mean?


  Hi Randy,

        Looking at you Website, I note that you are using the PSN amplifier.
This has a high pass filter in it which will give an exponential response to
a step signal.
        If you can refer to the particular section, we may be able to help
you. My para 9 has no a0 in it and doing a text search, there are several
references to variables, but none with just a0.

        Regards,

        Chris Chapman





OK --=20
It appears that I very close to correct damping -- my fingers are a bit =
flatter=20
from being smashed between the two Neodymiun magnets while I =
got them=20
mounted in the mounting.  After several attempts only to have the =
magnets=20
slam together in a flash and send the spacers flying, and then having to =

separate them, I got them clamped into the holder.  =

 
On a=20
1/16" swing of the boom it appears to be "critically" damped, that is it =
crosses=20
center then back to center and stops.
 
I do=20
not have the cover built yet, however it is in a closed carpeted =
closet. =20
The insulated cover box is this weekends project.
 
Comments please.
Jan=20
Marshall
jandmarshall@............
www.cableone.net/jandmarshallNampa,=20
ID 

  
-----Original Message-----
From: =
psn-l-request@.................
  [mailto:psn-l-request@...............On Behalf Of=20
  ChrisAtUpw@.......
Sent: Wednesday, October 02, 2002 =
12:05=20
  PM
To: psn-l@..............
Subject: Re: New =
Lehman on=20
  line (almost)

In a=20
  message dated 02/10/02, randallpratts@.......... writes: 


  With the boom blocked I don't get a step function as in =
fig=20
    4.5.1a but rather an exponential decay.  I find that a bit =
confusing=20
    since I put a steady battery voltage across the coil but I have =
attempted to=20
    determine the curve and adjust subsequent readings by the correct =
factor=20
    over time.  I'm also not clear about para 9 where a0 is =
computed.=20
     What does that formula really mean?


Hi Randy,=20
  

      Looking at you Website, I =
note=20
  that you are using the PSN amplifier. This has a high pass filter in =
it which=20
  will give an exponential response to a step signal.=20
  
      If you can refer to the =
particular=20
  section, we may be able to help you. My para 9 has no a0 in it and =
doing a=20
  text search, there are several references to variables, but none with =
just a0.=20
  

      Regards,=20
  

      Chris Chapman=20