PSN-L Email List Message

Subject: Status of the PSN file format / capacitive measurements
From: =?ISO-8859-1?Q?Ren=E9_Tegel?= rene@...........
Date: Sat, 15 Oct 2005 21:19:50 +0200

Hi list,

2 Questions:
   I'd like to know how 'official' the PSN file format is. It is well 
described, and i'd like to let my measurement equipment also output a 
PSN file. However, i only seen a few applications that use it (winquake 
etc), which is a (semi?) commercial/paid application. However, the file 
format seems standard in the PSN network, so i like to comply to that 
standard. Is PSN3/4 file format a propierity standard or can it also 
freely be used by other aplications, and/or is it considered the 
winquake applications to be open-sourced?

  Is there any documentation on using capacitive measurements instead of 
the coil based ones? So far i saw all lehman-typed instruments equiped 
with a pickup coil. With my testing equipment i used two capacitor 
plates, each about 30cm2 large, at about 3-5 mm of eachother. On that is 
an variabele oscillator attached, with pulse counting i determinate 
position of the arm with reasonable success but no hard data on 
resolution. I am wondering if there ary any known disadvantages of such 
setup, i think it is suitable to build a Shackleford-Gundersen type this 
way as well.

kind regards,



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