Tech Forum Posting

Posted by Cindy RPsgT on August 25, 2002 at 19:46:45:

In Reply to: Electrical baseline vs Mechanical baseline posted by Midnight on August 25, 2002 at 17:05:06:

www.aptweb.org/a2z/A2Z_1999/winter has a good article about filter settings and calibrations or go to www.aptweb.org, look under A2Zzz's, back issues, winter 1999 for the article. Or you can buy it from them for $10 members, $15 non members.
Going back to the analog days, there's 2 options for rolling the paper "chart" (paper only) and "chart and pens".
Rolling the paper with the "chart" only will show you the mechanical baseline or if the spacing between the pens is the same distance. (The pens are not active.) If the mechanical baseline needs to be corrected, the distance between the lines the pens make will not be equally spaced. (pardon the artwork:)
1 ________________________
. ________________________
2
.
3 ________________________
.
4 ________________________
.
5 ________________________
.
2 would need to be adjusted because the (mechanical) baseline isn't equally spaced between the others.
.
Rolling the paper with "chart and pens" will activate the paper and pens both, showing the electrical baseline. If the electrical baseline is off, you'd see the effected line go 'jump' from it's original baseline and return when the pens are off. Turning the pens on and off should be done several times.
1 _________________________
.
2 ____-----____----____----
.
3 _________________________
.
Again, 2 would need to be adjusted because the (electrical) baseline jumps when the pens are activated.
(Sorry, it's about as good as I can do on a computer.)

Follow Ups:

• Re: Electrical baseline vs Mechanical baseline im impressed 23:11 8/26/02 (1)
  • Re: Electrical baseline vs Mechanical baseline Cindy RPsgT 08:11 8/27/02 (0)

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