Re: Shameless Plug

From: Nicholas O. Lindan (see_at_sig.com)
Date: 11/30/04 

Date: Tue, 30 Nov 2004 15:29:09 GMT

> Why do half the engineers call [PID] "Proportional-Integral-Derivative"
> and others call it "Proportional-Integral-Differential?"

In 'Control Speak':

 Differential: the amount of hysteresis in an on/off controller, such
               as a home thermostat.

 Derivative: The term D * dPV/dT in a PID controller where: D == derivative
               gain; PV = process variable; T == time. Some controllers
               use D * dE/dT where E == error.

 Lesson: Half of everything is bunk. 

-- 
Nicholas O. Lindan, Cleveland, Ohio
Consulting Engineer:  Electronics; Informatics; Photonics.
Remove spaces etc. to reply: n o lindan at net com dot com
psst.. want to buy an f-stop timer? nolindan.com/da/fstop/
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