On Thu, 07 Aug 2003 15:05:39 -0000, you wrote:
Linearity is only defined over the range 1kHz to 10khz, see note 5 in
the spec sheet. For practical purposes it extends from about 200Hz
to 12 - 13kHz, the bottom end depends on the filter capacitor. I am
retired now and without the necessary test equipment I can't do full
tests, but from empirical tests the response falls very rapidly, e.g.
@4.25kHz Vout= 2.5 @8.5kHz Vout=5, @12.75kHz Vout=7V & @17.5kHz Vout=
7.3V.
Have a look at the graph "Tachometer linearity Vs R1" on page 6
With an input voltage of 12V, Frequency of 1000Hz and a R1 value of
350K it's 0.2%
The input frequency is set by steps per unit and velocity, get your
min/max step rate between 1KHz and 10K and it's about as linear as it
gets.
I will post a hand drawn circuit of my revised circuit later to-day.
Are you putting it in Mach1Mach2 files section?
--
Steve Blackmore
