The Cyndustries List

Thanks Richard, 

for the great suggestion of actually measuring the BIAS Voltages 
directly as part of the test!  

Also, hi Mark!

Of course you're right, the waveshaping section has no influence on 
one volt to the octave calibration, it was at the end of the day and 
the last thing I added before going home.

I've tested and calibrated so many Zeroscillators by now that I wrote 
the whole procedure strictly from memory, but I guess I wasn't
completely sure there was no intereaction and figured it was 
"better to be safe than sorry"  :)

(People shouldn't adjust the low frequency symmetry trimmer though, 
unless thay're prepared to recalibrate the 1 volt to the octave trimmer).
(Just don't do it!  LOL!)

Both of these suggestions will be incorporated into the next revision 
of the ZO Testing & Calibration document in the near future.  

I'm going to delay updating it for a bit becuase we may think of another 
thing or two to add by then!  Please keep the suggestions flowing!

Best to All!


Cynthia 

http://www.cyndustries.com/

http://launch.groups.yahoo.com/group/ZO_group/

------

--- In ZO_group@yahoogroups.com, "tuninghead" <thruzero@...> wrote:
>
> --- In ZO_group@yahoogroups.com, "Cynthia" <cynthia.webster@> wrote:
> 
> Hi all you Zeroscillinos,
> 
> Glad to be aboard this group as well.
> 
> Cynthia did a great job condensing the testing and adjustment
> procedure into this document.  However, I noticed a tiny error in step
> 16 and in the interest of correctness and completeness, I type the
> following:
> 
> [ALERT: ADJUSTMENT CAN CHANGE 1V /OCTAVE CALIBRATION] 
> does not apply here.  Adjusting the quadrature shape control has 
> no effect on the 1V/oct calibration.
> 
> Also, a word about turning any of the trimmers, and that is, you
> probably don't have to.  All important voltages within the ZO are
> derived from a precision reference and unless you work on Mercury or
> Pluto, you probably won't have to turn anything.  The exception may be
> the 1v/oct trimmer in order to match your (uncalibrated) equipment. 
> Ahem.  And remember, let the thing warm up and settle before you
> consider doing anything.
> 
> Just my $1/50,
> --Mark Barton
> 
> 
> > 
> > 16. TEST: QUADRATURE (Advanced Procedure!)
> > 
> > [ALERT: ADJUSTMENT CAN CHANGE 1V /OCTAVE CALIBRATION]
> > 
> > Please Return to the Initial Set-up Conditions above in lines number
> 1 & 2.
> > 
> > Turn both the MORPH_A and the MORPH_B Knob to full CCW or closest
> > to the TRIANGLE Icon next to the knob.
> > 
> > Have look at the MORPH_90 Output on a scope and adjust trimpot VR501
> > (labeled QUADRATURE and located on the end of CYN109-B the bottom
> > PC board in the three-board sandwich).
> > 
> > Play "pin the top on the mountain" with the trimpot until the
> triangle looks
> > complete.
> > 
> >
>