On Mon, 4 Nov 2002, Doug Coward wrote:
> You wrote:
> > One last thing - does anyone have an idea of what the "SW" and "OP" jacks
> > at the bottom of the front panel are,
>
> Here is a quotes from a GP-10 brochure:
> "The OP termination is the system's mode control bus.
> For centralized integrator mode operation, the SW
> switch control is patched to the OP bus."
>
> My take on this is that if you are not controlling
> the operation mode from a digital computer or other
> external device, then you need to jumper OP to SW
> for each integrator in order to control the mode
> from the front panel buttons.
> IC = Initial Condition mode
> HD = Hold mode
> OP = Operate mode
> RO = Repetitive Operation mode
Ummm, I seem to have an older GP-6 that has no such front-panel switches.
It just has the 'Y/POT Select', 'X Select' and 'Compute time' knobs on the
front (along with the 8 coefficient pots). There's also four small
potentiometers, with a slotted shaft (for using a tweaker screwdriver for
adjustment) along the bottom of the front (on the banana jack half)
which are unlabelled.... any ideas what they are for? They seem to be
missing from the model pictured on COMDYNA's web site.
> > and how to use the multipliers? I
> > can't quite seem to get them to 'multiply'...
I guess you can attribute my lack of understanding this part to my lack of
usage of analog computers... sometimes engineers need to be a little more
reasonable in their descriptions IMHO.
> Here is a quotes from a MICROPATCH brochure:
> "Two multiplier networks may be arranged as
> multipliers, dividers, squarers, or square root
> extractors of input variables. Two attenuator-switch
> networks are needed to electronically program a
> multiplier or divider. One output is patched to the
> "X" terminal; the other is patched to the "Y" terminal.
Ok, got that
> When the network is patched as an input to an
> operational amplifier that has a resistor as the
> feedback, the amplifier's output is the product
> of the input variables. When the network is
Does 'the network' refer to the output of the multiplier ( the terminal
not labeled 'x' or 'y')? If so, that's what I've been doing...
> patched as the amplifier's feedback, the amplifier
> output is the quotient of the two input variables."
But I just used up the X and Y inputs, how am I supposed to use the
multiplier as feedback for the op-amp?
It'd be helpful if someone had an example schematic or block diagram of
some sort...
Pat
--
Purdue Universtiy ITAP/RCS
Information Technology at Purdue
Research Computing and Storage
http://www-rcd.cc.purdue.edu
http://dilbert.com/comics/dilbert/archive/images/dilbert2040637020924.gif
Received on Mon Nov 04 2002 - 14:46:01 GMT
