DEC AXV11-C analog board

[Douglas Taylor]

Put one together with back to back 9V batteries and a 5K pot.  Does 
exactly what I wanted.

The Data Translation board is set up for SE inputs and +/-10 V input range.
Was able to apply a series of DC voltages to the DT2762 board and record 
the A/D value using ODT (tedious, but works OK).
Using Octave (Linux) was able to convert the A/D 2's complement Octal 
numbers to decimal and plot input voltage versus A/D decimal value.  
Expected to see a nice clean linear plot.
The one DT2762 seemed to 'drop' bits, while the newer one seemed OK.

Next step is to capture a time varying signal and see if the A/D output 
follows the input correctly.  I'd like to use Macro-11 to manage the A/D 
board and Fortran to deal with the data.
What is the Fortran or F77 interface with Macro-11 routines?

Doug

On 2/13/2022 3:40 PM, Henk Gooijen via cctalk wrote:
> Two batteries in series, using the “middle” as 0V reference.
> The “+” is V+, the “-“ is V-.
>
> Van: Douglas Taylor via cctalk<mailto:cctalk at classiccmp.org>
> Verzonden: zondag 13 februari 2022 18:05
> Aan: Jon Elson via cctalk<mailto:cctalk at classiccmp.org>
> Onderwerp: Re: DEC AXV11-C analog board
>
> Is it possible to construct a battery driven circuit that
> will present both positive and negative voltages at the
> input?  A bridge of some sort?
>
> Doug
>