HP1740A X-Y Mode

[Andrew Holme]

I would like to build the Lorenz Attractor circuit
http://frank.harvard.edu/~paulh/misc/lorenz.htm mentioned in the recent
"Neato chaotic equations for analog computers" thread, but my HP1740A 'scope
has no external-X horizontal input.

On the back of the 1740A are 3 BNC sockets labelled HORIZ, VERT and Z-AXIS
for connecting a 1607A logic analyzer. I presume these work when the yellow
"STATE DSPL" button is depressed? Does anyone know what voltage levels are
required to drive these inputs? I have no data on the 'scope ...

Thanks,
Andrew.

 

[John Larkin]

On Fri, 24 Dec 2004 14:04:48 -0000, "Andrew Holme" <andrew@nospam.com>
wrote:

I would like to build the Lorenz Attractor circuit
http://frank.harvard.edu/~paulh/misc/lorenz.htm mentioned in the recent
"Neato chaotic equations for analog computers" thread, but my HP1740A 'scope
has no external-X horizontal input.

On the back of the 1740A are 3 BNC sockets labelled HORIZ, VERT and Z-AXIS
for connecting a 1607A logic analyzer. I presume these work when the yellow
"STATE DSPL" button is depressed? Does anyone know what voltage levels are
required to drive these inputs? I have no data on the 'scope ...

Thanks,
Andrew.

But a 1740A *has* x-y mode. It's just called A-vs-B.

John

 

[Andrew Holme]

John Larkin wrote:

On Fri, 24 Dec 2004 14:04:48 -0000, "Andrew Holme" <andrew@nospam.com
wrote:

I would like to build the Lorenz Attractor circuit
http://frank.harvard.edu/~paulh/misc/lorenz.htm mentioned in the
recent "Neato chaotic equations for analog computers" thread, but my
HP1740A 'scope has no external-X horizontal input.

On the back of the 1740A are 3 BNC sockets labelled HORIZ, VERT and
Z-AXIS for connecting a 1607A logic analyzer. I presume these work
when the yellow "STATE DSPL" button is depressed? Does anyone know
what voltage levels are required to drive these inputs? I have no
data on the 'scope ...

Thanks,
Andrew.


But a 1740A *has* x-y mode. It's just called A-vs-B.

John

OK, thanks. I see now. I've just done a Google image search for 1740A and
found this:
http://www.sphere.bc.ca/test/hp-equipment/hp-1740a.jpg

My 1740A has a yellow "STATE DSPL" button where the A-vs-B button should be!
There's a yellow stick-on label around the button covering up the original
legend. Looks like some sort of option. Bummer. Anyone know how to
re-enable the A-vs-B functionality?

 

[Andrew Holme]

Andrew Holme wrote:

John Larkin wrote:
On Fri, 24 Dec 2004 14:04:48 -0000, "Andrew Holme"
andrew@nospam.com> wrote:

I would like to build the Lorenz Attractor circuit
http://frank.harvard.edu/~paulh/misc/lorenz.htm mentioned in the
recent "Neato chaotic equations for analog computers" thread, but my
HP1740A 'scope has no external-X horizontal input.

On the back of the 1740A are 3 BNC sockets labelled HORIZ, VERT and
Z-AXIS for connecting a 1607A logic analyzer. I presume these work
when the yellow "STATE DSPL" button is depressed? Does anyone know
what voltage levels are required to drive these inputs? I have no
data on the 'scope ...

Thanks,
Andrew.


But a 1740A *has* x-y mode. It's just called A-vs-B.

John

OK, thanks. I see now. I've just done a Google image search for
1740A and found this:
http://www.sphere.bc.ca/test/hp-equipment/hp-1740a.jpg

My 1740A has a yellow "STATE DSPL" button where the A-vs-B button
should be! There's a yellow stick-on label around the button covering
up the original legend. Looks like some sort of option. Bummer.
Anyone know how to re-enable the A-vs-B functionality?

It's possible my 1740A has option 101 which is described as "Optimum
performance with the 1607A Logic State Analyzer to provide both digital
logical state and analog electrical analysis." Any info on how to roll back
this option would be appreciated.