AnsweredAssumed Answered

8756A Programming Commands

Question asked by tdllc01 on Jun 20, 2001
Hello Rod,

The 8756A is circa 1983.  This was close to the end of the "R2D2" instrument
programming era, and the 8756A contains  two-letter "R2D2"
commands, much like the 3455A voltmeter.

So, discard any attempts to use "SCPI", because it will only clog the tiny
input
buffer in the 8756A.   You'll need direct I/O, and do set up the read and
write
terminators.  You may need delays between write and read operations.  This
instrument likes to see c/r and l/f on commands that it receives.

Commands:
SCd   where d is between 0 and 400.  Places cursor at horizontal position d.
          It's up to you to to figure out what that frequency might be.
That should
          be available from the sweeper connected to the 8756A, along with
some
          number-crunching.

CX    Cursor to maximum

CN    Cursor to minimum

CU0  Cursor OFF

CU1  Cursor ON

CD0  Cursor Delta OFF

CD1  Cursor Delta ON

MR   Cursor (or marker) to Reference Line

OC    output cursor or cursor delta amplitude  and horizontal position.
Format
set by FD command.

FD0   [+DD.DDD][,][DDD]lf  <---  The "lf" is a line-feed.  You must receive
this character.
FD1   [BB][DDD][EOI]           <---  "EOI" is the IEEE-488 End Or Identify
(no line-feed here)
                                                          B means an 8-bit
byte, D means ASCII Digit.

OV   output current measurement value; usually for CW measurements.  Format
(FDm)
        must be set and NonSwept mode SW0 must be set.
FD0   [+DD.DDD]lf
FD1   [BB][EOI]

I have other commands for the 8756A, if you are interested.  It's been a
very long time since
I programmed that unit, and I used the 9845 and 9826 desktop for that
task...

George Tyrrell
TestDynamics LLC
tdllc01@earthlink.net




----- Original Message -----
From: "Rod" <rod@premierdevices.com>
To: <vrf@lvld.agilent.com>
Sent: Wednesday, June 20, 2001 4:13 PM
Subject: Re: vrf Stop button


> Hello,
>
> We are using an old HP8756A Scalar Analyzer to take some data. I am trying
> to set the cursor on a specific frequency and read data from it. Does
anyone
> know what command line to use? I've tried several: ":MEAS:CRSR:AMPL?"
> ,":MEAS:CURS:AMPL?"  etc.
>
> Is anyone out there old enough to know how to help me?
>
> Thanks a lot,
>
> Rod
>
>
>
> ----- Original Message -----
> From: "Stan Bischof (Richard S)" <rsb@soco.agilent.com>
> To: <lee.hudson@lumileds.com>
> Cc: <vrf@lvld.agilent.com>
> Sent: Wednesday, June 20, 2001 1:38 PM
> Subject: Re: vrf Stop button
>
>
> > "HUDSON,LEE (Non-A-LumiLEDs,ex1)" <lee.hudson@lumileds.com> wrote:
> > > Hi All,
> > >
> > > In a lot of my VEE programs I have an "Abort Test" or "Stop" button
that
> > > stops the program and resets instruments.  However, if someone decides
> to
> > > kill the program using the "Stop" button on the tool bar of VEE none
of
> the
> > > instruments get reset and problems occur.  Is there a way to have the
> > > program reset instruments when this button is pressed?
> > >
> > > Related to this problem is there a way to get rid of the tool bar of
VEE
> in
> > > the panel mode and force the operator to use a "Start" and "Stop"
button
> > > from the panel view?  This would be an acceptable work-around to the
> above
> > > mentioned problem.
> >
> > for the latter, one option is to use vee runtime and
> >
> > veerun -disallowclose myfile.vxe
> >
> > then user can't even use the Windows controls ("X") to close the app
> > but must go through your interface. And there is no "Stop" button to
> press.
> >
> > Stan
> >
> >
>
> --------------------------------------------------------------------------
> > Stan Bischof  Agilent Technologies  707-577-3994
stan_bischof@agilent.com
>
> --------------------------------------------------------------------------
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> >
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