[volt-nuts] GPIB Issue with 3458A

[Todd Micallef]

Randy,

I am the person that wrote that EzGPIB script. It was my first before I
moved on to Python and I have only written a couple for the different
meters I have on hand. Version 1.01 is the most current version I have for
the 3458A.
I see that I should have added at least one more command to the meter
initialization.  The additional init command is used in the scripts on
xDevs.

Add the following line in the Init_Device procedure
   EZGPIB_BusWriteData(gpib_address,'END ALWAYS');

This tells the meter to send an EOI on every read.

I am looking for one of my Prologix adapters or I would test this. When I
find it, I will also test it. I want to make sure there are no further
issues.
Also, do both meters run the same firmware versions? I wonder if the HP
meter is using a much older version.

Todd

On Sat, Dec 30, 2017 at 10:42 AM, Randy Evans <randyevans2688 at gmail.com>
wrote:

> Todd,
>
> I have version 1.01. Yes, please e-mail me your modified version.  Maybe it
> will help.
>
> Thanks,
>
> Randy
>
> On Sat, Dec 30, 2017 at 4:24 AM, Todd Micallef <tmicallef at gmail.com>
> wrote:
>
> > Randy,
> >
> > Is there a version number at the top of the file? I had two versions
> (1.00
> > and 1.01). I can't remember all that changed between the two since it has
> > been a while but I did find an additional timeout code that limited the
> > wait time for reading data to 1 minute. I am guessing I had a problem
> with
> > mine and added it.
> >
> > I can email it to you if you want to try it. If it works for you, I will
> > have Illya update it on xDevs.
> >
> > Todd
> >
> > On Sat, Dec 30, 2017 at 12:39 AM, Randy Evans <randyevans2688 at gmail.com>
> > wrote:
> >
> > > I am still unable to get my HP-3458A to work with the xdevs program
> > > "HP3458A_Measure_DMM_Noise.488" (https://xdevs.com/article/dmm_noise/
> ).
> > > It
> > > works fine with my Agilent 3458A and with a friend's HP-3458A and his
> > > Agilent 3458A using the EZGPIB program.  The SW versions are identical
> > with
> > > my friend's DMMs, the HP units are (8.2) and with the Agilent units are
> > > (9.2).  However, both of my units work fine with the KE5FX GPIB Toolkit
> > > HP3458.EXE program to download the NVRAM CAL data.  This would seem to
> > > indicate that my HP-3458 GPIB works at least partially.
> > >
> > > Does anyone have a EZGPIB program that I could try to run (that is
> > > different from the Xdev program)?  It would be nice to see if I could
> get
> > > something to work other than the HP3458.EXE program.  Or if any one has
> > > some ideas on what to look for.
> > >
> > > Thanks,
> > >
> > > Randy Evans
> > >
> > > On Tue, Dec 26, 2017 at 7:24 PM, Randy Evans <randyevans2688 at gmail.com
> >
> > > wrote:
> > >
> > > > I am hoping some of you experts might be able to assist with a
> strange
> > > > problem i am having trying to make automated measurements using
> EZGPIB
> > > with
> > > > an Agilent and an HP 3458A.  I have a program given to me by Martin
> > > > Reynolds, which is a variant on the Xdevs noise measurement program.
> > > > Martin's program continuously reads the voltage measurements
> > sequentially
> > > > from the two meters and then stores then in a measurements file,
> along
> > > with
> > > > the temperature measurements from both meters.  The program works
> fine
> > on
> > > > his Agilent and HP 3458As.
> > > >
> > > > On my two 3458As, it takes the temperature measurements just fine but
> > > only
> > > > takes a voltage measurement from the Agilent unit.  The HP unit will
> > not
> > > > make any voltage measurements although I can see both the 3458As in
> > talk
> > > > states and, of course, it does sent the temperature measurements.
> > > However,
> > > > if I turn the HP unit off and then on again, the HP will start to
> take
> > > > voltage and temperature measurements and send them to the PC.
> > > >
> > > > Any ideas on what might be causing the strange behavior?
> > > >
> > > > Thanks,
> > > >
> > > > Randy Evans
> > > >
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