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I have two 3455A DVM.

They both have the same front panel layout but the color of the panels
are different.

The newer one is the standard two-tone face we see everywhere.

However the older one from the 1970's has a black face.

Is this a particularly rare version of the 3455A or just standard for
that era?


Many thanks,
Mark
VK2HMC

1a. GPIB comms with 8753C
Posted by: "sadavis80" Steve@... sadavis80
Date: Thu Jan 25, 2007 6:07 am ((PST))

I have been using a USB-GPIB-A adapter to talk to my 8753C and
continue to have trouble sending and reading information without
errors. Has anyone else used GPIB to communicate with an 8753?

I have finally found what should be sufficient documentation, but it
just doesn't want to work the way the book says. The OPC commands
"seem" to work the way they should - I get the '1' response, however,
often times the following command will generate an error and will not
be recognized. On reads using a command like
POIN 201; CHAN1; FORM4; SING; OUTPFORM;
(copied from an example program from HP)
I almost always get the first point response, but the rest often do
not come and I get a timeout error. If I put the entire sequence in a
loop (loops back on timeout error), then it will read correctly some
times and some times it will fail. I have tried MANY MANY different
delays between the sequential reads and have finally gotten it to work
fairly reliably, but acquiring the data takes considerably longer than
it should (due to the required delays).

Yesterday, I thought I realized that the 'CHAN1;' part of the above
was causing problems so I separated the command and now send
POIN 201; CHAN1; FORM4;
as a separate command before the point loop (CHAN1 is OPC'able, but it
doesn't seem to matter). Then a short delay and then
SING; OUTPFORM;
before entering the read data loop. It seems to work a little more
reliably, but I still have to have more delay than should be necessary
between read requests (ibrd). I also determined that if I read the
first 10 points or so slower and "get it going" (so to speak), I can
then drop the delays altogether and read the subsequent points without
error (MOST of the time).

This all just seems WEIRD to me - I wonder if my 8753 has a problem or
is it just characteristic of that model. I'm using a fairly fast
computer (1.5 - 2 GHZ Intel PC with WinXP), but the docs say the GPIB
drivers should 'get' the data when the 8753 is ready to send it - but
it doesn't work that way exactly. Apparently, I can make the ibrd
request before the 8753 can recognize it and it hoses the works. I
wonder if the older GPIB drivers and the older 8753 just weren't
designed to work with these new much faster computers?

Anyone have info, thoughts or ideas?
tia,
Steve

--- Robert Hagenbach <rc_hagenbach@...> wrote:

Would anyone be interested in HP test equipment that needs repair?
Power meters, AC voltmeters, RF signal generators et-cetera.

I would be; I get most of my gear that way.
(I buy off eBay...)

/b



____________________________________________________________________________________

-----Original Message-----
From: TekScopArc@...
[mailto:TekScopArc@...] On Behalf Of Tomas Larsson
Sent: Sunday, January 14, 2007 11:47 PM
To: TekScopes@...;
hp_agilent_equipment@...;
Manual_Exchange@...; TekScopArc@...;
FEDPIC Grupp; naktalk@...
Subject: [TekScopArc] New Website [WAS] [TekScopes] Tektronix
468 manuals - I got 'em

Hi all Members in all Groups.

Since BAMA is scaling down, I have decided to take over from
where BAMA ended.
I have created a new domain, called www.ebaman.com,
(Electronic Boat Anchor Archives for MANuals) it will however
take a day or two for the DNS-update.
I will start to build the website at the end of this week.
After that, when it goes online, It will be ready.

I would however be very happy for Ideas and such.

With best regards

Tomas Larsson
Sweden


for downloads etc.
Use the free www.yousendit.com service for uploading.
Excellent and cheap hosting, use

Verus Amicus Est Tamquam Alter Idem

-----Original Message-----
From: TekScopes@...
[mailto:TekScopes@...] On Behalf Of Stefan Trethan
Sent: Sunday, January 14, 2007 9:34 PM
To: TekScopes@...
Subject: Re: [TekScopes] Tektronix 468 manuals - I got 'em

At least one member keeps a server with manuals, i think the right
persons will reply.
You could also try <>

Now that BAMA does no longer take TEK stuff, i think we should
actively do something in that regard.
There should be a list of sorts, or a table, with all free digital
manuals that we know of, and listing locations where they are.
We only need one "download" place, but we should have

several people

have a copy locally. It should take little effort to keep a

few CDs or

DVDs with manuals, just in case one of those download

places is lost,

and by distributing them there should always be many people

with the

same copy, if someone is unreachable for some reason.

I made a database in the database section, to show what i

am talking

about <>

I think there may be other ways to do this, but that's the general
idea.
Over time manuals will surely be distributed over many servers,
especially now with BAMA. I believe instead of attempting

to set up a

central archive that has all it would work better to have the files
distributed, as long as there is some index somewhere to

find them and

backup copies in case one server is lost.

What do you think?

ST



On Sun, 14 Jan 2007 20:14:41 +0100, anon_tx <anon_tx@...>
wrote:

The moderator's email is 'hidden' so I am unable to ask

him/her off-

list so I will put it to you...

There are two parts: one 27MBy and the other 39MBy. I used

hjsplit to

split them into 1.4MBy chunks but think that is probably

too much to

upload to the files section in this group - split or not.

It will

probably consume (or exceed) the remainder of my upload

quota - or for

that matter maybe this entire group.

So, I was in turn thinking about posting the manuals to

usenet in the

technical books section. Anybody have any thoughts on what

the 'smart'

thing to do is or what you'd like to see? I have been

looking for

these things a long time (for free) and finally broke down

and bought

them and am willing to share now that I have them.

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