|
The 3456A is a very nice meter, and I think the only of its sort HP ever certified as a transfer standard. There are a couple of failures you should watch for. First, the more desirable is the meter without the fan, if you have a fan, it is a much older model, and I don't know much about those. DO NOT TOUCH ANY OF THE BOARDS WITH YOUR BARE FINGERS! DO NOT TRY TO CLEAN PCBs, UNLESS YOU WANT TO SPEND HOURS SCRUBBING WITH PURE 99% IPA. and even then, you may fail. The large axial leaded filter capacitors tend to dry out, and may need replacing. Check them with an ESR meter. When they go bad, the meter will count erratically. These are very high impedance meters. They will drift when open circuit, in all but the highest DCV range. The big reed relay that routes the ohms current tends to get its contacts coated with something that makes it unreliable. I usually remove a coil wire, and put a wetting current through the contacts, and buzz them by applying 25Hz, or so to the coil. I put a volt meter across the contacts (mechanical, not dvm) and when the needle gets to 50% of the wetting voltage, you are done. 10ma, with a series resistor is a good wetting current. The front panel push switch that switches between front and rear panel input is known to never work again, if you ever push it. It is bound to need cleaning with some deoxit. The trim pots that are for calibration are under the input connector front panel, and are wire wound, and get dirty. If you find you need to adjust them, get some deoxit slider lube into them first. The AC is calibrated for 1KHz, not 50/60Hz. There is a serious noise problem at or near 50/60 hz, so that if you put, say, 61Hz input in 60Hz land, your lower digits will count up and down with the beat note. If you ever find a way to fix that, please let us know! Enjoy your new meters! -Chuck Harris On Fri, 04 Apr 2025 10:57:54 -0700 "BobH via groups.io" <wanderingmetalhead@...> wrote: I picked up the meters today. They are model 3456A. Both work, but
need some cleanup. The power switch on on unit sticks on and the
front/rear terminal switch is dirty. A quick checkout shows both
reading within a few mV of my 34401A. Now I need to port my GPIB
tools to talk to them.
|
I picked up the meters today. They are model 3456A. Both work, but need some cleanup. The power switch on on unit sticks on and the front/rear terminal switch is dirty. A quick checkout shows both reading within a few mV of my 34401A. Now I need to port my GPIB tools to talk to them.
?
|
I am not certain it is a 3456B. I got that number from a phone conversation from someone selling a pair of these meters, and a recollection from seeing said meters at a hamfest last year. I will be getting them soon, and will update when I have them in front of me.
?
BobH
?
|
FWIW, I can't put my hands on my '94 catalog at the moment, but the 3456A is no longer in the '95 one - it has the 3457A & 3458A. -Pat
?
> ------ Original Message ------
> From: kc0wjn@...
> To: [email protected]
> Sent: Thursday, April 3rd 2025, 11:18 AM
> Subject: Re: [HP-Agilent-Keysight-equipment] Manuals for an HP3456B DMM?
? And your attempt worked. Thanks.
? ?
?
Dave Daniel suggested that he maybe should scan and make
a pdf out of his HP3456<<<A>>> manual.? I was trying to head
that off.
I looked in the following catalogs:
1986 - 3456A
1987 - 3456A
1988 - 3456A
1989 - 3456A
1990 - 3456A
1991 - 3456A
1992 - 3456A
1993 - 3456A
...
1997 - no 3456 model number in catalog
...
1999 - no 3456 model number in catalog
2000 -?
So, if the "B" model exists, it would be in 1994, 1995, or 1996.
The 3458A was the only meter in the 34XX series in 1999.
Searching for HP3456B results in a couple of ChatGPT created
results that don't actually contain 3456"B".
Although the OP hasn't chimed in, I would bet he made a mistake.
I am pretty certain that no 3456B ever existed as a DVM.
-Chuck Harris
On Thu, 3 Apr 2025 05:20:16 -0700 "Radu Bogdan Dicher via "
<vondicher=[email protected]> wrote:
> I've never heard of a 3456B. I don't think there is one. It'd be very
> interesting to learn if that's not so.
>?
> Radu.
>?
> On Thu, Apr 3, 2025, 3:43 AM Chuck Harris via <cfharris=
> [email protected]> wrote:
>?
> > Nice copies of the various HP3456A manuals are available
> > on Ko4bb.com
> >
> > -Chuck Harris
> >
> >
> > On Wed, 2 Apr 2025 23:37:26 -0400 "Dave Daniel via "
> > <kc0wjn=[email protected]> wrote:
> > > Yes. There was a time when a 3458A was on my list of expensive
> > > instruments to acquire for my lab, but I ended up with the 3456A
> > > as an interim solution and it has fulfilled my needs. I wish I
> > > could find a replacement for the small aluminum panel on the RH
> > > side on which the binding posts are mounted because mine is badly
> > > and deeply scratched, but tha's a nit.
> > >
> > > It sounds as if i should scan my 3456A manual and upload a copy of
> > > the PDF to the HP Wiki. I an in the process of scanning a
> > > Tektronix 7934 manual (the foldouts are tedious to properly
> > > scan), so the 3456A manual scan would be queued behind that.
> > >
> > > Everyone should own an HP 345xA, a Fluke 27 and af least one
> > > Simpson 260, lol.
> > >
> > > DaveD
> > > KC0WJN
> > >
> > >
> > > On Wed, Apr 2, 2025 at 22:54 Dave McGuire via <mcguire=
> > > [email protected]> wrote:
> > >
> > > > On 4/2/25 22:48, Dave Daniel via wrote:
> > > > > They made 3455s, 3456s, 3457s and 3458s. I think but am not
> > > > > sure that these were all "A" models, i.e., 3456A. My
> > > > > understanding is that the 3458A is the (or one of) gold
> > > > > standard(s).
> > > >
> > > >? ? The 3458A is indeed the gold standard, and one of the few
> > > > instruments to be made with all three names on the front.
> > > >
> > > > > I own a 3456A.
> > > >
> > > >? ? They are great meters, even (especially?) by today's
> > > > standards.
> > > >
> > > >? ? ? ? ? ? ? ?-Dave
> > > >
> > > > --
> > > > Dave McGuire, AK4HZ
> > > > New Kensington, PA
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> > >
> > >
> > >
> >
> >
> >
> >?
> >
> >
> >
>?
>?
>?
>?
>?
?
|
And your attempt worked. Thanks.
Dave Daniel suggested that he maybe should scan and make
a pdf out of his HP3456<<<A>>> manual.? I was trying to head
that off.
I looked in the following catalogs:
1986 - 3456A
1987 - 3456A
1988 - 3456A
1989 - 3456A
1990 - 3456A
1991 - 3456A
1992 - 3456A
1993 - 3456A
...
1997 - no 3456 model number in catalog
...
1999 - no 3456 model number in catalog
2000 -
So, if the "B" model exists, it would be in 1994, 1995, or 1996.
The 3458A was the only meter in the 34XX series in 1999.
Searching for HP3456B results in a couple of ChatGPT created
results that don't actually contain 3456"B".
Although the OP hasn't chimed in, I would bet he made a mistake.
I am pretty certain that no 3456B ever existed as a DVM.
-Chuck Harris
On Thu, 3 Apr 2025 05:20:16 -0700 "Radu Bogdan Dicher via "
<vondicher=[email protected]> wrote:
> I've never heard of a 3456B. I don't think there is one. It'd be very
> interesting to learn if that's not so.
>
> Radu.
>
> On Thu, Apr 3, 2025, 3:43 AM Chuck Harris via <cfharris=
> [email protected]> wrote:
>
> > Nice copies of the various HP3456A manuals are available
> > on Ko4bb.com
> >
> > -Chuck Harris
> >
> >
> > On Wed, 2 Apr 2025 23:37:26 -0400 "Dave Daniel via "
> > <kc0wjn=[email protected]> wrote:
> > > Yes. There was a time when a 3458A was on my list of expensive
> > > instruments to acquire for my lab, but I ended up with the 3456A
> > > as an interim solution and it has fulfilled my needs. I wish I
> > > could find a replacement for the small aluminum panel on the RH
> > > side on which the binding posts are mounted because mine is badly
> > > and deeply scratched, but tha's a nit.
> > >
> > > It sounds as if i should scan my 3456A manual and upload a copy of
> > > the PDF to the HP Wiki. I an in the process of scanning a
> > > Tektronix 7934 manual (the foldouts are tedious to properly
> > > scan), so the 3456A manual scan would be queued behind that.
> > >
> > > Everyone should own an HP 345xA, a Fluke 27 and af least one
> > > Simpson 260, lol.
> > >
> > > DaveD
> > > KC0WJN
> > >
> > >
> > > On Wed, Apr 2, 2025 at 22:54 Dave McGuire via <mcguire=
> > > [email protected]> wrote:
> > >
> > > > On 4/2/25 22:48, Dave Daniel via wrote:
> > > > > They made 3455s, 3456s, 3457s and 3458s. I think but am not
> > > > > sure that these were all "A" models, i.e., 3456A. My
> > > > > understanding is that the 3458A is the (or one of) gold
> > > > > standard(s).
> > > >
> > > >? ? The 3458A is indeed the gold standard, and one of the few
> > > > instruments to be made with all three names on the front.
> > > >
> > > > > I own a 3456A.
> > > >
> > > >? ? They are great meters, even (especially?) by today's
> > > > standards.
> > > >
> > > >? ? ? ? ? ? ? ?-Dave
> > > >
> > > > --
> > > > Dave McGuire, AK4HZ
> > > > New Kensington, PA
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> > >
> > >
> > >
> >
> >
> >
> >
> >
> >
> >
>
>
>
>
>
|
Yes, after I posted I looked around and found several good-quality copies. I did that backwards!
Nice copies of the various HP3456A manuals are available
on Ko4bb.com
-Chuck Harris
On Wed, 2 Apr 2025 23:37:26 -0400 "Dave Daniel via "
<kc0wjn=[email protected]> wrote:
> Yes. There was a time when a 3458A was on my list of expensive
> instruments to acquire for my lab, but I ended up with the 3456A as
> an interim solution and it has fulfilled my needs. I wish I could
> find a replacement for the small aluminum panel on the RH side on
> which the binding posts are mounted because mine is badly and deeply
> scratched, but tha's a nit.
>
> It sounds as if i should scan my 3456A manual and upload a copy of
> the PDF to the HP Wiki. I an in the process of scanning a Tektronix
> 7934 manual (the foldouts are tedious to properly scan), so the 3456A
> manual scan would be queued behind that.
>
> Everyone should own an HP 345xA, a Fluke 27 and af least one Simpson
> 260, lol.
>
> DaveD
> KC0WJN
>
>
> On Wed, Apr 2, 2025 at 22:54 Dave McGuire via <mcguire=
> [email protected]> wrote:
>
> > On 4/2/25 22:48, Dave Daniel via wrote:
> > > They made 3455s, 3456s, 3457s and 3458s. I think but am not sure
> > > that these were all "A" models, i.e., 3456A. My understanding is
> > > that the 3458A is the (or one of) gold standard(s).
> >
> >? ? The 3458A is indeed the gold standard, and one of the few
> > instruments to be made with all three names on the front.
> >
> > > I own a 3456A.
> >
> >? ? They are great meters, even (especially?) by today's standards.
> >
> >? ? ? ? ? ? ? ?-Dave
> >
> > --
> > Dave McGuire, AK4HZ
> > New Kensington, PA
> >
> >
> >
> >
> >
> >
>
>
>
>
>
|
Dave Daniel suggested that he maybe should scan and make a pdf out of his HP3456<<<A>>> manual. I was trying to head that off. I looked in the following catalogs: 1986 - 3456A 1987 - 3456A 1988 - 3456A 1989 - 3456A 1990 - 3456A 1991 - 3456A 1992 - 3456A 1993 - 3456A ... 1997 - no 3456 model number in catalog ... 1999 - no 3456 model number in catalog 2000 - So, if the "B" model exists, it would be in 1994, 1995, or 1996. The 3458A was the only meter in the 34XX series in 1999. Searching for HP3456B results in a couple of ChatGPT created results that don't actually contain 3456"B". Although the OP hasn't chimed in, I would bet he made a mistake. I am pretty certain that no 3456B ever existed as a DVM. -Chuck Harris On Thu, 3 Apr 2025 05:20:16 -0700 "Radu Bogdan Dicher via groups.io" <vondicher@...> wrote: I've never heard of a 3456B. I don't think there is one. It'd be very
interesting to learn if that's not so.
Radu.
On Thu, Apr 3, 2025, 3:43 AM Chuck Harris via groups.io <cfharris=
[email protected]> wrote:
Nice copies of the various HP3456A manuals are available
on Ko4bb.com
-Chuck Harris
On Wed, 2 Apr 2025 23:37:26 -0400 "Dave Daniel via groups.io"
<kc0wjn@...> wrote:
Yes. There was a time when a 3458A was on my list of expensive
instruments to acquire for my lab, but I ended up with the 3456A
as an interim solution and it has fulfilled my needs. I wish I
could find a replacement for the small aluminum panel on the RH
side on which the binding posts are mounted because mine is badly
and deeply scratched, but tha's a nit.
It sounds as if i should scan my 3456A manual and upload a copy of
the PDF to the HP Wiki. I an in the process of scanning a
Tektronix 7934 manual (the foldouts are tedious to properly
scan), so the 3456A manual scan would be queued behind that.
Everyone should own an HP 345xA, a Fluke 27 and af least one
Simpson 260, lol.
DaveD
KC0WJN
On Wed, Apr 2, 2025 at 22:54 Dave McGuire via groups.io <mcguire=
[email protected]> wrote:
On 4/2/25 22:48, Dave Daniel via groups.io wrote:
They made 3455s, 3456s, 3457s and 3458s. I think but am not
sure that these were all "A" models, i.e., 3456A. My
understanding is that the 3458A is the (or one of) gold
standard(s). The 3458A is indeed the gold standard, and one of the few
instruments to be made with all three names on the front.
I own a 3456A. They are great meters, even (especially?) by today's
standards.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
|
I've never heard of a 3456B. I don't think there is one. It'd be very interesting to learn if that's not so.
Radu.
Nice copies of the various HP3456A manuals are available
on Ko4bb.com
-Chuck Harris
On Wed, 2 Apr 2025 23:37:26 -0400 "Dave Daniel via "
<kc0wjn=[email protected]> wrote:
> Yes. There was a time when a 3458A was on my list of expensive
> instruments to acquire for my lab, but I ended up with the 3456A as
> an interim solution and it has fulfilled my needs. I wish I could
> find a replacement for the small aluminum panel on the RH side on
> which the binding posts are mounted because mine is badly and deeply
> scratched, but tha's a nit.
>
> It sounds as if i should scan my 3456A manual and upload a copy of
> the PDF to the HP Wiki. I an in the process of scanning a Tektronix
> 7934 manual (the foldouts are tedious to properly scan), so the 3456A
> manual scan would be queued behind that.
>
> Everyone should own an HP 345xA, a Fluke 27 and af least one Simpson
> 260, lol.
>
> DaveD
> KC0WJN
>
>
> On Wed, Apr 2, 2025 at 22:54 Dave McGuire via <mcguire=
> [email protected]> wrote:
>
> > On 4/2/25 22:48, Dave Daniel via wrote:
> > > They made 3455s, 3456s, 3457s and 3458s. I think but am not sure
> > > that these were all "A" models, i.e., 3456A. My understanding is
> > > that the 3458A is the (or one of) gold standard(s).
> >
> >? ? The 3458A is indeed the gold standard, and one of the few
> > instruments to be made with all three names on the front.
> >
> > > I own a 3456A.
> >
> >? ? They are great meters, even (especially?) by today's standards.
> >
> >? ? ? ? ? ? ? ?-Dave
> >
> > --
> > Dave McGuire, AK4HZ
> > New Kensington, PA
> >
> >
> >
> >
> >
> >
>
>
>
>
>
|
Nice copies of the various HP3456A manuals are available on Ko4bb.com -Chuck Harris On Wed, 2 Apr 2025 23:37:26 -0400 "Dave Daniel via groups.io" <kc0wjn@...> wrote: Yes. There was a time when a 3458A was on my list of expensive
instruments to acquire for my lab, but I ended up with the 3456A as
an interim solution and it has fulfilled my needs. I wish I could
find a replacement for the small aluminum panel on the RH side on
which the binding posts are mounted because mine is badly and deeply
scratched, but tha's a nit.
It sounds as if i should scan my 3456A manual and upload a copy of
the PDF to the HP Wiki. I an in the process of scanning a Tektronix
7934 manual (the foldouts are tedious to properly scan), so the 3456A
manual scan would be queued behind that.
Everyone should own an HP 345xA, a Fluke 27 and af least one Simpson
260, lol.
DaveD
KC0WJN
On Wed, Apr 2, 2025 at 22:54 Dave McGuire via groups.io <mcguire=
[email protected]> wrote:
On 4/2/25 22:48, Dave Daniel via groups.io wrote:
They made 3455s, 3456s, 3457s and 3458s. I think but am not sure
that these were all "A" models, i.e., 3456A. My understanding is
that the 3458A is the (or one of) gold standard(s). The 3458A is indeed the gold standard, and one of the few
instruments to be made with all three names on the front.
I own a 3456A. They are great meters, even (especially?) by today's standards.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
|
Yes. There was a time when a 3458A was on my list of expensive instruments to acquire for my lab, but I ended up with the 3456A as an interim solution and it has fulfilled my needs. I wish I could find a replacement for the small aluminum panel on the RH side on which the binding posts are mounted because mine is badly and deeply scratched, but tha's a nit.
It sounds as if i should scan my 3456A manual and upload a copy of the PDF to the HP Wiki. I an in the process of scanning a Tektronix 7934 manual (the foldouts are tedious to properly scan), so the 3456A manual scan would be queued behind that.?
Everyone should own an HP 345xA, a Fluke 27 and af least one Simpson 260, lol.
On 4/2/25 22:48, Dave Daniel via wrote:
> They made 3455s, 3456s, 3457s and 3458s. I think but am not sure that
> these were all "A" models, i.e., 3456A. My understanding is that the
> 3458A is the (or one of) gold standard(s).
? ?The 3458A is indeed the gold standard, and one of the few instruments
to be made with all three names on the front.
> I own a 3456A.
? ?They are great meters, even (especially?) by today's standards.
? ? ? ? ? ? ? -Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
|
On 4/2/25 22:48, Dave Daniel via groups.io wrote: They made 3455s, 3456s, 3457s and 3458s. I think but am not sure that these were all "A" models, i.e., 3456A. My understanding is that the 3458A is the (or one of) gold standard(s). The 3458A is indeed the gold standard, and one of the few instruments to be made with all three names on the front. I own a 3456A. They are great meters, even (especially?) by today's standards. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
|
They made 3455s, 3456s, 3457s and 3458s. I think but am not sure that these were all "A" models, i.e., 3456A. My understanding is that the 3458A is the (or one of) gold standard(s).
I had no idea they made a 3456B. Are you sure it isn’t a 3465B?
|
I had no idea they made a 3456B. Are you sure it isn’t a 3465B?
|
Does anybody know where I can find manuals for an HP3456B DMM?
The HP site has a manual for the 3456A, how different is the 3456B from the 3456A?
?
Thanks,
BobH
|
Cubdriver
Dave McGuire
Steve Byan