Forums :: Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives
Support This Site: Contributors :: Advertise


It is currently Feb Wed 26, 2020 3:00 am


All times are UTC [ DST ]





Post New Topic Post Reply  [ 13 posts ] 
Author Message
 Post subject: HP3490A bench multimeter
PostPosted: Sep Sun 22, 2019 6:03 am 
Member
User avatar

Joined: Mar Mon 17, 2008 5:05 am
Posts: 5842
Location: Ashhurst, New Zealand
Hi all - there's currently an HP3490A bench multimeter on our local auction website for NZ$200, say US$150, opening bid - it looks to be in good condition with the big operators manual. It doesn't appear to be connected to anything but the display says "12. 0000" and it's set to "Auto" and "Ohms". Is it worth a gamble? I have asked if there's any cal label but no answer yet.TIA.

https://www.trademe.co.nz/electronics-p ... 2df23c-005

_________________
Cheers - Martin ZL2MC


Top
 Profile  
 
 Post subject: Re: HP3490A bench multimeter
PostPosted: Sep Sun 22, 2019 11:40 am 
Member
User avatar

Joined: Jan Tue 31, 2012 1:55 am
Posts: 11445
Location: Mountains of Mourne. Ireland.
Don't you mean 12000.3

How on earth are you going to get that 20lb monster past the wife?
Image
https://www.youtube.com/watch?v=ZPr3CsSHJuY

Boys and their toys... :)
Greg.


Top
 Profile  
 
 Post subject: Re: HP3490A bench multimeter
PostPosted: Sep Sun 22, 2019 12:53 pm 
Member
User avatar

Joined: Oct Sun 15, 2006 12:57 pm
Posts: 6956
Location: Liberty, Missouri
I "NEED" one of those, that is beautiful.

_________________
Pics, Bold & underlined text, are usually links.

https://mikeharrison.smugmug.com/

Mike


Top
 Profile  
 
 Post subject: Re: HP3490A bench multimeter
PostPosted: Sep Sun 22, 2019 1:15 pm 
Member

Joined: Jun Fri 19, 2009 6:34 pm
Posts: 9214
Location: Long Island NY
What do you want it for? Do you really need a 6-digit bench DMM? Given its age, it probably isn't going to give you six digits worth of accuracy. Even if it was calibrated recently, it probably would not hold very long. That's the usual reason labs get rid of instruments like this. If you really need six digit accuracy, a new(er) meter should be considered.

As a collectible, it's not necessary to rationalize; if you want it, and it's not going to put you out money-wise or family-wise, go for it. It looks to be in excellent condition and the seller appears to be quite reasonable about picking it up in person and knowledgeable about its condition. The manual is worth something too if you are going to own the meter.

_________________
"Hell, there are no rules here--we're trying to accomplish something!"

Thomas A. Edison


Top
 Profile  
 
 Post subject: Re: HP3490A bench multimeter
PostPosted: Sep Sun 22, 2019 1:59 pm 
Member
User avatar

Joined: Jan Tue 31, 2012 1:55 am
Posts: 11445
Location: Mountains of Mourne. Ireland.
The HP 3490A, 
A Five-Digit Multimeter, That Can Test Itself !
Halfway down page. http://hpmemoryproject.org/wb_pages/wall_b_page_14b.htm

Greg.


Top
 Profile  
 
 Post subject: Re: HP3490A bench multimeter
PostPosted: Sep Mon 23, 2019 8:56 pm 
Member
User avatar

Joined: Oct Thu 18, 2007 11:34 am
Posts: 4231
Location: Port Orchard, Wa 98366
Make sure you ask if you have the option to return with in a 30-day return.
HP Makes several quality Products. So as it shows to be functioning as demonstrated and it doesn't show any damage, I would take it in a heartbeat if I didn't have my Flukes and HP's. Very nice on the buttons and switch, ask if it has an internal functioning pass test that shows no errors in a photo.
Best of luck, Looks good to me.

_________________
Visit our site:
http://antique-radio-lab.forumotion.com/
I was smokinradios Long time ago (2004)


Top
 Profile  
 
 Post subject: Re: HP3490A bench multimeter
PostPosted: Sep Mon 23, 2019 9:42 pm 
Member
User avatar

Joined: Mar Mon 17, 2008 5:05 am
Posts: 5842
Location: Ashhurst, New Zealand
Chris108 said wrote:
What do you want it for? Do you really need a 6-digit bench DMM?


Agreed. After a large mug of coffee and a comfy chair, common sense prevailed. I phoned an old friend and he said "anytime you want to measure something to greater accuracy or resolution than your Fluke 77, then I've got an HP 3458A here you can borrow."

Problem solved.

_________________
Cheers - Martin ZL2MC


Top
 Profile  
 
 Post subject: Re: HP3490A bench multimeter
PostPosted: Sep Mon 23, 2019 9:54 pm 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 5853
Location: Montvale NJ, 07645
Too much money. You should be able to get a 3456A for that money in working condition. I don't know how Trademe works, but up here, you can return anything for any reason from Ebay. I don't think the manual adds much unless you plan on servicing it. Nearly all the HP manuals are available for download right from Agilent.


Top
 Profile  
 
 Post subject: Re: HP3490A bench multimeter
PostPosted: Sep Mon 23, 2019 11:02 pm 
Member

Joined: Nov Wed 30, 2016 7:35 pm
Posts: 6007
Location: Sunbury, Ohio 43074
I'd wait for a 12 digit one ........ :-D. 8)

_________________
Preserving the hist. of electronics, one boat anchor at a time! :)
https://www.bbtvtestequipment.com


Top
 Profile  
 
 Post subject: Re: HP3490A bench multimeter
PostPosted: Sep Tue 24, 2019 5:19 pm 
Member

Joined: Feb Wed 25, 2009 4:06 pm
Posts: 1443
Location: Morristown, N.J.
It's an impressive show piece but otherwise a waste of money. The chances that it operates properly are slim. For the price there are many more practical DMM's. A six digit display can almost guarantee problems, if not now, then in the near future.

_________________
Pete AI2V

"It's always darkest before it's pitch black"


Top
 Profile  
 
 Post subject: Re: HP3490A bench multimeter
PostPosted: Sep Tue 24, 2019 11:55 pm 
Moderator

Joined: Jan Thu 01, 1970 1:00 am
Posts: 2348
Location: Seattle, WA, USA
These were HPs first reasonably modern (contains ICs) bench multimeter. They use a whole bunch of proprietary HP 16-bit ROM chips which have a tendency to fail. It is very complex and hard to work on. I would recommend that if you were to buy a vintage HP bench multimeter, you should consider the 3455A. It was HPs first microprocessor controlled meter and is a real beauty of 70's engineering. The only major trouble spot with it is the capacitors on the 5V rail, but that is an easy fix. If you want a reasonably modern 6.5 digit meter, get the HP 34401A. It is the absolute #1 industry standard meter and was only very recently discontinued (over the loud objections of engineers everywhere, mind you!)

-Matthew

_________________
If it ain't broken, you’re not trying hard enough...


Top
 Profile  
 
 Post subject: Re: HP3490A bench multimeter
PostPosted: Sep Wed 25, 2019 11:59 am 
Member

Joined: Nov Wed 15, 2006 7:56 am
Posts: 1423
Location: germany
i don`t know this HP, but it was comm for 5 1/2 digit oldies to have the overflow at 199 999 or some models like the Fluke 8300A at 119 999, so I think it is this, allready , Resistor open = 1200000 kOhms > overflow.
The size is living room compatibe 19 inch rackmount, 10kg are also common for the time.

nice instrument 8)

Died ROMs can be swapped with a adaptor socket to eproms..
Voltnuts can sale the car to buy a Fluke 8508 or like that, it have a aged LTZ1000 and is very trustful.

Martin


Top
 Profile  
 
 Post subject: Re: HP3490A bench multimeter
PostPosted: Sep Wed 25, 2019 3:56 pm 
Member
User avatar

Joined: Sep Wed 10, 2014 7:13 pm
Posts: 838
Location: Urbana, Illinois
Quote:
Too much money. You should be able to get a 3456A for that money in working condition.
I own an HP 3456A. It was a lucky find on epay. $30 for the meter itself, $40 for shipping. It arrived in almost-working condition. Now it works perfectly after replacing 2 electrolytic capacitors in its power supply. But I don’t use it every day. For many routine tasks a generic 3.5 digit multimeter is more than good enough.

Quote:
These were HPs first reasonably modern (contains ICs) bench multimeter. They use a whole bunch of proprietary HP 16-bit ROM chips which have a tendency to fail. It is very complex and hard to work on.
Quote:
If you want a reasonably modern 6.5 digit meter, get the HP 34401A. It is the absolute #1 industry standard meter and was only very recently discontinued (over the loud objections of engineers everywhere, mind you!)
I do recommend taking the advice given by our fellow ARF members who have (or had) careers that exposed them to a bunch of lab-grade test gear. Their many years of hands-on experience is quite valuable.

Also when doing research on test gear, I recommend the “Test Equpment” and “Metrology” forums at:

http://www.eevblog.com/forum/index.php

-EB

_________________
I’m learning to be a leading-edge designer of trailing-edge technology.


Top
 Profile  
 
Post New Topic Post Reply  [ 13 posts ] 

All times are UTC [ DST ]


Who is online

Users browsing this forum: Blast, fondofradios, WoodchuckTN and 8 guests



Search for:
Jump to:  






























-->


Privacy Policy :: Powered by phpBB