Re: [neonixie-l] Re: Jazzed this weekend project fixed HP 3456A bench MM!

[Bill Notfaded]

Thanks Bob.  I've noticed there are many counterfits of even the agilent
GPIB in interface.  It appears many of them work just fine too even with
the manufacturer drivers apparently:
https://www.eevblog.com/forum/testgear/flood-of-new-agilent-82357b-gpib-usb-adaptors-on-ebay-the-real-deal/

Crazy how many variants it looks like there are!!!  They pump out these
fakes left X right!

Bill

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Re: [neonixie-l] Jazzed this weekend project fixed HP 3456A bench MM!

[martin martin]

Goldmine electronics- cool site!



~
*mcvei...@gmail.com *


On Mon, Aug 12, 2019 at 5:23 AM 'John Rehwinkel' via neonixie-l <
neonixie-l@googlegroups.com> wrote:

> It's pretty good on most voltages.  Now I need a good reference for
> resistance.  I've been waiting for months for a new dmmcheckplus but
> apparently the seller has sold all his business to someone else.  They
> useVishay type PTF56 for ohms reference.
>
>
> Goldmine Electronics has some nice 0.01% calibration resistors for
> attractive prices.
>
> Here's one example:
>
> https://www.goldmine-elec-products.com/prodinfo.asp?number=G21551
>
> Going to their site and searching for "calibration resistor" brings up a
> nice variety from 5Ω to 2Meg.
>
> - John
>
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> 
> .
>

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Re: [neonixie-l] Re: Jazzed this weekend project fixed HP 3456A bench MM!

[Robert L]

Hi Bill,

I *REALLY* think an off the shelf USB-GPIB interface on a reasonably 
current computer will be the way to go. There's so much more involved than 
just the hardware interface! Having a system where the various software and 
hardware pieces play well together is no small accomplishment. I'll also 
mention that network accessed instruments are also in the mix... One 
project I was recently working on used LAN access to a R instrument with 
a USB-GPIB link to a couple of HP instruments... One 82357x interface with 
the GPIB instruments daisy chained off that one port.

Off all the places where I would choose to put my efforts, duplicating the 
Keysight and R tools would not be my first choice! Then again, these are 
tools of my trade and my employers would show me the door if I wasn't 
finding efficient ways to accomplish goals. Your objectives and choices for 
a hobby will be less constrained!

The Keysight 82357A/B USB-GPIB interface referenced above is a known good 
solution. I have multiple copies at work and here at home... and have been 
using them for years!

Again, bets regards,
Bob

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Re: [neonixie-l] What are these?

[Dekatron42]

The one marked TD71 is an OTIS Touch Tube used in elevators. It is a touch 
sensitive trigger tube. They are also named 425A5 or 2040. They are similar to 
the RCA 1C22.

The 71 in TD71 is probably the voltage drop when triggered. You had to replace 
tubes with the same voltage drop to get the circuit to work properly. I’ve seen 
voltages from 69 to 74 stamped on these.

The other tube looks like a Geiger tube.

/Martin

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Re: [neonixie-l] What are these?

[Dekatron42]

Should have said 1C21, not 22.

/Martin

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Re: [neonixie-l] What are these?

[martin martin]

Looks like a 1950s vintage elevator pilot lamp.  I had one till it fell and
shattered!  I may be wrong, but looks close.



~
*mcvei...@gmail.com *


On Mon, Aug 12, 2019 at 2:46 PM Mac Doktor  wrote:

>
> On Aug 12, 2019, at 5:30 PM, Nicholas Stock  wrote:
>
> Any ideas folks?
>
>
> I can't think of the name of that indicator tube, either. One just sold on
> eBay but the seller didn't include a stock number (and he has the boxes
> swapped):
>
>
> https://www.ebay.com/itm/Burroughs-Nixie-Indicator-Tube-and-National-Readout-Tube-/254320776250
>
>
> As for the second tube, I'm guessing photo or radiation detector of some
> sort. Guessing.
>
>
> Terry Bowman, KA4HJH
> "The Mac Doctor"
>
> “Questions are a burden to others; answers a prison for oneself.”—*The
> Prisoner*, "Arrival"  8D
>
> --
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> 
> .
>

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[neonixie-l] Last call on the Symbol Nixies

[Nicholas Stock]

Folks, here's what I have left to offer before the rest go on 'the bay'.
Thanks to those who have already bought some!

Z521M
B-50358
NL-5016
B-5016
B-5032
B-5999
NL-811
NL-50325
NL-5442
B-54364
B-54365
NL-5448
ZM1031
ZM1033
NL5992

PM me if interested as usual

Cheers,

Nick

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Re: [neonixie-l] What are these?

[Mac Doktor]

> On Aug 12, 2019, at 5:30 PM, Nicholas Stock  wrote:
> 
> Any ideas folks?

I can't think of the name of that indicator tube, either. One just sold on eBay 
but the seller didn't include a stock number (and he has the boxes swapped):

https://www.ebay.com/itm/Burroughs-Nixie-Indicator-Tube-and-National-Readout-Tube-/254320776250


As for the second tube, I'm guessing photo or radiation detector of some sort. 
Guessing.


Terry Bowman, KA4HJH
"The Mac Doctor"

“Questions are a burden to others; answers a prison for oneself.”—The Prisoner, 
"Arrival"  8D

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Re: [neonixie-l] Re: Jazzed this weekend project fixed HP 3456A bench MM!

[gregebert]

 As far as I can tell, GPIB is pretty simple: just a matter of controlling 
16 TTL-level signals thru the GPIO pins of your favorite microcontroller, 
and the commands themselves are just strings of text characters. The GPIB 
cables are pretty cheap at surplus stores, so this should be a rather cheap 
and not very complex project.

I've considered doing this from one of my Raspberry Pi systems, for example 
the octoprint controller for my 3D printer, because all of the GPIO pins 
are available. Just too busy right now to take this concept to reality.

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Re: [neonixie-l] Re: Jazzed this weekend project fixed HP 3456A bench MM!

[martin martin]

Welcome to the Nix folks!
I used to work for 3M in Camarillo and have a few HP-85s. They were popular
in the 80s for lab and automating instruments.  Most have HPIB IO
controllers built-in or add ons.  I am sure I can get one for you but
shipping may high as they are all made in the US and have lots of steel and
little plastics.

I have an 1977 HP LED lab clock and uses HPIB to control it.





~
*mcvei...@gmail.com *


On Mon, Aug 12, 2019 at 1:21 PM Bill Notfaded  wrote:

> Wow Robert that's really good information.  It seems the National
> Instruments are the MOST expensive interfaces as well.  I was wondering if
> the HP/Agilent/Keysight USB interface would be workable as well!  I like
> their price much better for one thing too!  This is great advice because NI
> makes you think you need their GPIB interface and wow they're expensive
> even used ones are.  Python is one of the best scripting languages as
> well... for me being a network engineer it's awesome.  Thanks!
>
> Bill
>
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> 
> .
>

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[neonixie-l] Re: Welcome & please introduce yourself!

[Bill Notfaded]

Yes welcome!  I love learning stuff you EE types with a lot of experience 
have to offer.  I'm a computer scientist so we have some things in common 
but when it comes to Electrical Engineering I alway know where to come for 
help.

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[neonixie-l] Re: Jazzed this weekend project fixed HP 3456A bench MM!

[Bill Notfaded]

Wow Robert that's really good information.  It seems the National 
Instruments are the MOST expensive interfaces as well.  I was wondering if 
the HP/Agilent/Keysight USB interface would be workable as well!  I like 
their price much better for one thing too!  This is great advice because NI 
makes you think you need their GPIB interface and wow they're expensive 
even used ones are.  Python is one of the best scripting languages as 
well... for me being a network engineer it's awesome.  Thanks!

Bill

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RE: [neonixie-l] Just won auction for idk what yet?

[Michail Wilson]

Tyler,

 

https://www.nixies.us/projects/its1a-clock/

 

Michail Wilson

206-920-6312

 

From: neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] On 
Behalf Of Tyler Bourne
Sent: Monday, August 12, 2019 10:54 AM
To: neonixie-l
Subject: Re: [neonixie-l] Just won auction for idk what yet?

 

I have a few of these tubes as well.  I've been looking for a good schematic 
for a ITS1A clock.

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 .

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[neonixie-l] Re: Welcome & please introduce yourself!

[Tyler Bourne]

Welcome to the group!

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Re: [neonixie-l] Just won auction for idk what yet?

[Tyler Bourne]

I have a few of these tubes as well.  I've been looking for a good 
schematic for a ITS1A clock.

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[neonixie-l] Re: Jazzed this weekend project fixed HP 3456A bench MM!

[Robert L]

Hi Bill,

" I think my next foray into this is getting a GPIB usb interface and 
setting up some automated test and data sampling exercises."

Check out Rohde & Schwarz Forum... This has become my instrument control 
environment of choice... Python with some nice extensions and tools. 
Started using Forum to control a R instrument, now use it for a wide 
variety of Tek and HP... uh... Agilent... uh... Keysight gear. 

https://www.rohde-schwarz.com/us/applications/using-r-s-forum-application-for-instrument-remote-control-application-note_56280-50946.html

The Keysight 82357A and 82357B USB-GPIB adapters work well for me as well:
https://www.ebay.com/itm/New-In-Box-HP-Agilent-82357B-USB-GPIB-Interface-High-Speed-USB-2-0/192183274642?epid=921927408=item2cbf040c92:g:iMkAAOSwaEhZEuUy

I also like the Keysight instrument control library and drivers... they 
have been reliable for me. Forum has tools to discover and control 
instruments, but I prefer Keysight Command Expert for this... Keysight and 
Forum play well together...
https://www.keysight.com/main/software.jspx?ckey=1184883=eng=US=-35190.0.00=1184883=PV

I suggest you avoid National Instruments software if possible... MASSIVE 
downloads and seems overly intrusive... 

Just a few suggestions on where to start!

Best regards,
Bob
Best regards,
Bob

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[neonixie-l] Re: B7971 questions

[gregebert]

If you have a capacitance meter, you can compare capacitance readings on 
this pin vs the same on good tubes.
If the values differ significantly, it suggests the break is closer towards 
the pin.

I suspect it's somewhere with the connections to/from the internal 'circuit 
board'. Tapping the tube is risky because it could cause segments to short 
against eachother (I have a tube like this).

I also have a tube with a dead segment, and nothing is obviously wrong from 
a visual inspection. Gentle tapping did not help, and cranking the voltage 
way up did not produce any glow.
Since other segments are good, this failure is not a gas-leak. It's 
unlikely to be cathode poisoning, either. It's still a very useful tube so 
take care of it.

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[neonixie-l] Re: Welcome & please introduce yourself!

[schmitt trigger]

40+ years of experience as an EE. My very first electronic project that 
actually worked was a vacuum-tube amplifier, and their warm glow has stayed 
close to my heart.
Worked as an engineer all my life, with the exception of a brief stint in 
administration. But as a hobby, I've never abandoned electronics.

As I'm nearing retirement, for my hobby I've been returning to my 
roots...discrete transistors and of course everything glass (vacuum or 
gas filled).

That doesn't mean that I don't use modern technology. Microcontrollers are 
great to drive Nixies and Dekatrons, and most importantly scanned bargraphs 
(my next project)

I hope to learn from this community, and most importantly, share some of my 
own experience.


On Wednesday, September 19, 2018 at 10:03:23 AM UTC-5, neonixie-l wrote:
>
> Ladies & Gentlemen,,,
>
> We are getting a steady stream of new members - it'd be great if, instead 
> of just lurking, you could introduce yourselves with a bit of detail about 
> your interests, what you've built or intend to build/dream of building. 
> Even what gets you up the morning and makes you smile!
>
> Even existing members (there are over 1,000) could chip in - there's some 
> great stuff around...
>
> Welcome, one and all to this great community!
>
> Nick
>
>
>

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[neonixie-l] Re: B7971 questions

[newxito]

 

After 3 years I finally managed to test the tubes. The good news: 7 seem to 
be ok so I can start designing the board. The bad news: 1 has a broken 
connection on segment 2. I’ve applied some heat to the pin, but I think 
there is no way to fix it. I got 3 tubes with Burroughs label, 4 with 
Ultronic label and 1 with no label, quite a mix…

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Re: [neonixie-l] Jazzed this weekend project fixed HP 3456A bench MM!

[Bill Notfaded]

Thanks John these looks great.  Vishay seems to make nice ones with low 
ppm/degree C and low tolerance.  A few of these across the ohms range would 
work great for home calibration lab.

Bill

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Re: [neonixie-l] Jazzed this weekend project fixed HP 3456A bench MM!

['John Rehwinkel' via neonixie-l]

> It's pretty good on most voltages.  Now I need a good reference for 
> resistance.  I've been waiting for months for a new dmmcheckplus but 
> apparently the seller has sold all his business to someone else.  They 
> useVishay type PTF56 for ohms reference.

Goldmine Electronics has some nice 0.01% calibration resistors for attractive 
prices.

Here's one example:

https://www.goldmine-elec-products.com/prodinfo.asp?number=G21551 


Going to their site and searching for "calibration resistor" brings up a nice 
variety from 5Ω to 2Meg.

- John

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Re: [neonixie-l] Jazzed this weekend project fixed HP 3456A bench MM!

[Bill Notfaded]

You're right Martin.  I really like the way HP built their gear back in the
70's and 80's.  They really over engineered everything.  It's hard not to
love!  I have a Keithley 195A as well and it's way way off on its
calibration.  Just goes to show how different and also non-trivial cal can
be.  It's not rocket science but it also has a lot of facets to doing it
well.  I think my next foray into this is getting a GPIB usb interface and
setting up some automated test and data sampling exercises.

Bill

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[neonixie-l] Jazzed this weekend project fixed HP 3456A bench MM!

[Dekatron42]

Nice!

Always good when instruments can be repaired.

I learned something at a previous job that I didn’ think about previously and 
that is that a calibrated instrument is no proof for that it makes correct 
measurements after it has been calibrated, the calibration only shows that up 
to that last calibration the instrument had made correct measurements! The 
calibration doesn’t say anything about future measurements, only something 
about those already made.

I’ve had a few of my surplus HP-instruments calibrated professionally so that I 
know that what I bought second hand works as they should. Well spent money I 
think as the cost of the instruments and calibration has been way lower than 
50% of buying new instruments.

/Martin

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