Author Topic: Lets see your Nixie Tube equipment  (Read 127041 times)

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Offline tggzzz

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Re: Lets see your Nixie Tube equipment
« Reply #400 on: April 29, 2024, 03:54:29 pm »
One of my HP 740B DC Voltage Standard/Differential Voltmeters.  On its side for troubleshooting.  The Nixie tubes display the knob positions, they don't dynamically change with input voltage.  So just an electronic version of the mechanical digit wheels on a Fluke differential voltmeter.

How ... naff!

The only reason I can think of for that is marketing run wild - possibly due to an (ignorant?) large customer wanting it.
There are lies, damned lies, statistics - and ADC/DAC specs.
Glider pilot's aphorism: "there is no substitute for span". Retort: "There is a substitute: skill+imagination. But you can buy span".
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Offline Dave Wise

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Re: Lets see your Nixie Tube equipment
« Reply #401 on: April 29, 2024, 06:36:48 pm »
HP 740: It saves room on the front panel.  As you can see, there is none to spare - they even put the input/output binding posts on cables.

I wish they'd allowed you to turn the knobs from 9 to 0 instead of forcing you to crank all the way CCW.  Dialing it up and down to follow a varying input is clunky, probably a reason differential voltmeters were discarded when DVMs came on the scene.  But they can do things you can't do with a DVM and that's why I keep them.

Monsanto 2000: I rediscovered the Monsanto article, actually only the abstract because the American Chemical Society wants $10 for the full article.
https://doi.org/10.1021/cen-v044n004.p048
Restoring it would not have been possible without the service manual which I was lucky to find.

Fluke 8100: I don't know why they restricted it to 12000 counts, they could have done 16000 with virtually no changes.
UPDATE: A bit more than no changes, because the primary DAC is weighted 4-4-2-1 instead of 8-4-2-1.  The predecessor models counted to 11xxx... so 12 may have seemed like overkill.
« Last Edit: May 18, 2024, 02:57:30 am by Dave Wise »
 

Offline agent_power

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Re: Lets see your Nixie Tube equipment
« Reply #402 on: April 29, 2024, 08:52:47 pm »
Cool thread. I have one of those Flukes (w/o that option with the needle) and this HEB Digimeter 702. There's some filtering in the window, the Nixies look a bit red.

You'll see it in the repair section soon enough because it's got an intermittent fault.
 

Offline tggzzz

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Re: Lets see your Nixie Tube equipment
« Reply #403 on: April 29, 2024, 09:19:24 pm »
Does an early digital calculator count as "equipment"?

No "=" key, not HP, approx 1971 i.e. pre-HP35, four circular ICs, six signal transformers, four PCBs with wiring harness interconnections.

Very "early 70s" styling :)I

« Last Edit: April 29, 2024, 09:21:22 pm by tggzzz »
There are lies, damned lies, statistics - and ADC/DAC specs.
Glider pilot's aphorism: "there is no substitute for span". Retort: "There is a substitute: skill+imagination. But you can buy span".
Having fun doing more, with less
 
The following users thanked this post: Vince, Bud, BU508A, bd139, Exosia

Offline Dave Wise

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Re: Lets see your Nixie Tube equipment
« Reply #404 on: April 30, 2024, 01:40:46 am »
Oh you gave me a pain.  In my 20's I had a complete working Wang 360SE system including a CP-1 card reader and one of the keyboards was a 360KT trig model.  I gave it away.
 https://www.oldcalculatormuseum.com/wang360.html
 

Offline BU508A

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Re: Lets see your Nixie Tube equipment
« Reply #405 on: April 30, 2024, 05:05:41 am »
Does an early digital calculator count as "equipment"?

Just have a look at the very first posting in this thread.  ;D :-+
“Chaos is found in greatest abundance wherever order is being sought. It always defeats order, because it is better organized.”            - Terry Pratchett -
 

Offline tggzzz

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Re: Lets see your Nixie Tube equipment
« Reply #406 on: April 30, 2024, 10:13:48 am »
Does an early digital calculator count as "equipment"?

Just have a look at the very first posting in this thread.  ;D :-+

Tee hee. Only 8.5 years ago :)
There are lies, damned lies, statistics - and ADC/DAC specs.
Glider pilot's aphorism: "there is no substitute for span". Retort: "There is a substitute: skill+imagination. But you can buy span".
Having fun doing more, with less
 


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