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Old 20th Apr 2021, 6:42 pm   #21
Chrispy57
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Default Re: Large Screen Oscilloscopes

Hi - just to add a little variety to the mix - here's a look at a Leader LBO-9C oscilloscope with a 9in (diagonal) screen and 10kHz bandwidth that may be of interest? It has its X input, also Z input and marker pulse input sockets on the rear panel and the Y input on the front panel.

I acquired mine a few years ago from a factory closing down auction, converted from 120V to 240V operation and just use it with homebrew "octopus" and curve tracer projects at present.

Cheers
Chris
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Old 20th Apr 2021, 6:44 pm   #22
Ed_Dinning
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Default Re: Large Screen Oscilloscopes

Hi Knobtwiddler, as it is only for audio use, have a look at the TV magazine of the 70's ?
They had a design for a large screen scope base on a common TV chassis.

Home build possibly, but I think much of the circuitry was already in the TV
An isolation transformer was of course essential

Ed
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Old 20th Apr 2021, 6:54 pm   #23
factory
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Default Re: Large Screen Oscilloscopes

HP also made X/Y displays with the same CRT, model 1300A, seen a few more of these including one rebranded for Spectral Dynamics.
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HP 1308A 8 channel version.
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David
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Old 20th Apr 2021, 6:59 pm   #24
factory
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Default Re: Large Screen Oscilloscopes

Quote:
Originally Posted by Ed_Dinning View Post
Hi Knobtwiddler, as it is only for audio use, have a look at the TV magazine of the 70's ?
They had a design for a large screen scope base on a common TV chassis.

Home build possibly, but I think much of the circuitry was already in the TV
An isolation transformer was of course essential

Ed
Seen a video on youtube where a TV was crudely modified to use as an X/Y display, he promptly ruined the CRT in the first test by leaving the intensity too high with no input.

David
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Old 21st Apr 2021, 9:54 am   #25
knobtwiddler
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Default Re: Large Screen Oscilloscopes

Thank you, all! It looks like I might have found a LSO from a group member! This thread has plenty of food for thought, and I'm highly appreciative.
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Old 21st Apr 2021, 2:28 pm   #26
TonyDuell
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Default Re: Large Screen Oscilloscopes

Quote:
Originally Posted by Trigon. View Post

I does indeed have an extender board stashed inside, which I always thought was quite impressive. I wonder if you have that service manual as .pdf ? If so, I'd be very pleased to have a copy - just in case...

Cheers
The HP1311 operating/service manual is available here :

http://www.hpmuseum.net/exhibit.php?hwdoc=732

That site has a lot of older HP computer-related manuals.
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Old 21st Apr 2021, 3:44 pm   #27
Craig Sawyers
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Default Re: Large Screen Oscilloscopes

This is a bit on the esoteric side. This is the video output from a Tek 7912HB transient digitizer on a TV. A 1980's 19" rack full of everything Tek could throw at an instrument. Bit slice processors, custom high speed silicon, a scan converter tube internally.

Note the horizontal timescale...

Craig
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Old 21st Apr 2021, 3:51 pm   #28
Craig Sawyers
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Default Re: Large Screen Oscilloscopes

Keeping on the esoteric large screen side, this is a R&S SWOB PolyskopII. This is actually a spectrum analyzer with inbuilt tracking generator. A monster hernia inducing beast, it actually works quite well. It has a built in monochrome TV screen.

Craig
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Old 21st Apr 2021, 3:56 pm   #29
Trigon.
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Default Re: Large Screen Oscilloscopes

Quote:
Originally Posted by TonyDuell View Post
The HP1311 operating/service manual is available here :

http://www.hpmuseum.net/exhibit.php?hwdoc=732

That site has a lot of older HP computer-related manuals.
Doh... I'd long forgotten about that site.. The only manual there is for the 1311B rather than my 1311A, but I'm sure it will do the job.

Many thanks.

Cheers
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Old 21st Apr 2021, 4:22 pm   #30
chriswood1900
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Default Re: Large Screen Oscilloscopes

Seeing this thread reminded me of a large screen unit for audio use sold as either the Wayne Kerr RA20 which I briefly owned or the Ferrograph ARA1.
This was designed to go up to 30 or 200khz depending on the range, I enclose a couple of pictures for those interested.
Of course its so much easier now you can use PC based scope and enlarge the image to what ever you like with a large screen or projectors.
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Old 22nd Apr 2021, 5:56 pm   #31
Jez1234
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Default Re: Large Screen Oscilloscopes

I recall a huge demonstration scope at college a LONG time ago and remembering it as being Cossor... I never saw it in operation. This thread is making me think I probably remembered it incorrectly and it was likely the Airmec though.
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