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Many, many thanks JonW

Started by top204, Nov 11, 2024, 06:20 PM

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top204

As the title states... Many, many thanks JonW.

That Scope is bloody beautiful! It incorporates two of my loves. i.e. Digital and a Cathode Ray Tube. :-)

I was not aware that they did digital scopes with a CRT display, I thought they started digital types either connected to a PC or with an LCD display. And it has a 3.5" disk drive in it as well. Wow!. In fact... Woweeee, Wow, Wow!!!!!

I'll get into repairing the control on it. As you stated, bicarbonate of soda and super glue are incredible as a foundation, and I've used wall filler powder and superglue a few times to give a solid white replacement for plastic.

Those variable PSU are also excellent, with up to 120 volts at 3.0 Amps! I'll see what the noise level is because they are switched mode and, as you suggested, fit an LC filter to them if required, and many thanks for the LCD microscope. It is now sitting on my desk and being used. :-)

Again.... Many, many thanks JonW.

JonW

#1
No problem, glad to see it all going to a good home.  You will have to post some pics of it running once it fixed up.  Its the luxury model with a floppy drive 😄. It's been very well used as you can see from the dirty front panel buttons and knobs.  The button that's missing is long gone but I recon you may be able to get one off Ebay or make/3d print one or even take a mould off another button and use some silicone or hot melt glue stick.
Those floppy drives are £800 from Agilent.  Our Old VNA one broke and the cal kit data was on a floppy drive. Keysight quoted £800...  got one off Ebay for £5...  It's a good scope and It has that really nice Green color screen. It was the first of its kind in the day and must have been one of the very last CRT Agilent did.
I pmd you a load of links for the bench view and service manual.  You should be able to connect via GPIB or serial.  Python has a GPIB library so you can automate it. 

That version was one of the first with Mega Zoom.  It has 4M or maybe 8M point memory depth per channel so you can grab a decent chunk of data then zoom in on it.  I didnt test the digital channels but am sure it will work OK. 
It's old but it has a class Analog front end, one of the best in the industry, even today.

Be careful with those PSU, they are 120V with no protection mechanism to stop you winding them up to 120V..  I bought a couple of kikusui 150V ones as I needed really low noise and control via PC, but they served their purpose. 
You can test them with that scope on FFT


See_Mos

#2
Interesting!

I also have a couple of Kikusui power supplies but these are a bit older.  0-110V and 0-3A, all linear.  In order to keep the final regulator dissipation down they use an SCR pre-regulator into a big transformer.

I also have a digital storage 'scope that has a CRT display but I rarely use it the Hameg HM1008 as my trusty HM204-2 is much easier to use and for low voltage stuff I have a USB 4CH Picoscope.

In my final job we had 4CH storage scopes that also had CRT's and also had a printer built in.  I can't remember the make but I think they may have been Gould.  When I retired the workshop was closed and I could take anything that I wanted so why I didn't take the 4CH 'scopes is a mystery, and why I didn't take the Hitek 0-70V 0-30A power supply is also a mystery. The Hameg HM204-2 is mine, I bought it new way back when I was repairing video recorders for a living so that did come home with me.

In this picture I am repairing a camera distribution system from one of Shell's North Sea oil rigs. The grey box on the left is the PAL test card generator that I built in 1979 from a design by Malcolm Burrell and featured in the UK Television magazine.  It uses 46 TTL logic IC's for the pattern and a couple of linear ones for the PAL encoder.  It is still going strong but now uses an AD724 PAL encoder.  A couple of years ago I reproduced the same test card using a single PIC18F25K22 and an AD724 PAL encoder.