Author Topic: S.J Electronics MK IV Universal T&M System  (Read 7578 times)

Mr Eastwood

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S.J Electronics MK IV Universal T&M System
« on: January 12, 2013, 04:15:17 PM »


This is something I bought cheap on Ebay the other year and I thought I'd post because it was quite unusual in that it has 4 tools in one unit;  I'm not sure when it was built but I've used it quite a bit whilst learning more and more about electronics;  it was a step up from my previous odd bits of gear but now I'm ready to move on and upgrade.

If anyone has one of these and has got a service manual for it I'd be really interested in getting hold of a copy.
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SeanB

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Re: S.J Electronics MK IV Universal T&M System
« Reply #1 on: January 12, 2013, 04:33:49 PM »
Very nice. 1980's look about it. Pics of the inside will tell which 4 instruments it was made from. I will guess the counter is Intersil and a pretty standard appnote example complete with ECL prescaler. The DVM will be interesting as normally there is an ICL7106/7 solution there, here there is a pretty nice 5 digit backlit LCD with 3 displays to show additional info. I would guess this is a Cyrustek meter or a predecessor of it. Power supply probably uses a 7107 chipset and nice having the separate 5 and 15V rails. function generator is probably XR2206 based, or a discrete solution based on the GW function generator.

Kiriakos GR

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Re: S.J Electronics MK IV Universal T&M System
« Reply #2 on: January 13, 2013, 12:17:23 PM »
I have never see that brand before, but there is a significant amount of brands which came and go as comets.
Service manual for it ?   I do wish you good luck,  but it will not be easy.


Kiriakos GR

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Re: S.J Electronics MK IV Universal T&M System
« Reply #3 on: January 13, 2013, 05:46:07 PM »
I think that I found the dad of this device.   ;)

http://www.sjelectronics.co.uk/   Suggestion : Contact them to learn more.

Mr Eastwood

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Re: S.J Electronics MK IV Universal T&M System
« Reply #4 on: January 15, 2013, 05:56:15 PM »
I think that I found the dad of this device.   ;)

http://www.sjelectronics.co.uk/   Suggestion : Contact them to learn more.

I've already tried to email them before but with no luck;  if it goes badly out of spec I'll crack it open and take a peek;   app-notes for chipsets can be a real gold-mine for info!
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Mr Eastwood

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Re: S.J Electronics MK IV Universal T&M System
« Reply #5 on: December 09, 2013, 12:41:17 PM »
I took out my DMM module to have a look the other day, and took some pics;  this one uses the MAX134 chipset.
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steve30

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Re: S.J Electronics MK IV Universal T&M System
« Reply #6 on: December 09, 2013, 05:03:27 PM »
That LED modules looks really nice :)

Mr Eastwood

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Re: S.J Electronics MK IV Universal T&M System
« Reply #7 on: December 20, 2013, 06:47:45 AM »
That LED modules looks really nice :)

It is really nice and clear;  do they still make these, does anyone know where I could get one similar to this from?
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steve30

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Re: S.J Electronics MK IV Universal T&M System
« Reply #8 on: December 20, 2013, 09:23:33 PM »
I've never seen a fancy one like that. I wouldn't be surprised if it was custom, but I may be wrong.

I expect it would be possible to make something like that by hand, using individual LEDs on a PCB and having some sort of printed or etched overlay.