Scullcom Hobby Electronics #5 - Thurlby 1905A Intelligent Digital Multimeter 

I still have one of these meters 👍

I fell into the error trap just as the guy who chucked it. Makes an excellent multimeter.

Fascinating...cheers.

Very pleased with this video. Really like that little multimeter. Nice design and such.

Outstanding and Exteemely informative. I Thank you..

Very informative teardown, with an amazing level of detail. To know so much about the design of this meter I would have to guess that you must have worked on the original design. My only comment is the voltage reference is most likely LM399 not LM3999 as mentioned - correction, it is a LM3999, in T092 plastic case, a version of the LM399 without the thermal shield. Learn something new every day. :)

Thank so much!!

I was really hoping that you would cover the calibration procedure but a great video Thanks

Mine has the communication modulo but not the RMS modulo. It is currently the only other one on RU-vid. As far as I remember it is not an RS-232 modulo, removing it from it's home would be to much of a pain as it has an oscilloscope sitting on top of it.

Just bought one of these on ebay to give a better display than the LCD of my Fluke 8050, hope its as reliable. Video helped the decision thanks. Incidentally the R6502 and its 6522 are used in the BBC computer.

Thanks for this and very helpful. Usage a lot in common with my Black Start 4503 intelligent multimeter which looks very similar and I think came from the same factory?

That looks like a nice multimeter. Wouldn't mind one myself :). I currently use a Thurlby 1503, which I rather like the construction and design of.

I’ve got this exact meter but unfortunately that ribbon cable to the membrane buttons have no less than four broken ones. How would I go and repair those?

Friend, your channel is very good! Your videos are great. I already added your channel! My name is Michel, I'm from Rio de Janeiro - Brazil