Thanks! Unfortunately, even with multiple coats (or because) of clear lacquer over the label, my dirty paws left marks that won't wipe away easily. This was 200gsm paper, printed at the local office products outlet, but next time I'll try something more durable, some sort of plastic that they seem to have. Or maybe I'll try to just glue some protective film over the paper...
I don't want to criticize your design, but is there any reason why you choose to use all those banana sockets instead of only 3 sockets and then switches or jumpers to select the resistance ?
Mostly because that's how hobbyists tend to do it, so I really did consider anything else. But wouldn't have used switches because of:- Expense (high quality rotary switches are very expensive). Contact resistance and oxidation issues are a concern, especially for the lower values. More wiring would be required. This was meant intended as a precision "reference" standard, and I think any other method would have introduced extra sources of error and uncertainty. Pretty good quality connectors weren't too expensive, especially compared to the cost of the resistors, so reducing the number of them wouldn't help the cost much. Also, a switch setup would probably prevent the voltage divider configuration that I showed towards the end.
@@bertoid Well it works and looks like an expensive meter, so I guess that's the main thing. I was thinking about jumpers and pin strips with maybe wiring terminal blocks as they are very cheap and much cheaper than pluggable sockets.
@@arnolduk123The aim here was the highest precision possible within the budget I had. For me, that meant resistors that cost around $50 each (you can pay lots more). But that investment would be wasted if it was wired up with cheap connections that introduce sources of error. So good and fairly pricey connectors were required (and again you can pay a lot more). The force connections had lower requirements, so cheaper sockets were used there. I'm happy with the choices I made.
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Nice unit. Love the label.......I have a bad habit of just using my Dymo...LOL
Thanks!
Unfortunately, even with multiple coats (or because) of clear lacquer over the label, my dirty paws left marks that won't wipe away easily. This was 200gsm paper, printed at the local office products outlet, but next time I'll try something more durable, some sort of plastic that they seem to have. Or maybe I'll try to just glue some protective film over the paper...
Excellent project Bertoid, thanks for open sourcing the specifics.
Thanks!
Time will tell how useful it turns out to be...
Bravo bravo bravo
Well done and a useful project, thanks.
Thanks!
I don't want to criticize your design, but is there any reason why you choose to use all those banana sockets instead of only 3 sockets and then switches or jumpers to select the resistance ?
Mostly because that's how hobbyists tend to do it, so I really did consider anything else. But wouldn't have used switches because of:-
Expense (high quality rotary switches are very expensive).
Contact resistance and oxidation issues are a concern, especially for the lower values.
More wiring would be required.
This was meant intended as a precision "reference" standard, and I think any other method would have introduced extra sources of error and uncertainty.
Pretty good quality connectors weren't too expensive, especially compared to the cost of the resistors, so reducing the number of them wouldn't help the cost much.
Also, a switch setup would probably prevent the voltage divider configuration that I showed towards the end.
@@bertoid Well it works and looks like an expensive meter, so I guess that's the main thing. I was thinking about jumpers and pin strips with maybe wiring terminal blocks as they are very cheap and much cheaper than pluggable sockets.
@@arnolduk123The aim here was the highest precision possible within the budget I had. For me, that meant resistors that cost around $50 each (you can pay lots more). But that investment would be wasted if it was wired up with cheap connections that introduce sources of error. So good and fairly pricey connectors were required (and again you can pay a lot more). The force connections had lower requirements, so cheaper sockets were used there. I'm happy with the choices I made.