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Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
youll wnat to look up "jewel" thingies that the professionally made instrument use,which give ultra low friction. I have no idea if theis is wise or possible.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Patrick wrote ...
youll wnat to look up "jewel" thingies that the professionally made instrument use,which give ultra low friction. I have no idea if theis is wise or possible.
I'd argue that the cheaper 'professionally made' instruments don't use 'jewel' technology.
Magnet18 started this thread by emphasising that the limiting factor was his budget.
A self-lubricating phosphor-bronze may have adsvantages, but what I've suggested above won't have much friction anyway.
Minimizing friction while remaining 'within budget' is the priority though, I agree.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
One cheap option may be to buy 15 low cost analogue multimeters and use the moving coil meter part and make new scales. (saw off the body/switch/pcb part leaving coil/magnet/housing and clear plastic front)
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
I just dont see how you can possibly make your own meter movements and have them be usefully accurate. honestly I would just buy some of the Harris/ intersil ICL7107CPL 40 pin IC's and then use LED 7 segment displays.
there is an example of just such a case here on the forum.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Patrick wrote ...
I just dont see how you can possibly make your own meter movements and have them be usefully accurate.
The physics dictates that it is simply a question of friction on one side, and power consumed on the other.
The less friction, the less power consumed for the same accuracy.
A hard steel pin, sharpened at both ends, and pivoting between two centre-punched indentations on correctly spaced (adjusted) plates would have virtually no friction anyway. The vast majority of power consumed would be in overcoming spring tension (or gravity, depending on method used).
I really don't see the problem in building an accurate analogue meter, although a digital meter would presumably draw less power from the circuit being measured, at the expense of needing it's own supply.
However, depending on Magnet18's application, if cheap DMM's with an accuracy of 2% are going to be suitable, then use those.
It basically comes down to 'what is most suitable for the application', and Magnet18 has not disclosed details of this. He simply requested advice on analogue meters.
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Where to procure meters?
