Electronics > Mechanical & Automation Engineering

material to make DMM probes with?

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xavier60:
For the actual probe tip, I use the 1.5mm steel shaft material that's used in small electric motors. It doesn't rust in normal use and holds a sharp point for months. The extra bit of resistance has not been a problem.
I have not be able to find for certain what sort of alloy it is, that's if there isn't more than one type of material.

Calvin:
Hi,

how about PE as insulator?
Cheap, very high surface- and volume resistance and lowish epsilon.

regards
Calvin

coppercone2:
Well it depends on resistance. I like really low resistance probes but for digital work, making a needle probe out of a stainless steel pin could be really good, since it does not matter how much resistance is in the probe when measuring a voltage signal. Really, you should have diff probes for voltage and for current/resistance I think, if you really want to optimize your measurements and keep burden voltage in check.

Dave Jones showed that gold plating really makes a huge difference. I thought about getting the less-toxic gold plate to try it out, but really I wanted to do things with pogo pins since they are gold plated, replaceable tip, good grip. But there are defiantly different things you can do. Let's just say I would need a lineup of designs to make before I bought expensive gold plate.

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