Electronics > Projects, Designs, and Technical Stuff

Yet another resistance decade box

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Fortran:
0.1% doesn't make sense on 1R.
Probably not on 10R either.

But after that it would make a difference.  Even though a small one.
1% is good enough for me, and probably for most.

Majority rules.  :)
1% is practically free and that kind of money up front makes no difference to me.
0.1% isn't.  But if 10 people want a set so I know I'll sell it, it's fine by me.

Macbeth:
I agree - my own resistor decade I made with the bigger version of these switches I debated even having a 1 ohm setting, then went ahead and also made sure to use 500mW resistors there and the tolerance wasn't particularly relevant. The other ranges all done with 250mW and I selected from 1% resistors for the job. Certainly the higher range resistors would benefit from 0.1% tolerance but even then, that's not good enough - 1k per 1M - renders the bottom 3 digits untrustworthy.

julian1:
I'm interested - 2x sets (12) including resistors. The prices seem incredibly reasonable so 0.1% would be great if it can be managed.

Anyone scoped possible boxes/enclosures?

PuterGeek:
Quick question on the contact plating, are you going to have them hard gold plated or just ENIG?

The gold plating on ENIG isn't very robust since it's only intended for solderability. Once the gold wears of the contacts will be the nickel underneath with its higher resistance.

Hard gold would add to the cost but it is designed for this application.

Something to consider.

Fortran:
Just ENIG.
I can't seem to find a manufacturer that does hard gold and are willing to give me a quote. I'm guessing I can't afford it.

I'm not too worried though..  Even if you wear it down to the nickel it's probably still going to be better then original.

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