Electronics > Beginners

Multimeters and Resistors

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paulca:
As my eyes are deteriorating rapidly in the last 10 years, due mostly to very heavy VDU usage I find it impossible to read the small blue resistors, completely impossible, even with a magnifier inspection lamp. 

The 5% brown carbon resistors (like from bitsbox) are much easier to read.  Even then sometimes they are tricky.

So here is what I did.

I bought a large compartment box and a pack of known resistors.  I placed them in decades eg:

10, 100, 1k, 10k, 100k, 1M
22, 220, 2k2, 22k, 220k, 2M
47, 470, 4k7, 47k, 470k, 4M

Most are still on tape strips, but used ones lie loose in the trays under the tape strips.

These get me by.  Should I ever decide to get the other decades I'll just start another box.

When I take a resistor out, I give it a quick glance that it looks "probably right", if I have any doubt I stick it in the breadboard and test it with the meter.

When I'm tearing down a breadboard I put them all back where they belong. 

Of course mistakes happen, I drop resistors into random slots and so forth.

What I am planning to get round to is a resistor jig for the meter.  Just a couple of old breadboard rails or similar that I can croc clip onto and press resistors against to check them quickly before use or putting back in the compartment box.

Vtile:
You can also make something like this. It is made from solid-core mains copper wire and quick glued to some fiber board. The original idea is variation from IIRC Conrad Hoffman's "Minimetrology lab" articles, Conrad is frequently hanging on the Metrology section here at eevblog.

kalel:

--- Quote from: Vtile on November 27, 2017, 05:16:46 pm ---You can also make something like this. It is made from solid-core mains copper wire and quick glued to some fiber board. The original idea is variation from IIRC Conrad Hoffman's "Minimetrology lab" articles, Conrad is frequently hanging on the Metrology section here at eevblog.

--- End quote ---

That looks interesting, where do the measurement/connection to instrument leads go? Unless I got the purpose wrong.

Vtile:

--- Quote from: kalel on November 27, 2017, 05:28:12 pm ---
--- Quote from: Vtile on November 27, 2017, 05:16:46 pm ---You can also make something like this. It is made from solid-core mains copper wire and quick glued to some fiber board. The original idea is variation from IIRC Conrad Hoffman's "Minimetrology lab" articles, Conrad is frequently hanging on the Metrology section here at eevblog.

--- End quote ---

That looks interesting, where do the measurement/connection to instrument leads go? Unless I got the purpose wrong.

--- End quote ---
Like Paulcas plan, I have used just typical croc-clips to these jig arms.

6PTsocket:

--- Quote from: Brumby on November 24, 2017, 08:58:26 am ---I could read a resistor colour code from 4 feet away on a carbon film resistor ... but when they introduced the metal film with the blue body, I'm challenged to read some values with my head magnifier at times!!

I'd really like to knee-cap the bozos that came up with that.

--- End quote ---
Not to worry. Leaded resistors are becoming obsolete and everything is going SMD. They all have the value printed on them. The last digit is the number of zeros and R is used as a decimal point. The down side is you need a microscope to see the #!$%= thing and a whole new set of tools to replace them.

Sent from my SM-G900V using Tapatalk

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