Electronics > Beginners
Multimeters and Resistors
Nusa:
Since your resistors are conveniently in strips, leave them there until you actually need to use one.
All the resistors in the same strip are the same, so measure one without removing it from the strip, then write its value on the paper strip on both sides. You just saved yourself a lot of future measurements or puzzling over color codes.
Repeat for your other strips of resistors.
It's possible you have a red-green color deficiency mild enough it's never been diagnosed. That is the most common form of color-blindness (a misnomer in most cases, as they still see plenty of color). If so, it just means you see some colors less brightly than some people, which can make reds/browns/oranges hard to identify except in really good light. If other people have no problem reading off the color bands on the same items, then it probably is your eyes.
Kohlrak:
--- Quote from: Nusa on November 24, 2017, 11:15:53 am ---Since your resistors are conveniently in strips, leave them there until you actually need to use one.
All the resistors in the same strip are the same, so measure one without removing it from the strip, then write its value on the paper strip on both sides. You just saved yourself a lot of future measurements or puzzling over color codes.
Repeat for your other strips of resistors.
--- End quote ---
Too late for some of them, though I think most of them (the ones with the board) didn't come with strips. If they did, i got excited thinking that reading them from colors would be easy.
--- Quote ---It's possible you have a red-green color deficiency mild enough it's never been diagnosed. That is the most common form of color-blindness (a misnomer in most cases, as they still see plenty of color). If so, it just means you see some colors less brightly than some people, which can make reds/browns/oranges hard to identify except in really good light. If other people have no problem reading off the color bands on the same items, then it probably is your eyes.
--- End quote ---
To be honest, the colors when juxtaposed look different, distinctly, but the lighting and such overall makes it rather difficult to tell which color is supposed to be what, even though they are different enough to know that they're different. So, i'm not sure it's actually the eye thing, but incase it is, do you have any images or ways of testing the mildness as opposed to absolute?
--- Quote ---A 1.8k resistor (1800 ohms) is brown gray red (18 followed by 2 zeros).
--- End quote ---
So it's not scientific notation, but a direct "see 2 color numbers, with this many zeros after it decided by third band." That makes it easier. So black brown black for 1 ohm. Seems I dont' have the 1.8k, I have a 1.5k, so i'm looking for brown green red gold. Oh wait, some of these have more than 4 bands... |O
EDIT: nvm, it's 4 bands, it's just weird glare from the lighting in here.
IanB:
--- Quote from: Kohlrak on November 24, 2017, 11:25:44 am ---So it's not scientific notation, but a direct "see 2 color numbers, with this many zeros after it decided by third band." That makes it easier. So black brown black for 1 ohm.
--- End quote ---
The third band is a multiplier: x0.1, x1, x10, x100, etc.
Therefore 1 ohm is brown black gold (10 x 0.1 = 1).
Kohlrak:
--- Quote from: IanB on November 24, 2017, 11:32:07 am ---
--- Quote from: Kohlrak on November 24, 2017, 11:25:44 am ---So it's not scientific notation, but a direct "see 2 color numbers, with this many zeros after it decided by third band." That makes it easier. So black brown black for 1 ohm.
--- End quote ---
The third band is a multiplier: x0.1, x1, x10, x100, etc.
Therefore 1 ohm is brown black gold (10 x 0.1 = 1).
--- End quote ---
Seems more logical to do black brown black, but hey, my job is to read, not to paint them myself. Got one registered 988, definitely looks brown black red. When i changed to 20k, it registered 1.18, so starting when the mode ends with k, i need to add 3 zeros, right? How would it display the 1M ohm and the 10 ohm that are supposedly in here? I assume I go to 2000k, so would it display as 1 and 10 respectively?
Nusa:
Many informal color tests on the internet. Here's one: http://enchroma.com/test/instructions/
Here's the manual for the common centech meter: https://manuals.harborfreight.com/manuals/98000-98999/98025.pdf
Harbor Freight periodically has free-with-purchase store coupons, so any hobbyist who lives near a Harbor Freight has probably grabbed one or more over time. Including me.
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