| Electronics > Beginners |
| Multimeters and Resistors |
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| Kohlrak:
--- Quote from: GreyWoolfe on November 25, 2017, 07:49:41 pm --- --- Quote from: IanB on November 24, 2017, 10:36:10 am ---Here's a picture of the meter measuring a 1.8 k resistor (1800 ohms) on the 2000 ohms range: --- End quote --- This should be framed--a HF meter that actually works. I had 2 of them, new in the package with new batteries added, that measured a 30R resistive element at over 250R. My Aneng 8008 reads it correctly. They were free so I obviously got what I paid for. One of my co-workers loves HF and their free coupons. After him giving me the 6th free meter, I had to ask him to stop. |O --- End quote --- Mine works, too, as far as i can tell. I have a resistor value i'm not supposed to have, but the colors i'm seeing (either black, green, or blue on band 2) suggest that i have resistors that i'm not supposed to have (none of the resistors are supposed to have a 5 or 6 as a second digit, and I can already confirm at least one accurate resistor). As a side note, avoid those eye tests online. I decided to use php (since i hate javascript) and wrote this code ('cause i naturally didn't trust the answers when everyone who is doing those tests online is selling glasses which are possible only in theory): --- Code: ---<?php srand(); $kitty = rand(0, 99); //Background colors $bgr = 255; $bgg = 255; $bgb = 255; //Foreground colors $fgr = 0xF4; $fgg = 255; //1111 1100 $fgb = 255; ?> <html> <head><title>Colors</title></head> <body style="<?php printf("background-color: #%02x%02x%02x; color: #%02x%02x%02x;", $bgr, $bgg, $bgb, $fgr, $fgg, $fgb);?>"> <?php printf("%d", $kitty); ?> </body> --- End code --- Supposedly my red is more sensitive than my green (or that they're equally sensitive). So what i did was do a binary search on green to find out where i last couldn't see the number (0xF4, whereas i could read it at 0xF3), then slowly backtracked on red (since it was so close to 0xFF on green) and stopped at 0xF4 since clearly i wasn't getting anywhere. Now, potentially i'm red colorblind, but we're supposed to see more green than read. Those sites are trying to sell glasses. My girlfriend who's eyes aren't that great (she been diagnosed with everything except colorblindness) I had tested with the same screen (important to do), and it would seem I see green better than her. Now, while it is possible that I see everything better than her (likely, actually), it's quite clear that if i am colorblind, it's way too acute. Something else to note: the test never bothered to have some sort of calibration for my screen coloring. Although my method didn't, either, I also had another person to test my results against. So, the logical conclusion is, that beautiful gloss tied with the tiny size of those bands (and i don't have magnifying glasses) had me unable to distinguish between the colors when the more obvious glare was shining back at me. In the future, i'm going to snap pictures of them with my tablet (so that the glare will appear white instead of blinding), which should make it easier, and which i should have done in the first place. |
| The Soulman:
Under what light did you read the resistors? "White" led's aren't white at all just a very poor rgb mix screwing up colors beyond recognition. Regular light bulbs are much better or try daylight. :) |
| IanB:
--- Quote from: Kohlrak on November 26, 2017, 12:27:21 am ---none of the resistors are supposed to have a 5 or 6 as a second digit --- End quote --- I doubt that. You are likely to have 15 and 56 in your collection. |
| Russ:
From my textbook. |
| IanB:
--- Quote from: Russ on November 26, 2017, 03:53:22 am ---From my textbook. --- End quote --- And? |
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