I have some blown current sense resistor and I don't know how to figure out the value of it. Resistor is blown so I cannot measure it.
Well, I know about standard rules, unfortunately none I know applies to this.
Color bands are quite symmetrically spaced, and the silver band is in the middle.
Colors:
orange (or red?), green, silver, black (thicker), green (thicker)
I assume 1st and 2nd band is for value, 3rd is multiplier, 4th is tolerance and 5th is TCR.
Someone suggested that thicker bands represent tolerance and TCR.
Then it would be 0.35Ω, but black color is not specified for tolerance and green is not specified for TCR.
When I reverse order:
green (thicker), black (thicker), silver, green, orange (or red?)
Then it would be 0.5Ω, ±0.5%, 15ppm
Which one is correct? Or what is the correct procedure and value?
Best Answer
Color code standards are defined in IEC 60062. See also wikipedia: Electronic Color Code
Generally speaking, the first, second [,third] band represent a digit each, followed by a multiplier, tolerance [, temperature coefficient]. Third digit and temperature coefficient are both optional. Given that gold cannot represent a digit (but only multiplier or tolerance), you have:
digit, digit, multiplier, tolerance, temp.coefficient.
Black has no tolerance assigned, which makes it the second digit in your case.
Applying this to your resistor leads to: 5 | 0 | 0.1 | 0.5% | 15ppm/K
Thus, you want a 5 Ohm resistor.EDIT: It's 0.5 Ohm (multiplier 0.01), given that the middle band is silver (as stated in the question). It looked golden to me, but it's difficult to tell from the picture. However, the above applies to 'silver', where I've referred to 'gold'.