- #1
iScience
- 466
- 5
hi, i just bought an inductor that was labeled 68mH, but the colors are violet gray brown silver. doesn't this make it 680uH (0.68mH)?
are you sure you read all the colors correctly?
in the future, use a 12VAC wall wart power source instead of the AC Mains please. No reason to be shocking yourself or others, or starting a fire...
Did you read its DC resistance beforehand?
Did your test change it?
How big is that thing?
Did the fuse blow?
Can you post the catalog
yupSet for AC amps?
yup, except, i had the meter on the I_max=20A setting, does this offer more resistance?jim hardy said:Test lead plugged into current measuring jack?
digital. is there something that varies between the two?jim hardy said:Analog or digital meter?
always! and thanks a bunch for your feedbackGlad you're having fun - this is the age of technology and we should enjoy it to the max.
iScience said:the store i bought it from looks like they haven't yet gotten their site fully up and running, but it was one of these kinds of inductors, except grey, violet, grey brown grey.
No, it offers less. There is an internal resistor and the meter measures the millivolts produced across it, calculates amps by Ohm's law and displays results. They size the resistor for each scale so that it's an easy conversion - like 200 millivolts for 2 or 20 or whatever amps, just move the decimal is all the calculation necessary...iScience said:yup, except, i had the meter on the I_max=20A setting, does this offer more resistance?
Well, digital meters are always plus or minus one count in the least significant digit.digital. is there something that varies between the two?
The color code on an inductor is used to indicate the inductance value of the component. This helps to easily identify the inductor and its properties.
The color code is read by assigning numerical values to each color band, which are then combined to give the inductance value in millihenries (mH). In this case, the first band violet represents the number 7, the second band gray represents the number 8, the third band brown represents a multiplier of 10, and the fourth band silver represents a tolerance of 10%.
The inductance value of this inductor is 68 millihenries (mH). The first two digits, 6 and 8, represent the numerical value of 68. The third band brown indicates a multiplier of 10, so the value is multiplied by 10 resulting in 680 mH. The fourth band silver represents a tolerance of 10%, so the actual inductance value could range from 612 mH to 748 mH.
The tolerance of this inductor is 10%. This means that the inductance value could have a deviation of +/- 10% from the indicated value of 68 mH. In this case, the actual inductance value could range from 612 mH to 748 mH.
The silver band on an inductor color code represents the tolerance of the component. In this case, the silver band indicates a tolerance of 10%, meaning the inductance value could have a deviation of +/- 10% from the indicated value of 68 mH.