I have trouble with finding out resistance of a resistor. It has 5 bands but somehow I cant get the code right.

enter image description here

  • 2
    \$\begingroup\$ Funny that it appears to cross what seems to be the isolation barrier. \$\endgroup\$ – pipe Aug 18 '18 at 8:06
  • \$\begingroup\$ it actually does cross isolation barrier, would that affect type of resistor? \$\endgroup\$ – Dean80 Aug 18 '18 at 8:22
  • \$\begingroup\$ Good question. I wouldn't think any resistor could cross an isolation barrier worth its salt - no matter its value. Maybe that information helps to identify it. \$\endgroup\$ – pipe Aug 18 '18 at 8:25

Here's my best attempt: -

enter image description here

  • 1st band is grey because the 2nd band can't be gold (see above) = 8
  • 2nd band is red hence = 2
  • 3rd band is green = 5

This makes the value 8.2 Mohm

The gold band makes it a 5% resistor and the final white band is the tricky one but I suspect it should be regarded as a "null" (or nil) band and meaningless as implied in this picture: -

enter image description here

The final white band could imply a 20% tolerance.

  • \$\begingroup\$ Hi Andy, that's what I thought as well, it's that white band which makes it a bit confusing. Do you think it might be temperature related or reliability? \$\endgroup\$ – Dean80 Aug 18 '18 at 8:03
  • \$\begingroup\$ @Dean80 I had considered that but I can find no evidence that that is the case. \$\endgroup\$ – Andy aka Aug 18 '18 at 8:11
  • \$\begingroup\$ white band might be just for reading indication, it seams to be slightly wider as well \$\endgroup\$ – Dean80 Aug 18 '18 at 8:18

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