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Old 15th Jul 2017, 3:12 pm   #1
ITAM805
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Default Resistor confusion

what does the team think the value of this is please? There's 2 on the board, this one reads 270k, t'other open

many thanks
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Old 15th Jul 2017, 3:15 pm   #2
KeithsTV
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Default Re: Resistor confusion

Brown, black, black, yellow with a brown tolerance band . I'd say it was 1M 1%. Did you measure the 270k with it in circuit?

Keith
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Old 15th Jul 2017, 3:18 pm   #3
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Default Re: Resistor confusion

Yep, I'd read that as 1M 1%
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Old 15th Jul 2017, 3:20 pm   #4
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Default Re: Resistor confusion

Ditto.

Lawrence.
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Old 15th Jul 2017, 3:28 pm   #5
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Default Re: Resistor confusion

thanks guys. Keith, yes 270k in circuit
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Old 15th Jul 2017, 3:54 pm   #6
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Default Re: Resistor confusion

Looks like there's a parallel circuit causing the lower resistance. Try lifting one end and re-measuring.

Keith
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Old 15th Jul 2017, 4:38 pm   #7
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Default Re: Resistor confusion

Thanks Keith. I admit that value had me foxed, I still read resistors in 'old money' !
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Old 15th Jul 2017, 5:24 pm   #8
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Default Re: Resistor confusion

This is a handy site for us old'uns. Just select the number of bands. The tolerance band is the wider spaced one. Several other conversions as well.
https://www.digikey.co.uk/en/resourc...or-code-4-band
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Old 15th Jul 2017, 5:41 pm   #9
Craig Sawyers
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Default Re: Resistor confusion

Resistors (through hole ones) are now so small and have so many bands I have to use a magnifying glass to read them.

And even then there can be ambiguity. Brown black black brown brown can be 1k (brown black black brown) 1% read one way, and 110 ohms (brown brown black black) 1% read the other. Although the brown 1% tolerance band ought to be wider than the value colours, it is often not clear. So after using a magnifying glass I then use a DVM to measure the darned thing to eliminate possibility of error.

And don't get me started on the cryptic labeling of surface mount parts....

Craig
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Old 15th Jul 2017, 6:26 pm   #10
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Default Re: Resistor confusion

Recently bought some of these - 1MOhm. The way I see modern ones is an extra number band with standard multiplier so 100 with 4 zeros - 1MOhm.

My 10MOhm are brown, brown and black with green multiplier - 100 and 00000.


My 10 kOhm are brown, black and black with red muliplier - 100 and 00

That way it just seems like the old method with an extra band.


I do agree that the banding is not easy to read though
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Old 15th Jul 2017, 7:40 pm   #11
Amraduk
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Default Re: Resistor confusion

Quote:
Originally Posted by ionburn View Post
My 10MOhm are brown, brown and black with green multiplier - 100 and 00000.
Those colours actually give 11MOhm.I suspect they should have been:
Brown, black, black and green.

Regards,

Dave.
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Old 15th Jul 2017, 8:05 pm   #12
Philips210
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Default Re: Resistor confusion

Hi.

For most of used to the old 4-band system it certainly can cause confusion trying to interpret the 5-band and 6-band codes. With the old 4-band system it was so easy to recognise values quickly. We got used to the third band multiplier, black (tens of Ohms), brown (hundreds of Ohms), red (thousands of Ohms), orange (tens of thousands of Ohms) etc.

It definitely takes longer to decide the correct value with the 5 and 6-band codes.

Regards
Symon.
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Old 16th Jul 2017, 7:03 pm   #13
ionburn
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Default Re: Resistor confusion

Quote:
Originally Posted by Amraduk View Post
Quote:
Originally Posted by ionburn View Post
My 10MOhm are brown, brown and black with green multiplier - 100 and 00000.
Those colours actually give 11MOhm.I suspect they should have been:
Brown, black, black and green.
Sorry my mistake - I meant to say the latter
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Old 17th Jul 2017, 1:02 pm   #14
Herald1360
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Default Re: Resistor confusion

It gets even more interesting with proper E96 1% or E48 2% resistors when the second two bands are totally "unexpected" colours. 29.8 ohms would be red white grey gold brown for instance, though at least that would be a nonsense read backwards, unlike say 120R vs 10k.
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