Author Topic: Why is silver band in the middle of these 5 band resistors ?  (Read 1685 times)

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Offline lordvader88Topic starter

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Why is silver band in the middle of these 5 band resistors ?
« on: April 22, 2018, 04:43:17 am »
I'm looking at 2 low value resistors that look wire wound around a 2W pink ceramic-finish looking resistor

Colors to numbers are
52silver41 or 14silver25 ?
52silver21 or 12silver25 ?

So why's silver in the middle ? All the other 5 band resistors I have aren't like that
 

Offline Canis Dirus Leidy

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Re: Why is silver band in the middle of these 5 band resistors ?
« Reply #1 on: April 22, 2018, 05:12:52 pm »
Most likely this is not a silver, but a white. The values of 14.9 and 12.9 kOhm exactly meet the E192 series.
« Last Edit: April 22, 2018, 05:20:39 pm by Canis Dirus Leidy »
 

Offline Twoflower

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Re: Why is silver band in the middle of these 5 band resistors ?
« Reply #2 on: April 22, 2018, 05:26:19 pm »
My wild guess would be that's not the correct answer ans a 2W E192 series doesn't match. Maybe in metrology, but I doubt that this is here the case. Also as Lorvader88 claims to be low resistance.

Can you take a decent picture of them and what device they came from?
 

Offline bitwelder

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Re: Why is silver band in the middle of these 5 band resistors ?
« Reply #3 on: April 22, 2018, 08:29:17 pm »
If the resistors are really low value as you guess, you should be able to measure them decently even if they connected to a circuit.
Have you tried that?
 

Offline glarsson

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Re: Why is silver band in the middle of these 5 band resistors ?
« Reply #4 on: April 22, 2018, 08:37:03 pm »
Silver in a band used as multiplier indicates x0.01.
Does 0.14 ohm +/-2% 20ppm/K and 0.12 ohm +/-2% 20ppm/K make sense?
 

Online Brumby

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Re: Why is silver band in the middle of these 5 band resistors ?
« Reply #5 on: April 23, 2018, 03:22:41 am »
Silver in a band used as multiplier indicates x0.01.
This was my first suspicion as well.

Quote
Does 0.14 ohm +/-2% 20ppm/K and 0.12 ohm +/-2% 20ppm/K make sense?
I'll second this.

If the resistors are really low value as you guess, you should be able to measure them decently even if they connected to a circuit.
Have you tried that?
Please do this and let us know.

Even in circuit, the answer will be helpful.
« Last Edit: April 23, 2018, 03:25:34 am by Brumby »
 

Offline lordvader88Topic starter

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Re: Why is silver band in the middle of these 5 band resistors ?
« Reply #6 on: April 23, 2018, 06:46:39 pm »
Silver in a band used as multiplier indicates x0.01.
Does 0.14 ohm +/-2% 20ppm/K and 0.12 ohm +/-2% 20ppm/K make sense?
Yeah silver for 0.01x for sure,

The 52silv21 reads as 0.20 or 0.27, it moves a lot. There r 2 in parallel are between negative of a 4pin rectifier, and GND-ref of the tank cap, for almost everything else HS on a CX600W SMPS.

the 52sil41 started at 0.60 and quickly dropped to 0.02 and shorting my BM869 gave 0.03 atm.

Could they be inductors ? There are beefy NTC thermistors or something right before the main tank cap, IDK maybe it's more inrush current limiting ?
 


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