Odp: [sdiy] really basic question .. tolerance

[Tim Curtis]

On a related topic...

I've never really been all that up on what the actual differences are 
between metal film and carbon film resistors.  Can anyone give me some 
insight?

I'm assuming that there's more to it than just the tolerance.

I've got a board that I'm populating here that specifically calls for 1% 
metal film resistors, but I've got a really good stash of 5% carbon 
films here.  I'm planning to order about 10 different values of the 
1%'s, but is there a reason that I can't just select 5% carbons that are 
actually within the 1% spec?

Thanks!

Tim



Roman Sowa wrote:

>Some resistor manufacturers claim that every resistor going onto
>the reel is measured. This way it's easy to guarantee that all
>resistors on that reel fit within given tolerance.
>This way they probably select 1% and 0.5% from the same
>production run I guess.
>OTOH if others don't measure every resistors before packing
>they can only guarantee some statistical parameter like "2-sigma
>or whatever" depending on stability of manufacturing process.
>
>I never worked in resistor fab, I just assume that reading
>datasheets.
>Yeah, I'm so geekily twisted I even read resistor's datasheet
>
>Roman
>
>----- Original Message -----
>From: Ian Fritz <ijfritz at earthlink.net>
>To: harrybissell <harrybissell at prodigy.net>; John L Marshall
><john.l.marshall at gte.net>
>Cc: diysynth <diy_list at analog-synth.de>; <synth-diy at dropmix.xs4all.nl>
>Sent: Sunday, January 19, 2003 12:59 AM
>Subject: Re: [sdiy] really basic question .. tolerance
>
>
>  
>
>>Um ... I still have a question.
>>
>>When I buy a 1% resistor is its value guaranteed to be within 1%, or is it
>>just that some point on the statistical distribution ( the 2-sigma point or
>>whatever) is at 1%?
>>
>>I've always assumed the former, but is
>>this correct?
>>
>>   Ian
>>
>>
>>At 04:34 PM 1/18/2003, harrybissell wrote:
>>    
>>
>>>Yep... I'm in
>>>
>>>H^) harry
>>>
>>>John L Marshall wrote:
>>>
>>>      
>>>
>>>>We all agree. I think.
>>>>
>>>>Take care,
>>>>John
>>>>www.sound-photo.com
>>>>        
>>>>
>
>
>
>  
>

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