GroupDIY

General Discussions => The Lab => Topic started by: matta on May 25, 2005, 07:48:10 AM

Title: Resistor Variance?
Post by: matta on May 25, 2005, 07:48:10 AM
Hey Guys,

I?m building another Green and am using all 1% 1/4W Resistors this time,
most of the resistors have come within that 1% variance except my 10K?s
which measure in at between 9.7 and 9.6K, from a batch of 20 resistors. Is
it still safe to use these in the Green, even though it is less than a 1%
Variance from 10K? How specific does one need to get?

Thanks

Matt
Title: Resistor Variance?
Post by: gyraf on May 25, 2005, 08:28:35 AM
Are you sure your DMM is accurate to that tolerance in that range?  :razz:

(other than that, you probably won't need absolute accuracy - but relative accuracy. So if they don't differ too much from each other, it shouldn't be a problem anyway)
Title: Resistor Variance?
Post by: matta on May 25, 2005, 09:02:30 AM
Hah hah!

I see what you mean ;-)

What I meant was that of the 20 resistors I tested some were 9.6 and others
were 9.7K, but none were 10K. I see how funny my previous post looks now and
no my DMM is not that accurate ;-)

I assume as long as say I used 10 9.7K?s in place of 10K I should be fine?

Cheers

Matt
Title: Resistor Variance?
Post by: gyraf on May 25, 2005, 10:42:42 AM
Yup..
Title: Resistor Variance?
Post by: CJ on May 25, 2005, 02:39:50 PM
Make sure your hands are not touching the probes when measuring 10K and above.
Title: Resistor Variance?
Post by: matta on May 25, 2005, 02:44:00 PM
Hey Guys,

Thanks. Jakob matched them as best I could and CJ, I learnt quickly that my fingers change things... darn human parts, LOL!

Cheers

Matt