Bottlehead Forum

Bottlehead Kits => Legacy Kit Products => Smash => Topic started by: Alonzo on December 21, 2014, 03:37:00 PM

Title: PC Board resistor
Post by: Alonzo on December 21, 2014, 03:37:00 PM
Getting along on my Smash build, my .27 ohm resistor reads .6 ohms (shorting my Fluke reads .1).  I put it in anyway assuming it was Ok but thought I'd ask since it's almost 50% out.  Will it make much of a difference in the filament voltage?
Title: Re: PC Board resistor
Post by: Paul Birkeland on December 21, 2014, 03:42:23 PM
It can be very, very, very hard to measure low resistances like that, even factoring in the meter lead resistance. 

What does your meter say when measuring the 0 Ohm resistor supplied?
Title: Re: PC Board resistor
Post by: mcandmar on December 21, 2014, 03:54:57 PM
My Fluke meter (175) has a resolution of .1ohm with an accuracy of ±(0.9% + 1) so a couple of ohms is the practical limit you can measure down to.

P.S. Never heard of a 0 ohm resistor before, whats that do for you?
Title: Re: PC Board resistor
Post by: Paul Birkeland on December 21, 2014, 04:17:19 PM
The 0 Ohm resistor just acts as an insulated jumper. 
Title: Re: PC Board resistor
Post by: Alonzo on December 21, 2014, 04:20:38 PM
The 0 ohm measures .1 ohm, which is my zero since I get .1 ohm shorted.
Title: Re: PC Board resistor
Post by: Paul Birkeland on December 21, 2014, 04:41:42 PM
Yeah, I wouldn't worry too much about it.  Oils from your fingers, oxides on the resistor leads, etc. are going to influence this low of a resistance reading.

If your voltage checks end up being off, let us know and we can revisit that resistor.

-PB
Title: Re: PC Board resistor
Post by: Alonzo on December 21, 2014, 06:08:46 PM
Ok, Great!