PC Board resistor

Alonzo · 1943

0 Members and 1 Guest are viewing this topic.

Offline Alonzo

  • Sr. Member
  • ****
    • Posts: 460
  • Not all those who wander are lost
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?

Alonzo
Gameroom:>Mainline to HD820, SR45 to Pipette
>BeePree Kaiju & SII to Altec 19 knockoffs
Office:>BH Stat amp to Koss 95x, T20 SET to JBL 4309s
Den:> MorePlay 845 SET to Altec Valencia's


Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19319
Reply #1 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?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline mcandmar

  • Hero Member
  • *****
    • Posts: 1599
  • Not all engineers are civil
Reply #2 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?

M.McCandless


Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19319
Reply #3 on: December 21, 2014, 04:17:19 PM
The 0 Ohm resistor just acts as an insulated jumper. 

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline Alonzo

  • Sr. Member
  • ****
    • Posts: 460
  • Not all those who wander are lost
Reply #4 on: December 21, 2014, 04:20:38 PM
The 0 ohm measures .1 ohm, which is my zero since I get .1 ohm shorted.

Alonzo
Gameroom:>Mainline to HD820, SR45 to Pipette
>BeePree Kaiju & SII to Altec 19 knockoffs
Office:>BH Stat amp to Koss 95x, T20 SET to JBL 4309s
Den:> MorePlay 845 SET to Altec Valencia's


Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19319
Reply #5 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

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline Alonzo

  • Sr. Member
  • ****
    • Posts: 460
  • Not all those who wander are lost
Reply #6 on: December 21, 2014, 06:08:46 PM
Ok, Great!

Alonzo
Gameroom:>Mainline to HD820, SR45 to Pipette
>BeePree Kaiju & SII to Altec 19 knockoffs
Office:>BH Stat amp to Koss 95x, T20 SET to JBL 4309s
Den:> MorePlay 845 SET to Altec Valencia's