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November 26, 2020, 09:58:36 PM

Author Topic: PC Board resistor  (Read 1222 times)

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Offline Alonzo

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PC Board resistor
« 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
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Offline Paul Birkeland

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Re: PC Board resistor
« 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

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Offline mcandmar

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Re: PC Board resistor
« 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

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Re: PC Board resistor
« Reply #3 on: December 21, 2014, 04:17:19 PM »
The 0 Ohm resistor just acts as an insulated jumper. 
Paul "PB" Birkeland

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Offline Alonzo

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Re: PC Board resistor
« 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
BS Node to Gungnir>
BeePre>845 amp>Altec 414z, Kaiju>GPA 802-8G on Jabo horns, 45 Stereomour I> APT super tweeters
Saga>Vidar>PE subwoofers
SR-45 amp>HD800
Stat amp>Koss ESP/95
Garage: RPi4 to BiFrost>Stereomour I>Altec 299-8A w/MRII horns and Stereomour II to Petite Onken clones

Offline Paul Birkeland

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Re: PC Board resistor
« 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

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Re: PC Board resistor
« Reply #6 on: December 21, 2014, 06:08:46 PM »
Ok, Great!
Alonzo
BS Node to Gungnir>
BeePre>845 amp>Altec 414z, Kaiju>GPA 802-8G on Jabo horns, 45 Stereomour I> APT super tweeters
Saga>Vidar>PE subwoofers
SR-45 amp>HD800
Stat amp>Koss ESP/95
Garage: RPi4 to BiFrost>Stereomour I>Altec 299-8A w/MRII horns and Stereomour II to Petite Onken clones