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Old 03-30-2014, 02:27 AM
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Default The Resistor Bank Test Board: The Final Chapter

Finally wrapped up the test board build! What I thought was going to be a simple resistor bank build ended up taking on a mind of its own and ended up becoming a test board. Either way though I was sick of this build I am glad I did it. For those of you tuned in thank you and here is the conclusion:


1st we had to get lead wires from the bank to the connecting studs. Nice healthy 12 gauge. Terminals on, rings connected. Mock up on board in addition to the gauges.














Laid down the lines for the B+ and Ground dist blocks. Then drilled out pilot holes





Take it to paint!:



1st the Fan install:





Now it’s time for the gauges. From top to bottom, Volt, Volt, Temp, Amp:









Install temp Probe in resistor bank:





Attach Bank to board and pull through temp probe wires:



Now start running leads through the test board to the back:








Install connecting studs, bridging straps and nuts:












Time to connect leads to studs:









Attach power, ground and battery trace:









Lay it out and look it over:







Now that that’s done comes the solution to turning on the meters. I could have gone with simple rockers or toggles but I chose a $20 solution to a $2 problem! This is a 4 way power distribution hub. The temp meter and fan will be wired directlt to this via button 1 nd 2. Since the volt meters are tapped directly to the sources I want measurements from they will be a negative trip which means I need two relays. Could have used one but why make it easy? lol:



Install the hub and start wiring:














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Old 03-30-2014, 02:28 AM
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And more wiring:
















After the wiring is done, clean it up:













Call it a wrap!!!:







Resistor Bank Test Board Teaser #1 - YouTube

Resistor Bank Test Board Teaser #2 - YouTube

Mounted to the test bench - YouTube
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Old 03-30-2014, 04:03 AM
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What does this do exactly?
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Old 03-30-2014, 04:39 AM
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Wow thats cool man.

@Ktmrida it's to measure an amplifiers power. People are starting to realize tht clamping amps gives bs ratings.
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Old 03-30-2014, 04:53 AM
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load testing speaker outputs without a sub/speaker. personally, i would have a gauge for ac output with banana pins and common banana/spring, or banana/twist binding posts, as amps are not really needed, but i suppose just using the alligator clips on a meter works, too, lol. looks clean bro. first thought is that the heatsink would serve better for one of my chipped rockfords, but it's nice to be able to show it off on the bench, too "eye candy"
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Old 03-30-2014, 04:54 AM
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Quote:
Originally Posted by Novicaine View Post
Wow thats cool man.

@Ktmrida it's to measure an amplifiers power. People are starting to realize tht clamping amps gives bs ratings.
how is clamping a bs rating if you do it right?
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Old 03-30-2014, 07:35 AM
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Are the resistors mounted to plexi and not the amp chasis directly?
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Old 03-30-2014, 08:05 AM
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Very clean and well thought out.
Great pics too!
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Old 03-30-2014, 09:24 AM
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Just judging by the amount of work that went into this project I am sure that this guy did his homework.... Nice job for sure
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Old 03-30-2014, 09:29 PM
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Quote:
Originally Posted by akheathen View Post
how is clamping a bs rating if you do it right?
Only a purely resistive load will have a 100% power factor on any frequency tested. Whenever you clamp power using typical methods, you are calculating volt-amperes, not watts. If the voltage and current are really really out-of-phase you could measure, for example, 1000 volt-amperes but at a 25% power factor, hence really only 250 watts. In very very rare circumstances, people who clamp woofers have close to 100% power factor, but most do not. Actually you can assume, other than for the sake of comparison relative to other woofers/amplifiers in the same vehicle tested on the same frequency on the same electrical (like how T Fade uses his same car and similar woofers/boxes to clamp different amps for the sake of relative tests), that most clamp tests are more of a waste of time than useful tests.
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