Overclock3D improves its PSU testing equipment
2009 - Year of the PSU!
Published: 13th January 2009 | Source: Overclock3D |
Back in April of 2006 , Overclock3D embarked on it's first PSU review. Determined not to go down the "plug it in, take some readings" route, initial load testing was performed using a carefully selected assortment of high wattage lightbulbs to place heavy loads on the +12v rails. It soon became clear that this setup was far from idea with the fragility and heat of the bulbs posing serious safety issues along with a total inability to test the +3.3v and +5v rails or make small adjustments to the load settings.
This setup was quickly replaced by a series of power resistors capable of placing loads on each of the three main PSU rails (+3.3v, +5v & +12v) while also allowing load adjustments of around 5 amps on each of the rails simply by adding/removing resistors from the circuit. For almost two years this became our main testing platform with various improvements being made over time including the ability to place up to a 100 amp load across several rails along with loads of up to 40 amps on the +3.3v and 5v rails. The entire system was encased in a large steel box complete with high power fans and CPU heatsinks on each of the power resistors to help keep under control the 230°C temperatures that they could reach when not actively cooled.
Unfortunately (or maybe fortunately?) in July 2008 the cooling system in the load tester was accidentally switched off during the testing of a PSU and the entire system subsequently overheated and went 'BANG'. Since then we've avoided performing any PSU reviews (apart from the odd one or two performed at Enermax's old Milton Keynes offices) until we could obtain a professional ATE load tester that would help us take our PSU reviews to the next level. Today that very item arrived on our doorstep:
Seen above is our brand new SunMoon SM-268+ ATE load tester capable of placing a sustained load of 1690w across a total of six rails (including +5vsb and -12v) on any ATX PSU. Unlike our previous resistor based load tester the SM-268 gives us the ability to adjust amperage loads in increments as small as 0.01a while also measuring voltages and wattage readings on-screen. When connected to a PC the SM-268 has a full software suite that can effectively remote control the unit, making fully automated testing possible while also being able to output the test results to a printer.
Of course, having only spent one day with the SM-268 so far we're still really getting to grips with what it's capable of, and with an Oscilloscope on its way down to us too, it's certainly going to be a steep learning curve. However, over the next few weeks we will perfect and document our new PSU testing procedures and begin bringing some of the most accurate PSU reviews to your screens!
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Most Recent Comments
Some quick digging into it,the pcb track would have to be aleast 57mm wide and then it depends of the copper substrate of the pcb sheet. Would it be wiser to make a form of flylead for connecting PSU to Test Box.
Pricey bit of kit, well over £1000? If it didnt come with a wheel at that price...
:D
:D
Pricey bit of kit, well over £1000? If it didnt come with a wheel at that price...
:D
Yeah, I could have easily bought a fairly nice OC3D company car instead :'(
I think i have a pcb etching kit that i could have :D
if you would like it
if you would like it
Think it would be wise to scrap the PCB idea. The tracks would not be up to those currents and anything like that would only add room for error and inaccuracy.
To put it into perspective, cooker cable that goes into the mains is 30 amp, standard mains wire is 13 amp. You would need to use the highest gague cable you can find made from the highest quality copper. High performance audio cable would be a good place to look, if you can find some in the 40amp area lol. The connectors would also have to be high quality and very well fitted. Maybe worth scouting for some choc blocks that are rated for like 100 amp and use them to make a crude but effective circuit :)
To put it into perspective, cooker cable that goes into the mains is 30 amp, standard mains wire is 13 amp. You would need to use the highest gague cable you can find made from the highest quality copper. High performance audio cable would be a good place to look, if you can find some in the 40amp area lol. The connectors would also have to be high quality and very well fitted. Maybe worth scouting for some choc blocks that are rated for like 100 amp and use them to make a crude but effective circuit :)
http://www.overclock3d.net/articles.php?/power_supply/overclock3d_improves_its_psu_testing_equipment/1
Homepage article up :)
It's jims little baby :D :D
It's jims little baby :D :D
Hell ye. Nothing quite bringing even the most beastly of PSU's to their knees :p
Nice to see a PSU tester capable of taxing even the most powerful units out there. It'd be good to see a 1500W unit tested all the way. Nice bit of kit.
CSS Valid
The idea behind it is mostly to avoid me plugging PSU's directly into the load tester all the time as eventually something will break.
What i'd rather do is have a PCB full of binding posts on one side so I can connect most of the load tester outputs up to the PCB and then from the PCB have another set of molex/sata/pci-e connectors.
It will also allow me to convert that single PCI-E connector on the unit into 4 or more PCI-E plugs on the PCB.