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reddish75 9th March 2008 12:29 PM

dummy load
 
hi guys whats the best way to build a dummy load?

thanks
chris

mag 9th March 2008 12:42 PM

Depends on which resistance you need and how much power you need.

For instance I am using 14 resistors in parallel, every resistor is 56ohm 10W to give me a load of 4ohm 140W.

When I use it for really high power I put the resistors in a can full of water. When you use 300W or more you see the water boiling :hot:

It is good for short power tests but of course not for continuous load at more than 50W.

EUVL 9th March 2008 12:55 PM

http://www.diyaudio.com/forums/showt...98#post1072498


Patrick

Original Burnedfingers 9th March 2008 01:45 PM

2 Attachment(s)
Pictures of small dummy load

Original Burnedfingers 9th March 2008 01:46 PM

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front

Name covered up to prevent spam.

Unit has two EBG type UXP/600/9 4 ohm resistors rated at 600 watts each.

Unit has switch for 4 or 8 ohm load and right or left channel monitor.

Original Burnedfingers 9th March 2008 01:57 PM

2 Attachment(s)
Picture of big load

4 EBG 600 watt load resistors per channel in a series parallel for a 4 ohm load per channel. The unit can also be used as one massive 8 ohm load if needed for large bridge amplifiers. It is cooled by 3) 5" Dayton 70 CFM fans and never gets warm no matter what.

Original Burnedfingers 9th March 2008 02:00 PM

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picture

Original Burnedfingers 9th March 2008 02:04 PM

UXP SERIES Power Resistor


EBG has developed a small unique package (60 mm x 65 mm) that can handle up to 960 Watts continuously when mounted to a heatsink with a bottom case temperature of 70C at full power. They have 3 different models available; 300W, 600W, and 800W, all using the same unique packaging. The catalog power ratings are all shown for an 85C bottom case temp, however if you are able to keep the bottom case at 70C you can acheive a 20% increase in the continuous power capability. This resistor was designed for the high-speed trains in Europe, but is one of the fastest growing lines here in North America. This patented package offers electrical advantages as well as physical advantages. The ohmic value range begins at 0.5R up to 1M. The dielectric strength can go as high as 12 kVrms and the partial discharge up to 7kVrms < 10pC for 30 seconds. Although the standard terminal heights are offset at 30mm and 32mm there are many other terminal heights and options available. Easy mounting with 2 screws to the heatsink is also an advantage to our UXP series as it has an internal calabration to apply equal pressure to the heatsink with only those 2 mounting screws. This thick film resistor can save your company time and money. Check their detailed spec sheet or call them for many additional options not listed.















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Tarzan 9th March 2008 08:24 PM

hi, What do these resistors cost?

Bonsai 10th March 2008 01:49 AM

You can also use electric kettle elements. Typically about 2 2 Ohms, so is you wire 3 in parallel you get 7.3 Ohms.

Good for about 6KW when immersed in Water

:D


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