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Power load, dummy load (pic)
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Old 3rd August 2007, 10:49 PM   #11
luka is offline luka  Slovenia
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Power load, dummy load (pic)
Hi

Not bad, not bad at all, just price couldn't be low, is it?
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Old 4th August 2007, 04:44 AM   #12
OzMikeH is offline OzMikeH  Australia
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Cantenna can use clean engine oil. Mineral oil is better, like baby oil.

Sealing it is actually a very bad idea, it gets hot in use and the lid pops off and makes a mess. I found out the hard way....
A small (1 litre) Cantenna is better, It is much more portable and if you need more power you put it in a bucket, the sink or even the bath.

I suggest soldering a thread onto the top of the can with a removable cap to allow it to breathe when in use.

For big AC power supplies & UPS I use a 10 amp variac with an electric kettle.

For a fixed current load for discharge testing 24V battery packs I made a 7810 voltage regulator feeding a 10 ohm resistor.
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Old 4th August 2007, 05:12 AM   #13
anatech is offline anatech  Canada
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Power load, dummy load (pic)
Hi Mike,
Quote:
I suggest soldering a thread onto the top of the can with a removable cap to allow it to breathe when in use.
For sure. Just make sure it is sealed when not in use. You haven't lived until you have to clean this mess up from your electronics bench.

-Chris
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Old 4th August 2007, 07:28 AM   #14
luka is offline luka  Slovenia
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Power load, dummy load (pic)
Hi

You see. That why I don't wan't anything liquid on my bench, like water or oil Power resistors with forced air seems at this point to be better choise...
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Old 4th August 2007, 07:35 AM   #15
luka is offline luka  Slovenia
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Power load, dummy load (pic)
Hi zeonrider

Have you run your power resistor at some higher power level for any longer period of time, so that it did heat up a lot? I am thinking of using same lab sockets, which are rated around 80-100 degrees. I worrie what if air inside generated by resisotors will be 300, then over time case will heat up to that temp. too, melting plastic. Did you have anything like that in your case, or it doesn't heat up that much?

And what is that red thing around sockets?
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Old 4th August 2007, 10:28 AM   #16
cliffforrest is offline cliffforrest  United Kingdom
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2 channel 8 ohms (other channel on the hidden side.)

I just use a jumper for 2 or 4 ohms.

2 x 100W for a minute or so is no problem.
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Old 4th August 2007, 01:16 PM   #17
wine&dine is offline wine&dine  Austria
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Quote:
Originally posted by gmphadte
Two plates immersed in salt water can be used as a dummy load for high power.
Indeed, if you have use for the chlorine that gasses out. Your lungs and most anything organic around you (the dreaded "enviroment") don't.
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Old 4th August 2007, 01:21 PM   #18
Juergen Knoop is offline Juergen Knoop  Germany
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open a window!
nevertheless, mains connected saltwater tubes were used as heaters once
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Old 4th August 2007, 03:37 PM   #19
wine&dine is offline wine&dine  Austria
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Quote:
Originally posted by juergenk
mains connected saltwater tubes were used as heaters once
X-rays were used to fit shoes once.
Asbestos was used in brake discs once.
Mercury was used to "cure" syphilis once.

... and Chlorine was used to kill enemy troops once.
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Old 4th August 2007, 04:04 PM   #20
Juergen Knoop is offline Juergen Knoop  Germany
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massdevelopment of chlorine is limited to DC, in case the saltwater is used as AC-load only, there may be small amounts of chlorine escaping the water
if this leads to a dangerous level in a well vented enviroment, is at question.
I suppose saltwater is a bad dummy load for amplifiers, because of the large! tempco, the frequency behaviour and whatever.
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