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Originally Posted by Clodfobble
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That is a power supply tester. It cannot report a good power supply. It is at best what is called Go-Nogo tester. Even in quality as taught by Deming, that would be an undesireable device. It can identify some defective power supplies - not all. Required is a device that reports good or bad with no doubts.
That tester provides no numbers. To properly load a power supply, a tester must be as hot as four light bulbs in one package - way to hot to handle. Obvously, the tester applies no such load. That power supply tester even has no other useful purposes. A power supply tester for maybe $10 will never accomplish what a $20 3.5 digit multimeter can accomplish. Most obvious difference: a useful diagnostic tool provides numbers.
Avoid the power supply tester as if it was a disease. It does only slightly more than the paper clip described earlier. Defined was a defective power supply that can still boot a computer. Power supply tester would declare that defective supply as good.
The recommended 3.5 digit meter for $20 is sold in Lowes, Radio Shack, Sears, Home Depot, Tru Value Hardware, K-mart, and Ace Hardware. Last time I looked, it sold for $16 in Walmart. The tool is that universal and has numerous other useful functions.
Power supply must cost about $60 retail. Critical functions are often missing in supplies selling for less. Last time I looked, every replacement supply selling in CompUSA did not meet minimum requirements. The power supply market is ripe with dumping because a power supply manufacturer need not meet industry standards. The computer assembler must know of and is responsible for meeting those standards at the system level. Why bother including all functions when the customer assumes all power supplies are identical? Ironically, profit margins on some cheaper supplies may even be higher. That much is sometimes missing inside a supply.