Something For The Fuse Guys ...
Talking about fuse directionality, Hifi Tuning has a logo with a diode symbol in it. At some point people began believing this diode-arrow was the factory tested recommended direction of the fuse. But it was not, it is just a logo. Personally I do hear a difference in a direction, but I also believe it diminishes after some power on. |
HiFi Tuning started off claiming that fuses break in correctly no matter which way they were first inserted. But later, about the time they had an independent testing company look into directionality of fuses, they changed their tune, as it were, after the results of the testing, including listening tests, was completed.The results of the tests appear on the HiFi Tuning website as the so called Data Sheets, which shows measurements of voltage drop across various fuses, both directions, including HiFi Tuning fuses, with and without Fuses were tested in both DC and AC circuits. http://www.hifi-tuning.com/pdf/wlfr.eng.pdf |
The GECOM technologies document is not a proper report of a metrology testing lab, this is purely a marketing document and an auspicious one at that. Let's point out the BS in the document: 1) No listing of equipment is provided, no pictures of test setups, nothing. Just take our word for it on the testing. You and I know, that is not how testing labs operate. Every test has a full equipment list and normally pictures. 2) The resistance difference "claimed" from direction 1 to direction 2 is on the order of 0.0001 to 0.00005 ohms, and the claim in some cases represents 0.05% difference at 2-3 milliohms. Check out their accuracy page. They can't even measure to that accuracy at those resistances .... and they are claiming to be able to repeat it in both directions? 3) Copper resistance has a temp coefficient of ~ (3.8* 10^-3)/C, silver similar at room temp. That means a change of 0.38% in resistance value per degree C ... and yet they claim in their report to measure resistance changes to an accuracy of 0.05 - 0.1% or the change that would occur with a 0.25 celsius temp difference. I am calling BS .. super big time BS. There is 0 chance they temp controlled in that lab (see pictures - not a proper metrology lab) to that accuracy, AND they would need to use pulse measurements to eliminate self-heating (no mention), which means on time would have huge impact due to self-heating of the fuse temperature. (p.s. also means that the temperature of your wires in your audio system has way more system impact) 4) They talk about Vector Impedance measurements, but don't claim the HiFi is the best for those (like every other one) ... and curiously the mentioned table of results is missing. 5) Their "noise increase" is not nearly well defined enough to be meaningful. Increase over what as a start. OH, and this is the best one. You can guarantee every piece of equipment they use has a garden variety fuse in it, is powered with a cheap power cord, and is connected to a rather garden variety power bar. But sure george, you use these worthless results to try to justify your position. geoffkait17,710 posts10-25-2019 5:48am http://www.hifi-tuning.com/pdf/wlfr.eng.pdf |
roberttcan" GECOM technologies document is not a proper report of a metrology testing lab, this is purely a marketing document and an auspicious one at that. Let’s point out the BS in the document: 1) No listing of equipment is provided, no pictures of test setups,’ That is very funny you are attacking this detailed, authoritative, informative report because it does not have pictures! The report does not include all of the background information because that is consistent from study to study and is otherwise available there is no need to report it individually for each study what is obvious here is that once someone comes out with actual data you shoot it down but you have no data yourself to supplant it even though you claim to have actual done extensive research and studies to support the millions of electronic devices you claim to have manufactured. |
