vk_onfilter
Responses from vk_onfilter
| Any one measured the EMI/RFI attenuation performance of audiophile power conditioners? A note on input/output impedance: most measurements in RF domain are made in a 50 Ohms termination. Conducted (i.e. on wires) EMC test per regulations is also conducted with 50 Ohms termination. Appliance filters (this is the UL and IEC classifi... | |
| Any one measured the EMI/RFI attenuation performance of audiophile power conditioners? To answer @Audio phool's question (sorry for a long reply - didn't have time to condense it): =========================================================== QUESTION: "@vk_onfilter I saw the productline of your company which looks impressive & ... | |
| Any one measured the EMI/RFI attenuation performance of audiophile power conditioners? @tvad: Thank you for your kind words. Indeed, we supply EMI filters for very broad applications around the world (including Antarctica). Most of top U.S. universities (Caltech, MIT, U.C. Berkeley, and so on) use them in their R&D work. Quan... | |
| Power conditoner.. What you are describing is called "switchover" transient - in essence, there are at least three factors in play: a) synchronization issues between the sinewave (or as close at it gets with the generator) waveform and that of your AC mains, b) ramp... | |
| Power cord length On a most practical side, 8', or ~2.5m is one of the most standard power cable length, so it is simply easier for a manufacturer to harmonize on the standard length than to have a large inventory of different lengths that won't make any difference... | |
| Testing for Dirty Electrical Power Please see this article at inCompliance Magazine for EMC professionals: It is good to avoid "instant reward" measurements that produce results that mean very little. For example, converting EMI into audio signal would work only if the hi... | |
| Ground voltage!! Reverse Neutral and Ground/Earth is one of the common problems in wiring, would it be at home or at a factory. Outlet checkers as shown above don't test for this problem. There are ways to test for it, but you have to be quite familiar with elec... | |
| Conditioner vs. Surge protector Please take a look at this App. Note on MOV surge protectors: www.onfilter.com/protection-from-transients In short, MOVs do pretty well once their breakdown limit is reached (~400V and up for 120VAC systems, ~600...900V for 250VAC); they don'... | |
| How hot is too hot? Depending on the safety standard used for compliance of this unit the maximum temperature of operating device on the surfaces that a user can touch is 70 C (158 F) for metal and 95 C (203 F) for non-metal surfaces. That's pretty hot, so a prudent... | |
| If Power Cords Don't Matter... The weakest spot of power cables is not the wire itself, and not the power plug or the inlet plug, but the termination of wire to either of them and the mating resistance. It is seldom done right and at full load these connections heat up quite a... | |
| Over loading? Some math and other things:a) If the specification for your amplifier does not clearly state the AC peak current, take rated max. audio output power per channel, multiply by 3 (efficiency of Class A amplifier is ~30% - the worst case), and divide ... | |
| How To Do You Measure the Quality of Your AC Power? EMI: Time domain (i.e. oscilloscope) measurements are more relevant than frequency-domain ones (i.e. spectrum) simply because spectrum analyzers (with the exception of really expensive ones) would miss transients which dominate the type of electr... | |
| Backup Generator transfer switch The thing to watch for is switching transients (or switchover transients) whenever the UPS kicks in or the other way around. Here is a good blog on the subject: http://www.repeater-builder.com/backup-power/ups-test.html | |
| What do you think of this power cord? Among other things, the weak point of most power cables/connections is heat dissipation. We do FLIR (infrared imaging) test of cables in burn-in and here are some images: https://www.onfilter.com/cable-temperature We use pretty good industrial... | |
| ... abit confused: how does a power cord affect the presentation of sound... To add to discussion on power cables: no comments on audio quality - it is in the "ear of beholder," but just to point out how the cables heat up. We burn in 100% of our AC EMI filters and we take FLIR images in near-infrared spectrum - if you ar... |