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| Oscilloscope interference. |
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| radiolistener:
--- Quote from: GadgetBoy on July 06, 2019, 12:54:03 am ---I was able to track the interference down to my LED driver for my workbench lights. It is pumping a lot of HF into the air and into the mains --- End quote --- then this is a cheap Chinese LED, they don't install filters in order to reduce costs. Just put it into garbage and buy some good quality LED lamp. It should not emit EMI. |
| GadgetBoy:
--- Quote from: radiolistener on July 06, 2019, 11:12:35 am --- --- Quote from: GadgetBoy on July 06, 2019, 12:54:03 am ---I was able to track the interference down to my LED driver for my workbench lights. It is pumping a lot of HF into the air and into the mains --- End quote --- then this is a cheap Chinese LED, they don't install filters in order to reduce costs. Just put it into garbage and buy some good quality LED lamp. It should not emit EMI. --- End quote --- I was hoping for a low-budget option, not having a lot of money for these things. Would decoupling capacitors or a low-pass filter help? Sent from my ONEPLUS A3000 using Tapatalk |
| radiolistener:
--- Quote from: GadgetBoy on July 06, 2019, 03:34:42 pm ---I was hoping for a low-budget option, not having a lot of money for these things. Would decoupling capacitors or a low-pass filter help? --- End quote --- no, capacitors cannot help. This bullshit is designed to be cheap at expense of increased level of RF interferences. You can try to add ferrite beads inside LED lamp, but it will be too complicated and may not help, because these cheap things also using cheap circuits at expenses of increased level of RF interferences. Also you can try to completely remove LED lamp driver and replace it with ballast capacitor. This cheap bullshit has low cost due to high level of RF interferences. The more cheap way is to put it into garbage and buy good quality LED lamp, because you will spend much more in order to fight with it's noise. If you're need LED lamp for your lab with measurement equipment, you should not use this cheap crap, because it has too high RF noise and will affects your measurements. |
| bob91343:
Years ago I refused to use fluorescent lamps due to the high noise they generated. Recent lamps don't have this problem; I use a fluorescent lamp on my workbench with no trouble. The same evolution is happening with LEDs. Eventually the noise will be corrected but you are a victim of the early days. The comments about replacing the offending lamps are spot on. And the cost will be forgotten in the long run. I forget who said it: Quality is remembered long after cost is forgotten. |
| GadgetBoy:
--- Quote from: radiolistener on July 06, 2019, 04:40:32 pm --- --- Quote from: GadgetBoy on July 06, 2019, 03:34:42 pm ---I was hoping for a low-budget option, not having a lot of money for these things. Would decoupling capacitors or a low-pass filter help? --- End quote --- no, capacitors cannot help. This bullshit is designed to be cheap at expense of increased level of RF interferences. You can try to add ferrite beads inside LED lamp, but it will be too complicated and may not help, because these cheap things also using cheap circuits at expenses of increased level of RF interferences. Also you can try to completely remove LED lamp driver and replace it with ballast capacitor. This cheap bullshit has low cost due to high level of RF interferences. The more cheap way is to put it into garbage and buy good quality LED lamp, because you will spend much more in order to fight with it's noise. If you're need LED lamp for your lab with measurement equipment, you should not use this cheap crap, because it has too high RF noise and will affects your measurements. --- End quote --- Something like this? https://www.meanwell.com/productPdf.aspx?i=229#1 Seems pretty decent at 25$. Sent from my ONEPLUS A3000 using Tapatalk |
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