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| Low-radiated noise bench linear power supply |
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| Someone:
--- Quote from: Sariel on October 08, 2024, 05:51:54 am ---I haven’t set any specific limits for voltage and current ranges yet, as I’m open to considering the most commonly recommended options. Using a battery for power is a good idea and typically useful for final testing, but for most of the initial bring-up, I prefer using an adjustable power supply. --- End quote --- Perhaps a linear "lab" type power supply modified to run from batteries? |
| Someone:
--- Quote from: Sariel on October 08, 2024, 05:51:54 am ---The classic Agilent/Keysight E3630A is a solid choice! What are your thoughts on the GW Instek GPE series or the TTI PL series for this purpose? --- End quote --- Given how much the TTI units audibly buzz, their emissions might be short of your needs. But the only real test is to measure in your frequency range. |
| wilhe_jo:
--- Quote from: Sariel on October 07, 2024, 05:20:25 am ---The main issue I encounter is the radiated noise from the power supply itself, which tends to interfere with my sensitive circuits. I can easily detect switching frequencies from test equipment, and I’m looking for a power supply that is well-shielded and has negligible radiated emissions. --- End quote --- Well, get yourself a shielding room. That has about 80-100dB attenuation to the outside world. A new emi shielding room (no absorbers; just a steel "room" with nice door) sets you back in the realm of 30k. Used max 10k Every radio "service" (radio, TV, rfid door openers,...) has pretty high levels compared to PSUs. Other than that LED lighting can be a problem, flourescent lamps will always be a problem. Linear PSUs tend to have big transformers having relatively large stray fields. In the end it's a distance game. --- Quote from: tautech on October 07, 2024, 05:58:43 am ---4ch SPD4000X specifies: EMC Class A test and measurement products in compliance with European EMC Directive 2014/30/EU --- End quote --- This one would be particularly bad! Class A means way higher emissions and should not operated where you have non-industrial stuff running. So I suggest getting a battery... That's the cheap option.. Getting a shielded room is the other extreme. Btw: I found that usb-c power banks have low emissions... At least the ones I have... I power my active loop antenna for emc measurements with them. 73 |
| tautech:
--- Quote from: wilhe_jo on October 08, 2024, 07:19:11 am --- --- Quote from: tautech on October 07, 2024, 05:58:43 am ---4ch SPD4000X specifies: EMC Class A test and measurement products in compliance with European EMC Directive 2014/30/EU --- End quote --- This one would be particularly bad! Class A means way higher emissions and should not operated where you have non-industrial stuff running. --- End quote --- Thanks, can you link us to the standard ? |
| wilhe_jo:
Well, almost any standard uses "Class A" for stuff that's classified "industrial". Usually you have about 10dB higher limits there. I'm pretty sure, they don't respect the standard/directive entirely. Usually, the standards give you some text to warn people from Class A products. If not, the directive 2014/30/EU does... But I can't find any "trigger-words" in the manual other than "Class A". Anyhow, they don't tell you the standard they applied. Directive 2014/30/EU just tells you to go with the state-of-the-art. Google couldn't find a Declaration of Conformity either... But I found something for the SPS5000x. There they also have "Class A" in the datasheet, and google found some DoC. They use CISPR11/EN55011, so it's clearly not intended to be used in the residential environment. 73 |
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