Timeline for Earth decoupled power supply
Current License: CC BY-SA 3.0
13 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Apr 27 at 7:35 | answer | added | user345076 | timeline score: 0 | |
| Aug 19, 2016 at 0:25 | vote | accept | dronus | ||
| Aug 19, 2016 at 0:25 | comment | added | dronus | The setup is given: Two gripped electrodes, no further constraints. I have to go with that. | |
| Aug 18, 2016 at 0:33 | comment | added | D.A.S. | Your CM impedance is about 300pf to line voltage or ground. If they sit on grounded metal chair then this increases the CM capacitance to ground, thus shunting stray fields. Otherwise remove shoes and stand on grounded plate. Make sure you have medically approved power supply. (low leakage line filter) | |
| Aug 18, 2016 at 0:28 | answer | added | D.A.S. | timeline score: 0 | |
| Aug 17, 2016 at 22:58 | answer | added | Kaz | timeline score: 0 | |
| Aug 17, 2016 at 22:44 | answer | added | Harvard | timeline score: 0 | |
| Aug 17, 2016 at 21:53 | comment | added | Harvard | If there is 50 AC Volts between the protective earth and the body standing on the ground then the bonding of the protective earth to an earth grounding rod DOES NOT EXIST. This is called a floating ground and because of capacitive coupling between HOT/GND and GND/NEUTRAL it will float some where less then 120VAC/2. | |
| Aug 17, 2016 at 21:32 | comment | added | dronus | It uses just two electrodes, and it is for public demonstration (eg. fairs), so there is no good possibility to add a third electrode to the leg or whatever. People just get the grip on two handles and that should be enough. | |
| Aug 17, 2016 at 21:19 | comment | added | Nick Alexeev | If you only need to make a quick demonstration, then run the laptop from the battery. But I have a gut feeling that you may have errors in your EKG setup. Do you have a 2-electrode or a 3-electrode setup? When powered from a computer, do you pick up the power from USB jack? If you could post a schematic snippet of your front end, that would help. | |
| Aug 17, 2016 at 21:14 | comment | added | dronus | The test subject can easily pull down this 110V to some moderate level. It is not feelable in any way. The capacitance isn't just that large. I also checked some other devices device just for understanding.. for example laptops: Body to Thinkpad about 5V, body to Mac Book: 120V. Maybe it's time to start some fanboy war on electrically charged computers :-) | |
| Aug 17, 2016 at 21:09 | comment | added | Nick Alexeev | Furthermore, the test subject can't reject 110V either. [Sorry, I couldn't resist.] | |
| Aug 17, 2016 at 21:07 | history | asked | dronus | CC BY-SA 3.0 |