| General > General Technical Chat |
| Is this kind of voltage supposed to be there? |
| (1/2) > >> |
| objekt406:
Hi, a few days ago i got shocked by touching the pins on the mains cable going to my lab psu, while moving it. Now im curious if this is a major fail or if its normal to have this high a voltage on the input to the psu. I tested with a PC psu and it didnt even measure above 2V. |
| objekt406:
I have to note, that the main power switch was off while measuring |
| capt bullshot:
Your description is unclear. My crystal ball says: This could be the residual charge of the EMC (X class) capacitor across the PSU input. Yes, it's normal for older units, modern stuff must discharge this capacitor within a few seconds (by applicable safety regulations), most probably because people had experiences like you. |
| objekt406:
How can i describe it better for you, so its clearer? :) |
| TimFox:
For example, I read your post and his answer to indicate the following description: 1. You shut off the PSU at its power switch. 2. You unplugged the PSU's power cable from the outlet. 3. You touched a contact on the power plug and felt a shock. 4. You did the same with another PSU and measured a very small voltage at the plug. Before I retired, I found that people (both co-workers and customers) were afraid to over-specify a situation when reporting a problem. |
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