| Products > Test Equipment |
| E36300 Series Programmable DC Power Supplies (E36311A, E36312A, E36313A) |
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| rsjsouza:
One detail I forgot to mention is that the peak voltage varied a lot (the maximum I got was 21Vpp) but the waveform was quite consistent. The oscilloscope is in full BW mode (500MHz, as Sinisa mentioned). This is the 6V output, BTW. I don't have a measurement of the signal before the repair. Other aspects that were mentioned by others: the PS still draws 10W (!) in standby and the backlight still seems to be turned on all the time (there is a faint glow on the screen). |O |
| nctnico:
You can try to measure the other outputs. I think you'll see the same signal. |
| 2N3055:
I think nctnico might be right. It seems to be some kind of inductive spike from sudden switch on of transformer. I could replicate a version of it on 3 different linear PSU. Maybe some version of controlled phase switch on would be useful. Or it is practical short circuit on secondary (elkos after diode bridge) that makes core go into saturation and makes some nonlinear kind of spike... |
| bitseeker:
--- Quote from: rsjsouza on August 18, 2018, 09:08:27 am ---Other aspects that were mentioned by others: the PS still draws 10W (!) in standby and the backlight still seems to be turned on all the time (there is a faint glow on the screen). |O --- End quote --- Is the cooling fan still running like it was before? I'm still puzzled by that vampire power draw. It's not like the thing has an OCXO in it. Does it boot faster from standby and, hence, needs 10W to keep it ready to turn on? |
| sdouble:
I really suffered from the power on spike from all 36312A that I bought for the lab. I used them to power charge sensitive preamps. They killed a large number of the preamps, actually their input linear regulator (LT3042). I would like to know how much of the initial issue remains : could I safely power my preamps with the modified 36312A. |
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