| Products > Test Equipment |
| E36300 Series Programmable DC Power Supplies (E36311A, E36312A, E36313A) |
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| Ahrenp:
Anyone with one of these units notice an audible hum when the unit is "off"? Mine (E36312A) has a low hum when I'm sitting in a quiet room with everything off; it's not noticeable at all when other gear is on though. It seems to alternate periodically from a steady hum to alternating on/off every couple seconds or so. |
| Fred27:
It's definitely still "on" even powered down. That's a soft power switch. I think it draws about 10W on standby too. |
| HighVoltage:
I have the E36312A and there is no hum at all. But there are a few firmware issues I have come across that are very annoying. Sometimes the PSU just stops responding and I need to unplug the instrument for a power cycle, since the soft power switch is then also not responding. What I find also annoying: The voltage turning knob can increase the output by 1mV per indent. But the real output is not increasing by the same amount for each indent. In other words, there is a big difference between the set point the actual readout and what is measured externally with a different meter. Hmm, seems like a firmware bug as well. This could be much more precise. |
| adamgreig:
I think the hum might be the fan occasionally spinning up? This video (which nihtila posted on the contest thread) highlights a bunch of bugs and options for improvement, perhaps including your issue HighVoltage: |
| nctnico:
Why would you want to use the knob to adjust the voltage? On PSUs with a keypad I just punch the number in. Much quicker and easier. |
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