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| R&S NGE100 voltage jumping around |
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| RBBVNL9:
Not sure I understand your question. Earlier, you asked: --- Quote ---The electronic fuse should switch off the voltage as fast as possible and even for a short increase of current above the set limit in oder to protect the DUT. Therefore its current limit should be adjustable after the switch on current has happend. --- End quote --- I think I have shown above how that is done on the NGE. But now your question is: --- Quote ---How can one switch off the fuse function and change the behavoir to current limit only? That means the current stays and the voltage goes down to keep the current the same with a sinking value of the load resistor. --- End quote --- What you describe is the default working mode of the NGE. This is the way this PSU it behaves until you active the Fuse function (fuse trip mode) for a given channel. If your question was meant to be whether you can switch between fuse trip mode and current limit mode while the channel output is activated then my answer would be that, to the best of my knowledge, this is not possible. But I don't see exactly why you would like to do that, and it would not offer the protection of your DUT that you were looking for. |
| kladit:
@RBBVNL9 The reason is i did this .. I switched the power supply on, pressed CH and and adjusted a current. Then I switched on OUTPUT and increased the load current. At the point the load current increased over the adjusted current the voltage decreased ang the numbers got red. Ok , behavior expected. Then I switched OUTPUT off and pressed FUSE and CURRENT and adjusted for lower fuse current. Then I tuned my load to blow the fuse. The word fuse got red and the voltage got switched off. Ok , behavior expected. Then I set my load back, switched CH1 on again, FUSE lights got green again, pressed CURRENT and was able to decrease the current setting to a value lower than my load current and then the fuse 'blowed' again. So you are right and I was wrong. The fuse current is adjustable later on to a lower value than the value adjusted for current limit. In other words: as long as the word FUSE shines up the current button adjusts the fuse current and not the current limit current. But up to now I found no other way to get rid of the FUSE than to switch the NGE100 off and on again. Therefore the question in my last post. It is a little inconvenient to re-adjust the fuse current limit to a higher value every time the fuse got blown and you switch the output on again and then, after the load current of the capacitors has settled, re-adjust it to a lower value again. So my wish to R&S now goes for a adjustable fuse delay time after channel (re-)activation. Thanks for forcing me re-thinking the whole problem. |
| RBBVNL9:
Happy to hear this addressed your issue. As to whether you really need to turn of the PSU off altogether in the case you mention, let me check that tomorrow. |
| lucasc:
Hi @justanothername, What did you end up doing? Did you send it back, or was it something that could be fixed? I'm having the exact same problem and I agree with you that this is not acceptable for a PSU of the level and cost. If this is the expected performance, I'm definitely sending it back. I also noticed that if I move the voltage up and down with the output turned off, the output voltage shows a negative step of about 450mV for about half a second, which is crazy. I've attached the image of the negative step I just mentioned about. Looking forward to your feedback. |
| RBBVNL9:
Hello Lucasc, --- Quote ---I also noticed that if I move the voltage up and down with the output turned off, the output voltage shows a negative step of about 450mV for about half a second, which is crazy. --- End quote --- Never noticed that before, but you are right, I can indeed replicate that. With the output being turned off, it's there every time when you move the voltage setting from 4.10 V down to 4.0 V. Very very weird. This should definitely be corrected! |
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