Electronics > Beginners
Power Supply, isolation?
coolyota:
Hello first post on EEVBlog, I have recently taken up an interest in electronics and have bought myself a Mean Well PSU (https://www.meanwellaustralia.com.au/products/lrs-100). It didn't occur to me that I needed an isolation transformer PSU.. now that I am looking to buy my first oscilloscope. It's likely going to be a Rigol DS1504Z scope. I have watched Dave's YT video on danger of ground loop. Just a little concern that the MeanWell PSU is not isolated. I am not competent enough to read the spec sheet to determine if the MeanWell PSU is isolated. :-//
Am I correct to say the output on -Ve is connected to Earth? So, say if I connect the GND clip on the scope probe to a +ve rail on a circuit I'll have a ground loop?
Thanks in advance.
ataradov:
There is a capacitor there. This is an isolated design. You only need to worry about the DC isolation.
Your isolation is achieved though a transformer in direct path and optocouplers in the feedback path.
coolyota:
--- Quote from: ataradov on November 03, 2018, 05:21:36 am ---There is a capacitor there. This is an isolated design. You only need to worry about the DC isolation.
Your isolation is achieved though a transformer in direct path and optocouplers in the feedback path.
--- End quote ---
Does it mean that it is safe for DUT to be connected to the PSU and probe with scope?
ataradov:
Yes, absolutely. This is a typical design for the isolated PSU, they all are built like that.
coolyota:
Fantastic. Thank you so much :)
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