Hello all, I'm a newbie here and hope is the right section for the thread after several searches but can't find the answer.
I have a project to build a simple electric load for testing PC power supply and will be following intel ATX standard for measuring the ripple but I have a bit concern about point to be should measuring because of intel didn't suggest where is better for a measure just gave the diagram
So I start this thread to need a suggestion where the point is should be correct or better and about the simple circuit to build a junction for connecting the oscilloscope following intel diagram.
From the picture below, intel suggest connecting two capacitors between power and ground line which 10uF/0.1uF and probe from DSO will be connected before 10uF and one after 0.1uF but didn't have any information when we should be connected capacitor to wire cable,
should be close to PSU or close to Load but from I have several searching for, all suggestions close to PSU would be better.
1. Well if put probe close to PSU as possible so where I should be connected capacitor?
2. If I have built a small PCB and using the BNC connector (fig2) for measuring point and put it near load is okay?
3. following fig2 my diagram for connected capacitors is correct?
4. Do I need for 50 Ohms terminator before connecting a probe to DSO because I just using dual prob, not a differential probe?
About DSO, I have watched Dave video how to measure ripple and have some doubts about the method for probe connecting, I saw Dave has put 50 Ohms pass-through adapter before connecting the probe to DSO and I have understood for the reason but...
if following intel standard or ATX, they didn't suggest to using 50 Ohm adapter for cable but HP standard or methodology suggestion in a different way.
HP includes Keysight suggest for put 50 Ohm resistor and 0.01uF capacitor in series before connecting the probe to PSU wire and put 50 Ohms terminator at end of probe cable before connecting to DSO.
1. Which HP method or diagram has shown it means they use the differential probe right?
2. if I have to focus on PC PSU testing should be following intel suggestion?
From all question above, I need to know the way or how to make sure it not wrong and minimum minor error as much as possible if anyone has some more advice which better way or simpler would be great
Thank you for all answer