kuksul08
Enlightened
Hey all,
I'm trying to analyze the waveform of my home-made buck converter. A multimeter is great for giving an average, but doesn't tell the whole story for switching regulators.
I have a Rigol 1054Z 4-channel scope and I've tried a few methods. I started by trying to simply measure the output ripple of my linear DC power supply, and it turns out there are several ways to do this, so I'm wondering what the best way is for the LED driver.
Just to give you an idea of where I'm at now - the last thing I tried was using two channels on either side of a 0.01ohm shunt in series with the LEDs and do a differential on the scope. I also tried one lead on the LED+ and the ground lead on the LED- to just measure voltage, since that should have a similar shape. Both of these were done with AC coupling since I want to see the high frequency part of the waveform. All I ended up seeing was a lot of 'noise'. I was expecting to see sort of a sawtooth pattern, like this:
Any ideas, hints, tips? Thanks in advance.
I'm trying to analyze the waveform of my home-made buck converter. A multimeter is great for giving an average, but doesn't tell the whole story for switching regulators.
I have a Rigol 1054Z 4-channel scope and I've tried a few methods. I started by trying to simply measure the output ripple of my linear DC power supply, and it turns out there are several ways to do this, so I'm wondering what the best way is for the LED driver.
Just to give you an idea of where I'm at now - the last thing I tried was using two channels on either side of a 0.01ohm shunt in series with the LEDs and do a differential on the scope. I also tried one lead on the LED+ and the ground lead on the LED- to just measure voltage, since that should have a similar shape. Both of these were done with AC coupling since I want to see the high frequency part of the waveform. All I ended up seeing was a lot of 'noise'. I was expecting to see sort of a sawtooth pattern, like this:
Any ideas, hints, tips? Thanks in advance.