Hi,
I just got step-up/step-down converter board (IC + some parts) I ordered from an asian supplier. I don't have much information about it, only some basic specs:
- fixed 3V3 output voltage
- input range: 1V8 - 5V
- max 500mA output current
My goal is to use it to convert the power of a li-on battery to the 3V3 required by one of my circuits. As I own a Rigol DS1052E and a programmable DC power supply, I wanted to test the "quality" (linearity of output, occurrences of peaks or dips) of the module. I want this mostly for fun and to train using my scope, not for a high-quality blog review
So this is how my approach I came of with looks like: I wanted to output some voltage curves between the specified input range to the module, and add a 60k resistor as load between GND and the output pin of the converter. I would then attach the two channels of the Rigol to GND and the input and output voltage. Any issues with this test setup?
My main problem is now how I should setup the Rigol measurement. I have played around with repetitive patterns from a function generator (sine/square waves etc.), but I have no idea how I should
- setup the trigger (there hopefully is no "edge" or "pulse" within the constant 3V3 output)
- do a long-time measurement (maybe around 30s, do I need a computer attached to the scope for this?)
I already configured the scope to use the "Long Mem" memory depth, but all captures are only fractions of a second when I stop them.
Do you have any idea how I can realize such a test with this scope?
Thanks in advance and best regards