I am measuring the DC-DC converter active power (P in watts) efficiency of a TI (Webench) LM3150 PCB that converts 12 to 5VDC.
In the answer of question Measuring precisely the efficiency of a power converter it is suggested to use:
- an averaging function on the (multi)meter
- low pass filtering to get rid of any high frequency measurement noise
Our Zes Zimmer LMG95 precision power meter has got several low-pass filtering options available:
- AAF: analog anti-aliasing-filter
- AAF + 30Hz
- AAF + 60Hz
- AAF + 87.5Hz
- AAF + 175Hz
- AAF + 1.4kHz
- AAF + 2kHz
- AAF + 2.8kHz
- AAF + 6kHz
- AAF + 9.2kHz
- AAF + 18kHz
The frequencies here are digital low-pass filters with a cut off frequency of about ... Hz.
Which low pass filter - I can choose only one - to best configure in this active power efficiency measurement setup? And why choose that one?