Hi @PFM, yes, this is commonly called “open loop testing.” In short, you need to prepare (with the QA40x software) a special exponential chirp WAV. And then move that to the device you want to test. And once you are ready to play it, you will right click on the Run/Stop button to bring up the “triggered acquisition” dialog below. Here you set your trigger level and then start. And then you play the WAV on the DUT.