My QA402 just randomly glitches during measurements. This happens whether I’m running an automated test or just running measurements from the main screen. I’m able to reproduce the issue whether I’m using the loopback or measuring an actual device. The glitch only seems to happen for one or two measurements and then it goes back to measuring normally.
The following pics show my setup and one of the glitches that I encountered. I have a BNC cable connected directly from the L+ Output to the L+ Input. The L- Input has a 50 Ohm muting cap installed. All other BNC connectors are open. The unit is plugged directly into a Sabrent powered USB hub which is in turn connected to a Windows Surface Laptop 4 running Windows 10.
Hardware Setup: setup — ImgBB
I was running continuous measurements with a 192k sample rate, 256k FFT, Hann window, 8kHz signal @ -4 dBv.
The first screenshot shows a normal measurement running on the main screen. After several refreshes of the screen that all looked more or less identical the glitch shown in screenshot two occurred. The next screen refresh was back to normal for several more cycles as shown in screenshot three.
Evidently I can only include one screenshot as a new user.