Just captured this from David’s latest story on Instagram:
Turns out it’s a vectorscope and Wikipedia was kind enough to teach me what it is:
“A vectorscope is an oscilloscope used in both audio and video applications and it displays an X-Y plot of two signals, which can reveal details about the relationship between these two signals. Vectorscopes are highly similar in operation to oscilloscopes operated in X-Y mode; however those used in video applications have specialized graticules, and accept standard television or video signals as input (demodulating and demultiplexing the two components to be analyzed internally).”
Oh boy, things are going to be exciting on Thursday.