I would like to compare the jitter measurement of my dac on TOSLINK vs USB input using my oscilloscope.
Played a 20 KHz sine wave and hooked up my scope probes to the output XLR pins and got the pure signal.
I then adjusted my vertical scale to the lowest possible value, set the display to infinite persistence and measured the signal's horizontal sway and got about 40 ns of jitter.
Not sure if this is the right approach but the measurment seems to be in the realm of expectation.

Any way I could improve this measurement?