Measuring Master Clock and fs

Here is another way to measure frequency > 100 KHz. The 40-buck scope has a frequency feature that is good up to 5 MHz (It is probably good up to 8 MHz as some users have experienced)

The picture shows the MCK line with 44.1KHz material playing. If we divide this by the sample rate, 5,647,218 Hz / 44,100 Hz = 128.055. Thus the system is running at 128x fs



What would be the frequency for 48KHz? We know the fs=128x, so the frequency is 48,000x128=6.144 MHz



Pretty good measurement...