Phase difference measurement of a 100 kHz tone

1. How can phase difference be measured?
2. How are frequency and phase measured?

How can phase difference be measured?

Phase difference can be measured on an oscilloscope by determining the time delay between two waveforms along with their period.

How are frequency and phase measured?

Frequency is commonly measured in Hertz, or cycles per second. Time is measured in seconds. So frequency x time = (cycles/sec) x sec = # of cycles. Thus two sine waves differing in frequency by 200 Hz get progressively out of phase with each other by 200 cycles every second.