Measures video delay, audio delay, relative delay between audio channels, or relative delay between video and audio, based on test time code signals.

Generates and transmits TTC signals in video, audio, or VANC output that match the phase of source video, audio, or VANC signals. Transmitted video and audio signals reenter the checker and are compared to the current time to determine video and audio delay. Measurement of delay over long distances is possible via GNSS using two checkers.