Which term specifically names the device that provides the timing signal to coordinate all instrument actions?

Which term specifically names the device that provides the timing signal to coordinate all instrument actions?

• A. Display unit or CRT
• B. Marker circuit
• C. Pulser
• D. Synchronizer, clock, or timer

Answer: (D)

The key idea is that there is a master timing reference in the instrument that coordinates when every part acts. The device that provides this timing signal is the synchronizer, clock, or timer. It generates precise trigger pulses that synchronize when the pulser fires, when the receiver gates open to listen for echoes, and when data are sampled and displayed. The pulser itself creates the ultrasonic pulse, but it does so in response to the timing signal from the synchronizer. The display unit shows the results, and marker circuits place indicators based on timing, yet they don’t establish the timing reference themselves.

The key idea is that there is a master timing reference in the instrument that coordinates when every part acts. The device that provides this timing signal is the synchronizer, clock, or timer. It generates precise trigger pulses that synchronize when the pulser fires, when the receiver gates open to listen for echoes, and when data are sampled and displayed. The pulser itself creates the ultrasonic pulse, but it does so in response to the timing signal from the synchronizer. The display unit shows the results, and marker circuits place indicators based on timing, yet they don’t establish the timing reference themselves.