In a basic pulse-echo instrument, which parameter is determined by the synchronizer, clock, or timer circuit?

In a basic pulse-echo instrument, which parameter is determined by the synchronizer, clock, or timer circuit?

• A. Pulse length
• B. Pulse repetition rate
• C. Sweep length
• D. Gain

Answer: (B)

Timing control in a pulse-echo instrument governs when the next pulse is emitted, so it sets how often pulses are sent—the pulse repetition rate. The synchronizer, clock, and timer work together to space each burst in time and to enforce the wait for echoes to return before the next pulse. The length of each pulse is determined by the pulser itself (pulse width), not the timing circuit. Sweep length is about how long the receiver is allowed to listen or how the display time window is set, and gain is about amplification of the received signal. So, the parameter controlled by the timing circuitry is the pulse repetition rate.

Timing control in a pulse-echo instrument governs when the next pulse is emitted, so it sets how often pulses are sent—the pulse repetition rate. The synchronizer, clock, and timer work together to space each burst in time and to enforce the wait for echoes to return before the next pulse. The length of each pulse is determined by the pulser itself (pulse width), not the timing circuit. Sweep length is about how long the receiver is allowed to listen or how the display time window is set, and gain is about amplification of the received signal. So, the parameter controlled by the timing circuitry is the pulse repetition rate.