Timing Signal
Physical electrical signal generated by a precision clock to mark the start of each integer second with extreme accuracy. Precise hardware pulse per second outputs enable sub-microsecond synchronization across multi-sensor arrays. This signal is typically a logic-level pulse with a very fast rising edge.
It serves as a universal heartbeat for distributed measurement systems.
Synchronization Reference
Global positioning system receivers often provide this output to allow local clocks to align with universal coordinated time. A hardware pulse per second signal bypasses the latency and jitter associated with software-based timing protocols. By triggering an interrupt on the local processor, the pulse provides a definitive timestamp for data acquisition.
This method is the standard for high-precision geophysical and astronomical observations.
Signal Integrity
Transmission of the pulse over long cables requires careful termination to prevent reflections and signal degradation. A clean hardware pulse per second signal must have low jitter and a stable voltage level to be recognized by the receiving equipment. Shielded twisted pair cables or coaxial lines are used to protect the signal from electromagnetic interference.
Verification occurs by measuring the pulse-to-pulse stability with a high-speed oscilloscope.
Clock Distribution
Large scale systems use distribution amplifiers to send the timing reference to multiple devices simultaneously. Each device receiving the hardware pulse per second uses it to reset its internal sub-second counter. This architecture ensures that every sensor in the network starts a measurement at the exact same moment.
Reliability of the synchronization is confirmed by comparing the phase of the pulses at each node.
