Meaning
Electronic measurement instruments designed to measure the time elapsed between two distinct signal events provide high-resolution data for frequency and phase analysis. Resolving time differences down to the picosecond level allows engineers to calibrate oscillators and verify network synchronization accuracy. A time interval counter functions by starting a high-speed clock when it detects a trigger on the first input and stopping it when it detects a trigger on the second.
Measurement Precision
Operation of a time interval counter involves detecting the exact moment a voltage threshold is crossed on two separate channels. High-speed sampling provides a direct measurement of the phase offset between a primary clock and a slave device. This precision is a requirement for testing hardware destined for 5G telecommunications or high-speed data centers.
Resolution Threshold
Inherent noise within the internal circuitry and the stability of the reference clock determine the smallest measurable difference. Modern versions of the time interval counter use interpolation techniques to achieve a resolution that exceeds the frequency of their internal crystal. Choosing an instrument with sufficient resolution is a requirement when measuring the jitter and wander of atomic frequency standards.
Event Comparison
Comparing a 1PPS signal from a GPS receiver against a local oscillator reveals long-term drift and short-term stability. This analysis is the final step in certifying that a new piece of hardware is ready for production.
