Citation
Abstract
This article shows how a commercial time interval counter can be used to measure the relative stability of two signals that are offset in frequency and mixed down to a beat note of about I Hz. To avoid the dead-time problem, the counter is set up to read the time interval between each beat note upcrossing and the next pulse of a 10 Hz reference pulse train, The actual upcrossing times are recovered by a simple algorithm whose outputs can be used for computing residuals and Allan variance, A noise-floor test yielded a Af/f Allan deviation of 1.3 X 10~9 /r relative to the beat frequency.
Details
- Volume
- 42-90
- Published
- August 15, 1987
- Pages
- 149–156
- File Size
- 412.4 KB