Computer Audio Asylum

RE: Measuring accuracy - Jpp would be lower

65.19.76.104

In Reply to: RE: Measuring accuracy - Jpp would be lower posted by cics on April 03, 2008 at 01:24:30

Given that the two clocks are controlled as you described, there is no engineered reason for them to be synchronized. However, if there is any means of coupling energy associated with one clock into the other clock and if the free running rates of the two clocks are sufficiently close, then it is possible for the two oscillators to become synchronized. This happens in many systems of coupled non-linear oscillators. (A Google search turned up one such example.) In one case that I observed with computer networks, the separate clocks were "independent" crystal oscillators that were intended to be oscillating separately. Their synchronization was an artifact of the circuitry, not something intended by the digital design.

Since you are measuring to limits of precision that are close to the limits of your equipment, then I think it advisable to conduct some tests to ascertain that your "independent" clocks are actually independent. I would consider this to be part of the calibration procedure for your test setup.

Tony Lauck

"Perception, inference and authority are the valid sources of knowledge" - P.R. Sarkar

Ion Motion Synchronization in an Ion-Trap Resonator (Open in New Window)

Follow Ups:

RE: Measuring accuracy - Jpp would be lower - cics 10:53:03 04/03/08 (1)
- RE: Measuring accuracy - Jpp would be lower - Tony Lauck 14:33:06 04/03/08 (0)

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