The combination of a laser having suitable wavelength/frequency and preliminary frequency response characteristics with an OSRC using appropriate frequency locking techniques can lead to further orders of magnitude reduction in the phasenoise and the linewidth while maintaining good frequency drift
However Allan variance cannot rule out frequency drift
Combined with the Eon[TM] film thickness controller, which is capable of real-time correction of any natural frequency drift
in the crystal during heating, any process that requires heated crystals or high measurement accuracy will see exponential improvement, leading to the highest accuracy possible as well as enabling continuous crystal operation without cooling.
10 shows the resonance frequency drift
due to temperature effect.
Along with the automatic battery switchover for backup power, a power-fail time stamp logs the time and duration of any power failure and, for accurate timekeeping over a broad temperature range, the devices feature a wide digital-trimming range that compensates for crystal frequency drift
demonstrated a resonator frequency drift
over one year of less than one part per million, which is the limit of the measurement accuracy.
To analyze this drift, the previous analysis is repeated by using an extra factor [phi], which denotes the phase shift due to frequency drift
Appropriate hermeticity and cleanliness remain a challenge, because sufficient contamination to introduce frequency drift
may result from the migration of trace contaminants within a package itself.
Raltron's latest family of Stratum 3 TCXOs meet holdover frequency accuracy specifications and 24-hour maximum frequency drift
requirements over temperature according to the Telecordia specification GR-1244-CORE (issue 2) and ITUT G-8 13.
They are also temperature stable, with a low return loss and low frequency drift
The sound quality is superior to what is produced by radio frequency devices, because there is no interference, no tuning adjustment and no frequency drift
Measurement of gene frequency drift
in small populations.