A high vacuum thin film deposition machine evaporates a metal onto the surface of each
blank to form an electrode pattern.
The frequency of each quartz crystal is measured while a metal is evaporated onto one
side of an exposed electrode until the target frequency is reached to within ±5.
The inside of a holder is evacuated and filled with the inert Nitrogen gas (N2) to protect
crystal elements mechanically and prevent electrodes or other parts from being oxidised
or influenced by ambient temperatures.
The leakage is tested 100% in FLUORINERT LIQUID.
Aging is the frequency change with time when factors external to the oscillator such as
environment and power supply are kept constant.
Final test & packing
The crystals are tested for their motional parameters and sorted into frequency groups.
The trimming range of the oscillators is tested, as is the short term stability and
requency shift due to shock.
The oscillators must pass a final inspection and is then checked and released by our