Glossary - alphabet order - "H"
Hermetic seal
A hermetic seal is part of a metal can package that allows a lead (pin) to protrude from the package while maintaining the vacuum condition and insulation of the output signal.
Structure diagram of crystal unit
High frequency
The high frequency band is in the megahertz (MHz) section of the frequency spectrum.
Reference: Frequency band
High-stability crystal oscillator
This name is used to distinguish this type of crystal oscillator from ordinary clock oscillators. Among Seiko Epson products, this indicates that the oscillator's frequency stability has a precision range better than ± 30 × 10-6. High-precision oscillators generally include a crystal oscillator that has superior temperature and ageing characteristics as well as a crystal oscillation circuit that has superior power supply voltage variation and load variation characteristics.
Hz
This is the symbol for Hertz, a unit of measure for frequency. 103 Hz = 1 kHz (kilohertz), 106 Hz = 1 MHz (megahertz), and 109 Hz = 1 GHz (gigahertz).
