BS EN 60444-9:2007

What is BS EN 60444-9 - Measurement of spurious resonances of piezoelectric crystal units about?

BS EN 60444-9 is the ninth part of an international standard that focuses on the measurement of quartz crystal unit parameters.

BS EN 60444-9 describes two methods for determining the spurious (unwanted) modes of piezoelectric crystal resonators.  It specifies the following methods:

• Method A i.e., full parameter determination, which allows the determination of the equivalent parameters of spurious resonances and is based on the methods, the same measurement equipment.
• Method B i.e., resistance determination is used for the determination of high impedance spurious resonance as specified, for certain filter crystals.

BS EN 60444-9 extends the capabilities and improves the reproducibility and accuracy compared to previous methods.

Who is BS EN 60444-9 - Measurement of spurious resonances of piezoelectric crystal units for?

BS EN 60444-9 on the measurement of spurious resonances of piezoelectric crystal units is useful for:

• Manufacturer of electronic device
• Manufacturer of watches
• Manufacturer or radioactive devices
• Electronic engineer

Why should you use BS EN 60444-9 - Measurement of spurious resonances of piezoelectric crystal units?

Piezoelectric crystal units show multiple resonances, which can be electrically represented by a parallel connection of a number of series resonant circuits.

BS EN 60444-9 describes two methodologies for the measurement of the spurious (unwanted) modes of piezoelectric crystal resonators. It defines the general requirements for the qualification, qualification maintenance,  procurement, and delivery of Quartz Crystal Units for space applications.

BS EN 60444-9 contains the appropriate inspection and test schedules and also specifies the data documentation requirements. BS EN 60444-9  is the specification for fixtures that allow the measurement of (series) resonance frequency, (series) resonance resistance, and equivalent electrical circuit parameters of leadless surface mounted quartz crystal units.

Measuring equipment described in BS EN 60444-9  will assist you in providing an error-correction feature through internal mathematical processing of measurement values and shall be capable of effectively eliminating the causes of errors via the connection of the S-parameter equipment with the test fixture.