BS EN 60444-8:2017 describes test fixtures suitable for leadless surface mounted quartz crystal units in enclosures as defined in IEC 61837 (all parts). These fixtures allow the measurement of (series) resonance frequency, (series) resonance resistance, and equivalent electrical circuit parameters L1, C1 and C0 using the measurement techniques specified in IEC 60444-5 and for the determination of load resonance frequency and load resonance resistance according to IEC TR 60444-4 and IEC 60444-11.

Two test fixtures are described in this document:

• 1) A fixture using the Π-network circuit with electrical values as described in IEC 60444-1 for measurements in transmission mode up to 500 MHz. This fixture includes optional means to add physical load capacitors for the measurement of load resonance parameters up to 30 MHz in accordance with IEC 60444-4. The range of load capacitance is 10 pF or more. Calibration of the measurement system and CL adapter board is explained hereinafter.
• 2) A fixture based on the reflection method, suitable for a frequency range up to 1 200 MHz. No provisions for adding a physical load capacitance are anticipated. Load resonance parameters can be measured by using the method of IEC 60444-11.

Cross References:
IEC 61837-2:2011
IEC 60444-5:1995
EN 61837-2 (IEC 61837-2:2011) AS EN 60444-1:1997
EN 60444-2
IEC 61837
EN 61837
IEC 61837-1:2012
EN 61837-3 (IEC 61837-3:2015) AS
IEC 61837-3:2015
IEC 60444-9:2007
EN 60444-7 (IEC 60444-7:2004) AS
IEC 60444-7:2004
IEC 60122-1:2002
EN 60122-1 (IEC 60122-1:2002) AS
IEC 60444-6:2013
EN 60444-9 (IEC 60444-9:2007) AS
IEC 60444-2:1980
EN 61837-1 (IEC 61837-1:2012) AS
EN 60444-6 (IEC 60444-6:2013) AS
IEC 60444-1:1986


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