IEC 60444-8:2016(E) 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 p-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. This edition includes the following significant technical changes with respect to the previous edition: a) modification of Clause 1; b) modification of 5.2; c) modification of 5.3; d) modification of 5.4; e) 6.3 Calibration of the reflection measurement system.
EN 60444-8:2017由欧洲电工标准化委员会 IX-CENELEC 发布于 2017-04-07,并于 2017-04-19 (7) 实施,于 2020-01-19 (7) 废止。
EN 60444-8:2017在国际标准分类中归属于: 31.140 频率控制和选择用压电器件与介质器件。
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表 1 菲律宾新增PNS标准一览序号PNS标准号PNS标准1PNS IEC 60122-2:2022 频率控制和选择用石英晶体元件-第2部分:频率控制和选择用石英晶体元件使用指南(IEC 1983年版)2PNS IEC 60368-2-1:2022压电滤波器-第2部分:压电滤波器使用指南第1节-石英晶体滤波器(IEC 1988年版)3PNS IEC 60368-2-2:2022压电滤波器-第2部分:...
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