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quartz crystal frequency standard
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quartz crystal frequency standard
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工学
频率标准
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quartz crystal frequency standard
石英晶体频标
利用石英晶体的压电特性、高Q特性及稳定的物理化学性能,与振荡电路一起组成高稳定的石英晶体振荡器,从而输出较高准确度和稳定度的特定频率信号的频率标准。又称石英晶振频标(简称晶振频标)、石英晶体振荡器(简称晶振)。通常指日老化率在10-10量级或优于此量级,在计量或其他系统作为标准使用的晶振。
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spatial demand curve
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spatial dependent rule
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spatial description
spatial dimension
spatial dimensionality
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spatial disorientation
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spatial domain
spatial econometrics
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spatial economics
spatial ellipsoidal harmonic
spatial elliptic coordinate
spatial encoded frequency domain optical coherence tomography
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