一般的晶振作用是产生振荡，晶振有不同的频率，可以使电路工作在稳定的频率范围之内，它是给集成电路的启振器件，晶振就是步调基准、稳定频率、选择频率。几乎所有工业，科技，车载，数码，电子等多个领域都可以用得上晶振。
晶振的用处非常广泛，如防疫电子哨兵系统用到的晶振，可以通过扫描健康码、核验人脸或读取二代证，能快速核验通行人员的实时体温、健康码状态、核酸检测结果和疫苗接种等信息并记录。电子哨兵集人脸识别测温、健康码核验、核酸与疫苗接种等信息功能于一体，是智能终端系列化电子产品。
日本爱普生晶振TSX-3225是一款小体积尺寸3.2x2.5mm石英晶体谐振器，四脚贴片晶振，无源晶振，频率范围16MHz至48MHz，工作温度范围-40℃至+85℃（+105℃）。具有超小型，轻薄型，耐热及耐环境特性，被广泛用于移动电子设备，智能手机，ipad，移动pos机，笔记本电脑，照相机，摄像机，耳机，音响，数码电子产品等领域。
防疫电子哨兵系统用晶振X1E000021004716
            贴片晶振
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   尺寸
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   型号
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   频率
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   负载
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   精度
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         频率公差
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| X1E000021001916 | 3.2x2.5x0.6mm | TSX-3225 | 16.000000MHz | 9pF | +/-10ppm | +/-9ppm | -20to+75°C |
| X1E000021004716 | 3.2x2.5x0.6mm | TSX-3225 | 20.000000MHz | 9pF | +/-10ppm | +/-20ppm | -40to+105°C |
| X1E000021004816 | 3.2x2.5x0.6mm | TSX-3225 | 24.000000MHz | 9pF | +/-10ppm | +/-20ppm | -40to+105°C |
| X1E000021011116 | 3.2x2.5x0.6mm | TSX-3225 | 16.000000MHz | 8pF | +/-10ppm | +/-10ppm | -20to+75°C |
| X1E000021011216 | 3.2x2.5x0.6mm | TSX-3225 | 16.000000MHz | 9pF | +/-10ppm | +/-10ppm | -20to+75°C |
| X1E000021011316 | 3.2x2.5x0.6mm | TSX-3225 | 16.000000MHz | 10pF | +/-10ppm | +/-10ppm | -20to+75°C |
| X1E000021011416 | 3.2x2.5x0.6mm | TSX-3225 | 16.000000MHz | 12pF | +/-10ppm | +/-10ppm | -20to+75°C |
| X1E000021011516 | 3.2x2.5x0.6mm | TSX-3225 | 16.000000MHz | 16pF | +/-10ppm | +/-10ppm | -20to+75°C |
| X1E000021011616 | 3.2x2.5x0.6mm | TSX-3225 | 16.000000MHz | 8pF | +/-10ppm | +/-20ppm | -40to+85°C |
| X1E000021011716 | 3.2x2.5x0.6mm | TSX-3225 | 16.000000MHz | 9pF | +/-10ppm | +/-20ppm | -40to+85°C |
| X1E000021011816 | 3.2x2.5x0.6mm | TSX-3225 | 16.000000MHz | 10pF | +/-10ppm | +/-20ppm | -40to+85°C |
| X1E000021011916 | 3.2x2.5x0.6mm | TSX-3225 | 16.000000MHz | 12pF | +/-10ppm | +/-20ppm | -40to+85°C |
| X1E000021012016 | 3.2x2.5x0.6mm | TSX-3225 | 16.000000MHz | 16pF | +/-10ppm | +/-20ppm | -40to+85°C |
| X1E000021012116 | 3.2x2.5x0.6mm | TSX-3225 | 24.000000MHz | 8pF | +/-10ppm | +/-10ppm | -20to+75°C |
| X1E000021012216 | 3.2x2.5x0.6mm | TSX-3225 | 24.000000MHz | 9pF | +/-10ppm | +/-10ppm | -20to+75°C |
| X1E000021012316 | 3.2x2.5x0.6mm | TSX-3225 | 24.000000MHz | 10pF | +/-10ppm | +/-10ppm | -20to+75°C |
| X1E000021012416 | 3.2x2.5x0.6mm | TSX-3225 | 24.000000MHz | 12pF | +/-10ppm | +/-10ppm | -20to+75°C |
| X1E000021012516 | 3.2x2.5x0.6mm | TSX-3225 | 24.000000MHz | 16pF | +/-10ppm | +/-10ppm | -20to+75°C |
| X1E000021012616 | 3.2x2.5x0.6mm | TSX-3225 | 24.000000MHz | 8pF | +/-10ppm | +/-20ppm | -40to+85°C |
| X1E000021012716 | 3.2x2.5x0.6mm | TSX-3225 | 24.000000MHz | 9pF | +/-10ppm | +/-20ppm | -40to+85°C |
| X1E000021012816 | 3.2x2.5x0.6mm | TSX-3225 | 24.000000MHz | 10pF | +/-10ppm | +/-20ppm | -40to+85°C |
| X1E000021026016 | 3.2x2.5x0.6mm | TSX-3225 | 20.000000MHz | 18pF | +/-10ppm | +/-10ppm | -20to+75°C |
| X1E000021026316 | 3.2x2.5x0.6mm | TSX-3225 | 25.000000MHz | 18pF | +/-10ppm | +/-10ppm | -20to+75°C |
| X1E000021026416 | 3.2x2.5x0.6mm | TSX-3225 | 24.000000MHz | 18pF | +/-10ppm | +/-18ppm | -40to+85°C |
| X1E000021026516 | 3.2x2.5x0.6mm | TSX-3225 | 48.000000MHz | 12pF | +/-10ppm | +/-10ppm | -20to+75°C |
| X1E000021026616 | 3.2x2.5x0.6mm | TSX-3225 | 40.000000MHz | 18pF | +/-10ppm | +/-10ppm | -20to+75°C |
| X1E000021028516 | 3.2x2.5x0.6mm | TSX-3225 | 19.200000MHz | 12pF | +/-10ppm | +/-10ppm | -20to+75°C |
| X1E000021029516 | 3.2x2.5x0.6mm | TSX-3225 | 30.000000MHz | 9pF | +/-10ppm | +/-10ppm | -20to+75°C |
| X1E000021030116 | 3.2x2.5x0.6mm | TSX-3225 | 24.576000MHz | 12pF | +/-10ppm | +/-10ppm | -20to+75°C |
| X1E000021031216 | 3.2x2.5x0.6mm | TSX-3225 | 26.000000MHz | 7pF | +/-10ppm | +/-20ppm | -40to+85°C |
| X1E000021031516 | 3.2x2.5x0.6mm | TSX-3225 | 25.000000MHz | 18pF | +/-10ppm | +/-10ppm | -20to+75°C |
| X1E000021035016 | 3.2x2.5x0.6mm | TSX-3225 | 26.000000MHz | 9pF | +/-10ppm | +/-10ppm | -20to+85°C |
| X1E000021035216 | 3.2x2.5x0.6mm | TSX-3225 | 25.000000MHz | 20pF | +/-10ppm | +/-18ppm | -40to+85°C |
| X1E000021035616 | 3.2x2.5x0.6mm | TSX-3225 | 20.000000MHz | 10pF | +/-10ppm | +/-10ppm | -20to+70°C |
| X1E000021036316 | 3.2x2.5x0.6mm | TSX-3225 | 27.000000MHz | 18pF | +/-10ppm | +/-10ppm | -20to+85°C |
| X1E000021036716 | 3.2x2.5x0.6mm | TSX-3225 | 40.000000MHz | 10pF | +/-10ppm | +/-15ppm | -30to+85°C |
| X1E000021037516 | 3.2x2.5x0.6mm | TSX-3225 | 16.000000MHz | 9pF | +/-10ppm | +/-18ppm | -40to+85°C |
| X1E000021037716 | 3.2x2.5x0.6mm | TSX-3225 | 39.000000MHz | 8pF | +/-10ppm | +/-11ppm | -20to+85°C |
| X1E000021038416 | 3.2x2.5x0.6mm | TSX-3225 | 27.000000MHz | 11pF | +/-10ppm | +/-10ppm | -20to+75°C |
| X1E000021039416 | 3.2x2.5x0.6mm | TSX-3225 | 37.800000MHz | 8.5pF | +/-10ppm | +/-20ppm | -40to+85°C |
| X1E000021040316 | 3.2x2.5x0.6mm | TSX-3225 | 48.000000MHz | 16pF | +/-10ppm | +/-10ppm | -20to+75°C |
| X1E000021040816 | 3.2x2.5x0.6mm | TSX-3225 | 33.300000MHz | 9pF | +/-10ppm | +/-10ppm | -20to+75°C |
| X1E000021041016 | 3.2x2.5x0.6mm | TSX-3225 | 30.000000MHz | 7pF | +/-10ppm | +/-10ppm | -20to+75°C |
| X1E000021041716 | 3.2x2.5x0.6mm | TSX-3225 | 24.576000MHz | 9pF | +/-10ppm | +/-10ppm | -20to+75°C |
| X1E000021041816 | 3.2x2.5x0.6mm | TSX-3225 | 20.000000MHz | 9pF | +/-10ppm | +/-18ppm | -40to+85°C |
防疫电子哨兵系统用晶振X1E000021004716
在电子哨兵应用之前，以往都是靠人工查验需要至少半分钟的时间，人流量大或网络信号差是会造成拥堵情况，这时需要分配更多的人力物力，而如今的电子哨兵几秒钟即可完成查验通行，且大大降低了肢体接触感染的可能。在以前，这些信息需要市民手写登记，不仅等待时间长，而且容易造成个人信息泄露。这一切，在电子哨兵上岗后，都有了改变。在电子哨兵设备中晶振是少不了的元器件，起着很重要的作用
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