working temperature,工作溫度

World Factory Instrumentation Protocol;World FIP,World FIP總線（世界工厂儀表協議）

world model,全球模型；世界模型

wound primary type current transformer,繞線式電流互感器

write,寫

writing speed,記錄速度

x-radiation thickness meter,x射線厚度計

X-ray,X射線；倫琴射線；X光

X-ray absorption spectrometer,X射線吸收式光譜儀

X-ray analysis,X射線分析法

X-ray analyzer,X射線分析器

X-ray apparatus for structure analysis,結构分析用X射線分析

X-ray beam stop,X射線光束截捕器

X-ray cinematography,X射線電影攝像法

X-ray controller,X射線控制器

X-ray crystal spectrometer,X射線晶体光譜儀

X-ray detector,X射線探測器

X-ray diffraction analysis,X射線衍射分析法

X-ray diffractometer,X射線衍射儀

X-ray energy dispersive spectrometr,X-射線能量分散譜儀

X-ray energy spectrometr,X射線能譜儀

X-ray filter,X射線過濾器

X-ray fluoremetry logger,X射線熒光測井儀

X-ray fluoresce readout analyser,X射線熒光直讀分析儀

X-ray fluorescence analysis,X射線熒光分析法

X-ray fluorescent emission spectrometer,X射線熒光發射光譜儀

X-ray fluorimeter,X射線熒光儀

X-ray fluorimeter in borehole,井下X射線熒光儀

X-ray goniometer,X射線測角儀

X-ray high voltage generator,X射線高壓發生器

X-ray intensity,X射線強度

X-ray monochromator,X射線單色器

X-ray photo-electron spectrometer (XPS),X射線光電子能譜儀

X-ray photo electron spectroscopy (XPS),X射線光電子能譜法

X-ray powder diffractometer,X射線粉末衍射儀

X-ray spectrograph,X射線攝譜儀

X-ray spectrometer,X射線光譜儀

X-ray spectrometer arrangement,X射線分光裝置

X-ray spectrum,X射線光譜

X-ray television apparatus for industry,工業X射線電視裝置

X-ray transducer [sensor],X射線傳感器

X-ray tube,X射線管

X-ray tube current,X射線管電流

X-ray tube head,X射線管頭

X-ray tube rating charts,X射線管負荷特性曲線

X-ray tube shield,X射線管防護罩

X-ray tube voltage,X射線管電壓

X-ray tube window,X射線管窗口

X-ray wave length dispersive spectrometer,X射線波長色散譜儀

X-Y recorder,XY記錄儀

Y-modulation,Y調制角

yaw probe,偏流側向探頭

yield point,屈服點

yield strength,屈服強度

yoke,支架；磁軛

yoke method,极間法

z-domain,Z域

z-plane,Z平面

z-transfer function,Z（變換）傳遞函數

z-transform,Z變換

zenith distance,天頂距

zero,零點；零位

zero adjustment,調零裝置

zero-based conformity,零基一致性

zero-based linearity,零基線性度

zero calibration gas,零點校准气

zero capacitance,零電容

zero displacement value,零位位移植

zero drift,零點漂移

zero elevation,零點提升

zero error,零點誤差

zero inductance,零電感

zero-input response,零輸入響應

zero knives linear,零刀聯線

zero-length spring gravimeter,零長彈簧重力儀

zero-line oscillating,零線抖動

zero-line [reference] marker,零線裝置

zero-measurand output,零輸出

zero output base line,零輸出基線

zero point,零點

zero-point output,零點輸出

zero scale mark,零（標度）標記；零標度線

zero shift,零點遷移[偏移]

zero-state response,零狀態響應

zero suppression,零點下降

zero variation,不回零位

zigzag scan,Z形掃查；鋸齒形掃查

zinc oxide series gas sensor,ZnO系气敏元件

zinc oxide varistor,氧化鋅電壓敏電阻器

zirconia sensor,氧化鋯傳感器

zirconium doxide oxygen analyzer,氧化鋯氧分析器