hydraulic natural frequency,液压固有频率

hydraulic power supply,液压动力源

hydraulic step motor,液压步进马达

hydraulic testing machine,液压式试验机

hydraulic vibrator,液压振动器

hydrodynamic noise,液体动力噪声

hydrofoil shape vehicle,水翼型拖曳体

hydrogen electrode,氢电极

hydrogen(pressure)gauge,氢压力表

hydrogen regulator,氢气减压器

hydrographic winch,水文绞车

hydrophone calibrator,水听器校准器

hydrophone streamer,海洋地城电缆；拖缆；漂浮电缆

hydrophone,水听器

hydrostatic level,液体静力水准仪

hydrostatic vater tand,静水槽

hygrograph,湿度计

hygrometer calibration chamber,湿度表检定箱

hygrometer,湿度表

hygrometeric tables,湿度查算表

hygrothermograph,温湿计

hypercycle theory,超循环理论

hyperstability,超稳定性

hypsometer,沸点测高表

hystersis,回差

hysteresis error,滞环误差；滞后误差

hysteresis error plus dead band,回差

hysteresis loop,滞环

I/O channel,输入输出出通道；I/O通道

ice point,冰点 ideal gas temperature scale,理想气体温标

ideal inherent equal percentage flow characteristic,理想固有等百分比注量特性

identifiability,可辨识性；能辨识性

ignition wire,点火线

illuminance transducer[sensor],照度传感器

illuminating aperture angle,照明孔径角

illuminating brightness,照明亮度

illuminating system,照明系统

illumination,照度

image electro-magnetic shift,象电位移

image plane,象面

image point,象点

image recognition,图象识别

image rotation,象旋转

image transdcer[sensor],图象传感器

imaging system,成象系统

immersion depth,浸入深度

immersion error,浸入误差

immersion line(of liquid-in-glass thermometer),（玻璃温度计的）浸没线

immersion testing,液浸法

immersion type probe,水浸探头

impact energy,冲击能量

impact hammer,冲击锤体

impact pendulnm,冲击摆锤

impact specimen support,冲击试校支架

impact test,冲击试验

impact testing machine,冲击试验机

impact toughness,冲击韧性

impact velocity of the pendulum,摆锤的冲击速度

impedance analysis,阻抗分析

impedance blood volume transducer[sensor],阻抗式血容量传感器

impedance head,阻抗头

imedance plane diagram,阻抗平面图

impedance respiratory frequency transducer[sensor],阻抗式呼吸频率传感器

impeller,旋浆

impregnated base strain gauge,浸胶基应变计

impulse distance meter,脉冲式测距仪

impulse function,冲激函数；脉冲函数

impulse precision sound level meter,脉冲精密声级计

impulse response,冲激响应；脉冲响应

impulsive sound,脉冲声

in-situ colour meter,现场水色计

in-situ extraction sampler,现场萃取采水器

im-situ salinometer,现场盐度计

in-situ seawater oxygenomter,海水溶解氧现场测定仪

inaccuracy,不精确度

inboard rotor,内重心转子

incline impact test,斜而冲击试验

ynclined-tube manometer,倾斜压力计

inclinometer,井斜仪

increase of area,断面增大率

increased safety electrical apparatus(Ex e),增安型电气设备（Ex e)

incremental control,增量控制

incremental motion control system,增量运动控制系统

incremental range,微调（增量）范围

incremental testing,增量测试

independent conforminty,独立一致性

independent linearity,独立线性度

index,指示器；指数；索引

index level,竖直度盘指标水准器

index(of an indicating device),（指示机构的）指示器

index of asymmetry,非对称性指数

index register,变址寄存器

indicated electrode,指示电极

indeicated strain,指示应变

indicated value,指示值

indicating device,指示装置；指示机构

indicating instrument,指示仪器仪表

indicating(measuring)instrument,（测量仪器仪表）的示值