A52 长度计量 标准查询与下载

JJF 1118-2004 全球定位系统(GPS)接收机(测地型和导航型)校准规范

Calibration Specification for Global Positioning System (GPS) Receiver

JJG 306-2004 24m因瓦基线尺

24m Invar Wire

JJF 1064-2004 坐标测量机校准规范

Coordinate Measuring Machine Calibration Specification

JJF 1123-2004 基圆齿距比较仪校准规范

Calibration Specification for Base Circle Pitch Comparator

JJF 1119-2004 电子水平尺校准规范

Calibration Specification for Electronic Level Meter

JJF 1124-2004 齿轮渐开线测量仪器校准规范

Calibration Specification for Gear Involute Measuring Instruments

JJF 1122-2004 齿轮螺旋线测量仪器校准规范

Calibration Specification for Gear Helix Measuring Instruments

JJG 779-2004 车速里程表标准装置

Speed and Milege Meter for Standard Equipment

JJG 987-2004 线缆计米器

Cable Length Meter

JJG 70-2004 角度块

Angle Gauge Blocks

JJF 1113-2004 轴承套圈角度标准件测量仪校准规范

Calibration Specification of Angle Measuring Instrument for Bearing Ring

JJG 7-2004 直角尺

Squares

JJG 427-2004 带表千分尺

Micrometers with Gauge

JJG 46-2004 扭力天平

Torsion Balance

JJF 1116-2004 线加速度计的精密离心机校准规范

Calibration Specification for Linear Accelerometer Used Precision Centrifuger

JJG 220-2004 铁路轮对内距尺

Gauges for Measuring Distance Between Inside Rim Faces of Railway Wheels

BS EN ISO 23429:2004 六角槽的测量

This International Standard specifies gauges for hexagon sockets with tolerances as specified in ISO 4759-1.

Gauging of hexagon sockets

ASME MFC-3M-2004 用孔板、管接头和文杜利管测量管道中的液体流量

This Standard specifies the geometry and method of use (installation and flowing conditions) for orifice plates, nozzles, and Venturi tubes when they are inserted in a conduit running full, to determine the rate of the fluid flowing. It also gives necessary information for calculating flow rate and its associated uncertainty. It applies only to pressure difference devices in which the flow remains turbulent and subsonic throughout the measuring section is steady or varies only slowly with time and the fluid is considered single-phased. In addition, the uncertainties are given in the appropriate sections of this Standard for each of these devices, within the pipe size and Reynolds number limits which are specified. It deals with devices for which sufficient calibrations have been made to enable the specification of coherent systems of application and to enable calculations to be made with certain predictable limits of uncertainty. The devices introduced into the pipe are called primary devices. The term primary device also includes the pressure taps and the associated upstream and downstream piping. All other instruments or devices required for the measurement or transmission of the differential pressures are known as secondary elements, and in combination are referred to as the secondary devices. This Standard covers the primary devices; secondary devices will be mentioned only occasionally. The following primary devices are covered in this Standard: (a) orifice plates, which can be used with the following arrangements of pressure taps: (1) flange pressure taps, (2) D and D/2 pressure taps, (3) corner pressure taps. (b) nozzles: (1) ASME long radius nozzles. (c) Venturi tubes: (1) classical Venturi tubes. This Standard does not pipe or conduit sizes under 50 mm {2 in.} nominal. This Standard does not apply to ASME Performance Test Code measurements. The Standard is applicable to measurement of flow of any fluid, (liquid, vapor, or gas).

Measurement of Fluid Flow in Pipes Using Orifice, Nozzle, and Venturi Date of Issuance: 8/15/2005

ASTM E111-04 杨氏弹性模量、正切模量和弦切模量的标准试验方法

The value of Youngrsquo;modulus is a material property useful in design for calculating compliance of structural materials that follow Hookersquo;law when subjected to uniaxial loading (that is, the strain is proportional to the applied force). For materials that follow nonlinear elastic stress-strain behavior, the value of tangent or chord modulus is useful in estimating the change in strain for a specified range in stress. Since for many materials, Youngrsquo;modulus in tension is different from Youngrsquo;modulus in compression, it shall be derived from test data obtained in the stress mode of interest. The accuracy and precision of apparatus, test specimens, and procedural steps should be such as to conform to the material being tested and to a reference standard, if available. Precise determination of Youngrsquo;modulus requires due regard for the numerous variables that may affect such determinations. These include (1) characteristics of the specimen such as orientation of grains relative to the direction of the stress, grain size, residual stress, previous strain history, dimensions, and eccentricity; (2) testing conditions, such as alignment of the specimen, speed of testing, temperature, temperature variations, condition of test equipment, ratio of error in applied force to the range in force values, and ratio of error in extension measurement to the range in extension values used in the determination; and (3) interpretation of data (see Section 9). When the modulus determination is made at strains in excess of 0.25 %, correction should be made for changes in cross-sectional area and gage length, by substituting the instantaneous cross section and instantaneous gage length for the original values. Compression results may be affected by barreling (see Test Methods E 9). Strain measurements should therefore be made in the specimen region where such effects are minimal. FIG. 2 Load-Deviation Graph1.1 This test method covers the determination of Young's modulus, tangent modulus, and chord modulus of structural materials. This test method is limited to materials in which and to temperatures and stresses at which creep is negligible compared to the strain produced immediately upon loading and to elastic behavior.1.2 Because of experimental problems associated with the establishment of the origin of the stress-strain curve described in 8.1, the determination of the initial tangent modulus (that is, the slope of the stress-strain curve at the origin) and the secant modulus are outside the scope of this test method.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory requirements prior to use.

Standard Test Method for Young's Modulus, Tangent Modulus, and Chord Modulus

ANSI/ASME PTC19.5-2004 流量测量

The object of this Supplement is to define and describe the proper measurement of any flow required or recommended by any of the Performance Test Codes. Flow measurements performed as specified herein satisfy the requirements of all relevant ISO flow measurement standards in effect at the publication. This Supplement describes the techniques and methods if all flow measurements required of recommended by the Performance Test Codes. Newer flow measurement techniques of comparably high accuracy are included in order to provide alternative flow measurements for special situations in which deviations from the requirements of a code are agreed to be necessary. This is a supplementary document which does not supersede the mandatory requirements of any code unless such an agreement has been expressed in writing prior to test.

Flow Measurement