A57 时间、频率计量 标准查询与下载

JJG(轻工) 80-1991 钟表用齿轮、宝石元件投影样板检定规程

Regulations for verification of projection templates of gears and gemstone components for clocks and watches

JJG(轻工) 81-1991 机械钟表校验仪检定规程

Calibration rules for mechanical clock calibrator

JJG(轻工) 84-1991 手表防水测试仪检定规程

Verification Regulations for Watch Waterproof Tester

JJG(轻工) 85-1991 手表防震试验仪检定规程

Verification Regulations for Watch Shockproof Tester

JJG 720-1991 宽频带频率稳定度时域测量装置检定规程

Verification Regulation of Wide Band Frequency Stability Measurement Set in Time Domain

JJG 721-1991 500MHz鉴相式相位噪声测量装置检定规程

Verification Regulation of 500MHz Phase Noise Measurement Set (Phase Detector Method)

JJG 722-1991 标准数字时钟检定规程

Varification Regulation of Standard Digital Clock

JJG 723-1991 时间间隔发生器检定规程

Verification Regulation of Time Interval Generator

ASTM D4686-91(2003) 频率分布的识别和转换

In measuring, testing, and experimenting, statistical tests are made to determine whether the observed effect of the introduction of a factor is real or simply due to chance. The appropriate statistical test to use depends on the kind of distribution used to model the data. Distribution identification is useful in selecting the most powerful statistical test. Note 28212;There are statistical tests which can be used for data for which a parametric distribution cannot be selected. But these non-parametric tests do not discriminate as well as the distribution-dependent tests. For certain types of data, a transformation can be made which will make it possible to use the hypothesis that the normal distribution is a suitable model for the transformed data. When this hypothesis can be made, the analysis of the data is made much easier.1.1 This guide gives the rudiments of identification of some of the most common and useful frequency distributions. It does not give rigorous identification. To achieve exactitude, the procedures similar to those given by Shapiro should be used.1.2 This guide provides a key to identify frequency distributions.1.3 This guide gives ways to select the proper transformation to use to transform a particular set of data to one which can be modeled by the normal distribution, if such a transformation can be found at all.1.4 This guide includes the following topics:Topic TitleSectionScope Referenced Documents Terminology Significance and Use Key to Distributions Binomial Frequency Distribution Poisson Frequency Distribution Normal Frequency Distribution Sample Average Distribution Other Distributions Transformations of Data

Standard Guide for Identification and Transformation of Frequency Distributions

CSA Z234.4-89-CAN/CSA-1989 全数字式日期和时间表示法,通用指令第1号.第3版本

Information Technology - Implementation and Operation of Customer Premises Cabling - Part 1

All-Numeric Dates and Times Third Edition; General Instruction No 1: December 1989

JJG 545-1988 频标比对器检定规程

Verification Regulation of Frequency Comparator

ITU-T O.6 FRENCH-1988 1020 Hz参考测试频率

The intent of this Recommendation is to specify a single nominal reference frequency of 1020 Hz in order to provide guidance to manufacturers and Administrations in the design and operation of new equipment and systems. This Recommendation is not intended to have an effect on existing equipment or systems except where modifications are required to allow for interworking. For instance, an older analogue exchange would need to be provided with new reference frequency capability if circuits were provided between it and digital exchanges.

1020 Hz Reference Test Frequency

ITU-T O.6 SPANISH-1988 1020 Hz参考测试频率

The intent of this Recommendation is to specify a single nominal reference frequency of 1020 Hz in order to provide guidance to manufacturers and Administrations in the design and operation of new equipment and systems. This Recommendation is not intended to have an effect on existing equipment or systems except where modifications are required to allow for interworking. For instance, an older analogue exchange would need to be provided with new reference frequency capability if circuits were provided between it and digital exchanges.

1020 Hz REFERENCE TEST FREQUENCY

JJG(航天) 29-1987 高稳定度标准频率源短期频率稳定度检定规程

Verification rules for short-term frequency stability of high-stability standard frequency source

JJG 492-1987 铯束原子频率标准检定规程

Verification Regulation of Cesium Beam Frequency Standard

JJG 509-1987 PP27数字工频频率计试行检定规程

Verification Regulation of Digit Industrial Frequency Meter Model PP27

JJG 503-1987 PB-2型十进频率仪检定规程

Verification Regulation of Model PB-2 Decimal Frequency Meter

JJG 502-1987 频率合成器检定规程

Verification Regulation of Frequency Synthesizer

JJG(航天) 25-1987 XD-40型电秒表校验仪检定规程

Verification Regulations for XD-40 Electric Stopwatch Calibrator

JJG 433-1986 比相仪检定规程

Verification Regulation of Phase Comparator