JJG238-1995数字式时间间隔测量仪.pdf

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1、中华人民共和国国家计量检定规程JJG238-1995数字式时间间隔测量仪(试行)DigitalTimeIntervalMeasuringInstrument1995一05一31批准1996一05一01实施国家技术监督局发布JJG238-1995飞产。.口.0.口.钾。.0.伪。·。.0.0.0.O.心.。.}JJG238-1995。数字式时间间隔测量仪.今}代替JJG238-1981.0.?试行检定规程;JJG349-1984，心}通用电子计数器检定.心;VerificationRegulationofDigitalTime0a规程中时间测量部分心.心}JJG49

2、6-1987.心.IntervalMeasuringInstrument。}JJG602-1989.沪本检定规程经国家技术监督局于1995年05月31日批准，并自1996年05月01日起施行。归口单位:贵州省技术监督局起草单位:中国计量科学研究院本规程技术条文由起草单位负责解释JJG238-1995本规程主要起草人:马凤鸣(中国计量科学研究院)参加起草人:朱荣宝(贵州省计量测试技术研究所)周文样(贵州省计量测试技术研究所)JJG238-1995目录一概述·.......................................................

3、.....................................(1)二技术要求·......................................................................................(1)三检定条件·......................................................................................(2)(一)环境条件······································。。········

4、···························⋯⋯(2)(二)标准设备。··················。·······················································⋯⋯(2)四检定项目及检定方法·.......................................................................(2)(一)外观及工作正常性检查·，·······················································⋯⋯(2)(二)内部晶

5、振的检定·································。·································。·⋯(3)(三)测量误差的检定··································································⋯⋯(4)五检定结果的处理与检定周期·..............................................................(5)附录1检定证书内容和格式····································

6、························⋯⋯(6)附录2测时仪没有晶振频率输出时晶振指标的检定·············。················⋯⋯(7)附录3石英电子秒表的检定····························································⋯⋯(8)JJG238-1995数字式时间间隔测t仪试行检定规程本规程适用于新制造、修理后和使用中的测量值大于10ns的数字式时间间隔测量仪的检定。一概述数字式时间间隔测量仪是以数字显示时间间隔测量结果的仪器，以下简称测时仪。该类测时仪的工作原理是用准确

7、度已知的单位时间(时基)去度量被测的时间间隔，度量结果用电子计数器记录并显示。测量时选用的时基由石英晶体振荡器的信号经分频或倍频产生。原理方框图如图1所示。图1数字式时间间隔测量仪工作原理图该类测时仪用于测量—两个电脉冲(上升沿或下降沿)间的时间间隔;—单个电脉冲的宽度;—两个机械触点闭合与(或)断开间的时间间隔;—单个机械触点闭合或断开的持续时间;—单个电脉冲与单个机械触点动作间的时间间隔。二技术要求1内部晶振1·1频率波动:10一6一10一101.2频率准确度:10-5一102时间间隔测量JJG238-19952，j…时基:10ns一100ms，气︸乙测量范围

8、:10ns