JJG488-1998校表仪.pdf

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1、中华人民共和国国家计量检定规程JJG488-1998校表仪WatchTester1998一11一16发布1999一05一01实施国家质量技术监督局发布JJG488-1998校表仪检定规程产乙0.O.O.O.~0.0.0.0.0.~口.0.0.飞乙乙JJG488-1998-0.。代替JJG488-1987VerificationRegulation.0.0JJG489-1987{、~~~~一。ww.o.o.o.o.o.0.0"4ofWatchTester本检定规程经国家质量技术监督局于1998年11月1

2、6日批准，并自1999年05月01日起施行。归口单位:全国时间频率计量技术委员会起草单位:山东省计量科学研究所本规程技术条文由起草单位负责解释d.IG488-1998本规程主要起草人:周桂兰(山东省计量科学研究所)刘孝俊(山东省计量科学研究所)王学福(山东省计量科学研究所).T.TG488-1998目录一概述·······················································································⋯⋯(1)二技术要求·

3、......................................................................................(1)三检定条件·......................................................................................(1)(一)环境条件······························································

4、·············⋯⋯(1)(二)标准设备···········································································⋯⋯(1)四检定项目和检定方法·.......................................................................(2)(一)外观及工作正常性检查··················································

5、·······⋯⋯(2)(二)机内晶体振荡器频率准确度的检定··········································⋯⋯(2)(三)测量误差的检定··································································⋯⋯(2)(四)采样时间的检查··································································⋯⋯(3)五检定结果的处理和检定周期·

6、..............................................................(3)附录校表仪检定记录格式·....................................................................(4)JJG488-1998校表仪检定规程本规程适用于新制造、修理后和使用中的校表仪的检定。概述各种时钟、秒表和手表(电子的或机械的)的走时准确度都是用相对标准时钟的速率表示。其单位一般为s/d,简称为日差。速率的快

7、慢主要取决于钟表内所用的主振器(石英晶振、摆轮等)的频率实际值相对于频率标称值的偏离程度。校表仪主要用于测定钟表的日差，通过调整使被校的钟表达到一定要求的走时准确度。日差的测量方法大都是利用传感器(声音的、电磁的)感知钟表发出的振荡信号，通过变换得出相应的电信号，用计数法测定电信号周期相对于标称值的偏差，计算后显示出日差值。校表仪广泛用于钟表的生产企业、产品质量检验机构及计量部门。二技术要求1校表仪应能在温度(0--40)IC、相对湿度<80%、电源电压220(1士10%)V的条件下，连续工作8ho2

8、测量范围:(0.00--9.99)s/d,(0.0--99.9)s/d,(0-999)s/do3测量分辨力:0.01s/d,0.1s/d,1s/do4测量误差:10.05s/d,13s/d,14s/do5机内晶振频率准确度:2x10-'--1x10-So三检定条件(一)环境条件6环境温度:(20士5)r。7相对湿度:(65115)%08电源:220(1110%)V,50(115%)Hz.9周围应无影响正常工作的振动、噪声及强电、磁场干扰。10检定前，被检