目 录
1 范围············································································。···············、、二(1)
2 概述···4·······················，······························································…… (1)
3 计量性能要求···································································。··········…… (1)
4 通用技术要求···················。··························································…… (2)
5 计量器具控制··························································。···················…… (2)
6 检定条件··················，··························。······································…… (2)
7 检定项目及检定方法·····································································…… (3)
7.1 外观及工作正常性检查·······························································…… (3)
7.2 内部晶振各项指标的检定························································，·、··、·… (3)
7.3 时间间隔测量不确定度的检定······················································…… (3)
7.4 时间间隔测量范围的检定··············································。·············…… (4)
8检定结果的处理及检定周期·.................................................................(5)
附录 检定证书内面格式 ·....................................................................... (6 )
范 围
本规程适用于最小间隔为1 ns的精密时间间隔测量仪的首次检定和后续检定。
2 概述
精密时间间隔测量仪测量时，将被测间隔分为两部分:大于一个时基的部分，采用
普通数字式时间间隔测量仪的原理，即累计时基脉冲的个数;小于一个时基的部分，用
模拟内插法、数字游标法或模/数 (A/D)变换法进行。测量分辨力理论上可达几个ps,
但实际上由于噪声的影响，造成测量显示不稳定，目前只能做到100 pso
精密时间间隔测量仪 (以下简称测量仪)，广泛地用在计量、通讯、高能物理等领
域 。
计t性能要 求
3.1 内部晶振
3.1.1 日老化率:优于1 x 10-8
3.1.2 开机特性:优于3 x 10-8
3.1.3 频率准确度:优于1x10一”
3.1.4 频率稳定度:优于1 x 10-10/1 s
3.2 时间间隔测量
3.2.1 被测信号形式:
两个正脉冲、两个负脉冲、一个正 (负)脉冲与一个负 (正)脉冲间的时间间隔;
单个正、负脉冲的宽度。
3.2.2 被测信号电平:TTL.
3.2.3 测量范围:1 ns-10 s
3.2.4 测量的标准不确定度
测量的标准不确定度由以下几部分组成:
u1:由分辨力和系统噪声引人的标准不确定度，15~100 ps;
u2:由触发电平引人的标准不确定度，50 mV/信号斜率;
u3:由两输人通道延迟差引人的标准不确定度，1 ns;
