内容简介
JJF（黔）57-2021网络时间（NTP）服务器校准规范
Calibration Specification of Network Time Servers Based on Network Time Pr otocol
目 录
引言·························································································（1）
1 范围 ·····················································································（1）
2 引用文件 ···············································································（1）
3 概述 ·····················································································（1）
4 计量特性 ···············································································（2）
4.1 秒脉冲 ···············································································（2）
4.2 主振器性能 ·········································································（2）
4.3 时间保持偏差 ······································································（2）
4.4 NTP 同步偏差·······································································（2）
5 校准条件 ···············································································（2）
5.1 环境条件 ············································································（2）
5.2 测量标准及其他设备·····························································（3）
6 校准项目和校准方法································································（4）
6.1 校准项目············································································（4）
6.2 校准方法 ············································································（4）
7 校准结果表达与处理································································（7）
7.1 校准记录 ············································································（7）
7.2 校准结果的处理···································································（7）
8 复校时间间隔 ·········································································（8）
附录 A 网络时间服务器 NTP 同步偏差校准结果的不确定度评定示例 ·······（9）
附录 B 校准记录格式···································································（14）
附录 C 校准证书内页格式·····························································（15）
1 范围
本规范适用于采用网络时间协议（Network Time Protocol, NTP）进行网络授时的网络时间服务器的校准。
2 引用文件
本规范引用了下列文件：
JJG 180 电子测量仪器内石英晶体振荡器
JJG 181 石英晶体频率标准
JJG 292 铷原子频率标准
JJF 1180—2007 时间频率计量名词术语及定义
JJF 1403—2013 全球导航卫星系统（GNSS）接收机（时间测量型）校准规范
JJF 1724—2018 时码发生器校准规范
凡是注日期的引用文件，仅注日期的版本适用于本规范；凡是不注日期的引用文件，其最新版本（包括所有的修改单）适用于本规范。