1 范围···········································································。··············…… (1)
2 概述·················，········································································…… (1)
3 计量性能要求········································································……’““(1)
4 通用技术要求············································。························……’“‘…‘(1)
5 计量器具控制····································································……““·…‘(2)
5.1 检定条件·························································，·······················…… (2)
5.2 检定项目和检定方法··············································……‘·“‘’““‘’“’‘’‘”(2)
5.3 检定结果的处理·········。··························……‘……““·’‘’‘’“““‘””’‘’““‘(7)
5.4 检定周期···················································································一 (8)
附录A 检定证书内面格式 ·······························……““’“‘’‘’“‘’‘’‘’““‘”‘”‘(9)
附录B 检定结果通知书内面格式 ······················································…… (10)
数字脑电图仪及脑电地形图仪检定规程
范围
本规程适用于数字脑电图仪及脑电地形图仪的首次检定、后续检定和使用中检验。
本规程也适用于用脑电图仪作前置放大器的数字脑电图仪及脑电地形图仪的首次检
定、后续检定和使用中检验。对于这样的被检设备，应将用作前置放大器的脑电图仪看
作设备一部分，进行整体检定。
2 概述
数字脑电图仪是把人脑组织活动产生的生物模拟电信号经输人电路、放大器、数据
采集器及模数转换器等变换为数字量，并进行存储。所存储的数字量经分析、处理后，
回放显示或打印出时域脑电图。
脑电地形图仪是在数字脑电图仪中增加了对脑电信号的频域分析功能，并可将分析
结果以功率谱图、脑电地形图等形式显示或打印。
在本规程中将数字脑电图仪及脑电地形图仪简称为被检仪器。
计量性能要 求
电压测量:误差不超过土10%
3.2
时间间隔:误差不超过士5%
时间常数:0.03 s-0.1 s误差不超过140%
大于0.1:误差不超过120%
3.4 幅频特性:1 Hz-30 Hz偏差不超过+5%一一30
3.5
功率谱频率:误差不超过土5%
3.6
功率谱幅度:偏差不超过士10%
3.7
噪声电平:不大于5 IiV(峰一峰值)
3.8
共模抑制比:各道不小于80 dB
3.9 耐极化电压:加1 300 mV的直流极化电压，偏差不超过士5%
4 通用技术要求
4.1 被检仪器应标有生产厂名、型号、出厂编号，并且附件完整 (包括说明书及前次
检定证书)。
4.2 被检仪器不得有影响正常工作的机械损伤。键盘及鼠标接触良好、能平滑且连续
地在所显示的波形上选点测量
4.3 显示器可调至正常的亮度、对比度、色饱和度，显示清晰度良好。无明显的扫描
失真 。
