双极型中小功率晶体管开关时间参数计量专用样管校准规范双极型中小功率晶体管开关时间参数计量专用样管校准规范Specification for calibration of special measurement sample tubes for parameters of two-stage transistor switches
阻抗管吸声标准试样校准规范
Calibration Specification for Standard Sample in Impedance Tube Absorption
2020-11-26
JJF 1134-2005
专用工作测力机校准规范
Calibration Specification for Working Force Measuring Machines for Special Purposes
2005-04-28
JJF 1877-2020
水声材料声学性能参数测量系统(脉冲管法)校准规范
Calibration Specification for Acoustic Performance Parameters Measurement Systems of Underwater Acoustic Materials(Pulse Tube Method)
2020-11-26
JJG (电子) 04020-1989
高频中小功率晶体三极管噪声系数计量专用样管(试行)
Specification for verification of sample transistor specially intended to measure the noise factor of high frequency medium and low power triode transistor