Home / Standards / GB/T 6511-1986 GB/T 6511-1986 Precision method for free-field calibration of φ23.77mm standard condenser microphones by reciprocity technique 采用互易技术对φ23.77mm标准电容传声器进行自由场校准的精密方法 Standard Type GBT ICS N/A CCS N/A Status N/A Issue Date N/A Implementation N/A Responsible Dept N/A Drafting Unit N/A