Home / Standards / GB/T 21271-2026 GB/T 21271-2026 Active Vacuum technology—Noise measurement for vacuum pumps 真空技术 真空泵噪声测量 Standard Type GBT ICS 23.160 CCS J78 Status 现行 Issue Date 2026-01-28 Implementation 2026-05-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A