 |
Chinese Classification
Professional Classification
ICS Classification
Latest
Value-added Services
|
| Standard Insuued on: 1999-03 |
GB/T 4854.7-1999 Acoustics-Reference zero for the calibration of audiometric equipment-Part 7：Reference threshold of hearing under free-field and diffuse-field listening conditions
声学 校准测听设备的基准零级 第7部分：自由场与扩散场测听的基准听阈
| Category No.: | GB | Valid Status: | superseded |
| Issued Organization: | CSBTS | Issued Date: | 1999-03-08 |
| Implemented Date: | 1999-9-1 | Abolished Date: | |
| Superseded Standard.: | GB/T 4854.7-2008 Acoustics - Reference zero for the calibration of audiometric equipment - Part 7: Reference threshold of hearing under free-field and diffuse-field listening conditions |
Superseded Date: | 2009-2-1 |
QC/T 454-1999
QC/T 466-1999
DB50/T 23-1999
FZ/T 95013-1999
DB37/ 265-1999
QC/T 461-1999
FZ/T 90104-1999
GB 50096-1999
GB/T 17695-1999
GB/T 17693.1-2008
TB 10219-1999
SL 234-1999
GB 4343.2-1999
GB 17691-1999
GB 14761-1999
GB 3847-1999
GB 17681-1999
GB/T 24040-1999
GB/T 17711-1999
SY/T 6358-1998
| Tel: +86-10-8572 5655 | Fax: +86-10-8581 9515 | Email: coc@codeofchina.com | QQ: 672269886 |
| Copyright: TransForyou Co., Ltd. 2008-2040 |