 |
Chinese Classification
Professional Classification
ICS Classification
Latest
Value-added Services
|
| International Standard Category: Acoustic measurements and noise abatement in general |
JJG 991-2004 Verification Regulation of Aural Impedance Audiometers
阻抗听力计检定规程;
| Category No.: | 17.140.01 | Valid Status: | superseded |
| Issued Organization: | AQSIQ | Issued Date: | 2004-9-21 |
| Implemented Date: | 2004-12-21 | Abolished Date: | |
| Superseded Standard.: | JJG 991-2017 Audiometric Equipment—Instruments for the Measurement of Aural Acoustic Impedance/Admittance |
Superseded Date: | 2018-5-20 |
| Tel: +86-10-8572 5655 | Fax: +86-10-8581 9515 | Email: coc@codeofchina.com | QQ: 672269886 |
| Copyright: Foryou Tech Co., Ltd. 2008-2020 |