The term U refers to the frequency used as a reference point in electroacoustic measurements, and this standard uses 1000Hz as the reference frequency. 1.2 Normal working state refers to normal working state when the following conditions are met. A. Meet the specified measurement conditions: b. Connect the output terminal of the mixer to the specified load impedance; c. Connect different terminals according to the manufacturer's regulations; d. Unless otherwise specified, the tone controller, equalizer, filter, etc. in Budao are all placed in a straight position with amplitude frequency characteristics; e. The mixer is placed in the rated gain state. 1.3 The rated gain state sends the 1000Hz signal source electromotive force specified by the manufacturer to the audio input terminal of the mixer. Adjust the channel volume controller. If there are multiple volume controllers in the channel, place the total volume controller and group volume controller in the positions specified by the manufacturer, adjust the volume controller to make the output of the mixing console reach the normal T operating level specified by the manufacturer, that is, the rated gain state. 2 Measurement conditions 2.1 Natural conditions Temperature: 1O-35t Relative humidity: 45-80 Wing Atmospheric pressure: 35-1OSkPa 2.2 Power supply conditions AC power supply voltage tolerance:+10%, -5%
Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsBaijian and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China