Reliability Experiment Standards
可靠性实验标准（部分） | ||||
No. | Experimental project | Number of test samples | Test conditions | Judgment criteria |
1 | Drop test | 39pcs/3lot | Workpiece weight 150g ± 10g, height 1.5m; (6 sides+4 corners) * 4 drops | △Sens≤1dB |
2 | Vibration testing | 39pcs/3lot | 12 minutes in each of the X/Y/Z directions, with a frequency of 20-2000Hz and a peak acceleration of 20g | |
3 | free fall test | 39pcs/3lot | Drum drop machine, drop height of 1m, frequency of 300 times | |
4 | Structural impact | 39pcs/3lot | 10000g, 0.1ms pulse width, 3 times in X/Y/Z directions, recovered for 2 hours after the experiment | |
5 | Anti blowing | 39pcs/3lot | 0.45MPa, 3cm away from the sound inlet, lasting for 10s, the air gun diameter needs to be greater than the product diameter | Meet specification requirements |
6 | ESD experiment | 3pcs/3lot | HBM: 100pF, 1500ohms, ± 3kV direct contact I/O pin discharge | Meet specification requirements |
7 | Temperature shock (pre-treatment) | 25pcs/3lot | -40 ℃/15min, 125 ℃/15min, cycle 100 times, and recover for 2 hours after the test | △Sens≤3dB |
8 | HAST testing (preprocessing) | 30pcs/3lot | 130 ℃/85% RH/96 hours, the product is at the upper limit voltage of the specifications, and it will recover for 2 hours after the test | |
9 | High temperature storage | 25pcs/3lot | 105 ± 3 ℃, 1000H, recovered for 2H after test | |
10 | Low temperature storage | 25pcs/3lot | -40 ± 3 ℃, 1000H, recovered for 2H after the test | |
11 | High temperature power on | 77pcs/3lot | 105 ± 3 ℃, product at the upper limit voltage of specifications, 1000H, restored to 2H after the test | |
12 | Low temperature power on | 32pcs/3lot | -40 ± 3 ℃, product at the upper limit voltage of specifications, 1000H, restored to 2H after the test | |
13 | High temperature and high humidity power on (pre-treatment) | 25pcs/3lot | 85 ± 3 ℃, 85% RH, the product is at the upper limit voltage of the specification (3.6V), 1000H, recovered for 2H after the test | |
典型规格频响和相位曲线
1. The above frequency response curve and phase curve are typical parameter curves of LMA2718B381-A2NC noise reduction silicon microphone;
2. In addition to having high requirements for signal-to-noise ratio, the flatness of the low-frequency response (below 50Hz) and the consistency of the phase curve are crucial factors for ANC noise reduction silicon microphone. The low frequency response of the ANC noise reduction silicon microphone in Lingmai Acoustics can extend its flatness to around 20Hz, providing effective protection for the pickup process of the low frequency noise reduction function;
