GB/T 12106-2026Requirements and methods of environmental testing for electrophonic musical instruments (English PDF)

5.2 Mechanical Environment Testing

5.2.1 After the vibration test, the test specimen should be able to function normally.

5.2.2 After the static pressure test, the safety factor of the test specimen shall meet the requirements of Table 2.

5.2.3 The test sample shall function normally after the free drop test.

6.1 Climate and Environmental Testing

6.1.1 High Temperature Load Test Place the unpackaged test sample into a test chamber at a temperature of (40±2)°C, turn on the power supply to the test sample, and input an appropriate frequency signal or play a program. Play the demonstration piece, set the main volume control to provide 1/8 of the unclipping output power to the rated load from the test sample, and operate continuously for 2 hours. Then, [the test sample is then subjected to further testing]. The sample was inspected.

Note. The digital interface controller for electric musical instruments should be checked after 2 hours of continuous full-load operation.

6.1.2 High-temperature storage test The packaged test sample was placed in a test chamber at a temperature of (55±2)°C for 24 hours. After removing the test sample and allowing it to recover for 2 hours, the sample was then subjected to further treatment. The sample was inspected.

6.1.3 Damp heat test The unpackaged test sample was placed in a test chamber at a temperature of (40±2)°C and a relative humidity of (93±3)% for 48 hours. Afterwards, the sample was subjected to further testing. The sample was inspected.

6.1.4 Low Temperature Load Test Place the unpackaged test sample into a test chamber at a temperature of (0±2)°C, turn on the power supply to the test sample, and input an appropriate frequency signal or play a video. The demonstration piece was set to allow the test sample to provide 1/8 of the unclipping output power to the rated load. After 1 hour of continuous operation, the test sample was removed. The test sample was examined 2 hours after recovery.

Note. The digital interface controller for electric musical instruments should be checked after 1 hour of continuous full-load operation.

6.1.5 Low-temperature storage test Place the packaged test specimen into a test chamber at a temperature of (-25±2)°C. (To prevent condensation, it is permissible to wrap the test specimen in plastic.) Seal the film (if necessary, place a desiccant inside the sealing sleeve) and keep for 24 hours. Remove the test sample, allow it to recover for 2 hours, and then proceed with the test. examine.

6.1.6 Thermal Cycling Test Follow these steps.

a) Place the unpackaged, unpowered test sample into a test chamber pre-adjusted to a low temperature T1.-10°C, and leave it for t1.1h;

b) Transfer the test sample from the test chamber to a test chamber pre-adjusted to a high temperature T2.50°C, and place it for t1.1h;

c) The conversion time conforms to the specification of t2.2min~3min. Within the conversion time t2, the test sample is transferred to the low-temperature chamber for further processing. A loop;

d) As shown in Figure 1, the loop count is 5 times;

e) Remove the test sample and examine it.

6.1.7 Salt spray test Place the unpackaged complete machine or external metal parts into a salt spray test chamber conforming to GB/T 2423.17-2024, and the concentration of the salt solution... The concentration (mass fraction) should be (5±1)%, the temperature should be (35±2)°C, the pH should be between

6.2 Mechanical Environment Testing

6.2.1 Vibration Test Secure the unpackaged test specimen (in its non-operating state) in its normal operating position for vibration testing in accordance with GB/T 2423.10-2019. On the test platform, the center of gravity of the test specimen is placed in the central area of the test platform, and the test conditions are carried out sequentially in the vibration directions of the X, Y, and Z axes according to Table 3. Vibration tests under test conditions 1 and 2.

6.2.2 Static pressure test Place the packaged test specimens on the test bench of the packaging compression testing machine according to the stacking direction indicated on the packaging box. A static pressure strength test is carried out by applying a load F on the top, and the safety factor is calculated according to formula (1).

6.2.3 Free Fall Test

6.2.3.1 The test specimen, in its packaged state, shall undergo a free drop test in the order of face, edge, and corner. The test platform and the test specimen shall begin to fall. The position and status at that time shall comply with the requirements of GB/T 2423.7-2018.