TH type standard percussion is a standard percussion sound source for measuring the acoustic insulation performance of building floor percussion. Its performance indexes meet the requirements of national standard GB/T19889.7 Building Acoustic Insulation Measurement Specification and JJF 1652-2017 Standard percussion calibration specification. The frame of the percussion is composed of steel plate and aluminum plate, with solid structure and stable operation.

Technical parameter：

Number of hammers: 5
Impact hammer weight: 500g±10g each
Distance between two adjacent hammers: 100mm
Impact time interval: 100ms±5ms (10 times per second)
Free fall distance: 40mm, adjustable
Weight: 30kg
Power supply: rechargeable lithium battery

Code for design of residential sound insulation:
According to the Code for Design of Residential Sound Insulation, the Ministry of Construction sets the indoor noise limit for residential buildings at 40 decibels during the day and 30 decibels at night for bedrooms and study rooms. The standard is not set by the environmental protection department, which does not use it as a basis for law enforcement.
Noise prevention measures should be taken in the layout and construction of residences. The allowed noise level of bedrooms and living rooms during the day (with windows closed) is 50dB (A sound level), and the allowed noise level at night is 40dB (A sound level).
The weighted standardized impact sound pressure level of the floor shall not be greater than 75dB.
Structural measures should be taken to improve the impact sound insulation performance of floor slabs.
The sound insulation quantity of air acoustic metering, floor slab should not be less than 40dB, the separation of residential and non-residential space, floor slab should not be less than 55dB, partition wall should not be less than 40dB, external wall should not be less than 30dB, door should not be less than 25dB.