This standard defines the method for measuring the noise level of a vehicle security-sounding device. This standard does not define or limit device under test (DUT) frequencies, sounds or tones. However, this standard limits the frequencies that the noise level measurements may measure. Only frequencies between 500 Hz and 3,500 Hz shall be accepted for measurement purposes. If the DUT has multiple frequencies, only those that are within these limits shall be acceptable for measurement. Suitable spectral analysis equipment shall be used for the analysis of the frequencies emitted by the DUT. This need not be done at the time of testing.

The category of sounding devices that may be tested under this standard is broad. Since it is the intent of this standard to provide a level and equitable format for the measurement of vehicle security sounding devices, its application is intended to be broad enough to encompass all potential devices in use, past, present, and future. The list of sounding devices that may be measured under this standard shall include, but not be limited to, the following:

a) Electronic sirens (w/ internal oscillator and amplifier)

b) Electronic sirens (w/o internal oscillator and amplifier)

c) Mechanical sirens (motor driven)

d) Compressed air powered diaphragm horns

e) Loudspeakers (standard electromagnetic voice coil)

f) Piezo-electric speakers (w/o oscillators)

g) Piezo-electric horns (w/ oscillators)

h) Electromechanical horns