Two-tone electric car horn contact preload how to adjust?

Electric size car horn sound through the speaker coil with current size. When the pre- contact pressure, the current flow through the speaker coil increases, the volume of the horn is increased , whereas the volume is reduced.

Contact pressure is normal , horn work by examining current and rated current to determine whether the match . If the operating current is equal to the rated current , then the contact pressure is normal ; such as operating current is greater than or less than the rated current , then the contact pressure is too large or too small , should be adjusted .

For cylindrical , spiral -shaped electric car horn , barium should loosen nut , then turn the adjusting nut ( counterclockwise rotation , the contact pressure increases, the volume increase ) to adjust ; to basin -shaped electric horn can be rotated volume adjustment screw ( counterclockwise rotation , the volume increases) to be adjusted. Adjustment can not be too hasty , generally every turn the adjusting nut more than 1 / 10 laps .

Electric speaker volume and sound quality adjustment is not completely independent, both of them are actually interrelated, so both will need repeated testing to get the best results. Car horn sound level from the car in front of 2m, 1.2m from the ground at the time of measurement , its value should be 90-118dB (A).