美标 SAE J 994 倒车蜂鸣器性能试验

test or certification item 测试或解读名称: sae j 994 - alarm backup倒车蜂鸣器性能试验

test or certification info 测试和解读相关内容:

low temperature test
‧test temperature :-40±3°c
‧test duration :2 hr
high temperature test
‧test temperature : 85±3°c
‧test duration :2 hr
rain test
‧the rate of rain deposit :2.5(+1.6/-0) mm/min
‧deliver angle from nozzle :45°
‧test duration :2 hr
vibration test resonance search test
‧frequency / displacement :10 ~ 27 hz / 6.76mm
‧frequency / acceleration :27 ~ 500 hz / 10g
‧sweep duration :15m
vibration test resonance dwell test
‧vibration frequency :resonance frequency
‧acceleration :10g
‧test direction :x axis、y axis & z axis
‧test duration :30 min/axis
vibration test vibration cycling test
vibration test vibration cycling test
‧frequency :27 ~ 500 hz
‧acceleration :10 g
‧sweep duration :15 min
‧test duration :3 hr
‧test direction :x、y、z axis
‧operate time :last 15 min
corrosion test 
‧type of solution to be sprayed :nacl
‧salt solution concentration :5±1%\
‧ph value of solution :ph 6.5 ~ 7.2
‧temperature in chamber :35(+1.1/-1.7)°c
‧the rate of salt deposit :1~2 ml/hr/80cm2
‧test duration :50 hr (24hr exposure and 1hr dry, 2 cycles)
high pressure hot water test
‧water temperature :85 °c
‧water pressure :above 6.9 mpa
‧water flow rate :above 18.9 l/min
‧nozzle angle :15°
‧spray distance :below 300 mm
‧test period :spray 10sec(min) in each 30sec(max)
dust test
‧type of dust :arizona dust
‧dust :4.5 kg/m3
‧stirring time :2 sec
‧suspending time :15 min
‧testing duration :5 hr
endurance test at low temperature
‧test temperatur :-40 °c±3°c
‧test duration :4 hr
‧operating time :30 sec on / 30 sec of
endurance test at high temperature
‧test temperature :85 °c±3°c
‧test duration :4 hr
‧operating time :30 sec on & 30 sec off
endurance test at room temperature
‧tes temperature :25 °c±11°c
‧test duration :100 hr
‧operating time :30 sec on & 30 sec off