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 California Code of Regulations (Last Updated: August 6, 2014)
 Title 13. Motor Vehicles
 Division 2. Department of the California Highway Patrol
 Chapter 2. Lighting Equipment
 Article 11. Deceleration Signal Lamp Systems

  § 732. Deceleration Performance.  

Latest version.
  • The output voltage, duty cycle, and flash rate of the control unit at a temperature of 24 + 5.5 C (75 ± 10 F), when 12.8 V dc is applied to the input terminal, shall be as shown in Table I when the control sensor is placed on a tilt table and slightly vibrated as the table is slowly rotated through the angles representing the specified vehicle deceleration rates.
    Image 1 within § 732. Deceleration Performance.​
    TABLE 1. TEST REQUIREMENTS FOR DECELERATION LAMPS
     
     
    Peak
    Deceleration
    Output
    relative
    Flash Rate
    On Time
    (g)
    (V)
    brightness
    (Hz)
    (%)
     
    0.0
    7.0
    1.0
    1.0
    50
    0.1
    —
    1.0
    1.5
    48
    0.2
    —
    1.0
    2.3
    46
    0.3
    —
    1.2
    3.4
    44
    0.4
    —
    1.4
    5.0
    42
    0.5
    —
    1.7
    7.6
    40
     
    (a) Deceleration. The deceleration at which the unit switches from a lower to a higher flash rate shall be within ± 0.05 g of the rate specified in Table I. If the unit operates at more steps than the required minimum, the additional values for each column shall lie on the smooth curve connecting the indicated values within the specified tolerances. The values specified in Table II apply to ramp-type inertial sensors for which the downward angles correspond to the deceleration and a tolerance of 3.0 deg applies to the tilt angle.
    Image 2 within § 732. Deceleration Performance.​
    TABLE II. TEST REQUIREMENTS FOR DECELERATION SENSOR
     
     
    Deceleration
    Forward tilt
    Degrees
    Corrected tilt
    (g)
    angle
    Dip correction
    angle
    0.0
    0.0
    0.0
    0.0
    0.1
    5.7
    0.8
    6.5
    0.2
    11.3
    1.6
    12.9
    0.3
    16.7
    2.4
    19.1
    0.4
    21.8
    3.2
    25.0
    0.5
    26.6
    4.0
    30.6
     
    (b) Output Voltage. The rms output voltage during the on portion of the flash cycle at the 1 Hz flash rate shall be within ± 5% of the specified value, measured at the lamp bulbs with daytime illumination on the automatic darkness sensor.
    (c) Relative Brightness. With the brightness of the lamp or its bulbs taken as 1.0 when measured with the rms output voltage specified for 0 g deceleration, the relative brightness of the lamp or bulbs at the other decelerations shall be within ± 25% of the specified values after the fifth flash.
    (d) Flash Rate and Percent on Time. The flash rate shall be within ± 15% of the specified value. The percent on time shall be within ± 10% of the specified value.
    (e) Correction for Front End Dip. Control sensors for vehicles with substantial front end dip upon braking, such as passenger vehicles and pickup trucks, shall have linear dip correction varying from 4 deg at 0.5 g or more deceleration to 0 deg at 0 g.

Note

Note: Authority cited: Section 26103, Vehicle Code. Reference: Sections 24012 and 26103, Vehicle Code.