1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirelyvoluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefro
2、m, is the sole responsibility of the user.”SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions.QUESTIONS REGARDING THIS DOCUMENT: (724) 772-8512 FAX: (724) 776-0243TO PLACE A DOCUMENT
3、 ORDER; (724) 776-4970 FAX: (724) 776-0790SAE WEB ADDRESS http:/www.sae.orgCopyright 1989 Society of Automotive Engineers, Inc.All rights reserved. Printed in U.S.A.SURFACEVEHICLE400 Commonwealth Drive, Warrendale, PA 15096-0001STANDARDSubmitted for recognition as an American National StandardJ253RE
4、AF.DEC89Issued 1971-07Reaffirmed 1989-12Superseding J253 APR 84HEADLAMP SWITCHForewordThis Reaffirmed Document has been changed only to reflect the new SAE Technical Standards BoardFormat.1. ScopeThis document defines the test conditions, procedures, and performance specifications for 6-, 12-,and 24
5、-V manually actuated headlamp switches (circuit breaker(s) may be incorporated for circuit overloadprotection).2. ReferencesThere are no referenced publications specified herein.3. Definitions3.1 Headlamp Switch An operator-activated device intended primarily to control functioning of headlamps,park
6、ing lamps, tail lamps, and certain marking lamps. Secondarily, the device may control functioning ofvarious accessory and instrument lights.4. Test Requirements4.1 Test Equipment and Instrumentation4.1.1 POWER SUPPLYThe power supply shall comply with the following specifications:a. Output Current -
7、capable of supplying the continuous and in-rush currents of the design load(Reference: 4.2.1.1).b. RegulationDynamic - the output voltage at the supply shall not deviate more than 1.0 V from zero to maximumload (including in-rush current) and should recover 63% of its maximum excursion within 100 ms
8、.Static - the output voltage at the supply shall not deviate more than 2% with changes in static loadfrom zero to maximum (not including in-rush current), and means shall be provided to compensate forstatic input line voltage variations.c. Ripple Voltage - maximum 300 mV peak-to-peak.SAE J253 Reaffi
9、rmed DEC89-2-4.1.2 VOLTMETER0 to 30 V maximum full scale deflection, accuracy 1/2%.NOTEA digital meter having at least a 3-1/2 digit readout with an accuracy of 1% plus one digit isrecommended for millivolt readings.4.1.3 AMMETERCapable of carrying full system load current, accuracy 3%.4.2 Test Proc
10、eduresEnvironmental conditions have been selected for this document to help assure satisfactoryoperation under general customer use conditions. It is essential to duplicate specific environmental conditionsunder which the device is expected to function.4.2.1 ELECTRICAL LOADS4.2.1.1 The design load a
11、pplied to the switch is the electrical load specified by the number and type of bulbs (orother electrical load devices) to be operated by each circuit of the switch. For example, the design load forthe headlamp circuit may be four sealed beam headlamp units (2-4651 and 2-4652) and four-#194 bulbs.4.
12、2.1.2 The switch shall be operated at 6.4 V DC 0.2 for a 6-V system, 12.8 V DC 0.2 for a 12-V system, or25.6 V DC 0.2 for a 24-V system. These voltages shall be the open circuit voltage measured at the inputtermination on the switch.4.2.2 TEMPERATURE TEST PROCEDURES4.2.2.1 The switch shall be expose
13、d for 1 h without electrical load to each of the following temperatures: 25 C 5;74 + 0 C, 3 C; 32 + 3 C, 0 C. The switch shall be manually cycled at each temperature for tencycles at design load.4.2.2.2 The same switch shall be used for the endurance test described in 3.2.3.4.2.3 ENDURANCE TEST PROC
14、EDURE4.2.3.1 The switch shall be electrically connected to operate its design load (both primary and secondary circuitfunction design electrical loads) at a temperature of 25 C 5.4.2.3.2 The switch shall be operated for a minimum of 11 000 cycles1. One complete cycle shall consist ofsequencing throu
15、gh each position (with dwell in each position) and return without dwell in intermediatepositions to the initial position.The test equipment shall be arranged to provide the following switch operating time requirements:Travel Time: 0.1 to 0.5 s (time from one position to the next)Dwell Time: 1.0 to 2
16、.0 s (time in each position)Make and Break Rate: 130 to mm/s4.2.3.3 At the completion of the cycle testing, the switch shall be operated for 1 h in the headlamp position with thedesign load(s) connected.1. 11 000 cycles represents three cycles of headlamp switch operation every day for approximately
17、 10 years, or one cycle for each 4.5 miles driven for 100 000 miles with 50% night driving.SAE J253 Reaffirmed DEC89-3-4.2.4 VOLTAGE DROP TEST PROCEDURE4.2.4.1 The voltage drop from the input terminal(s) to the corresponding output terminal(s) shall be measured atdesign load before and after the com
18、pletion of the endurance test and shall be the average of threeconsecutive readings. These voltage drop readings should exclude the voltage drop across the circuitbreaker(s). If wiring is an integral part of the switch, the voltage drop measurement shall be madeincluding 75 mm 6 of wire on each side
19、 of the switch; otherwise the measurement shall be made at theswitch terminals.5. Performance Requirements5.1 During and after each of the cycles described in 4.2.2.1 and 4.2.3, the switch shall be electrically andmechanically operable.5.2 The voltage drop shall not exceed 0.3 V when measured as in
20、4.2.4, before and after completion of the testsdescribed in 4.2.3.PREPARED BY THE SAE AUXILARY DEVICES STANDARDS COMMITTEE OF THE SAE LIGHTING COORDINATING COMMITTEESAE J253 Reaffirmed DEC89RationaleNot applicable.Relationship of SAE Standard to ISO StandardNot applicable.ApplicationThis document de
21、fines the test conditions, procedures, and performance specifications for 6-,12-, and 24-V manually actuated headlamp switches (circuit breaker(s) may be incorporated for circuitoverload protection).Reference SectionThere are no referenced publications specified herein.Developed by the SAE Auxiliary Devices Standards CommitteeSponsored by the SAE Lighting Coordinating Committee
