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: (412) 772-8512 FAX: (412) 776-0243TO PLACE A DOCUMENT
3、 ORDER; (412) 776-4970 FAX: (412) 776-0790http:www.sae.orgCopyright 1988 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 StandardJ249REV.JUN88Issued 197
4、2-02Revised 1988-06Superseding J249 FEB72(R) MECHANICAL STOP LAMP SWITCHForewordThis Document has not changed other than to put it into the new SAE Technical Standards BoardFormat.1. ScopeThe mechanical stop lamp switch is an operator activated mechanical device intended primarily tocontrol the func
5、tioning of the stop lamp and high mounted stop lamp circuits. Secondarily, the device maycontrol the functioning of various accessories, such as disengaging cruise control, with operator actuation ofbrake pedal.1.1 PurposeThis standard defines the test conditions, procedures, and performance specifi
6、cations for 6-, 12-,and 24-V manually actuated mechanical stop lamp switches.2. ReferencesThere are no referenced publications specified herein.3. Test Requirements3.1 Test Equipment and Instrumentation3.1.1 POWER SUPPLYThe power supply shall comply with the following specifications:a. Output Curren
7、tCapable of supplying the continuous and in-rush currents of the design load(reference paragraph 3.2.1.1).b. Regulation:DynamicThe 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 withi
8、n 100 ms.StaticThe 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 VoltageMaximum 300 mV peak-to-peak.SAE J249 Revi
9、sed JUN88-2-3.1.2 VOLTMETER0 30 V maximum full scale deflection, accuracy 1/2%.NOTEA digital meter having at least 3-1/2 digit readout with an accuracy of 1% plus one digit isrecommended for millivolt readings.)3.1.3 AMMETERCapable of carrying full system load current, accuracy 3%.3.2 Test Procedure
10、sEnvironmental conditions have been selected for this standard to help assure satisfactoryoperation under general customer use conditions. It is essential to duplicate specific environmental conditionsunder which the device is expected to function.3.2.1 ELECTRICAL LOADS3.2.1.1 The design load applie
11、d 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 stop lamp circuit may be two #1157 (high current filament) and high mounted stop lamp circuit may betwo
12、 #922 bulbs.The switch shall be operated at 6.4 0.2 V DC for a 6 V system, 12.8 0.2 V DC for a 12 V system, or 25.6 0.2 V DC for a 24 V system. These voltages shall be open circuit voltage measured at the inputtermination on the switch.3.2.2 TEMPERATURE TEST PROCEDURES3.2.2.1 The switch shall be exp
13、osed for 1 h without electrical load to each of the following temperatures: 25 5 C;74 + 0 C, 3 C; 32 + 3 C, 0 C. The switch shall be manually cycled at each temperature for tencycles at design load.3.2.2.2 The same switch shall be used for the endurance test described in 3.2.3.3.2.3 ENDURANCE TEST P
14、ROCEDURE3.2.3.1 The switch shall be electrically connected to operate its design load (both primary and secondary circuitfunction design electrical loads) at a temperature of 25 5 C.3.2.3.2 The switch shall be operated for a minimum of 300 000 cycles. One complete cycle shall consist ofenergizing an
15、d de-energizing the design load (with a dwell in each position).The test equipment shall be arranged to provide the following switch operating time requirements:Travel Time: 0.10.5 s (time from one position to next)Dwell Time: 1.02.0 s (time in each position)Make and Break Rate: 1015 mm/sNOTE(300 00
16、0 cycles represents 82 cycles of switch operation every day for approximately 10 years, or3 cycles for each 1.0 mile driven 100 000 miles.)3.2.4 VOLTAGE DROP TEST PROCEDURE3.2.4.1 The voltage drop from the input terminal(s) to the corresponding output terminal(s) shall be measured atdesign load befo
17、re and after the completion of the endurance test and shall be the average of threeconsecutive readings. If wiring is an integral part of the switch, the voltage drop measurement shall bemade including 75 6 mm of wire on each side of the switch terminals.SAE J249 Revised JUN88-3-4. Performance Requi
18、rements4.1 During and after each of the cycles described in 3.2.2.1 and 3.2.3, the switch shall be electrically andmechanically operable.4.2 The voltage drop shall not exceed 0.3 V when measured as in 3.2.4, at the beginning and after the testdescribed in 3.2.3.5. Notes5.1 Marginal IndiciaThe change
19、 bar (l) located in the left margin is for the convenience of the user in locatingareas where technical revisions have been made to the previous issue of the report. An (R) symbol to the leftof the document title indicates a complete revision of the report.PREPARED BY THE SAE AUXILIARY DEVICES SUBCO
20、MMITTEEAND SPONSORED BY THE SAE LIGHTING COMMITTEESAE J249 Revised JUN88RationaleNot applicable.Relationship of SAE Standard to ISO StandardNot applicable.ApplicationThis standard defines the test conditions, procedures, and performance specifications for 6-, 12-,and 24-V manually actuated mechanical stop lamp switches.Reference SectionThere are no referenced publications specified herein.Developed by the SAE Auxiliary Devices SubcommitteeSponsored by the SAE Lighting Committee
