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 entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, 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. Copyright 2011 SAE International All rights reserved. No part of this publication m
3、ay be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside U
4、SA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visit http:/www.sae.org/technical/standards/J1378_201103SURFACEVEHICLERECOMMENDEDPRACTICEJ1378 MAR2011 Issued 1983-03 Stabilized 2011-03 Su
5、perseding J1378 JUL1998 Electric Hourmeter Specification RATIONALE This document has been determined to contain basic and stable technology which is not dynamic in nature. STABILIZED NOTICE This document has been declared “Stabilized“ by the SAE Marine Technical Steering Committee and will no longer
6、 be subjected to periodic reviews for currency. Users are responsible for verifying references and continued suitability of technical requirements. Newer technology may exist. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted with
7、out license from IHS-,-,-SAE J1378 Stabilized MAR2011 Page 2 of 7 ForewordThis Document has also changed to comply with the new SAE Technical Standards Board format. In5.3 and 5.6, was changed to m. References were added as Section 2. All other section numbers have changed.1. ScopeThis SAE Recommend
8、ed Practice establishes minimum requirements for electric hourmeters forgeneral vehicular applications.2. References2.1 Applicable PublicationThe following publication forms a part of this specification to the extent specifiedherein. Unless otherwise indicated, the latest revision of SAE publication
9、s shall apply.2.1.1 SAE PUBLICATIONAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.SAE J1113Electromagnetic Susceptibility Measurement Procedures for Vehicle Components (ExceptAircraft)NOTESAE J1113 is cancelled and is superseded by SAE J1113 Parts 1, 2, 3, 4, 11, 12, 13, 21, 2
10、2, 23, 25,26, 27, 41, and 42.3. Electric Hourmeter DescriptionA typical electric hourmeter is a true operating time indicator whichfunctions when electrically energized. The hourmeter is a DC operated device. There are three basicelectromechanical types among which are: Stepper Solenoids, Stepper Mo
11、tors, and Electrically OperatedClocks.4. CalibrationThe hourmeter indication shall be within 2% of the elapsed time or 0.1 h, whichever is greater,with nominal voltage applied at a temperature of 24 C 3 C.5. Effects of Environmental Conditions5.1 Temperature5.1.1 OPERATINGWith nominal voltage applie
12、d, the time indication shall not vary more than 1% of elapsed timein addition to the calibration error obtained in Section 4, while the unit is operating over the range of 7 to+54 C. No permanent damage shall result from operating the unit in a range of 40 to +82 C.Copyright SAE International Provid
13、ed by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J1378 Stabilized MAR2011 Page 3 of 7 5.1.2 STORAGEA 4-h exposure of the instrument to a temperature of 40 to +85 C shall result in no more thanan additional 1% of elapsed time perma
14、nent change from calibration error obtained in Section 4. The rateof temperature change during this test shall not exceed 2 C/min.5.2 Voltage VariationsThe time indication shall not change more than 1% of elapsed time in addition to thecalibration error obtained in Section 4 due to a voltage change
15、of a nominal 12-V system from 12 to 16 VDCand a nominal 24-V system from 24 to 32 VDC. Twelve and 24-V hourmeters shall not change more than 3%from the reading obtained in Section 4 at 11 and 22 V respectively.5.3 Abnormal Voltage Conditions5.3.1 TRANSIENT PROTECTIONThe instrument shall be capable o
16、f withstanding supply voltage transients withoutpermanent damage and shall remain within the calibration specification of Section 4 at the conclusion of thistest. The instrument shall be connected and operated for a total of 1 h with a means provided to impressupon the nominal battery voltage a repe
17、titive rectangular voltage pulse of plus and minus six times nominalbattery voltage with a duration of 300 ms and 1% duty cycle with a current of no more than 1.0 A. For someapplications which may have transient voltages having a magnitude, duration, or duty cycle exceeding theprevious requirements,
18、 contact the instrument manufacturer for recommendations. Further information ontransients may be found in SAE J1113.5.3.2 OVERVOLTAGE AND REVERSE POLARITYProvisions for protection against booster starts with double batteryvoltage and/or reversed polarity must be negotiated between the user and the
19、manufacturer.5.4 HumidityInstrument shall not have its function impaired due to exposure to 95% relative humidity at 38 Cfor 48 h.5.5 Vibration TestThe electric hourmeter shall be capable of withstanding without mechanical or electricalfailure 6 h of vibration, 2 h along each of the three mutually p
20、erpendicular axes, one axis to be perpendicular tomounting plane. The vibration tests shall be run at a double amplitude of 1.52 mm with the frequency varyingfrom 108010 Hz (20 g max) at intervals of 1 min. After completion of test, the calibration shall remain withintolerances as specified in Secti
21、on 4.5.6 Shock TestThe instrument shall be capable of withstanding without mechanical or electrical failure, thefollowing series of shocks and still maintain the calibration tolerances specified in Section 4.The unit shall be subjected to 12 shocks in each direction along each of the three mutually
22、perpendicular axes(72 total shocks), one axis to be perpendicular to the mounting plane. Each shock shall have an amplitude of44 to 55 g, half sine of 9 to 13 ms duration.6. Design Detail Recommendations6.1 Unless otherwise specified by user, dial printing shall be white, dial background shall be lo
23、w gloss black, andvisible portions of the instrument should exhibit low reflectivity; the indicating wheels or drums shall have whitenumerals on a low gloss black background, except for the tenths indicator, which shall have black numerals ona white background.6.2 All exposed surfaces shall be corro
24、sion resistant for limited exposure. NOTEIf instruments are required for installations in extreme environments, contact manufacturer forrecommendations.6.3 Instruments shall be moisture and dust resistant. (See note in 6.2.)Copyright SAE International Provided by IHS under license with SAENot for Re
25、saleNo reproduction or networking permitted without license from IHS-,-,-SAE J1378 Stabilized MAR2011 Page 4 of 7 6.4 The hourmeter case may be provided with studs for mounting by suitable U-clamps or similar means. Somehourmeters may have a flange for mounting.6.5 Typical envelope, mounting studs,
26、mounting flange, panel cutout, and terminal designations are displayed inFigures 1A to 4.FIGURE 1A(ENVELOPE) U-CLAMP MOUNTFIGURE 1BPANEL CUTOUTCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J137
27、8 Stabilized MAR2011 Page 5 of 7 FIGURE 2A(ENVELOPE) FLANGE MOUNTFIGURE 2BPANEL CUTOUTCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J1378 Stabilized MAR2011 Page 6 of 7 FIGURE 3A(ENVELOPE) FLAN
28、GE MOUNTFIGURE 3BPANEL CUTOUTCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J1378 Stabilized MAR2011 Page 7 of 7 FIGURE 4 TERMINALS6.6 Identification (Unless Otherwise Specified)6.6.1 To be legi
29、bly indicated on outside of case:a. Manufacturers or users part numberb. Manufacturers or users serial number and/or date of manufacture6.6.2 To be printed on dial and/or indicated on case: manufacturers or user s name and/or trademark.6.6.3 Electrical connections shall be clearly identified for pro
30、per wiring of instrument into circuit.7. Notes7.1 Marginal IndiciaThe change 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 SPEEDOMETER AND TACHOMETER COMMITTEECopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
