Trax (WEM-200) series & Pilot parts Assembly update and FCC assessment Gilles Ngningha Development Centre Sensors Issue date: /02/2022 Document status: in work () / under review ( ) / released (x) / obsolete ( ) Document reference MDYYTxxx revx.x SKF Internal use only 1/9 Job title HW engineer Signature / Date GN Job title Signature / Date Certification Engineer FE Job title Signature / Date No. Report information Author Gilles Ngningha Proof-reader Franck Ernoul Approver Related reports /
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Distribution list Requester Distribution Name Document reference MDYYTxxx revx.x SKF Internal use only 2/9 Revision index Revision content Rev1.0 Initial release Release Date
/06/2021 Rev 2.0 Antenna gain comparison added between old and and new design 27/10/2021 Document title changed Rev 3.0 Document is also valid for pilot parts -> added in the change letter update Rev 4.0 Product Pictures added 07/12/2021 09/02/2022 Notice of Confidentiality This Technical Report (the Report) may not, without prior written consent of SKF, be distributed, shown to, circulated, quoted or referred to outside the SKF Group. The Report contains information of a confidential and sensitive nature to SKF and the contents of this Report are the copyright of SKF and may not be reproduced (even extracts) unless permission is expressly granted. Notwithstanding any approval (which must be made in writing in order to be valid) from SKF to disclose the content of this Report (or parts hereof), any use of this Report or the contents thereof is the responsibility of the authorised user and SKF do not accept or assume any liability for any loss or damage whether direct, incidental or consequential arising out of the use of the information contained herein. Receipt of this Report, by any third party following approval, shall be considered as an agreement of non-disclosure of SKF proprietary information. In case this Report has been received by a third party without the express approval by SKF, such third party should promptly notify SKF thereof and return or destroy all copies of the Report as soon as possible. "
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+33 2 47403000 Report reference MDYYTxxx revx.x SKF internal use only 3/9 Table of content 1 Introduction .................................................................................................................. 5 2 Product overview ......................................................................................................... 5 3 Mechanical assembly update ..................................................................................... 5 4 Battery replacement .................................................................................................... 6 4.1 4.2 RENATA Battery ........................................................................................................................... 6 PANASONIC Battery ..................................................................................................................... 7 5 Antenna Gain ................................................................................................................ 8 6 Suggested tests update .............................................................................................. 9 Report reference MDYYTxxx revx.x SKF internal use only 4/9 1 Introduction Trax sensor (WEM-200) has been validated in 2019 at 7layers, Series production are planned for this summer 2021. During this industrialization phase we need to optimize some dimensions, to ensure better mechanical assembly, and change the battery reference for the former one is obsolete. This request is also valid for pilot parts that have the same changes except for the algorithm. none of the RF functions has been changed, as well s the PCB assembly. 2 Product overview Tolerances updated Tolerances updated Battery updated 3 Mechanical assembly update New New New New design Old design Report reference MDYYTxxx revx.x SKF internal use only 5/9 New design Old design New design Old design 4 Battery replacement 4.1 RENATA Battery The current battery is RENATA CR2450HTRH-LF:
3V, 490mAh Operational temperature -40_125C Weight 6.3g Report reference MDYYTxxx revx.x SKF internal use only 6/9 4.2 PANASONIC Battery The new battery is PANASONIC CR2540A/GBN 3V, 550mAh Operational T -40C_125C Weight 6.7g The impact of the battery replacement is on the product lifetime as shown in the table above the battery lifetime evolves from 7.28 years to 8.2 years and this is the only impact on the whole product. Renata battery Obsolete New battery Panasonic validated Report reference MDYYTxxx revx.x SKF internal use only 7/9 5 Antenna Gain The gain of the antenna on the whole product has been measured for comparison between the old and the new design. Antenna Gain whole product 2,2 2,4 2,6 2,8 3 New design whole product#60 first design whole product #12 frequency in GHz Antenna Gain whole product 2,35 2,4 2,45 2,5 2,55 2,6 New design whole product #60 First design whole product #12 Frequency in GHz 0 2
-5 i b d n i i n a G
-10
-15
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-25 2,3 0
-5 i b d n i i n a G
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-25 Conclusion The measurement of the antenna gain on old and new design are similar within the band 2.4Ghz and 2.485Ghz. No difference seen so far due to mechanical changes Report reference MDYYTxxx revx.x SKF internal use only 8/9 6 Suggested tests update According to the modifications only radiated performances could be modified frequency resonance shift on the antenna due to gap modification between antenna and plastic case antenna gain due to battery change (RF coupling) and to gap modification between antenna and plastic case for these reasons we suggest redoing all radiated tests done on report MDF_SKF_1903_FCC01 as follow Transmitter spurious radiated emission (FCC part 15 Subpart C according to ANSI C63.10) Band Edge Radiated (FCC part 15 Subpart C according to ANSI C63.10) Document reference MDYYTxxx revx.x SKF Internal use only 9/9