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?2011 knowles electronics 8x15x1.5 hac receiver o rder no. 2403 - 263 - 0009 2
knowles electronic s ? knowles . 201 1 all rights reserved. page 2 of 25 specification: 8x15x1.5 hac r eceiver order no. 2403 263 00092 revision: a1.5 .1 / 04. 29 . 1 1 change history status version date ecr comment / changes initials of owner draft a 1 .0 0 9 . 30 . 10 draft specification for first samples paul. song draft a1.1 10.20.10 updated chapte r 2.1. paul. song draft a1.2 11.05.10 updated the mechanical drawing of receiver [1.1] . updated the part marking/labelling[1.3]. updated the mass, material of basket and cover [1.4] . updated the test results on baffle [2.1] . updated the test results on bk 3.2 high leak [2.2] . updated the mechanical drawing of baffle adapter [2.6] . updated environmental tests [4] . paul. song draft a1.3 11.23.10 added recommend pad areas[1.1]. added the limit for spring force[1.2]. updated the part marking/labelling[1.3]. ad ded forces on component[1.4]. updated the material of cover [1. 5 ]. changed the limit of baffle test [ 2.1 ]. added maximum diaphragm excursion above the top of the surface[2.3]. added linear displacement volume[2.3]. added maximum displacement volume[2.3]. re moved maximum usable excursion xmax[2.3]. added measure setup[2.8.1]. updated environmental tests[4]. paul. song draft a1.3.1 01.21.11 removed linear displacement volume[2.3]. removed maximum displacement volume[2.3]. add weighting detail[2.4.1]. paul. s ong release a 1.4 03.11.1 1 updated the test results on baffle[2.1]. updated the test results on bk 3.2 high leak[2.2]. updated the characteristic field strength sensitivity and frequency response[ 2.5 ]. updated test sweep range, steps and add microphone details[2.8]. updated the schematic diagram measurement setup for hearing aid[2.9]. updated the packing information[2.10]. paul. song release a 1.4 .1 03. 22 . 11 updated the main dimensions [1.1]. paul. song release a 1.5 04.07.11 updated the material of b asket [1.5]. updated the material of pot/ topplate [1.5]. paul. song release a 1.5.1 04.29.11 add tolerance to nominal characteristic sensitivity [2.3] paul. song
knowles electronic s ? knowles . 201 1 all rights reserved. page 3 of 25 specification: 8x15x1.5 hac r eceiver order no. 2403 263 00092 revision: a1.5 .1 / 04. 29 . 1 1 contents 1. mechanical characteristics ................................ ................................ ................................ . 4 1.1. main dimensions ................................ ................................ ................................ ......... 4 1.2. spring force ................................ ................................ ................................ ................ 5 1.3. part marking/labeling ................................ ................................ ................................ .. 5 1.4. forces on component ................................ ................................ ................................ . 6 1.5. material lis t ................................ ................................ ................................ ................. 6 2. electro - acoustic characteristics ................................ ................................ ......................... 7 2.1. frequency response ................................ ................................ ................................ .... 7 2.2. frequency response ................................ ................................ ................................ .... 8 2.3. electro - acoustic parameters ................................ ................................ ....................... 9 2.4. power handling ................................ ................................ ................................ ........... 9 2.5. magnetic field for hearing aid characteristics ................................ ............................ 10 2.6. measurement setup on baffle ................................ ................................ .................... 11 2.7. measureme nt setup on bk 3.2 high leak ................................ ................................ ... 13 2.8. measured parameters ................................ ................................ ............................... 15 2.9. measurement setup for hearing aid ................................ ................................ .......... 15 2.10. packing information ................................ ................................ ................................ 16 2.11. technical delivery terms ................................ ................................ ....................... 16 3. e nvironmental conditions ................................ ................................ ................................ . 17 3.1. storage ................................ ................................ ................................ ...................... 17 3.2. transportation ................................ ................................ ................................ ........... 17 3.3. functionality ................................ ................................ ................................ .............. 17 4. e nvironmental tests ................................ ................................ ................................ ......... 18 4.1. qualification tests ................................ ................................ ................................ ..... 18 4.2. requ alification tests ................................ ................................ ................................ . 18 4.3. sample size, sequence ................................ ................................ ............................ 18 4.4. period of shelf - life ................................ ................................ ................................ .... 18 4.5. testing procedures ................................ ................................ ................................ .... 18 5. related documents ................................ ................................ ................................ .......... 25
knowles electronic s ? knowles . 201 1 all rights reserved. page 4 of 25 specification: 8x15x1.5 hac r eceiver order no. 2403 263 00092 revision: a1.5 .1 / 04. 29 . 1 1 1. mechanical characteristics 1.1. main dimensions recommend pad layout positive voltage on pin + moves membrane in direction of red arrow!
knowles electronic s ? knowles . 201 1 all rights reserved. page 5 of 25 specification: 8x15x1.5 hac r eceiver order no. 2403 263 00092 revision: a1.5 .1 / 04. 29 . 1 1 1.2. spring force 1.3. part marking/labeling 0 0.2 0.4 0.6 0.8 1 0 0.2 0.4 0.6 0.8 force (n) height (mm) (numbers are generic example)
knowles electronic s ? knowles . 201 1 all rights reserved. page 6 of 25 specification: 8x15x1.5 hac r eceiver order no. 2403 263 00092 revision: a1.5 .1 / 04. 29 . 1 1 1.4. forces on component state maximum permanent force[n] maximum handling force[n] from back to front(cover) 10 15 membrane 0 0 from side to side 5 10 1.5. material list 1. m aterial of basket: pc 2. material of membrane: polyarylate - compound 3. material of pot/ topplate: soft magnetic iron , ni plating 4. material of magnet: nd fe b 5. material of spring contact: stainless steel 6. plating of spring contact: 2.5 - 3.5 ? m ni, 0. 5 - 0. 7 ? m au (contact point) 7. material of cover: brass cuzn , ni plating 8. dimension: 8 x 15 x 1. 5 mm 9. mass: 0. 5 5 4 g 10. connections: spring contact 11. direction of connector: vertical to pcb (orientated)
knowles electronic s ? knowles . 201 1 all rights reserved. page 7 of 25 specification: 8x15x1.5 hac r eceiver order no. 2403 263 00092 revision: a1.5 .1 / 04. 29 . 1 1 2. electro - acoustic characteristics 2.1. frequency response typical fr equency response measured on baffle according to chapter 2.6 (d=1cm; p=10mw @32 ? ) tolerance window f [hz] lower limit [db re1khz ] f [hz] upper limit [db re1khz ] 160 - 14 160 0 350 - 3 270 4 450 - 3 450 4 999 - 3 999 3 1000 0 1000 0 1001 - 3 1001 3 2000 - 3 2000 3 4000 - 1 4000 6 6500 4 6500 14 7000 - 16 10000 14 10000 - 16 - 20 - 15 - 10 - 5 0 5 10 15 20 100 1000 10000 relative level (db re 1khz) frequency[hz] low limit up limit typical spl curve
knowles electronic s ? knowles . 201 1 all rights reserved. page 8 of 25 specification: 8x15x1.5 hac r eceiver order no. 2403 263 00092 revision: a1.5 .1 / 04. 29 . 1 1 2.2. frequency response typical frequency re sponse measured on bk 3.2 high leak according to chapter 2. 7 (p=10mw @32 ? , erp ) tolerance window f [hz] lower limit [db re1khz ] upper limit [db re1khz ] f [hz] upper limit [%] 200 - 12 - 2 200 70 250 - 7.3 2.5 300 45 350 - 2.5 2.5 500 14 999 - 2.5 2.5 600 8 1000 0 0 700 8 1001 - 2.5 2.5 800 10 1250 - 0.5 5.5 1000 4 1500 4.5 12.5 1250 3 1600 5.5 13 6000 3 1700 3.5 12.5 2000 - 4.5 6.5 2500 - 11.5 - 2.5 3000 - 14 - 7 4000 - 14 - 7 0 20 40 60 80 100 120 100 1000 10000 - 40 - 30 - 20 - 10 0 10 20 thd (%) relative level (db re 1 khz) frequency (hz) spl up limit spl low limit typical spl curve typical thd curve thd limit
knowles electronic s ? knowles . 201 1 all rights reserved. page 9 of 25 specification: 8x15x1.5 hac r eceiver order no. 2403 263 00092 revision: a1.5 .1 / 04. 29 . 1 1 2.3. electro - acoustic parameters receiver mounted in baffle acc. to chapter 2.6 and 3.2 high leak ear acc. to chapter 2.7 1. rated impedance z: 32 ? 2. voice coil resistance r: 2 8. 8 ? 2.88 ? 3. resonance frequency f 0 : 3 00 hz 45hz 4. maximum diaphragm excursion above the top of the surface: 0.2mm 5. nominal characteristic sensitivity( @3.2 high leak ; 1khz, 10mw) 25.5 2. 5 dbpa/ v 6 . nominal characteristic sensitivity 89 dbpa re 20upa ( @baffle, 10mw, 1cm ; average from 1khz to 3khz ) 7 . thd according to chapter 2. 2 2.4. power handling receiver mounted in lifetime test device (open rear/open front) . 1. rated noise power 1 0m w (rms) ( 500h, pin k noise with the weighting , crest factor is 12db ) type order f0[hz] high pass 1 250 high pass 10 100 low pass 10 3500 2. overload power 30 m w (rms) ( 50h, sinusoidal, 200hz~6 khz , allow increase r& b ) 3 . rated sinusoidal power 10 m w (rms) ( 50h, sinusoidal, 200hz~6 khz , no damage )
knowles electronic s ? knowles . 201 1 all rights reserved. page 10 of 25 specification: 8x15x1.5 hac r eceiver order no. 2403 263 00092 revision: a1.5 .1 / 04. 29 . 1 1 2.5. magnetic field for hearing aid characteristics receiver mounted in measurement setup acc . to chapter 2. 9 1. charact. fiel d strength sensitivity at 566 mv ( 1 0 mw) 1khz, measurement plane15mm axial : 12.13 db a/m per v radial ( average of 4 position): 4.50 db a/m per v 2. frequency response (axial relative to value at 1khz ) - 8 - 6 - 4 - 2 0 2 4 100 1000 10000 level [db re 1khz] frequency [hz] magnet field strength frequency response typical curve low limit up limit
knowles electronic s ? knowles . 201 1 all rights reserved. page 11 of 25 specification: 8x15x1.5 hac r eceiver order no. 2403 263 00092 revision: a1.5 .1 / 04. 29 . 1 1 2.6. measurement setup on baffle 2.6.1. measured setup d=1.0cm.
knowles electronic s ? knowles . 201 1 all rights reserved. page 12 of 25 specification: 8x15x1.5 hac r eceiver order no. 2403 263 00092 revision: a1.5 .1 / 04. 29 . 1 1 2.6.2. measured adapter
knowles electronic s ? knowles . 201 1 all rights reserved. page 13 of 25 specification: 8x15x1.5 hac r eceiver order no. 2403 263 00092 revision: a1.5 .1 / 04. 29 . 1 1 2.7. measurement setup on bk 3.2 high leak 2.7.1. measured setup
knowles electronic s ? knowles . 201 1 all rights reserved. page 14 of 25 specification: 8x15x1.5 hac r eceiver order no. 2403 263 00092 revision: a1.5 .1 / 04. 29 . 1 1 2.7.2. measured adapter
knowles electronic s ? knowles . 201 1 all rights reserved. page 15 of 25 specification: 8x15x1.5 hac r eceiver order no. 2403 263 00092 revision: a1.5 .1 / 04. 29 . 1 1 2.8. measured parameters 1.measure setup for the test on baffle, the test signal is cosine log sweep signal, from 1 0khz to 100 hz, 160 steps , used bk 4939 1/4 free field microphone, sn is 2624669 . for the test on bk3.2 high leak, the test signal is cosine log sweep signal, from 10khz to 100 hz, 16 0 steps , used bk 4195 ear simulator, sn is 2538591 . 2 . sensitivity sensitivity is expressed in db rel 1v/1pa measured at input voltage of 0.566v using the measurement setup according chapter 2. 7 . 3 . frequency response frequency response on baffle is measured according to the test setup in chapter 2. 6 at input voltage of 0.566v and checked against the tolerance window defined in chapter 2.1. frequency response on bk3.2 high leak is measured according to the test setup in chapter 2. 7 at input voltage of 0.566v and checked against the tolerance window defined in chapter 2.2. 4 . total harmonic distortio n (thd) is measured according to iec 268 - 5 (2nd to 5th harmonics) and the test setup in chapter 2. 7 at input voltage of 0.566v and checked against the tolerance window defined in chapter 2.2. 2.9. measurement setup for hearing aid tests are conducted at z (axial) direction, y and x (radial) directions m easurement p ositions acc. t o ansi c63.19[4]
knowles electronic s ? knowles . 201 1 all rights reserved. page 16 of 25 specification: 8x15x1.5 hac r eceiver order no. 2403 263 00092 revision: a1.5 .1 / 04. 29 . 1 1 * receiver must be mount ed on a plastic surface magnetic ambient levels be low as to not significantly affect the measurement, magnetic shielded chamber would be better. 2.10. packing information see document: packaging instruction for 8x15x1.5 hac receiver 2403 - 263 - 00092 - 299 . 2.11. technical delivery terms see chapter 4 .
knowles electronic s ? knowles . 201 1 all rights reserved. page 17 of 25 specification: 8x15x1.5 hac r eceiver order no. 2403 263 00092 revision: a1.5 .1 / 04. 29 . 1 1 3. e nvironmental conditions 3.1. storage the transducer fulfils the specified data after treatment according to the conditions of ets 300 019 - 2 - 1 specification of environmental test: storage test spec. t 1.2: weather protected, not temperature controlled storage locations. 3.2. transportation the transducer fulfils the specified data after treatment according to the conditions of ets 300 019 - 2 - 2 specification of environmental test: transportation test spec. t 2.3: public transportation 3.3. functionalit y the transducer fulfils the specified data after treatment according to the conditions of ets 300 019 - 2 - 5 specification of environmental test: ground vehicle installations test spec. t 5.1: protected installation ets 300 019 - 2 - 7 specification of environ mental test: portable and non - stationary use test spec. t 7.3e: partly weather protected and non - weather protected locations.
knowles electronic s ? knowles . 201 1 all rights reserved. page 18 of 25 specification: 8x15x1.5 hac r eceiver order no. 2403 263 00092 revision: a1.5 .1 / 04. 29 . 1 1 4. e nvironmental tests 4.1. qualification tests according to our milestone plan (product creation process), a complete qualifi cation test will be done at design validation on products, manufactured under serial conditions and 1x per year and product family. the qualification process covers all tests described under 4.5 and a complete inspection takes place. 4.2. requalification tests 1x per month and product family samples are taken and submitted to tests described under 4.5.2 4.3. sample size, sequence unless otherwise stated 20 arbitrary new samples will be used to perform each test for both, qualification and requalification test as described under 4.1 and 4.2. 4.4. period of shelf - life the period of shelf - life is 5 years . 4.5. testing procedures 4.5.1. storage tests low temperature storage test parameter test method and conditions duration evaluation standard low temperature storage (ref. bsi bs en - 60068 - 2 - 1 ) - 40c rel. humidity not controlled 168h measurements of acoustic parameters shall be still within specification. allowed deviations: sensitivity is allowed to be within +/ - 3db from initial value; the distortion shall not increase by more than a factor of 1.4 of the initial value measured at a single frequency bin.
knowles electronic s ? knowles . 201 1 all rights reserved. page 19 of 25 specification: 8x15x1.5 hac r eceiver order no. 2403 263 00092 revision: a1.5 .1 / 04. 29 . 1 1 e.g.: distortion at frequency bin 400hz which is initially 10% is allowed to be 14% after the test. high temperature storage test parameter test method and conditions duration evaluation standard dry heat storage (ref. bsi bs en - 60068 - 2 - 2 ) +85c rel. humidity not controlled 168h measurements of acoustic parameters shall be still within specification. allowed deviations: sensitivity is allowed to be within +/ - 3db from initial value; the distortion shall not increase by more than a factor of 1.4 of the initial value measured at a single frequency bin. e.g.: distortion at frequency bin 400hz which is initially 10% is allowed to be 14% after the test. thermal shock sequence p arameter test method and conditions duration evaluation standard change of temperature (ref. iec 60068 - 2 - 14) - 40c for 30min and then move to +85c for 30min; transition time < 3 min; 20 cycles (40 shocks); 20 cycles measurements of acoustic parameters s hall be still within specification. allowed deviations: sensitivity is allowed to be within +/ - 3db from initial value; the distortion shall not increase by more than a factor of 1.4 of the initial value measured at a single frequency bin. e.g.: distortion at frequency bin 400hz which is initially 10% is allowed to be 14% after the test.
knowles electronic s ? knowles . 201 1 all rights reserved. page 20 of 25 specification: 8x15x1.5 hac r eceiver order no. 2403 263 00092 revision: a1.5 .1 / 04. 29 . 1 1 humidity stress test parameter test method and conditions duration evaluation standard damp heat, cyclic (ref. i ref. iec 60068 - 2 - 3 ) 85c and 95% rh; 168hrs measu rements of acoustic parameters shall be still within specification. allowed deviations: sensitivity is allowed to be within +/ - 3db from initial value; the distortion shall not increase by more than a factor of 1.4 of the initial value measured at a single frequency bin. e.g.: distortion at frequency bin 400hz which is initially 10% is allowed to be 14% after the test. 4.5.2. operating tests cold operation test parameter test method and conditions duration evaluation standard cold operation test (ref. bsi bs en - 60068 - 2 - 2, signal used to be agreed upon with rim ) - 20c rel. humidity not controlled 72h measurements of acoustic parameters shall be still within specification. allowed deviations: sensitivity is allowed to be within +/ - 3db from initial value; the distortion shall not increase by more than a factor of 1.4 of the initial value measured at a single frequency bin. e.g.: distortion at frequency bin 400hz which is initially 10% is allowed to be 14% after the test.
knowles electronic s ? knowles . 201 1 all rights reserved. page 21 of 25 specification: 8x15x1.5 hac r eceiver order no. 2403 263 00092 revision: a1.5 .1 / 04. 29 . 1 1 dry heat operation test parameter test method and conditions duration evaluation standard dry heat operation (ref. bsi bs en - 60068 - 2 - 1 signal used to be agreed upon with rim ) +70c rel. humidity not controlled 500h measurements of acoustic parameters shall be still within specificati on. allowed deviations: sensitivity is allowed to be within +/ - 3db from initial value; the distortion shall not increase by more than a factor of 1.4 of the initial value measured at a single frequency bin. e.g.: distortion at frequency bin 400hz which is initially 10% is allowed to be 14% after the test. 4.5.3. salt mist test parameter test method and conditions duration evaluation standard salt mist ( ref. iec 60068 - 2 - 52) the part must be subjected to 2 hours spray of 5% nacl salt mist, at 35c then be left at 40c and 95% rh for 22 hrs. 3 cycles measurements of acoustic parameters shall be still within specification. allowed deviations: sensitivity is allowed to be within +/ - 3db from initial value; the distortion shall not increase by more than a factor of 1.4 of the initial value measured at a single frequency bin. e.g.: distortion at frequency bin 400hz which is initially 10% is allowed to be 14% after the test. 4.5.4. shock resistance test (free fall test) - protected product parameter test method and condi tions duration evaluation standard mechanical shock ( ref. iec 60068 - drop in test box or test adapter; dropped onto 40 drops measurements of acoustic parameters shall be still
knowles electronic s ? knowles . 201 1 all rights reserved. page 22 of 25 specification: 8x15x1.5 hac r eceiver order no. 2403 263 00092 revision: a1.5 .1 / 04. 29 . 1 1 2 - 32) concrete from 1.5m height; two drops on each side (2x6); one drop on each edge (1x12); two drops on each corner (2x8); in total of 40 drops within specification. allowed deviations: sensitivity is allowed to be within +/ - 3db from initial value; the distortion shall not increase by more than a factor of 1.4 of the initial val ue measured at a single frequency bin. e.g.: distortion at frequency bin 400hz which is initially 10% is allowed to be 14% after the test t here shall be no loose particles dissipated from the components during the test 4.5.5. impact durability test (tumble tes t) C protected product parameter test method and conditions duration evaluation standard impact durability (in a tumble tester) (ref. iec60068 - 2 - 32ed) impact durability (in a tumble tester) dut in drop test adapter/jig 170grams; jig size: 120mm*60mm*18 mm; 100drops, 1m random drops on steel base. 100 drops, 1m dut power off measurements of acoustic parameters shall be still within specification. allowed deviations: sensitivity is allowed to be within +/ - 3db from initial value; the distortion shall not increase by more than a factor of 1.4 of the initial value measured at a single frequency bin. e.g.: distortion at frequency bin 400hz which is initially 10% is allowed to be 14% after the test t here shall be no loose particles dissipated from the compon ents during the test 4.5.6. g - force test parameter test method and conditions duration evaluation standard g - force test test adapter / measurements of acoustic
knowles electronic s ? knowles . 201 1 all rights reserved. page 23 of 25 specification: 8x15x1.5 hac r eceiver order no. 2403 263 00092 revision: a1.5 .1 / 04. 29 . 1 1 170grams; jig size: 120mm*60mm*18mm; 5000g, 0.2msec; parameters shall be still within specificati on. allowed deviations: sensitivity is allowed to be within +/ - 3db from initial value; the distortion shall not increase by more than a factor of 1.4 of the initial value measured at a single frequency bin. e.g.: distortion at frequency bin 400hz which is initially 10% is allowed to be 14% after the test there shall be no loose particles dissipated from the components during the test 4.5.7. resistance to electrostatic discharge parameter test method and conditions duration evaluation standard resistance to es d iec61000 - 4 - 2 level 4 (spr c 2.5.1) one pole is grounded and.the esd pulse is applied to the other pole. the speaker must be stressed first with one polarisation and then with the other polarisation.dut must be discharged between each esd exposure. level 4: contact +/ - 8kv, air +/ - 15kv 10 exposures on each polarity / 5 units dut power off measurements of acoustic parameters shall be still within specification. allowed deviations: sensitivity is allowed to be within +/ - 3db from initial value; the distortio n shall not increase by more than a factor of 1.4 of the initial value measured at a single frequency bin. e.g.: distortion at frequency bin 400hz which is initially 10% is allowed to be 14% after the test. 4.5.8. sine vibration test parameter test method and conditions duration evaluation standard sine vibration test (ref. iec 60068 - 2 - 6) 10 C 150 hz, 50 m/sec 2 acceleration; 90 minute in each axis; 270 minutes (3 axes) 270minutes measurements of acoustic parameters shall be still within specification. allowed deviations:
knowles electronic s ? knowles . 201 1 all rights reserved. page 24 of 25 specification: 8x15x1.5 hac r eceiver order no. 2403 263 00092 revision: a1.5 .1 / 04. 29 . 1 1 in total; sensitivity is allowed to be within +/ - 3db from initial value; the distortion shall not increase by more than a factor of 1.4 of the initial value measured at a single frequency bin. e.g.: distortion at frequency bin 400hz which is in itially 10% is allowed to be 14% after the test . there shall be no loose particles dissipated from the components during the test 4.5.9. random vibration test parameter test method and conditions duration evaluation standard random vibration test ref. iec 600 68 - 2 - 64 5 C 500 hz, 0.01g 2 /hz; 100 minutes at each axis, total 300 minutes (3 axes) 300minutes measurements of acoustic parameters shall be still within specification. allowed deviations: sensitivity is allowed to be within +/ - 3db from initial value; the distortion shall not increase by more than a factor of 1.4 of the initial value measured at a single frequency bin. e.g.: distortion at frequency bin 400hz which is initially 10% is allowed to be 14% after the test. there shall be no loose particles diss ipated from the components during the test . 4.5.10. mechanical shock parameter test method and conditions duration evaluation standard mechanical shock test ref. iec 60068 - 2 - 27 peak acceleration 30g, 18 ms duration, 3.4m/s (half - sine); six successive shocks s hall be applied in each 18 shocks measurements of acoustic parameters shall be still within specification. allowed deviations: sensitivity is allowed to be within +/ - 3db from initial v alue;
knowles electronic s ? knowles . 201 1 all rights reserved. page 25 of 25 specification: 8x15x1.5 hac r eceiver order no. 2403 263 00092 revision: a1.5 .1 / 04. 29 . 1 1 direction of three mutually perpendicular axes; in total of 18 shocks the distortion shall not increase by more than a factor of 1.4 of the initial value measured at a single frequency bin. e.g.: distortion at frequency bin 400hz which is initially 10% is allowed to be 14% after the test t here shall be no loose partic les dissipated from the components during the test . 5. related documents en - 60068 - 2 environmental testing ipc - sm - 785 guidelines for accelerated reliability testing of surface mount solder attachment iec68 - 2 - 14 tempreture change testing guidline iec68 - 2 - 3,1984 humidity and tempreture test guidline iec60068 - 2 - 52 low air pressure environmentaltesting procedure iec60068 - 2 - 32 free fall test procedure iec61000 - 4 - 2 esd test guidline iec68 - 2 - 27 mechanical shock test guidline

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