BRUEL & KJAER 4409 Скачать руководство пользователя | Manualshive

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Содержание 4409

Страница 1: ...9 The test unit and recordings have been desig ned to aid the accurate investigations of the frequency response of sound reproducing equipment i e record Iayersl tape film recorders etc BRUEL KJ N H N...

Страница 2: ...Response Test Unit Type 4409 Test Records Types OR 2007 09 FEBRUARY 1964...

Страница 3: ...ractical Hints for Use of the Test Records 17 Automatic Frequency Response Plotting 17 Automatic Gliding Frequency Cross Talk Measurements 19 General 19 Operating Procedure 20 Synchronous Filtering Ad...

Страница 4: ...ereopilOnic record player The 4409 fulfils three different functions a channel selection in the case of stereophonic equipment either manually when only one channel is inves tigated or automatically a...

Страница 5: ...e The total duration of one plot is 35 sec between the instant when the pick up is put down on the record QR 2007 and the instant when the set up is ready to start a new plot continuous frequency swee...

Страница 6: ...the QR 2007 Fig 1 4 and the photograpb of a section of the record illuminated by a grazing light beam Fig 1 5 show the exact composition of the recordings The QR 2008 and QR 2009 are described in the...

Страница 7: ...the 1 kc s signal preceeding each band Recording Characteristic lEe Standard No 3 without treble emphasis constant velocity above 1 kcfs Recorded Velocity at 1 kc s 3 16 em s r m s Bands 1 to 10 late...

Страница 8: ...on 5 Logarithmic Frequency Sweeps 10 cIs 100 cIs in 161 J sec Start Marking 10 cIs point cessation of the 1 kcls signal Recorded lever t li d 0 OO113 em peak Sand 1 45 left A Sand 3 lateral A B Sand 2...

Страница 9: ...d No 3 without treble emphasis constant velocity above 1 kc s Recorded Velocily t 1 kc s 2 24 em s r rn s in 45 modulation 3 16 em s in lateral and vertical modulations Bands 1 and 5 45 left modulatio...

Страница 10: ...tip radius being normalized to 15 18 fl for stereophonic pick ups this sets a db IIIII I I I II HttIT 1111 1 0 g Recording Characteristic 0 Gliding Frequency Records ClR 2007 ClR 2009 IIIIIII I I I I...

Страница 11: ...the optimum signal to noise ratio by increasing the recorded amplitude at low fre quencies where the rumbles and vibrations of the turntable are important and the recorded velocity at high frequencies...

Страница 12: ...al method of the Filtered B line light pattern referred to in the American Standards Over the whole frequency range the accuracy is checked by means of a professional electro dynamic pick up especiall...

Страница 13: ...10000 20000 62332 Fig 1 12 Curves showing tIze manufacturing tolerances Wllicil include both the record itself and tlIe equalizing filter characteristics The accuracy is best for lateral modulation an...

Страница 14: ...to the filter section The synchro starter is fully automatic The unit is transistorized and the power supply is taken from the 24 Volt DC circuit of the Level Recorder Type 2305 via the multi pin plu...

Страница 15: ...r section is short circuited as needed when testing sound reproducers other than record players e g tape recorders The filters are of the RC type and are designed to be used as external filters on the...

Страница 16: ...ed by the synchro starter whose block diagram is sketched in Fig 1 17 Type 2305 Type H09 Filter input Fig 1 17 Block diagram of the automatic start stop arrangement Synchro starter of 4409 clutch circ...

Страница 17: ...4409 to the 2305 the relay 03 then short circuits the single chart push button which otherwise should have been lifted up to obtain the automatic stop The paper drive stops as soon as the automatic st...

Страница 18: ...Turn table When reproducing heads are to be tested separately a good professional turn table should be selected especially with regards to investigations at low frequencies where the influence of wow...

Страница 19: ...nt in order to ensure that the correct automatic stop position is a ttained to play a record band before actual measurements are taken In addition it wil be possible during this preparatory playing to...

Страница 20: ...igations The only modification to be made in this case is that the POTENTIOMETER RANGE knob of the Level Recorder has to be shifted from 50 to 25 or 10 respectively Play back Losses At high frequencie...

Страница 21: ...is greater than 0 1 V at 1 kc s with a 10 kQ load the preamplifier may be omitted The spectrometer Type 2112 is equivalent to the combination 2603 1612 The combined unit Type 3313 2305 integral with 2...

Страница 22: ...ith a 20 cis filter first filter is the 25 cis filter 20 30 OR 2009 y 113 octave background noise ui 40 Pc E 0 L A E u 50 M oj L CD 0 60 without 20 200 2000 20000 cis 6t e Fig 2 3 Third octave analysi...

Страница 23: ...fre quency it is necessary that the automatic stop position be situated at an equal distance between two filter switching points The frequency sweep on the record starts from this position at the fre...

Страница 24: ...anual is in its upper position With the fingers turn Drive Shaft I in a counter clockwise direction unlil the Spectrometer switching device is heard to click Vith a pencil make a mark on the chain whe...

Страница 25: ...clockwise direction to a position approximately 9 0 further than the switching position noted in item 4 Fig 2 7 Photo illustrating how the PAPER SPEED knob is set to an inter mediate position Chain W...

Страница 26: ...ent of the filtering is necessary The Filter Switch of the Spectrometer should be shifted to a 1 3 octave filler position 5 steps higher than that corresponding 10 the test signal and the automatic st...

Страница 27: ...000000000 0000000000000000 0 000 1 0 1t 1I 1 OR 2009 band IiC vertlcgl mgt ion QP 0223 10 dB 20 100 left Right 1000 10000 Fig 2 10 Complete fOllr chart plot corresponding to the four directions of mod...

Страница 28: ...tained with the two channel selector of the Unit Type 4409 The tested pick up and the set up are the same as in the case of Fig 2 5 After this first chart the set up continues tile plotting of the thr...

Страница 29: ...continuous frequency sweep should be used for detecting all the peaks with certainty This can be obtained from the use of the Gliding Fre quency Record Type QR 2009 providing a logarithmic sweep 20 ci...

Страница 30: ...sing the B K Beat Frequency Oscillator Type 1022 as a constant reference input see Fig 2 13 The frequency tuning of this oscillator is logarithmic continuously covering the range 20 c s 20 kc s and ma...

Страница 31: ...band and F is the applied force in dynes dynes are obtained by multiplying grams by 981 The following are the exact values of the recorded amplitude which differ slightly from the nominal values and...

Страница 32: ...that the 1 kc s start signal is free from flaws or wow which might be able to actua te the 4409 too early Using high fidelity tape and a short start signal eliminates this risk An example of the freq...

Страница 33: ...ecorder Type 3308 consisting of a Beat Frequency Oscillator Type 1022 and Level Recorder Type 2305 The paper drive of the 2305 is m eciianically coupled and synchronized to the 20 C S 20 kc s logarith...

Страница 34: ...corded Surface Program Diameter of the QR 2007 Bands Less than 0 005 mm 0 0002 900 100 Should be comprised between 12 and 26 fA included angle 400 to 500 45 r ev min Outer diameter 292 mm 11 1 2 Inner...

Страница 35: ...4409 is not desired the Gear Lever X of the 2305 should be pushed in and the stop start switch should be in stop posi tion A 1000 cis signal sent to the 4409 will then start the recorder and the stop...

Страница 36: ...us Power Supply Dimensions of Metal Case Weight Accessories included Positjon Lin 170 k Q Position IEC 2 170 k Q 300 pF Position IEC 3 170 k Q 440 pF Position Lin 1 7 kQ 17 kQllo 2 uF Positions IEC 2...

Страница 37: ...al values Section 1 Section 2 Section 3 and 4 0 5 dB cross Ialk 20 dB 0 5 dB cross talk 40 dB 0 5 dB Section 5 0 5 dB on level at 100 cis 0 5 dB on line arity Section 6 1 dB Hesponse Test Unit Type 44...

Страница 38: ...I B K Printed in Copenhagen Denmark February 1964...

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