BRUEL & KJAER 1612 Скачать руководство пользователя страница 71

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Страница 1: ...Octave Band Pass Filters 22 45ooo c s Selective Frequency Range Standardized Weighting Networks A B and C Transistor Coupled Output Stage 4 Automatic Remote Filter Switching _ BHUEL KJ H Ncerum Denmar...

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Страница 3: ...Band Pass FiIter Set Type 1612 Reprint june 1965...

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Страница 5: ...Contents Introduction 5 Description 8 Control Knobs and Terminals 24 Operation 26 Accessories and Combined Units 49 Applications 54 Specification 73...

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Страница 7: ...filter in a graph with a linear ordinate showing the ratio transmission at the particular frequencies to the maximum transmission and with an abscissa showing the relative f frequency f where fo equal...

Страница 8: ...vel from the filters would increase by exactly 10 dB decade 3 dB octave as the r m s voltage white noise is proportional to the square root of its effective bandwidth The deviation in the correction f...

Страница 9: ...d negative is plotted f versus relative frequency fo Example octave o 5 octave 6 6 reads _ _ 1 41 fo 5 _ _ octave o 17 octave 6 6 reads _ _ l o 0 89 4 6 i 8 t 05 _1_ fa 0 6 0 7 0 8 0 9 1 I 1t 2 l 3 v...

Страница 10: ...ters 16 Weighting Networks 18 A B and C 18 Low Frequency Cut off 19 Selection of Filters and Weighting Networks 20 Remote Control 20 Extension Filters 20 Output Stage 21 Ove all Performance of Band Pa...

Страница 11: ...proposed by I E C for Precision Sound Level Meters The fourth network gives a linear frequency response 20 45ooo Hz c s The filters and weighting networks can be selected successively by a 50 position...

Страница 12: ...ses the transistor stage to the output of the Filter Set The remote filter selection is provided by a built in electro mechanic device which can be controlled by an external contact in series with a d...

Страница 13: ...1160 160 37 6300 1450 200 46 8000 1830 250 58 10000 2300 315 73 12500 2900 400 92 16000 3700 500 116 20000 4600 630 145 25000 5800 800 183 31500 7300 40000 9200 A single filter consists of three reso...

Страница 14: ...will be a wave shaped curve varying between approximately 500 ohms and 2ooo ohms so that the impedance is high at the center frequencies and low at the band limits see also Fig 1 4 kSl 2 c c 1 5 l 10...

Страница 15: ...The frequency response of a filter is flat to within 1 h dB over approximately 1 4 octave At the band limits i e lk octave from the center frequency the attenuation is approximately 3 dB See Fig 1 5 H...

Страница 16: ...rger and heavier The filter curves will therefore not be of the same quality at these frequencies as there will be only top and the flat part is about lk octave wide The attenuation of these filters i...

Страница 17: ...ves for one apparatus are expected to lie 1 3 Octave Filter db c 0 10 15 20 270 180 goo lo c oo 0 goo 0 Ill c J 180 Q_ Frequency 1636 lf ig 1 7 Phase response of Filter set in 1 3 octave condition sho...

Страница 18: ...requeney Hz e s 31 5 63 125 250 500 1000 Maximum steep ness about 100dbfoctave 2 11j2 1 0 5 0 25 I Bandwidth at 3 dB Center Frequeney I Bandwidth at 3 dB 1j2 Hz e s Approx 22 45 89 177 353 707 db c 2...

Страница 19: ...ilter characteristics when Filter Set is in 1 1 octave condition db 10 c 0 20 30 630 540 360 180 lag 5 oo lead 0 180 0 s a 360 540 630 Octave Filter A 5 rff 1V fj f 31 5 kC s I v J s f h l f I f Fig 1...

Страница 20: ...Figs 1 8 and 1 9 The attenuation at 1 octave is approximately 35 dB being somewhat less for the filters at the lower frequencies Phase Response The phase response curves of the octave filters are sho...

Страница 21: ...B 38 5 24 4 14 2 7 4 3 0 o 9 o 1 0 0 2 0 8 3 0 6 0 11 1 dB Curve C 14 5 6 3 2 0 5 o 1 0 0 0 o 2 o 8 3 0 6 0 11 0 dB Tolerance Precision Sound 5 5 2 1 5 1 1 1 1 1 1 1 5 3 3dB Level Meters 8 5 2 1 5 1...

Страница 22: ...Filter Set flat from 20 to 45ooo Hz c s Remote Control The Filter Switch can be manually or automatically operated the latter being achieved by a remotely controlled electro magnetic drive unit To obt...

Страница 23: ...g by 10 k Q the amplitude vs frequency characteristic of the output stage slopes off at the low frequencies vide Fig 1 15 Output Stage Power Supply The power supply for the transistors is maintained v...

Страница 24: ...u CUI oo j 1 cue cn 2 OUI lUI E 8 10 UJI IIII II 2 6 8 II I 10 100 Frequency IIIII IIIIIIIIII II 1000 5 10000 2 IIIIIII II 100000 C S f62 9 Fig 1 15 Typical voltage transmission loss of Filter Set as...

Страница 25: ...nic distortion of complete Filter Set in 1 3 octave condition shown as a function of input peak voltage on FILTER INPUT Valid of 1oooHz cis and 100 k Q load on FILTER OUTPUT c Q2 6 0 1 u c 0 E 0 I 1 0...

Страница 26: ...The signal source imped ance should be lower than 10 D Transformer The signal from the FILTER INPUT is passing the input transformer The signal source impedance should be lower than 1ooo D Input Termi...

Страница 27: ...t REMOTE CONTROL Plug for connections of remote control circuits and external battery supply EXTENSION FILTER When the special ad aptor JP 0019 transforming the 7 pole socket into a 14 mm screened jac...

Страница 28: ...2603 or Type 2604 31 A F Spectrometer Analyses 31 Automatic Recording of Sound Spectrograms 32 A Set up Calibration and Adjustment of Equipmellit 32 B Employment of Different Potentiometers 39 C Eval...

Страница 29: ...terminals of the Random Noise Generator Type 1402 when the Band Pass Filter Set i s connected to the Generator s external filter terminals I Manual Noise Band Selection I Connect the Filter Set and No...

Страница 30: ...as possible to that of the load impedance and adjust to appropriate signal level by OUTPUT LEVEL potentiometer II Automatic Noise Band Selection The procedure described above is followed throughout T...

Страница 31: ...of frequency calibrated paper and mount pen or sapphire If neces sary see instrucHon manual for the Level Recorder 2 Set control knobs on Level Recorder POTENTIOMETER RANGE dB on Stand by POWER to On...

Страница 32: ...immediately stopped 7 Move paper by finger wheel Z Fig 3 3 until the pen points half way between two squares indicating the ih octave filter frequencies placed on the top of the recording chart To obt...

Страница 33: ...automatically see paragraph Automatic Recording of Sound Spectrograms or Automatic Recording of Voltage Analyses below The operation procedure is identical for both Amplifier Type 2603 and Type 2604...

Страница 34: ...METER SWITCH to R M S Average or Peak Fast or Slow as desired 4 Set RANGE MULTIPLIER to obtain suitable indicating meter deflec tion preferable between 10 and 20 dB on scale The signal level within th...

Страница 35: ...l of Microphone Amplifier III Calibration of Level Recorder 1 Potentiometer 50 dB employed For potentiometers with other ranges refer para B page 39 2 Set control knobs as follows POTENTIOMETER RANGE...

Страница 36: ...or less the paper automatically stops 5 Move the recording paper by means of the finger wheel Z Fig 3 3 until the pen points at the 10 Hz c s line V Synchronization between Level Recorder and Band Pas...

Страница 37: ...Mo ohlplyF Scolelo _1_ 0 010 QP 1123 10 100 1 1 1 b 1000 10000 1 19H Fig 9 6 Synchronization between recording paper and filter switching Concerning the overswing on the recording refer the footnote o...

Страница 38: ...To draw the line the stylus is given a de flection which may be obtained by pressing the knob 100 mV Ref on the Level Recorder Should the paper have to be shifted equal to a lower frequency the respec...

Страница 39: ...ponds to the red mark Example z K o 3 dB The pointer has to be adjusted to 16 dB o 3 dB 15 7 dB Microphone 4133 or 4134 employed 3 The control knobs of the Micro phone should be operated as follows IN...

Страница 40: ...obs RECTIFIER RESPONSE LOWER LIMITING FREQUENCY WRITING SPEED and PAPER SPEED on the Level RECORDER are set to positions whichever are desired for the measurements NOTE By choosing the positions of LO...

Страница 41: ...rt and Forward 4 INPUT ATTENUATOR is set to Range Potentiometer INPUT ATTENUATOR 10 dB 30 25 dB 75 dB 10 35mV 10 110 mV 30 0 50 40 5 By the Level Recorder INPUT POTENTIOMETER the deflection of the sty...

Страница 42: ...l curve A zz __ Lo o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o I bo Bril l r 5025 lto I6Kjllot 1 1 6 _ M I X lOl S Ojstgnce Scm 113 octave analysjs 20000 ch OOOOA 100 1000...

Страница 43: ...hone 4131 or 4132 employed 1 50 dB Range Potentiometer applied The value in dB on the spectro gram the number of dB S L in dicated by METER RANGE the sum of num ers of dR indicated by RANGE MUL TIPLIE...

Страница 44: ...CTOR Octave 10 dB 10 dB 80 dB 10 dB 10 dB 20 dB 70 dB S P L or S L Microphone 4133 or 4134 employed 2 10 dB Range Potentiometer applied The value in dB on the spectro gram the number of dB S L indi ca...

Страница 45: ...ION SELECTOR dB deflection stated for calibration of the Level Recorder 4 dB 20 dB 10 dB Example 50 dB Range Potentiometer The value in dB on the spectro gram the number of dB S L indi cated by METER...

Страница 46: ...Amplifier to METER RANGE and RANGE MULTIPLIER Are set so that a suitable deflection of the writing stylus is obtained 40 45 dB for 50 dB Range Potentiometer em ployed To give the highest signal noise...

Страница 47: ...numbers of dB indicated by METER RANGE RANGE MULTIPLIER and FUNCTION SELECTOR dB range of Potentiometer employed 10 25 or 50 dB re 10 V Example 50 dB Potentiometer Deflection of the stylus 46 dB METER...

Страница 48: ...by using this value z the re ading on the spectrogram is derived by the aid of the following table in which can be read the voltages that give zero deflection and full deflection respectively togethe...

Страница 49: ...lifie r for Zero or Full Stylus Deflection Reference Reading If it is required to record voltages in dB above or below a certain reference value the voltage equal to 0 db deflection or full deflection...

Страница 50: ...eflection on Recording Paper and FUNCTION SELECTOR Logarithmic Range Potentiometer 10 25 and 50 dB 100 pV tOO dB 316 90 1 mV 80 3 16 70 10 00 31 6 50 100 40 316 30 1 v 20 3 16 10 10 0 31 6 to 100 20 3...

Страница 51: ...he pass band are within those stated for the 1 3 octave filters in the Band Pass Filter Set Octave Filter When the Band Pass Filter Set is set to 1 1 octave analysis the 1 3 octave filters in the Exte...

Страница 52: ...adaptor in place when the Band Pass Filter Set is used as external filter for the B K Random Noise Generator Type 1402 Frequency Analyzer Type 2107 or Micro phone Amplifier Type 2603 or Type 2604 Thi...

Страница 53: ...is purpose the Connection Box is a very useful accessory The Box contains four screened sockets which are all connected in parallel in multipoles These terminals match the normal B K Screened Connecti...

Страница 54: ...qual to the Spectrometer Type 2112 If a broad band signal is to be analyzed it is thus possible to make coarse analys is 111 octave or 1 3 octave when using the instruments as a spectro meter When it...

Страница 55: ...ilter Set see also curve b Fig 4 5 It is also possible to drive automatically the frequency tuning of the Analyzer Type 2107 from an external motor By driving the tuning mechanism from the motor in th...

Страница 56: ...ion 58 Airborne Sound Insulation Measurements by Random Noise 59 Measurements of Impact Sound Transmission 61 Loudspeaker Frequency Response Measurements by Bands of Random Noise 63 Analysis by Precis...

Страница 57: ...rol Completing the equipment with a suitable B K sound or vibration transducer spectrograms of one or the other type can be carried out Microphale UA ID21 Microphone AmpUfier 1112 Band Pass Filter Set...

Страница 58: ...l ll l l lllllillll l lllllll l l llllllllll l lllllll llll1 a lathe db above 2x 10 u bar 1 10 o til IO 5 JD t s L 100 c Qp 0123 10 100 1000 10000 l l A b 6182 OOOD D DD DOO O OOO OD DDDDDOD O D D DD...

Страница 59: ...llllll l illlillilliill il lliliill ll l l illllill bfs o12 JLgocm db above Internal noise of equipment W afvf nal 1 _ t JOdb JQ _ Ll kft l Q_lec Noo _ 50 o 5 1 61 QP 0123 1 100 1000 10000 6195tJ Fig...

Страница 60: ...achine is analysed in 1 3 octaves Used as transducer is the B K Accelerometer Type 4308 the signal o f which is applied to the Vibra tion Pick up Preamplifier Type 1606 which further is connected to t...

Страница 61: ...of a motor foundation isolation has been measured as a function of frequency DDD D D D OOD O DO ODDDO D DD D DDDODD D D DODDDDODDDDDDD DD DDD 8rG IGtr l 0 25 a o Q _ ICI W Ki 1015 A C Motor jnsta I o...

Страница 62: ...r Type 2 305 With the combination Microphone Amplifier Band Pass Filter Set the signal from the Microphone can be measured in bands of 1 3 or 1 1 octaves The Level Recorder records the analysed signal...

Страница 63: ...a floor against impact sounds is estimated by placing a standardized impact sound generator on the floor and measuring the sound intensity L in the room below in various frequency bands In Fig 5 12 i...

Страница 64: ...ig 5 12 Equipment for measuring of floor impact sound insulation OOOODDDDOOOOOOOODDO OOOOODOOOOOOOODODODOOOOOOOOOOO lrO jGir SOIS _ Wa K r Mtla q 107S Iaplling Mgcbjne o 1 Q ac toiot 2 jn room 8 10db...

Страница 65: ...noise as test signal The signal applied to the loudspeaker is generated from the B K Random Noise Generator Type 1402 combined with the Band Pass Filter Set By using the Band Random Noise Generator B...

Страница 66: ...tion with the B K Precision Sound Level Meter Type 2203 sound or vibration analyses in 1 3 or 1 1 octave bands can be made manually or recording can be carried out auto matically by completing the ins...

Страница 67: ...0 62 sec 6363 i Fig 5 17 Measuring arrangement for recording reverberation time Pistol used as sound source When utilizing this method the receiving part of the equipment should always contain a sele...

Страница 68: ...Using a Frequency modulated Oscillator or Narrow Band Noise Generator A suitable measuring arrangement is shown in Fig 5 18 In this instance although not strictly necessary it is recommended to employ...

Страница 69: ...measurements are carried out 1612 2112 Frontal Connections 2305 1024 1022 Ground o o Ground a 1612 2305 2112 Lifting Magnet B1 84 A2 24 v Ground b Ground Fig 5 20 Connection between instruments a Con...

Страница 70: ...movement is synchronized with the frequency scanning of the Generator with the filter switching on the Spectrometer and with the instant of switching off the sound the starting points of the decay cur...

Страница 71: ...Wideband Random Noise Generator In this case bands of noise with constant percentage bandwidths are generat ed and it is recommended to use a selective receiver which ensures a large dynamic range Ho...

Страница 72: ...ency modulated signals as sound generator 1402 Generator Stop 1402 39012 b Filter Switch 1612 1612 2305 a External View A1 A1 2305 2305 2305 1612 or 2112 Filter Switch 1612or 2112 16 3639 Fig 5 24 a C...

Страница 73: ...the average slope If paper speeds other than 10 and 30 mm sec have been used the determined reverberation times should be multiplied or divided by factors of 10 Example 50 dB Range Potentiometer Pape...

Страница 74: ...s rack mounted then a special frame is necessary In this case the instrument metal case is secured to the frame by four screws This whole assembly is then mounted in the rack Finally if it is prefered...

Страница 75: ...equency In relation to the Lin characteristic and at rated load impedance within o 5 dB for 1 h octave and 2 dB for lh octave filters 2 dB for the 31 5 and 63 Hz c s filters According to the proposed...

Страница 76: ...separate 9 V DC o 7 rnA or 20 90 V DC o 7 7 rnA re spectively Accessories Included Cabinet I 1612 mounted into Alluminium alloy cabinet Mahogany case Frame for 19 rack 3 screened plugs JP 0018 Batter...

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Страница 80: ...Orboe Print Copenhagen June 1965...

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