BRUEL & KJAER 1618 Manual
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BRUEL & KJAER 1618 Manual

BRUEL & KJAER 1618 Manual

Third-octave and octave band pass filter
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BRUEL & KJAER 1618 Manual

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  • Page 1 Artisan Technology Group is your source for quality new and certified-used/pre-owned equipment SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT • FAST SHIPPING AND DELIVERY Experienced engineers and technicians on staff Sell your excess, underutilized, and idle used equipment at our full-service, in-house repair center We also offer credit for buy-backs and trade-ins •...
  • Page 2 BAND PASS FILTER TYPE 1 6 1 8 Valid from serial no. 7 2 5 5 0 7 Revision A p r i l 1 9 7 9...
  • Page 3 This apparatus has been designed and tested according t o Class II o f IEC Publication 348, Safety Requirements for Electronic Measuring Apparatus, and has been supplied in safe condition. The present instruction manual contains information and warnings which should be followed by the user to ensure safe operation and to retain the apparatus in safe condition.

  • Page 4: Table Of Contents

    CONTENTS 1. INTRODUCTION A N D SPECIFICATIONS (PRODUCT DATA) 2. C O N T R O L S 2.1. F R O N T PANEL 2.2. R E A R PANEL 3. O P E R AT I O N 3.1.
  • Page 5 1617 and 1618 Third-Octave and Octave Band Pass Filters GENERAL FEATURES: • 4 1 t h i r d -octave filter bands, centre frequencies 2 Hz to 2 0 kHz • 4 1 overlapping octave filter bands, centre frequencies 2 Hz to 2 0 kHz •...
  • Page 6 IEC 1 7 9 f o r precision sound level The T h i r d -Octave a n d O c t a v e sic system o f Type 1 6 1 8 and Type Band Pass Filters Type 1 6 1 7 a n d meters, w h i l e Ty p e 2 6 0 6 , Ty p e 2608 i s f o r RMS measurement i n 2607, a n d Type 2 1 2 0 satisfy IEC...

  • Page 7: Controls

    Description Amplifier Both B a n d Pass Filters a r e d e - C ) Input signed to operate on the signals ob- tained from the External Filter termi- nals o f t h e Measuring Amplifiers, but a n y i n p u t s i g n a l o f approxi- Low Pass Filter mately 1 V RMS w i t h a crest factor...
  • Page 8 1618 i s equal t o that which would mote control settings. Bandwidth o f be passed b y a n ideal octave o r...
  • Page 9 2309 i s possible w i t h b o t h B a n d Pass Filters. On the Type 1 6 1 7 con- 1618 trol c a n also b e exercised v i a t h e built-in IEC Interface, or an X -Y Re- Fig.6.
  • Page 10 Averaging Time Control Averaging Time This ability, allows the Type 1 6 1 7 C,F,J Slow Random to vary t h e averaging t i m e o f t h e Measuring Amplifier Type 2 6 0 7 o r B,E,H Fast 30 - Random...
  • Page 11 • _ I •E• 2306 with 8 p i n Control Socket: AO 0034 Level Recorder 2306 Ba▪ nd Pass Filter 1618 2306 with 7 • pin Control 2308 Socket: AO 0182 K Y Recorder < I Input Signal Output.
  • Page 12 1617: 1 , 4 H z to 1 8 0 kHz Supplied a s model A (light-weight metal < 0.3% with 3 , 6 V signal level 1618: 1 , 4 H z to 22 kHz cabinet), El (model A i n a mahogany cab- Linear Range: inet).

  • Page 13: Front Panel

    2. C O N T R O L S 2.1. FRONT PANEL Manual n i t e r Selector Power O n Selected Filter 770366 Range Filter Control Mode O u t p u t Input S e l e c t i v i t y Ftg.2.1.

  • Page 14: Rear Panel

    Recorder 7 7 0 3 6 7 / 1 Control 1 Fig.2.2. R e a r panel connections of the Type 1618 CHASSIS-SIGNAL-GROUND: pair of clamping terminals with a shorting strap, permiting the signal ground to be connected to the instrument chassis. See section 3.1.4.
  • Page 15 Input socket accepting the Power Cable AN 0 0 2 0 provided, for connec- LINE INPUT. tion of an AC mains supply. Before connecting the apparatus to a sup- ply, t h e mains voltage setting and fuse checks given i n section 3.1 should be carried out.

  • Page 16: O P E R At I O

    3. OPERATION 3.1. PRELIMINARY ADJUSTMENTS Before connecting a mains supply the following checks and adjustments should be car- ried out to ensure safe operation of the apparatus. 3.1.1. Selection of Mains Voltage The 1 6 1 8 may be powered from a 1 0 0 , 11 5 , 1 2 7 , 2 0 0 , 2 2 0 or 2 4 0 V (50 to 4 0 0 Hz) AC mains supply.

  • Page 17: Use With Measuring Amplifier

    The 1618 may be connected in series with, or in place of any internal weighting network o f the Measuring Amplifiers, forming a powerful measure- ment set-up for octave and third octave frequency analysis of signals.

  • Page 18: Use With Sound Level And Vibration Meters

    3.3. USE WITH SOUND LEVEL AND VIBRATION METERS Precision Sound Band Pass Filter Vibration Me er Level Meters 2511 Ext. 1618 2203, 2209 In F i l t e r 2210, 2218 To E x t . - 1 4 0 ! Filter V 0087/AO 0064...
  • Page 19 similar to that described in the Instruction Manual for the particular Sound Level Meter or Vibration M e t e r employed, except that f o r measurements i t s external filter mode should be selected. Note: For octave and third octave measurements with autoranging instruments, the man- ual range control mode should be used.

  • Page 20: R E C O R D I N G Of Frequency Analyses

    2 3 0 6 and 2 3 0 9 Level Recorders is shown in Fig.4.1. Also indicated are the ne- cessary remote control cables for application of the Level Recorder filter shift pulses to the RECORDER CONTROL II socket of the 1618 Band Pass Filter in the arrangement. Recorder Control I I...
  • Page 21 3,3 k O 410000M ' 4 1t 4.0 tfteersuji i i i • & I s tl.,..* - t ^ , a , 190291 Fig.4.2. M o d i f i c a t i o n o f L e v e l Recorders Ty p e 2 3 0 6 b e f o r e s e r i a l no.
  • Page 22 knob of the Measuring Amplifier one step anticlockwise and adjust the GAIN CON- TROL knob to obtain full scale pointer deflection on the indicating meter. 6. Keeping the reference source connected, calibrate the Level Recorder so its pen def- lection corresponds with the meter indication o f the Measuring Amplifier. This de- pends on the record mode selected and may be performed as follows: "AC and DC Log"...

  • Page 23: Use With Level Recorder Type 2307

    Each time the pen passes the chart position for a filter change, the 1618 will step to the next frequency band under the control of the Level Recorder. A t the end of the analysis the 1618 resets itself to the correct starting frequency.
  • Page 24 is given with reference to the use of the 2 3 0 7 with a 5 0 dB Range Potentiometer. For use with a 25 or 75 dB Range Potentiometer a similar procedure may be used. 1. Connect the Band Pass Filter, Measuring Amplifier and Level Recorder as shown in Fig.4.3.
  • Page 25 10. Set the PEN DRIVE to "Off" and move the pen by hand to the thick line (50 dB) at the top of the recording chart. This is printed with third octave frequency markings-w spaced at 5 mm intervals. 11. Lift up the paper clip above the paper drive sprocket wheel and pull the recording paper forward to a position where the pen is approximately 2,5 mm (third octave) or 7,5 mm (octave) before the centre of the frequency marking-w- corresponding with the centre frequency of the third octave or octave frequency band in which analysis...
  • Page 26 If it is required to change the start frequency of the analysis, lift up the guide clip above the paper drive sprocket wheel and pull the paper forward to a position where the pen is 2,5 mm (third octave) or 7,5 mm (octave) before the centre of the frequency marking- 5 corresponding with the centre frequency of the third octave or octave band in which ana- lysis i s t o commence.

  • Page 27: S P E C I A L Considerations In Frequency Analysis

    5. S P E C I A L CONSIDERATIONS IN FREQUENCY ANALYSIS 5.1. FILTER DEFINITIONS 5.1.1. The Ideal Filter An ideal band pass filter is one which has zero attenuation within its pass band and infi- nite attenuation at all other frequencies. The ideal filter is compared with a practical fil- ter in Fig.5.1.

  • Page 28: Octaves And Third Octave

    acteristic of Fig.5.1 i s equal to the area below the ideal filter characteristic when the ideal and practical filters have the same Effective Bandwidth. 5.1.3. Octaves and Third Octaves An Octave is the interval between two frequencies having a ratio of two, i.e. (5.1) f = 2 f where fu and flare upper and lower frequencies respectively.

  • Page 29: Rms Measurement And Statistical Accuracy

    (5.9) f = 1000 x 1010 f o r Third Octave filters where n = ± 1, ± 2, ± 3, etc.. (ASA standards say f = 1 0 1 0 w h e r e n is a positive or negative whole number equal to the band number.) Upper and lower filter band frequencies fu and fl follow from the effective bandwidth of the filter, B, and the relationships:...

  • Page 30: Practical Analysis Of Stationary Signals

    A simple measure o f the statistical RMS fluctuation f o r random signals (the possible range of error in the averaged RMS signal) is given by: 2 V B T A where e is the fluctuation B is the measuring bandwidth, or signal frequency bandwidth (whichever is the smaller) in Hertz TA i s the averaging time, or signal duration (whichever is the smaller) in se- conds.

  • Page 31: Writing Speed

    The major requirement for deterministic signals is that the ripple be reduced to an ac- ceptable level. Where only a single sinusoidal component is included in the bandwidth the ripple will be reduced to less than ± 1 / 4 dB for: (5.13) —...

  • Page 32: Paperspeed

    With the Type 1618, normally the step between filters will be attained in less than 2 mm (i.e. 40% of the bandwidth), and even in the very worst case of a single sinusoidal component lo- cated between two filters, it will be reached with 75% of the bandwidth.
  • Page 33 Artisan Technology Group is your source for quality new and certified-used/pre-owned equipment SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT • FAST SHIPPING AND DELIVERY Experienced engineers and technicians on staff Sell your excess, underutilized, and idle used equipment at our full-service, in-house repair center We also offer credit for buy-backs and trade-ins •...

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1617

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