BRUEL & KJAER 2512 Скачать руководство пользователя страница 1 | Manualshive

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Содержание 2512

Страница 1: ...with current standards for Hand Arm and Whole Body Including Motion Sickness mea surement The complex relationship between level frequency and time Is automatically tak en Into account In the computat...

Страница 2: ...0 Q c X Y Z The 2512 Is a single easy to operate Instru ment designed for the evaluation of the effects of vibration on the human body In agreement with current standards for Hand Arm and Whole Body...

Страница 3: ...HUMAN RESPONSE VIBRATION METER TYPE 2512 Applicable to instruments from serial number 927661 April 1981...

Страница 4: ......

Страница 5: ...3 3 CALIBRATION 23 Calibration using the Internal Reference Signal 23 Calibration using the Accelerometer Calibrator Type 4291 24 3 4 STAND ALONE OPERATION OF THE INSTRUMENT 26 4 USE WITH OTHER INSTRU...

Страница 6: ...5 3 CONNECTING EXTERNAL DEVICES TO THE 2512 VIA THE IEC INTERFACE BUS 44 Manual Mode 44 Addressable Mode Using an External Controller to Address the 2512 Individually 46 6 SERVICE AND REPAIR 48...

Страница 7: ...5 compatible interface bus for automatic readout of fu II data to alphanumeric printer calculator etc FEATURES 4322 Detects vibration in three mutually perpendicular directions Built into a flexible r...

Страница 8: ...he limits are both frequency and time dependent both factors need to be included in any calculation to obtain the degree of discomfort or danger Human Response Vibration Meter Type 251 2 is equipped w...

Страница 9: ...rm measurements Miniature Accelerometers Types 4374 and 4375 are especially suitable where a hand arm measurement handle is employed With pneumatic tools which yield very high acceleration peaks the H...

Страница 10: ...c 15 20 Motion Sickness Reduced Comfort I r I I Motion Sickne Y V Severe Discomfort 1 IA I I r l I I I I vHand Arm I I Whole Body Loog 1 d MI la I Whole Body Lateral ax and ay 25 30 l 35 O Q2 0 05 0...

Страница 11: ...dB re 1o 6 ms 2 and a t is frequency weighted accel eration in ms 2 The digital memory used to store Leq data can accommodate data from at least a 1000 s 17 min utes and up to a 53 minutes meas ureme...

Страница 12: ...o feed information to a digital recorder such as the Alphanumeric Printer Type 231 2 As the 251 2 is equipped with an addressable IEC interface it may also be coupled to a computer or calculator contr...

Страница 13: ...an be threaded through the 40 mm wide slots in the transducer to hold it in position on the seat during rough rides or for example to strap the transducer to the human chest The accelerometer pickup c...

Страница 14: ...ximum lights for 2 s Leq LED lamp indicates memory full or 53 minutes exceeded Peak LED lamp indicates overload in AC circuitry Reference Oscillator 16 Hz reference signal gives Leq 120dB 1 ms 2 0 5dB...

Страница 15: ...is on in this position and the battery voltage indicator should move from the red to the blue region indicating that the voltage from the batteries or from the external power supply where used is suf...

Страница 16: ...vailable in HAND ARM and WHOLE BODY 1 80 Hz modes of operation whose frequency ranges include 16 Hz It is not available in the WHOLE BODY 0 1 0 63 Hz MOTION SICKNESS Mode of operation because 16 Hz is...

Страница 17: ...7 and 53 minutes after the start of measurement depending on the level of the signal The value is presented in dB re 10 B ms 2 Peak dB Displays the maximum peak level which occurs during the measureme...

Страница 18: ...g filters applicable to horizontal motion When Z is selected one of the three LEDs to the right of the selected LIMIT SELECT OR pushkeys lights If X Y is selected the LED in the corresponding pushkey...

Страница 19: ...measurement can be begun by pressing Start In the Preset mode the time constant is very short 0 125 s in the HAND ARM and WHOLE BODY 1 80 Hz modes and 0 6 s in the WHOLE BODY 0 1 0 63 Hz MOTION SICKNE...

Страница 20: ...ails on powering the instrument see Section 3 2 FILTER SELECTOR SEAT ACCELEROMETER X Axis signal WARNING Never attempt to recharge normal dry cells Only nickel cadmium cells can be recharged A three p...

Страница 21: ...tte recorder For further details see Section 4 1 Controls the mode of operation of the interface 1 Ton Talk only Enables the 2512 to output data to a listener without the use of an external controller...

Страница 22: ...BODY mode and 20 mV ms 2 weighted or 2 0 mV ms 2 unweighted in the HAND ARM mode at the appropriate reference frequencies Output im pedance is 50 n and minimum load impedance is 5 kn A BNC socket to r...

Страница 23: ...e front panel Fig 3 1 Human Response Vibration Meter Type 2512 and Alphanumeric Printer Type 2312 mounted in carrying case KA 2000 and Seat Accelerometer Type 4322 ready to carry out measurements 3 2...

Страница 24: ...ing at the rear of the instrument and slide the panel from the instrument to gain access to the battery compartment as shown in Fig 3 2 The screw will remain captive in the panel Fig 3 2 Location of t...

Страница 25: ...apable of supplying full charging current 330 mA as well as sufficient current to power the instrument directly If alkaline or conventional batteries are installed the OUTPUT SELECTOR switch on the ZG...

Страница 26: ...ry Box ZG 0146 7 Power input plug of Charging Adaptor 770546 It is often convenient to have a spare set of rechargeable cells on charge outside the instrument These cannot be charged using the method...

Страница 27: ...onnect the Charger from the 2512 and carry out the Battery Check procedure described in section 3 2 1 If the cells fail to give a suitable battery check indication then they should be replaced Note Th...

Страница 28: ...sis of the instruments will be at a potential 12 V lower than that of the car chassis and could short circuit the battery if allowed to touch the car bodywork In this case the fuse will blow to protec...

Страница 29: ...field or laboratory use This instrument supplies an accurate vibration level of 10 ms 2 1 g on early models at 79 6 Hz 500 radians sec 1 directly to the accelerometer Both methods are described in the...

Страница 30: ...nt input level of the reference signal The rates of accumulation of exposure dose produced by the internal reference signal are given in Table 1 for each of the measurement modes which can be checked...

Страница 31: ...rometers without either a stud or a tapped hole for a stud should be fitted to the cementing stud DB 0756 with wax or cement 3 If using the internal battery supply of the 4291 switch the FUNCTION SELE...

Страница 32: ...he different exposure criteria i e Whole body Reduced Comfort Fatigue Decreased Proficiency and Exposure Limit and Hand Arm it accumulates at a different rate for the constant input level of the calib...

Страница 33: ...f the analysis is to be output on the IEC bus to an Alphanumeric Printer Type 2312 or to another instrument using the digital interface the INTERFACE pushkey should be pressed to activate the digital...

Страница 34: ...ARM panel When this proportion is known before making the measurement and the appropriate pushkey selected the increase in allowable exposure time resulting from the inclusion of rest periods is autom...

Страница 35: ...ront panel of the printer in the Time Data position up or in the data only position mid as required and the rightmost switch in the Auto up position 4 Turn the CLOCK CONTROL SELECTOR on the front pane...

Страница 36: ...START on the Type 2512 The data will be output automatically at intervals as defined in step 4 above in the form shown in the example of Fig 4 1 oo 13 09 ELAPSED TIME MI t UTES 0 1 0 0 0 FEA DE 123 0...

Страница 37: ...1 Turn the CLOCK CONTROL SELECTOR on the front panel of the printer to any of the four Preset Clock positions 2 Start the measurement from the 2512 by pressing the MEASUREMENT Start pushkey and reset...

Страница 38: ...m the Accelerometer Calibrator Type 4291 In practice however it will generally be found more convenient to use the internal reference signal of the 2512 This is because internal compensation is made f...

Страница 39: ...ion and any of the HAND ARM or WHOLE BODY 1 80 Hz pushkeys activated adjust the SENSITIVITY control on the Level Recorder so that the pen lies 20 d B above the line chosen in step 3 i e on the third t...

Страница 40: ...istribution to be found and the LN values the vibration level exceeded for N of the measurement time to be read directly from the cumulative distribution curve The procedure for using the 2512 with th...

Страница 41: ...2512 i e 100 dB nominal in WHOLE BODY mode or 120 dB nominal in HAND ARM mode to correspond with the bottom of the range se lected on the 4426 This in turn allows the whole of the dynamic range of the...

Страница 42: ...0 Deflection 50 60 15 40 10 20 5 0 0 OP 0102 100 110 120 130 140 150 160 170dB 810429 u 1 0 3 1 3 10 30 100 3ooms 2 WB HA Fig 4 7 Lining up the Scale SC 2363 over a statistical distribution plot of Wh...

Страница 43: ...Fig 4 10 Charge Amplifiers Type 2635 x v z Triaxial Accelerometer Type 4321 Ac er Type4291 Triaxial Seat Accelerometer Type 4322 Tape Recorder Type 7005 810430 Fig 4 9 Recording 3 axis vibration usin...

Страница 44: ...e WHOLE BODY region down to within 0 1 Hz of the its lower limiting frequency It is recommended that the Upper frequency limit is set at 0 1 kHz for WHOLE BODY measurements and 1 kHz for HAND ARM meas...

Страница 45: ...r 1000 mV Unit Out by dialling in the sensitivity of the transducer being used on the TRANSDUCER SENSITIVITY conditioning controls on the 2635 4 4 2 Analyzing Recorded Data with the 2512 The input of...

Страница 46: ...1 V On replay the sensitivity has to be reduced from 0 1 ms 2 mV to 1 ms 2 I mV to match the input sensitivity of the 2512 an attenuation of 20 dB This can be obtained by using the Adaptor WB 0706 di...

Страница 47: ...el to the Weighting Filter in Ext Filter in position the INPUT SELECTOR to Ref select any measurement mode except the O 1 0 63 Hz MOTION SICKNESS mode and press the START push key This gives a referen...

Страница 48: ...the 1621 and the SWEEP CONTROL switch pressed again A typical 23 bandwidth frequency response weighted by the Hand Arm filter of the 2512 of the vibration of an electric drill is shown in Fig 4 14 00...

Страница 49: ...o the IEC standard absolute compatibility with IEC or IEEE ANSI interfaces designed by other manufac turers cannot be unconditionally guaranteed since differences can occur within the limits of the sp...

Страница 50: ...g a desk top calculator or mini computer is used the instruments will normally be ad dressed individually by the controller This will be referred to as the addressable mode The procedures for using t...

Страница 51: ...LED in the Data pushkey comes on indicating that the 7400 is ready to receive data 4 On the 2512 a Set the ADDRESS SWITCH on the rear panel as in the table below Subswitch Number Position Function 7...

Страница 52: ...f this is not done neither has priority over the other and there is a danger of the two instruments trying to send data to each other leading to an unstable situation in which the recording device rec...

Страница 53: ...data is then output in the short ened form without the explanatory text only with a text code as shown in Fig 4 1 section 4 1 0 Addressable The remaining positions from 5 to 1 can be set to the requir...

Страница 54: ...cur which impairs its correct function then all power should be disconnected to prevent the risk of further damage For repair consult the separate Service Instruction provided or consult your local B...

Страница 55: ...o I 0 o I U _I o r _ 0 0 _ Brilel Kjcer DK 2850 NIERUM DENMARK Telephone 452800500 Telex 37316 brukadk Printed in Denmark by Naerum Offset...

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