Kistler 8715A250M5 Скачать руководство пользователя страница 42 | Manualshive

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Kistler 8715A250M5 Скачать руководство пользователя страница 42

002-086e-01.19

Single-Axis K-Shear and PiezoStar

Accelerometers

Page 40

7. Calibration & maintenance

Calibration consists of the precise determination of the

accelerometer sensitivity by direct comparison, at various

frequencies, to a National Institute of Standards and Techno-

logy (NIST) traceable standard accelerometer. The test acce-

lerometer is attached to the top of the reference accelero-

meter in a 'back-to-back' configuration. The reference and

test accelerometer are excited at equivalent frequencies and

levels. The resulting amplitudes of both accelerometers are

then compared to determine if the test unit is within tolerance

of the specified acceptance parameters.

7.1 Calibration

7.2 Maintenance

Clean the accelerometer with Isopropyl alcohol and lint- free

paper wipes. Never use an air-blast to clean the connector; it

may deposit a water vapor film. Excess cyanoacrylate adhe

-

sive (i.e. Eastman 910, Loctite 430, etc.) on the mounting

surface may be removed with dimethylformamide or acetone.

Refer to the adhesive manufacturer's product label for recom-

mended removal agent.

Do not use an abrasive on the base surface. This can affect

the flatness, thereby reducing high frequency transmissibility.

Factory repair is recommended where trained personnel and

appropriate measuring equipment and fixtures are available.

Recalibration is recommended when returning an acce-

lerometer to the factory. Kistler is an accredited ISO 17025

Laboratory and offers such calibration services. A calibration

certificate will be supplied showing calibration results from

standards traceable to NIST.

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Содержание 8715A250M5

Страница 1: ...Instruction Manual Single Axis K Shear Accelerometers Types 8702B 8704B 8728A 8730A Single Axis PiezoStar Accelerometers Types 8703A 8705A 8712B 8715A 002 086e 01 19...

Страница 2: ...Instruction Manual Single Axis K Shear Accelerometers Types 8702B 8704B 8728A 8730A Single Axis PiezoStar Accelerometers Types 8703A 8705A 8712B 8715A 002 086e 01 19...

Страница 3: ...hout notice Kistler reserves the right to change or improve its products and make changes to the content without obligation to notify any person or organization of such changes or improvements 2006 20...

Страница 4: ...esive mounting pads 13 3 5 3 Magnetic mounting bases 13 3 5 4 Triaxial mounting cubes 14 3 5 5 Cables 15 4 Installation 16 4 1 Surface preparation 16 4 2 Stud mounting 17 4 3 Direct adhesive mounting...

Страница 5: ...nd standards 34 5 1 12 High frequency limitations 35 5 1 13 Low Frequency limitations accelerometer 36 5 1 14 Low frequency limitations coupler and read out instrumentation 37 6 Technical data 39 7 Ca...

Страница 6: ...environments Conforming to Kistler offers a wide range of products for use in measuring technology Piezoelectric sensors for measuring force torque strain pressure acceleration shock vibration and aco...

Страница 7: ...ns which may apply to the use of power line operated electrical and electronic equipment is strongly recommended Do not drop the instrument Store in the case provided and in a clean dry environ ment P...

Страница 8: ...lerometer in the container supplied The environment should be as dry clean and free from vibrations as possible Keep the connector clean and covered when not in use Follow the recommendations detailed...

Страница 9: ...ply voltage a k a compliance voltage Eb Bias voltage from calibration certificate f Frequency in Hz R1 Output resistance of the coupler R2 Input resistance of the coupler I Current in Amperes C Capaci...

Страница 10: ...portional to the applied acceleration K Shear accelerometers utilize a quartz piezoelectric crystal while PiezoStar accelerometers utilize a proprietary piezoelectric crystal to create the acceleratio...

Страница 11: ...ric material to produce an electric charge Force mass x s acceleration from Newton s second law Since m is the constant the charge produced is proportional to acceleration This is represented by the e...

Страница 12: ...All accelerometer types have a nominal output less than 100 ohms The integral impedance converter is powered by an external power source coupler that uses a two wire cable between the accelerometer an...

Страница 13: ...necting Amplifying Acquiring Analyzing Type 87 Ethernet Cable Notebook with LabAmp GUI Type 5165A Conditioning and Data Acquisition Analog Output 10 V Type 1511 Type 1761B 3 5 Accessories All accelero...

Страница 14: ...3 0 48 28 M8 8712 8451 2 8 0 11 5 0 0 20 8 8 0 34 10 32 M5 8702 8703 8704 8705 8453 3 7 0 15 5 1 0 20 9 8 0 38 M5 28 8712 Table 3 Mounting studs dimensions in mm in The following studs can be used wit...

Страница 15: ...ructure A notched mounting unit is avail able for mounting on curved surfaces Magnetic bases find use in appli cations requiring vibration monitoring of large ro tating machin ery Note that usage of s...

Страница 16: ...8502 For use with Types 8702 8703 8704 and 8705 Weight 117 grams 8510 For use with Type 8730 Weight 19 grams 8514 For use with Types 8702 and 8704 Weight 35 grams Type A B C THD X Used with 8450A 7 6...

Страница 17: ...B General purpose cable connector 10 32 pos to BNC pos Accelerometer output cable 1762B General purpose cable connector 10 32 pos to 10 32 pos Accelerometer output cable 1511sp General purpose cable c...

Страница 18: ...urface is necessary for both stud and adhesive mounted accelerometers If the surface is not completely flat the coupling between the accelerometer and the test article introduces distortion into the m...

Страница 19: ...tud does not bottom out and firmly secures the accelerometer A chamfer should be machined at the top of the mounting hole to ensure that the base of the accelerometer 2 Completely clean the surface pr...

Страница 20: ...6 4 0 25 9 6 0 37 Table 13 Stud mounting preparation 4 3 Direct adhesive mounting Some K Shear accelerometers are specifically designed for adhesive mounting i e Type 8728A500 and eventually Type 8715...

Страница 21: ...nternal electronics Remove these accelero meters using a recommended cyanoacrylate solvent e g Loctite 768 then twist with fingers If conditions permit Petro Wax see Section 4 4 is the ideal mounting...

Страница 22: ...m Kistler along with their characteristics In order to achieve the specified holding strength a thin grease film should be applied to the mounting surface Sensor Type Magnet Type Holding Strength N lb...

Страница 23: ...cyanoacrylate hot melt Epoxy Good strong coupling of sensor to specimen higher temperature capability than wax Difficult to remove sensor requires solvents removal tool and or heat Suited for more per...

Страница 24: ...low a sufficient radius to ensure a proper strain relief The actual radius will depend on the cables being used It is recommended that the cables be secured to the vibrating surface to minimize cable...

Страница 25: ...er It should be assumed that the presence of an accelerometer does not significantly affect the system response provided the dynamic mass of the accelerometer is considerably less than the test specim...

Страница 26: ...wer is within the range required by the specific PiezoStar Shear accelerometer there should be no issues with compatibility If the user plans to drive long cables over 430 ft 130 m the guidelines in S...

Страница 27: ...current source a review of the Piezotron impedance converter is in order Fig 4 is a simplified schematic diagram of the PiezoStar Shear accelerometer When excited the crystal element pro duces a charg...

Страница 28: ...upply or batteries The Piezotron system houses an advantageous two wire coaxial cable sharing both the power source and the signal across the same line Therefore it is necessary to include the capacit...

Страница 29: ...002 086e 01 19 Operating Instructions Page 27 Fig 8 Output signal when operated with 28 V supply Fig 9 Example of output distorting and clipping when supply voltage is low...

Страница 30: ...Fig 10 Behavior of the output signal during power up 5 1 5 Overload recovery Whenever the impedance converter is driven by a signal exceeding the normal operating range certain components will become...

Страница 31: ...source current 4 mA is a fair compromise value for maximum frequency response and high reliability Assuming a cable capacitance of 30 pF ft 98 pF m the full frequency range of PiezoStar Shear acceler...

Страница 32: ...ance in Farads E Output in Volts Peak Never use more current than required to make the desi red measurement Never exceed the maximum current If a requirement calls for 1 000 ft 300 m of cable and the...

Страница 33: ...ns Page 31 Fig 12 Maximum Piezotron current as a function of operat ing temperature The equation for computing the maximum current for a spe cific temperature is Imax 0 16 150 Tmax Nomenclature I Curr...

Страница 34: ...l appear on the signal at a measurable level There can be many causes of ground loops in a complete measu rement system However the ground path between the acce lerometer and coupler is among the most...

Страница 35: ...Fig 14 The current path is broken with the use of a ground isolation pad Fig 15 Isolated accelerometer eliminates current path Kistler offers isolation mounting studs for non isolated PiezoStar Shear...

Страница 36: ...response limits All accelerometers have specified frequency limits which are a function of the mechanical and electrical design In order to better understand the measurement process and limitations t...

Страница 37: ...to increase with frequency It is desirable to have a uniform frequency response over the specified frequency range As depicted in Fig 16 the sensitivity greatly increases when approaching resonance A...

Страница 38: ...tan The high pass filter has a time constant determined by the capacitance and resistance of the internal amplifier gate circuit The time constant is defined as the time required for the capacitors t...

Страница 39: ...ow frequency cutoff will be specified in the coupler data sheet and the read out instrument s specifications The actual low frequency limit will be the higher of the two For example if an FFT analyzer...

Страница 40: ...can be approximated by taking the product of the accelerometer and coupler time constants and dividing by their sum When using a simple coupler see Fig 6 the system formed by the coupler and read out...

Страница 41: ...002 086e 01 19 Technical Data Page 39 6 Technical data For detailed specifications please refer to each sensor Type s corresponding data sheet or contact Kistler for more information...

Страница 42: ...2 Maintenance Clean the accelerometer with Isopropyl alcohol and lint free paper wipes Never use an air blast to clean the connector it may deposit a water vapor film Excess cyanoacrylate adhe sive i...

Страница 43: ...reading on the bias indicator normal range should be around 11 VDC If the bias reading is high disconnect the accelerometer at the accelerometer end of the cable If the bias indicator reading decreas...

Страница 44: ...should be maintained between 20 C and 60 C 4 F and 140 F All connectors must be covered with dust caps Contamination must be prevented from entering the unit The environment should be dry and as free...

Страница 45: ...002 086e 01 19 Warranty Page 43 10 Warranty Please reference the Kistler Instrument Standard Product Warranty under Terms and Conditions for Sales and Service...

Страница 46: ...ons none keine sans conforms with the following standards mit den folgende Normen bereinstimmt est conforme aux norme EMC Emissions EMV Emission EMC Emission EN61000 6 3 2007 IEC61000 6 3 2005 PART 6...

Страница 47: ...Optionen Options none keine sans conforms with the following standards mit den folgende Normen bereinstimmt est conforme aux norme EMC Emissions EMV Emission EMC Emission EN61000 6 3 2007 IEC61000 6...

Страница 48: ...erometer Type Typ Type 8702B25 8702B50 8702B100 8702B25T 8702B50T 8702B100T T100S 8702M026 8702M027 Module Module Module none keine sans Options Optionen Options none keine sans conforms with the foll...

Страница 49: ...keine sans conforms with the following standards mit den folgende Normen bereinstimmt est conforme aux norme EMC Emissions EMV Emission EMC Emission EN61000 6 3 2007 IEC61000 6 3 2005 PART 6 3 LIGHT...

Страница 50: ...onen Options none keine sans conforms with the following standards mit den folgende Normen bereinstimmt est conforme aux norme EMC Emissions EMV Emission EMC Emission EN61000 6 3 2007 IEC61000 6 3 200...

Страница 51: ...ns none keine sans conforms with the following standards mit den folgende Normen bereinstimmt est conforme aux norme EMC Emissions EMV Emission EMC Emission EN61000 6 3 2007 IEC61000 6 3 2005 PART 6 3...

Страница 52: ...ptions Optionen Options none keine sans conforms with the following standards mit den folgende Normen bereinstimmt est conforme aux norme EMC Emissions EMV Emission EMC Emission EN61000 6 3 2007 IEC61...

Страница 53: ...ptions Optionen Options none keine sans conforms with the following standards mit den folgende Normen bereinstimmt est conforme aux norme EMC Emissions EMV Emission EMC Emission EN61000 6 3 2007 IEC61...

Страница 54: ...ptions Optionen Options none keine sans conforms with the following standards mit den folgende Normen bereinstimmt est conforme aux norme EMC Emissions EMV Emission EMC Emission EN61000 6 3 2007 IEC61...

Страница 55: ...nen Options none keine sans conforms with the following standards mit den folgende Normen bereinstimmt est conforme aux norme EMC Emissions EMV Emission EMC Emission EN61000 6 3 2007 IEC61000 6 3 2005...

Страница 56: ...odule Module Module none keine sans Options Optionen Options none keine sans conforms with the following standards mit den folgende Normen bereinstimmt est conforme aux norme EMC Immunity EMV Immunit...

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