Related Manuals for Kistler 8762A Series
Summary of Contents for Kistler 8762A Series
- Page 1 Instruction Manual Ceramic Shear Triaxial IEPE Accelerometers Types 8762A..., 8763B..., 8764B... ä 8762A_002-681e-03.16 This datasheet has been downloaded from http://www.digchip.com at this page...
- Page 3 Information in this document is subject to change without 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.
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Page 4: Table Of Contents
4.7 Mass Loading Effects ......................18 5. Operating Instructions ........................19 5.1 Powering ..........................19 5.1.1 Using "Built-In" Power Sources................19 5.1.2 Kistler Couplers ......................20 5.1.3 The Constant Current Power Supply/Coupler............20 5.1.4 Sensor Power-Up ....................23 5.1.5 Overload Recovery ....................23 5.1.6 Supply Voltage Effects ....................24 5.1.7 Driving Long Cables ....................24... - Page 5 Content 6. Technical Data ..........................32 7. Calibration and Maintenance......................33 7.1 Calibration ..........................33 7.2 Maintenance .........................33 8. Troubleshooting ..........................34 9. Storage and Transit Considerations .....................35 10. Warranty ............................36 11. Declaration of Conformity......................37 Total pages: 40 8762A_002-681e-03.16 Page 3...
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Page 6: Introduction
To the extent permitted by law Kistler accepts no liability if this instruction manual is not followed, or if products other than those listed under Accessories are used. -
Page 7: Important Information
Important Information 2. Important Information It is essential for you to review the following information, which is intended to ensure your personal safety when working with the ceramic shear triaxial IEPE Accelerometers and contribute toward a longer service life. 2.1 For Your Safety This product has been manufactured in compliance with current valid safety regulations. -
Page 8: Precautions
2.3 Disposal of Electronic Equipment Do not discard old electronic equipment in municipal trash. For disposal at end of life, please return this product to the nearest authorized electronic waste disposal service or contact your Kistler sales office for disposal instructions. 8762A_002-681e-03.16... -
Page 9: Product Description
(acceleration) is derived from a force measurement. 3.2 Ceramic Annular Shear Background A typical Kistler sensing assembly (see Fig. 1) consists of a center post, piezoelectric ceramic element and a seismic mass mechanically preloaded. Since the unit is operated in a shear arrangement, it will sense motion perpendicular to the base. -
Page 10: Low Impedance (Iepe) Output
(cross-axis) motion, and the effects of base strain than a compression element. Kistler first introduced this design (annular shear) using a ceramic element that has become a standard with many users. Ceramic shear accelerometers employ similar ring or annular shear designs that provide the same advantages. -
Page 11: Accessories
Product Description Low impedance accelerometers are ideally suited for appli- cations where long cables are required, in high humidity or other harsh environments. In addition, they eliminate the dif- ficulties associated with high impedance outputs by providing a voltage signal with low impedance and high frequency re- sponse. -
Page 12: Studs
· Extension cable for triaxial accelerometers Type 1511x · Output cable BNC pos. to BNC pos. * Please refer to data sheet 000-471 for more details. Contact Kistler for any of your cable needs. Table 3: Most commonly used cables from Kistler (x = cable length to be specified in meters) 8762A_002-681e-03.16... -
Page 13: Nomenclature
Product Description 3.5 Nomenclature Throughout this manual, special designations nomenclature are used for terms and concepts relating to ceramic shear sensors. These are identified in Table 4. Term Definition Full-scale DC supply voltage (a/k/a compliance voltage) Bias voltage (from calibration certificate) Frequency in Hz Output resistance of the coupler Input resistance of the coupler... -
Page 14: Installation
Ceramic Shear Triaxial IEPE Accelerometers 4. Installation This section provides the user with a quick means of placing the Kistler ceramic shear triaxial IEPE accelerometers into operation. Careful installation will result in optimal, high frequency response, accuracy and reliability. Dimensional characteristics can be found on their respective data sheets. -
Page 15: Screw And Stud Mounting
Type 8764B... has a center through-hole design that accepts a screw with a special off-ground treatment to ensure off-ground operation when installed. Most Kistler mounting studs are machined from beryllium copper for high strength and low modulus of elasticity, coupled with high elastic limits. -
Page 16: Direct Adhesive Mounting
Ceramic Shear Triaxial IEPE Accelerometers Stud type mm [in] mm [in] 8402 10-32 4.0 [0.16] 8.0 [0.31] 8411 8.0 [0.31] 14.0 [0.55] 8416 10–32 4.0 [0.16] 8.0 [0.31] 8418 8.0 [0.31] 14.0 [0.55] 8420 6.0 [0.24] 8.0 [0.31] 5−40 8446AE2 4−40 4.0 [0.16] 8.0 [0.31]... -
Page 17: Mounting With Wax
4.4 Mounting with Wax Bee's wax has been used as a mounting agent for many years. The provided Petro Wax (Kistler Type 8432 or P/N P102 from Katt and Associates; P.O. Box 623, Zoar, Ohio 44697, or equivalent) is a good replacement for bee's wax. It is formulated to provide improved frequency response. -
Page 18: Summary Of Mounting Methods
Ceramic Shear Triaxial IEPE Accelerometers 4.5 Summary of Mounting Methods Magnetic base Magnetic base Adhesive mounting Direct adhesive Isolated stud Stud mounting Probe with foil base mounting base mounting Mounting Accessory Type Advantages Disadvantages Remarks Method Probe Quick measurement Lower accuracy Magnetic base 8450A, 8452A Easy &... -
Page 19: Securing Cables
Secure cables with a cable clamp. Tape is acceptable on temporary installations. Fig. 2: CORRECT cable strain relief Fig. 3: INCORRECT cable strain relief *See Section 3.4.2 for cables available upon request from Kistler. 8762A_002-681e-03.16 Page 17... -
Page 20: Mass Loading Effects
Ceramic Shear Triaxial IEPE Accelerometers 4.7 Mass Loading Effects When a device such an accelerometer is attached to a test article, the acceleration to be measured will be altered. These effects can be reduced significantly by the proper selection of the measuring accelerometer. 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 specimen. -
Page 21: Operating Instructions
Many FFT analyzers and vibration monitors are available with internal accelerometer power supplies that provide constant current power to Kistler and other low impedance sensors. These power supplies are typically known as constant current source supplies. The industry also recognizes these power sources as voltage mode piezoelectric units by the universal designation, Integral Electronic PiezoElectric (IEPE). -
Page 22: Kistler Couplers
Ceramic Shear Triaxial IEPE Accelerometers 5.1.2 Kistler Couplers Kistler offers a comprehensive line of power supply/ couplers and dual mode amplifiers. They are designed for compatibili- ty with ceramic shear accelerometers. Please refer to Kistler Acceleration catalog ref. 900-380. 5.1.3 The Constant Current Power Supply/Coupler... - Page 23 Operating Instructions A source resistor (Rs), while located in the coupler, is part of the source follower circuit. In order for the Piezotron to pro- vide enough gain, Rs must have a high dynamic resistance while being able to provide enough current (low DC resistan- ce) as not to affect the high frequency response of the sys- tem.
- Page 24 Ceramic Shear Triaxial IEPE Accelerometers Operating within the voltage range of 20 ... 30 VDC ensu- res full, undistorted ±5 V output amplitude (see Fig. 6). If the source voltage is reduced, distortion and clipping of the signal will occur if one attempts to use the full amplitude range of the accelerometer (see Fig.
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Page 25: Sensor Power-Up
Operating Instructions 5.1.4 Sensor Power-Up When power is first applied to the sensor through an AC cou- pled coupler, a voltage will appear at the output of the coup- ler (see Fig. 8). As the coupling capacitor discharges, the DC output from the coupler will drop to zero volts. -
Page 26: Supply Voltage Effects
For your convenience, a chart is provided below (see Table 8). The values provided are based on a cable capacitance of 98 pF/m [30 pF/ft]. A list of cables available from Kistler can be found in Section 3.3.2. 8762A_002-681e-03.16... - Page 27 Operating Instructions Current (mA) Current (mA) Maximum Cable Length Required for Required for Frequency m (ft) Output Signal Output Signal ±5 % ±1 V ±5 V 300 [1,000] 10 kHz 600 [2,000] 300 [1,000] 9 kHz 600 [2,000] 300 [1,000] 8 kHz 600 [2,000] 300 [1,000]...
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Page 28: Ground Loops
Ceramic Shear Triaxial IEPE Accelerometers Fig. 10: Maximum Piezotron current as a function of oper- ® ating temperature The equation for computing the maximum current for a spe- cific temperature is: = 0.16 (150 − T Nomenclature: I = Current in mA T = Temperature in °Celsius 5.1.8 Ground Loops The ground loop is one of the most common causes of... - Page 29 Operating Instructions While the amount of current might seem insignificant, the measurement levels are generally very low and the ground current will appear on the signal at a measurable level. There can be many causes of ground loops in a complete measu- rement system.
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Page 30: Ground Isolation
Type 8762A is made of anodized aluminum which makes the sensor already ground isolated. Type 8763B can be ground isolated with the use of an isolated accessory, such as Kistler Type 8440K01. Through aluminum anodized base plate and supplied screws, Type 8764B is also ground isolated. -
Page 31: Frequency Response Limits
Ceramic shear accelerometers are specified with maximum variations of ±5 and ±10 %. Kistler uses the industry standard reference frequency of 100 Hz in the U.S., and 1,000 rads [159.2 Hz] internationally. Some users may be more familiar with the common frequency response standard for electronic equipment, which is gene- rally ±3 dB. -
Page 32: Low Frequency Limitations - Accelerometer
Ceramic Shear Triaxial IEPE Accelerometers 0.22 Fig. 14: Typical frequency response of a piezoelectric accelerometer Section 4 outlines important information regarding mounting. It is important to follow these mounting instructions in order to ensure optimal transmissibility at high frequencies. Moun- ting to rough surfaces, using soft adhesives and magnetic mounts, will limit the high frequency range to a value lower than the specified frequency range. -
Page 33: Low Frequency Limitations - Coupler And Read-Out Instrumentation
Operating Instructions 5.1.14 Low Frequency Limitations - Coupler and Read-Out Instrumentation When making low frequency measurements with ceramic shear accelerometers, it is important for the user to consider the effects of the coupler and measurement instrumentation on the low frequency response. If the coupler selected includes an isolated amplifier, the low frequency cutoff will be specified in the coupler data sheet and the read-out instrument's specifications. -
Page 34: Technical Data
Ceramic Shear Triaxial IEPE Accelerometers 6. Technical Data For detailed specifications, please refer to each sensor Type's corresponding data sheet or contact Kistler for more information. Recommended data sheets: Accessories 000-281 Cables 000-471 Type 8762A... 000-456 Type 8763B... 000-928 Type 8764B... -
Page 35: Calibration And Maintenance
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. -
Page 36: Troubleshooting
Kistler couplers are equipped with a bias monitor, which can be used to check the cable integrity and detect malfunctions in the accelerometer. Use the bias monitor as follows: ƒ... -
Page 37: Storage And Transit Considerations
Storage & Transit Considerations 9. Storage and Transit Considerations If the instrument is to be stored or transported for an extended period of time, please follow these safety precautions: ƒ The temperature should be maintained between –20 °C and 60 °C [–4 °F and 140 °F]. ƒ... -
Page 38: Warranty
Ceramic Shear Triaxial IEPE Accelerometers 10. Warranty Please reference the Kistler Instrument Standard Product Warranty under Terms and Conditions for Sales and Service. 8762A_002-681e-03.16... -
Page 39: Declaration Of Conformity
Declaration of Conformity 11. Declaration of Conformity 8762A_002-681e-03.16 Page 37... - Page 40 Ceramic Shear Triaxial IEPE Accelerometers 8762A_002-681e-03.16...
- Page 41 Declaration of Conformity 8762A_002-681e-03.16 Page 39...
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Page 42: Total Pages
Ceramic Shear Triaxial IEPE Accelerometers KONFORMITÄTSERKLÄRUNG / DÉCLARATION DE CONFORMITÉ Manufacturer Kistler Instrument Corporation Hersteller / Fabricant Amherst, New York 14228 USA declares that the product erklärt, daß das Produkt / déclares que le produit Name / Name / Nom PiezoBEAM®...
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