Subscribe to Our Youtube Channel
Related Manuals for Kistler 8714B Series
Summary of Contents for Kistler 8714B Series
- Page 1 Instruction Manual Ceramic shear accelerometers (Low impedance, Voltage mode) Types 8714B..., 8740A..., 8774B..., 8775A..., 8776B..., 8778A..., 8784A..., 8786A... ä 8714B_002-777e-10.23...
- 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 in the content without obligation to notify any person or organization of such changes or improvements.
-
Page 4: Table Of Contents
5.8 Summary of mounting methods ...................20 5.9 Securing cables ........................21 5.10 Mass loading effects ......................22 6. Operating instructions ........................23 6.1 Powering ..........................23 6.1.1 Using "Built-In" power sources................23 6.1.2 Kistler couplers .......................24 6.1.3 The constant current power supply/coupler ............24 6.1.4 Sensor power-up ....................26 Page 2 8714B_002-777e-10.23... - Page 5 Content 6.1.5 Overload recovery ....................27 6.1.6 Supply voltage effects .....................27 6.1.7 Driving long cables ....................28 6.1.8 Ground loops ......................30 6.1.9 Ground isolation ......................32 6.1.10 Frequency Response limits ..................32 6.1.11 Frequency Response definition and standards .............32 6.1.12 High Frequency limitations ...................33 6.1.13 Low Frequency limitations - accelerometer ............34 6.1.14 Low Frequency limitations - coupler and read-out instrumentation ......35 7.
-
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
Information contained herein may be subject to change. If there is any questions concerning the operation of this product, contact your Kistler representative for assistance. 2.2 For your safety This product has been manufactured in compliance with current valid safety regulations. -
Page 8: Precautions
2.4 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. 8714B_002-777e-10.23... -
Page 9: Nomenclature
'smart sensor' version where an electronic data sheet , showing basic accelerometer information, may be viewed. This data sheet referred to by the acronym TEDS (Transducer Electronic Data Sheet) requires additional system components. Contact Kistler for details. 8714B_002-777e-10.23 Page 7... -
Page 10: Product Description
Ceramic shear accelerometers 3. Product description Kistler ceramic shear IEPE accelerometers are shear mode vibration measuring instruments. A self-generating piezoelectric sensing element is used in conjunction with the built-in internal circuit Piezotron charge converter. ® As with most accelerometers, the sensitivity of this series is expressed in terms of the ratio of the electrical output to applied acceleration (e.g. -
Page 11: Technical Information, Functional Description
(acceleration) is derived from a force measurement. 4.2 Ceramic shear background A typical Kistler sensing assembly (See Fig. 1) consists of a center post, piezoelectric ceramic element and a seismic mass mechanically preloaded, with or without a preload bolt. -
Page 12: Low Impedance (Iepe) Output
(cross-axis) motion, and the effects of base strain than a compression element. Kistler initially introduced the Shear design concept using a quartz element that has become a standard with many users. Ceramic Shear Accelerometers employ similar ring shear and annular shear designs that provide the same advantages. - Page 13 Product description Measuring Connecting Amplifying/Acquiring Type 1761B... Kistler LabAmp Type 5165A... Sensor without Type 87xx... Signal Conditioning & Data integral cable Acquisition ( Analog & Digital Output) 5050B 8202A 5165A Sensor with Type 87xx...sp + Type 1721 IEPE Compatible Data Acquistion...
-
Page 14: Accessories
Ceramic shear accelerometers 4.4 Accessories All accelerometers designed for stud mounting are supplied with the appropriate studs. See Table 3 for more details re- garding mounting stud dimensions, or refer to the unit speci- fications listed on the respective data sheet for each model. 4.4.1 Studs Type Used with... -
Page 15: Cables
· Flexible PVC jacketed extension cable · Single-axis voltage mode/IEPE sensors * Please refer to data sheet 000-471 for more details. Contact Kistler for any of your cable needs. Table 4: Most commonly used cables from Kistler (x = cable length to be specified in meters) 8714B_002-777e-10.23... -
Page 16: Installation
Ceramic shear accelerometers 5. Installation 5.1 General For proper operation of Ceramic Shear Accelerometers, care must be taken during the installation process. Careful installation will result in optimal high frequency response, accuracy and reliability. Dimensional characteristics appear on their respective data sheets. Type 8714B... -
Page 17: Surface Preparation
Types 8740A..., 8784A5 and 8786A5 have threaded mounting holes machined in the base to accept a stud. Kistler offers optional studs for convenient mounting in holes other than threaded for 10-32. Most Kistler mounting studs are machined from beryllium copper for high strength and low modulus of elasticity, coupled with high elastic limits. -
Page 18: Direct Adhesive Mounting
Ceramic shear accelerometers Stud type mm [in] mm [in] 8402 10-32 UNF 4.0 [0.16] 8.0 [0.31] 8410 10-32 UNF 4.0 [0.16] 8.0 [0.31] 8411 8.0 [0.31] 14.0 [0.55] 8430K01 6-32 5.0 [0.20] 9.0 [0.35] 8430K02 5.0 [0.20] 9.0 [0.35] Integral 10-32 3.0 [0.11] 6.0 [0.24]... - Page 19 Installation shock. Measuring information could be flawed if the accelerometer is not held in close contact to the surface under study. When adhesive mounting an accelerometer with a tapped hole, make certain that no adhesive is allowed to enter the hole.
-
Page 20: Adapter For Adhesive Mounting
5.6 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 21: Magnetic Mounting
Installation 5.7 Magnetic mounting Magnetic mounting is a convenient way to take measurements on ferro-magnetic surfaces. Magnetic mounting adds considerable mass and reduces high frequency response. Make sure that the mounting surface is flat and clean. An oil or grease film greatly enhances the coupling, hence improving the working frequency range. -
Page 22: Summary Of Mounting Methods
Ceramic shear accelerometers 5.8 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 23: Securing Cables
Installation 5.9 Securing cables Fig. 5 and Fig. 6 depict the correct and incorrect methods for installing cables. Allow 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 and connector fatigue failures. -
Page 24: Mass Loading Effects
Ceramic shear accelerometers 5.10 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 25: 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 26: Kistler Couplers
Ceramic shear accelerometers 6.1.2 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. 6.1.3 The constant current power supply/coupler... - Page 27 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 28: Sensor Power-Up
Ceramic shear accelerometers Fig. 9: Output signal when operated with 28 V supply Fig. 10: Example of output distorting and clipping when supply voltage is low 6.1.4 Sensor power-up When power is first applied to the sensor through an AC coupled coupler, a voltage will appear at the output of the coupler (see Fig. -
Page 29: Overload Recovery
Operating instructions 6.1.5 Overload recovery Whenever the charge amplifier is driven by a signal excee- ding the normal operating range, certain components will be- come non-operational. During this non-operational state, the amplifier components are protected from overload damage. The amount of time required for recovery from an overload depends upon several factors. -
Page 30: Driving Long Cables
For your convenience, a chart is provided below (see Table 7). 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 4.4.2. Current (mA) - Page 31 Operating instructions The current requirements can be calculated using the follow- ing equation: Ic = 2π fCE Nomenclature: Ic = Current in Amperes f = Frequency in Hz C = Capacitance in Farads E = Output in Volts, Peak Never use more current than required to make the desired measurement.
-
Page 32: Ground Loops
Ceramic shear accelerometers 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 6.1.8 Ground loops The ground loop is one of the most common causes of ground noise. - Page 33 Fig. 15: The current path is broken with the use of a ground isolation pad Fig. 16: Isolated accelerometer eliminates current path Kistler offers isolation mounting studs for non-isolated ceramic shear accelerometers. See Section 6.1.9 for details. 8714B_002-777e-10.23 Page 31...
-
Page 34: Ground Isolation
Type 8778A is ground isolated due to its aluminum hard anodized case. Types 8740A..., 8784A5 and 8786A5 can achieve ground isolation with a ground isolation pad, such as Kistler Type 8436. 6.1.10 Frequency Response limits All accelerometers have specified frequency limits, which are a function of the mechanical and electrical design. -
Page 35: High Frequency Limitations
Operating instructions 6.1.12 High Frequency limitations The inherent high frequency limit of an accelerometer is a function of its mechanical characteristics. Ceramic shear accelerometers can be represented as an undamped, single degree-of-freedom, spring-mass system. As seen with any single degree-of-freedom system, a reso- nance condition will occur causing the sensitivity to increase with frequency. -
Page 36: Low Frequency Limitations - Accelerometer
Ceramic shear accelerometers 6.1.13 Low Frequency limitations - accelerometer The low frequency response of accelerometers is an elec- trical limitation. The ceramic shear is designed for low frequency drift, caused by temperature variations, to be virtu- ally eliminated. At low frequencies, the amplifier input circuit acts as a single-order, high-pass filter whose amplitude and phase are: 2πf (τ) —... -
Page 37: Low Frequency Limitations - Coupler And Read-Out Instrumentation
Operating instructions 6.1.14 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 38: Technical Data
Ceramic shear accelerometers 7. 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 8714B... 000-602 Type 8740A... 003-633 Type 8774B... and 8776B... -
Page 39: 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 40: Troubleshooting
Check for possible intermittent cables. Faulty cables are the most common cause of accelerometer measurement prob- lems. 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:... -
Page 41: Type 8778A500M14 Power & Signal Replacement Leads
Calibration & maintenance 8.4.1 Type 8778A500M14 power & signal replacement leads Type 8778A500M14 accelerometer allows the end user to re-attach the power & signal leads in the event they beco- me disconnected due to rough handling during installation or removal from the test structure. A twisted pair of red and black 36 gauge wire conducts power to and signal from the ultra miniature accelerometer. -
Page 42: Cleaning
Ceramic shear accelerometers Before attempting to re-attach the wires, some thought should be given restraining the accelerometer from moving during the soldering process and holding the tinned wire so that it lays length wise along the side of a pin. If the accelero- meter body is to be restrain by clamping in a small vise, be extremely careful that the housing is not crushed. -
Page 43: Calibration
Calibration & maintenance 8.6 Calibration 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. -
Page 44: Storage And Transit Considerations
Ceramic shear accelerometers 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 45: Warranty
Warranty 10. Warranty Please reference the Kistler Instrument Standard Product Warranty under Terms and Conditions for Sales and Service. 8714B_002-777e-10.23 Page 43... -
Page 46: Declaration Of Conformity
EU-Konformitätserklärung Déclaration UE de conformité The manufacturer / Der Hersteller / Le Fabricant: Kistler Instrument Corporation, 75 John Glenn Drive, Amherst, NY 14228 hereby declares that the product / erklärt hiermit, dass das Produkt / déclare que le présente produit:... - Page 47 EU-Konformitätserklärung Déclaration UE de conformité The manufacturer / Der Hersteller / Le Fabricant: Kistler Instrument Corporation, 75 John Glenn Drive, Amherst, NY 14228 hereby declares that the product / erklärt hiermit, dass das Produkt / déclare que le présente produit:...
- Page 48 EU-Konformitätserklärung Déclaration UE de conformité The manufacturer / Der Hersteller / Le Fabricant: Kistler Instrument Corporation, 75 John Glenn Drive, Amherst, NY 14228 USA hereby declares that the product / erklärt hiermit, dass das Produkt / déclare que le présente produit:...
- Page 49 EU-Konformitätserklärung Déclaration UE de conformité The manufacturer / Der Hersteller / Le Fabricant: Kistler Instrument Corporation, 75 John Glenn Drive, Amherst, NY 14228 hereby declares that the product / erklärt hiermit, dass das Produkt / déclare que le présente produit:...
- Page 50 EU-Konformitätserklärung Déclaration UE de conformité The manufacturer / Der Hersteller / Le Fabricant: Kistler Instrument Corporation, 75 John Glenn Drive, Amherst, NY 14228 hereby declares that the product / erklärt hiermit, dass das Produkt / déclare que le présente produit: Name / Name / Nom Micro K-SHEAR®...
- Page 51 EU-Konformitätserklärung Déclaration UE de conformité The manufacturer / Der Hersteller / Le Fabricant: Kistler Instrument Corporation, 75 John Glenn Drive, Amherst, NY 14228 hereby declares that the product / erklärt hiermit, dass das Produkt / déclare que le présente produit:...
-
Page 52: Total Pages
EU-Konformitätserklärung Déclaration UE de conformité The manufacturer / Der Hersteller / Le Fabricant: Kistler Instrument Corporation, 75 John Glenn Drive, Amherst, NY 14228 hereby declares that the product / erklärt hiermit, dass das Produkt / déclare que le présente produit:...
Need help?
Do you have a question about the 8714B Series and is the answer not in the manual?
Questions and answers