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Kistler 8770A Operating Instructions Manual

Impedance head acceleration-force sensor
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Instruction
Manual
Impedance Head
Acceleration-Force
Sensor
Type 8770A
ä
002-097e-04.98
(B08.8770Ae)

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Summary of Contents for Kistler 8770A

  • Page 1 Instruction Manual Impedance Head Acceleration-Force Sensor Type 8770A ä 002-097e-04.98 (B08.8770Ae)
  • Page 2 Instrument Corp., 75 John Glenn Drive, Amherst, NY 14228, USA Phone (716) 691-5100, Fax (716) 691-5226, e-mail kicsales@kistler.com Instrumente AG Winterthur, Postfach 304, CH-8408 Winterthur, Switzerland Phone (052) 224 11 11, Fax (052) 224 14 14, e-mail sales@kistler.ch B08.8770Ae - 04.98...

  • Page 3: Table Of Contents

    2. Important Guidelines ........................4 2.1 For your safety ........................ 4 2.2 Precautions ........................4 2.3 Using This Manual ......................5 2.4 Impedance Head Type 8770A ..................5 2.5 Manual Nomenclature..................... 5 3. General Description ........................6 3.1 Supplied Items ........................ 6 4.
  • Page 4 Type 8770A Impedance Head Acceleration-Force Sensor Page 3 7. Maintenance and Calibration ...................... 22 7.1 General ........................... 22 7.2 Trouble Shooting......................22 7.3 Repairs..........................23 7.4 Cleaning .......................... 23 7.5 Calibration ........................23 8. Accessories ..........................24 8.1 Studs ..........................24 8.2 Adhesive Mounting Pads ....................

  • Page 5: Introduction

    Type 8770A Impedance Head Acceleration-Force Sensor Page 4 1. Introduction By choosing a Kistler Impedance Head, you have opted for an instrument distinguished by precision, long life and technical innovation. Please read these instructions carefully before installing and operating these instruments.

  • Page 6: Using This Manual

    We have endeavored to arrange these instructions in a manner that allows for easy location of topics of interest. Your Kistler representative is also available to assist with any questions. Information contained herein may be subject to change.

  • Page 7: General Description

    Type 8770A Impedance Head Acceleration-Force Sensor Page 6 3. General Description The Kistler Impedance Head sensor is an acceleration and force measuring instrument. Mechanical impedance can be derived directly from the measurements made with this device. The output signals are low impedance, voltage mode, therefore no charge amplifier or special cabling is necessary.

  • Page 8: Technical Information, Functional Description

    Type 8770A Impedance Head Acceleration-Force Sensor Page 7 4. Technical Information, Functional Description Piezoelectric Measuring Concept Contained within the impedance head housing is a miniature electronic circuit. This circuit converts the high impedance charge signals generated by the piezoelectric elements into low impedance voltage output signals with an output impedance typically below 100 Ohms.

  • Page 9: Installation

    32 microinches (0.8 micrometers). Stud Mounting Impedance Head type 8770A is specifically designed for stud mounting. Most Kistler mounting studs are machined from Beryllium Copper for high strength and low modulus of elasticity, coupled with high elastic limits.

  • Page 10: Direct Adhesive Mounting

    In addition to providing a means of adhesive mounting, the mounting pad provides ground isolation. Use pad type 8436 for the 8770A sensor. B08.8770Ae-04.98...

  • Page 11: Securing Cables - Typical Sensor Application

    Type 8770A Impedance Head Acceleration-Force Sensor Page 10 Securing Cables - Typical Sensor Application Figures 3 and 4 show the correct and incorrect ways for installing cables. Allow a sufficient radius to ensure a proper strain relief. The actual radius will depend on the cables being used.

  • Page 12: Operation

    Transducer simulator for trouble shooting or checking system performance. It provides an ideal means to confirm transducer location or detect inoperative cables. Connects directly to the input of any Kistler coupler or any ICP compatible power source. Output frequencies of 100 Hz or 1000 radians/second, sine or square wave with adjustable amplitude.

  • Page 13: The Constant Current Power Supply/Coupler

    Type 8770A Impedance Head Acceleration-Force Sensor Page 12 6.1.3 The Constant Current Power Supply/Coupler To better understand the purpose of the current source, a review of the Piezotron impedance converter is in order. Figure 5 is a simplified schematic diagram of a piezoelectric system. When excited, the quartz element produces a charge proportional to the measurand.
  • Page 14 Type 8770A Impedance Head Acceleration-Force Sensor Page 13 Figure 6 (previous page) shows a schematic of a simple power supply/coupler. DC power is supplied from a 24 volt source such as a regulated power supply or batteries. One advantage of the Piezotron system is the fact that a simple two wire coaxial cable is used for both power and signal.

  • Page 15: Sensor Power-Up

    Type 8770A Impedance Head Acceleration-Force Sensor Page 14 Low Supply Distortion and Voltage Clipping Occurs Figure 7B: 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 Figure 8A).

  • Page 16: Supply Voltage Effects

    The voltage mode Piezotron circuit allows for long cable runs with low noise susceptibility. Most laboratory instruments with built-in ICP power provide current in the range of 2 to 4 mA. Most Kistler couplers are set at the factory to provide 4mA of source current. 4mA is a good compromise value for maximum frequency response and high reliability.
  • Page 17 Type 8770A Impedance Head Acceleration-Force Sensor Page 16 The current requirements can be calculated using the following equation: π Where: = Current in Amperes = Frequency in Hz = Capacitance in Farads = Output in Volts, Peak Never use more current than required to make the desired measurement.

  • Page 18: Ground Loops - Typical Sensor Application

    Type 8770A Impedance Head Acceleration-Force Sensor Page 17 Ground Loops - Typical Sensor Application The ground loop is one of the most common causes of ground noise. It will usually manifest itself as unwanted noise occurring at the line frequency (50 - 60 Hz).

  • Page 19: Frequency Response Limits

    Impedance Head sensors are specified with maximum variations of ±5% to ±10%. Kistler uses the industry standard reference frequency of 100Hz. Many users may be more familiar with the common frequency response standard for electronic equipment which is generally ±3dB.
  • Page 20 Type 8770A Impedance Head Acceleration-Force Sensor Page 19 Quartz Impedance Heads have a Q of approximately 10 to 40 and therefore the phase angle can be written as:   ≅ ≤   Phase Lag (deg)   of a single degree of freedom system...

  • Page 21: Low Frequency Limitations - Transducer

    The low frequency limit of Kistler Impedance Head sensors is defined as the point where the response is -5% (also -10% where specified) below the reference point (100 Hz).

  • Page 22: Low Frequency Limitations - Coupler And Readout Instrumentation

    Type 8770A Impedance Head Acceleration-Force Sensor Page 21 Figure 13: Frequency and Phase Response of the independent channels of Impedance Head sensors at Low Frequencies 6.4.4 Low Frequency Limitations - Coupler and Readout Instrumentation When making low frequency measurements with Impedance Head sensors it is important that the user consider the affects of the coupler and measurement instrumentation on the low frequency response.

  • Page 23: Maintenance And Calibration

    An instrument such as the Kistler Transducer Simulator type 5350 is ideal for this test. Some Kistler couplers are equipped with a bias monitor which can be used to check the cable integrity and detect malfunctions in the Impedance Head. Use the bias monitor as follows: A.

  • Page 24: Repairs

    Calibration services are available from Kistler. Kistler acceptance test instrumentation is in conformance with MIL-STD-45662A. A calibration certificate will be supplied showing calibration results from standards traceable to NIST.

  • Page 25: Accessories

    Type 8770A Impedance Head Acceleration-Force Sensor Page 24 8. Accessories Studs The following studs can be used with Kistler Impedance Heads: Type 8402 10-32 UNF 10-32 UNF 8410 1/4"-28 UNF 10-32 UNF 8411 10-32 UNF (Dimensions in mm) Figure 14: Mounting (Studs) Information...

  • Page 26: Warranty

    Type 8770A Impedance Head Acceleration-Force Sensor Page 25 9. Warranty The Kistler Instrument Corporation warrants all Kistler products to be free from defects in material and workmanship. All such products are warranted only under normal use and service. For Impedance Head transducers, the period of warranty is 12 months from date of shipment.

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