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Summary of Contents for PCB Piezotronics 357M168
- Page 1 Model 357M168 Charge Output Accelerometer Installation and Operating Manual For assistance with the operation of this product, contact the PCB Piezotronics, Inc. Toll-free: 716-684-0001 24-hour SensorLine: 716-684-0001 Fax: 716-684-0987 E-mail: info@pcb.com Web: www.pcb.com...
- Page 2 Assistance is needed to safely operate equipment PCB Piezotronics is an ISO-9001 certified company whose Damage is visible or suspected calibration services are accredited by A2LA to ISO/IEC Equipment fails or malfunctions 17025, with full traceability to SI through N.I.S.T.
- Page 3 CAUTION Refers to hazards that could damage the instrument. NOTE Indicates tips, recommendations and important information. The notes simplify processes and contain additional information on particular operating steps. The following symbols may be found on the equipment described in this manual: This symbol on the unit indicates that high voltage may be present.
- Page 4 PCB工业监视和测量设备 - 中国RoHS2公布表 PCB Industrial Monitoring and Measuring Equipment - China RoHS 2 Disclosure Table 有害物质 镉 汞 铅 (Pb) 六价铬 (Cr(VI)) 多溴联苯 (PBB) 多溴二苯醚 (PBDE) 部件名称 (Hg) (Cd) 住房 PCB板 电气连接器 压电晶体 环氧 铁氟龙 电子 厚膜基板 电线 电缆 塑料 焊接...
- Page 5 Component Name Hazardous Substances Lead (Pb) Mercury (Hg) Cadmium (Cd) Chromium VI Polybrominated Polybrominated Compounds Biphenyls (PBB) Diphenyl Ethers (Cr(VI)) (PBDE) Housing PCB Board Electrical Connectors Piezoelectric Crystals Epoxy Teflon Electronics Thick Film Substrate Wires Cables Plastic Solder Copper Alloy/Brass This table is prepared in accordance with the provisions of SJ/T 11364.
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Page 6: Operating Guide
General OPERATING GUIDE for use with PIEZOELECTRIC CHARGE MODE ACCELEROMETERS SPECIFICATION SHEET, INSTALLATION DRAWING AND CALIBRATION INFORMATION ENCLOSED PCB ASSUMES NO RESPONSIBILITY FOR DAMAGE CAUSED TO THIS PRODUCT AS A RESULT OF PROCEDURES THAT ARE INCONSISTENT WITH THIS OPERATING GUIDE. MANUAL: 55308 REV: A ECO: 49582... -
Page 7: Table Of Contents
TABLE OF CONTENTS OPERATING GUIDE ................................1 PIEZOELECTRIC CHARGE MODE ACCELEROMETERS ..................... 1 Cables in Explosive Atmospheres ........................... 3 High Temperature Differential Charge Output Sensor.................... 3 CABLING ..................................3 General Precautions and Considerations ......................... 3 2.1.1 Proper Cable Type and Care .......................... 3 Softline Cable ................................ -
Page 8: Cables In Explosive Atmospheres
CABLING INTRODUCTION Congratulations on the purchase of a quality PCB charge mode accelerometer. In order to ensure the 2.1 General Precautions and highest level of performance for this product, it is imperative that you properly familiarize yourself with Considerations the correct mounting and installation techniques before attempting to operate this device. -
Page 9: Integraral Hardline Cable
3 INSTALLATION When using separate cables connect the cable to the accelerometer. A small amount of thread- OVERVIEW locking compound placed on the connector prior to attachment helps secure the cable during testing. In harsh environments, the connection can be Equipment Inspection sealed with silicone rubber, O-rings, and flexible heat-shrink tubing. -
Page 10: Mounting Sensor
For optimum performance and measurement find a Figure 1. Assorted Mounting Configurations and Their rigid location on the machine casing that most Effects on High Frequency accurately represents the vibration of the rotor, bearing, fan, etc. to be measured.). 3.4.1 STUD MOUNT This mounting technique requires smooth, flat contact surfaces for proper operation and is recommended for permanent and/or secure installations. -
Page 11: Route Mineral Insulated Hardline Cable
permanent mounting, substitute epoxy or another type of adhesive. STEP 3: Screw the mounting stud into the base of the accelerometer and hand-tighten. Then, screw the sensor/stud assembly into the prepared tapped hole and tighten to the recommended mounting torque as indicated on the Installation Drawing. -
Page 12: Bend Radius
3.5.2 Bend Radius The minimum bend radius (r) for both soft-line and hardline cable is determined by the cable diameter as shown below: Bends Allowed Cable Diameter Minimum Bending Radius Total 0.125” (3.2 mm) 0.60” (16 mm) 0.125” (3.2 mm) 2.0”... -
Page 13: Powering
4 POWERING 4.1 Installation Before connecting the low-noise cable from the accelerometer to the charge amplifier, be sure to ground both the charge amplifier and the cable. This ensures that an excessive static charge that may have accumulated across the accelerometer or cable is harmlessly discharged. Failure to observe this precaution can result in the destruction of the input FET of certain amplifiers. -
Page 14: Reduced Resistance At Charge Amplifier Input
This equation shows that if the input (leakage) When subjected to elevated temperature, all resistance at the charge amplifier is extremely high piezoelectric sensors/hardline cable systems exhibit decreased insulation resistance, due in part to the (approaching infinity), the output DC voltage piezoelectric element, but due mostly to the hardline approaches e , usually a very tiny voltage. -
Page 15: Low-Frequency Response Limitations
To avoid compromise of the low-frequency With the series blocking capacitor C in place as response established by the charge amplifier shown, the dynamic charge (Q) generated by the parameters and illustrated by Equation 2, the sensor element is distributed across the two product of R should be several orders of capacitors, C... -
Page 16: Accelerometer Calibration
GND position to keep spurious, thermally generated suggests a 12- to 24-month recalibration cycle for charges grounded. most piezoelectric accelerometers. It is prudent to momentarily switch to the GND Note: It is good measurement practice to verify the position even during the measurement period to performance each accelerometer... - Page 17 Figure 1. Reference Standard Accelerometer These high-accuracy devices, which are directly traceable to a recognized standards laboratory, are designed for stability, as well as configured to accept a test accelerometer. By mounting a test accelerometer to the reference standard and then connecting this combination to a suitable vibration source, it is possible to vibrate both devices and compare the data as shown in Figure 2.
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Page 18: Pcb Calibration Procedure
6.1.3 PCB CALIBRATION In addition to mounting, the selection of the proper PROCEDURE equipment is critical. Some of the more important Numerous precautions are taken at PCB to insure considerations include: 1) the reference standard accurate and repeatable results. This section must be specified and previously calibrated over the provides a brief overview of the primary areas of frequency and/or amplitude range of interest;... - Page 19 be as high as 3% or 4% for frequencies <10 Hz or >2 kHz.) Since large sensors may affect high- frequency accuracy, verify that the test sensor does not mass load the reference standard. Validate your calibration system with another accelerometer prior to each calibration session.
- Page 20 Model Number Revision: B CHARGE OUTPUT ACCELEROMETER 357M168 ECN #: 48925 Performance ENGLISH OPTIONAL VERSIONS Sensitivity(± 10 %) 1.15 pC/g .117 pC/(m/s²) Optional versions have identical specifications and accessories as listed for the standard model except where noted below. More than one option may be used.
- Page 21 PCB Piezotronics Inc. claims proprietary rights in REVISIONS the information disclosed hereon. Neither it nor any reproduction thereof will be disclosed to others DESCRIPTION without the written consent of PCB Piezotronics Inc. ADDED DIMENSIONS TO SHOW THREADED HOLE 50197 LOCATION .55 [14.0] .35 [8.8]...
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