Kinemetrics EpiSensor FBA ES-T User Manual Download Page 55

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OCUMENT

301900,

EVISION

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UIDE

Figure 19: Amplitude, phase, and step response of the EpiSensor response

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Frequency Response: Amplitude

Frequency

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Frequency Response: Phase

Frequency

Summary of Contents for EpiSensor FBA ES-T

Page 1: ...User Guide EpiSensor Force Balance Accelerometer Model FBA ES T Document 301900 Revision D October 2005...

Page 2: ...ghout this manual registered or not are Kinemetrics QuickTalk QuickLook K2 Mt Whitney Etna Etna SI EpiSensor FerriShield Microsoft Windows Kinemetrics Inc 222 Vista Avenue Pasadena CA 91107 USA Phone...

Page 3: ...EpiSensor 4 Required Cables 7 Grounding the EpiSensor 7 Safety First 7 EMI RFI 8 Powering the EpiSensor 9 Zero Adjusting the EpiSensor 10 Methods of Measuring the DC Offset 10 Performing the Zero Adju...

Page 4: ...sconnect 29 Calibration Coil Test Connector 30 Closing the EpiSensor Case 30 4 Maintenance Recommended Maintenance 33 Adjust the Accelerometers 33 Complete a Functional Test 33 Calibration 33 Desiccan...

Page 5: ...dimensions 5 Figure 3 Drilling EpiSensor mounting hole 6 Figure 4 EpiSensor Packaging Components 12 Figure 5 Large Packaging Piece Installed 13 Figure 6 Cable Installed 13 Figure 7 Second Packaging P...

Page 6: ...of recorder end of cable 840356 62 Figure 37 Parts for EpiSensor end mating connector assembly 64 Figure 38 Preparing 3 8 wide foil tape from 1 foil tape 65 Figure 39 Example of a daisychain 66 Figur...

Page 7: ...cal shock This symbol means an alternating current AC power line This symbol means a direct current DC power line derived from an AC power line This symbol indicates an electrostatic sensitive device...

Page 8: ...stem provides the correct voltage and current required by the EpiSensor under all operating conditions You are responsible for the safety of your charging system If you get power from the mains supply...

Page 9: ...und Transienten und solch eine Erdung wird nicht als Sicherheit gegen elektrischen Schock dienen Bedeutet Wechselstromzufuhr AC mit Elektroschock Gefahr Bedeutet Gleichstromzufuhr von AC Versorgung he...

Page 10: ...r t In manchen F llen wird die EpiSensor eine lange Strecke von dem Recorder entfernt Sein wo es dann m glich sein k nnte dass durch besch digte AC Wiring oder Hohe Erdbewegungen ein Spannungsuntersch...

Page 11: ...etorno a tierra para el EMI RFI y transitorios Tal polo a tierra no trabaja como un polo a tierra de seguridad para protecci n contra choques el ctricos Significa una l nea de energ a de Corriente Alt...

Page 12: ...a tierra y cumplir con todas las regulaciones locales que apliquen Sistema de Poder Carga Provisto por el Usuario Si usted provee su propio sistema de poder carga usted tiene que estar seguro que el...

Page 13: ...AFETY 7 No Opere en Atm sferas Explosivas El EpiSensor no proporciona ninguna protecci n explosiva para descargas est ticas componentes que generen arcos el ctricos No operar el equipo en una atm sfer...

Page 14: ...otection contre les interf rences magn tiques les perturbations hautes fr quences radio et contre les surtensions Cette mise terre n est pas une mise terre de s curit pour une protection contre les ch...

Page 15: ...qui remplit les conditions de la reglementation locale Option Syst me d alimentation fourni par l utilisateur Si vous fournissez votre syst me d alimentation vous devez vous assurez que le syst me fo...

Page 16: ...Pas Utiliser en Atmosph re Explosif Le EpiSensor ne comprend pas de protection contre les explosions dues aux d charges statiques ou aux composants pouvant provoquer des arcs Ne pas utiliser ces compo...

Page 17: ...also has an extensive Services Group that can install maintain and analyze the data from your EpiSensor This chapter provides an overview of the EpiSensor and inspection instructions The EpiSensor FBA...

Page 18: ...r If you find a problem note the condition of the shipping container Then contact the freight forwarder and Kinemetrics as soon as possible Caution Damage to sensors Dropping the EpiSensor onto a hard...

Page 19: ...efer to Chapter 6 for information on cable assembly These instructions assume that all civil engineering works concrete pad conduit etc have been finished and that the EpiSensor has been correctly con...

Page 20: ...r Determine which direction to orient the EpiSensor true north or aligned with structure True north is typical of most free field EpiSensor installations If the instrument is installed in a structure...

Page 21: ...stall the anchor stud Figure 2 Episensor mounting dimensions 8 minimum 8 minimum Wall Electrical connector EpiSensor orientation EpiSensor mounting hole EpiSensor orientation Note Follow all recommend...

Page 22: ...asier to hammer in the stud and prevent damage to the threads 4 Gently tap the top of the anchor stud with a hammer The stud is now in position but not firmly seated 5 Check that the leveling screws a...

Page 23: ...til the EpiSensor is level and the nut tightened to a torque of 20 26 inch pounds 2 26 2 94 N m As you tighten the nut the stud will move slightly forcing the locking cone to firmly grip the concrete...

Page 24: ...teel screw on the flange of the instrument as the case ground connection point To be effective this point must be connected to a low impedance earth ground Providing a low impedance earth ground can b...

Page 25: ...pper rods driven into the earth help to reduce the grounding resistance However the total ground resistance is not reduced in direct proportion to the number of rods in the array and the rods should b...

Page 26: ...r and recorder can be utilized Methods of Measuring the DC Offset If the EpiSensor is near the recorder you may zero the accelerometers by using the recorder as if it were a DVM If you are using an Al...

Page 27: ...mV 200 mV 100 mV 400 mV 1 2g 25 mV 100 mV 50 mV 200 mV 1g 25 mV 50 mV 25 mV 100 mV 2g 25 mV 25 mV 25 mV 50 mV 4g 25 mV 25 mV 25 mV 25 mV Note on Full Scale Range All of our full scale ranges are state...

Page 28: ...ible we have modified the packaging of the EpiSensor so the packaging can be re used as thermal insulation to provide protection against direct airflow and to increase the thermal insulation of the de...

Page 29: ...DOCUMENT 301900 REVISION D EPISENSOR USER GUIDE 13 Figure 5 Large Packaging Piece Installed Now install the cable as shown in Figure 6 below Figure 6 Cable Installed...

Page 30: ...hole This is shown in Figure 7 below Figure 7 Second Packaging Piece Installed over Connector Shell Finally the last piece of packaging can be placed over the connector and cable as shown below in Fi...

Page 31: ...SION D EPISENSOR USER GUIDE 15 Figure 8 Final Packaging Piece Installed Our testing has shown that this simple measure can significantly reduce the short term variations due to changes in air temperat...

Page 32: ......

Page 33: ...discusses EpiSensor operation Polarity conventions How to configure its operating modes Use of the calibration coil which allows verification of the sensor s transfer function Power supply options Po...

Page 34: ...he instrument Three access holes covered by seal screws through which the zero offset of the X Y and Z sensors may be adjusted Three adjustable leveling feet A connector for the analog output voltages...

Page 35: ...Kinemetrics website Figure 10 Display of functional test The height of the pulse will depend on the full scale setting of the instrument but will correspond to a g level of approximately 0 125g The e...

Page 36: ...1 1998 measures the response of the sensor to white noise input The digital to analog converter in the recorder drives the calibration coil with an analog voltage corresponding to a pseudo random numb...

Page 37: ...protect components from damage 1 Loosen the nut at the base of the connector without putting any torque on the connector itself 2 Remove the three large screws on top of the case 3 Remove the nut 5 R...

Page 38: ...zers or your fingers Additional jumpers are shipped with the EpiSensor to allow different configurations to be set If you need more jumpers they can be ordered from Kinemetrics as P N 851152 Setting t...

Page 39: ...1 25 V g 5 V g 2 5 V g 10 V g 4g 0 625 V g 2 5 V g 1 25 V g 5 V g Voltage values stated are as measured across each channel s output pins L M A B C D for axes X Y and Z respectively Pins L A and C ar...

Page 40: ...each connector pin in the figure below however only 1 will appear on the actual feedback board Figure 14 Full scale range jumper settings 1 3 5 7 2 4 6 8 Header X1 9 11 10 12 1 3 5 7 2 4 6 8 Header X4...

Page 41: ...rs and Connectors on Oscillator Board The following two figures show the location of all of the headers and connectors on the oscillator board used to configure the following options Figure 15 Top vie...

Page 42: ...axis For the 2 5V output install the jumper between pins 1 and 2 for the 10V output between pins 2 and 3 This output level refers to the voltage from the pin to ground Thus if you configure the unit...

Page 43: ...te When using the low noise amplifier be sure that jumpers are also installed across headers X21 and X22 to the power amplifier Refer to the table below to configure the amplifier Table 4 Amplifier co...

Page 44: ...xes X Y and Z Important Remove them to conserve power when using the low power option Table 5 Function of headers X21 and X22 Jumper Function X21 Connects 12V supply to X Y and Z axis low noise amplif...

Page 45: ...verify both the static acceleration sensitivity of the EpiSensor and the dynamic response of the system When used with Altus recorders the calibration signals are automatically applied to the sensor A...

Page 46: ...rents 5 mA for more than 20 seconds Caution If any signal source is to be connected to J4 J5 or J6 the corresponding headers X1 X2 and X3 described in the previous section must be removed or the senso...

Page 47: ...he three large seal screws through the cover and tighten to a torque of 18 20 inch pounds 2 26 2 94 N m 4 Re install the connector nut and tighten to a torque of 18 20 inch pounds 2 26 2 94 N m 5 Re i...

Page 48: ......

Page 49: ...e unit is operational and to keep as a baseline record for future visits Refer to Chapter 3 for instructions on performing the functional test If the unit is connected to an Altus or other Kinemetrics...

Page 50: ...ced New desiccant can be ordered from Kinemetrics as P N 700403 Be sure to follow electro static discharge ESD precautions when the sensor case is opened Instructions for opening and closing the EpiSe...

Page 51: ...ce accelerometers FBAs X axis Y axis and Z axis inside a sensor casing Each accelerometer module is identical and plugs into a board that provides the final output circuit and the carrier oscillator T...

Page 52: ...e capacitor plates back to their original null position The current traveling through the coil is thus directly proportional to the applied acceleration By passing this current through a complex imped...

Page 53: ...ith respect to ground A voltage signal applied to the calibration line with CCE is active will cause all three EpiSensor modules to respond with an acceleration output of approximately 0 05 g per volt...

Page 54: ...ion is corrected for the DC sensitivity of the sensor the amplitude agreement is within 0 5 dB over the bandwidth of the sensor The phase agreement is within 2 5 in the 0 100 Hz band and within 5 over...

Page 55: ...39 Figure 19 Amplitude phase and step response of the EpiSensor response model 0 50 100 150 200 10 8 6 4 2 0 2 Frequency Response Amplitude Frequency dB 0 50 100 150 200 180 160 140 120 100 80 60 40...

Page 56: ...ion seismology With Kinemetrics decision to adopt a positive polarity with the EpiSensor FBA it is now the standard in strong motion seismology as well Previous Kinemetrics FBA designs used an alterna...

Page 57: ...DOCUMENT 301900 REVISION D EPISENSOR USER GUIDE 41 Figure 20 X Y and Z coordinates Z AXIS VERTICAL X AXIS EAST WEST Y AXIS NORTH SOUTH UP...

Page 58: ...te the calibration coils of all three sensors Only active when calibration coil enable CCE is active A voltage of 2 5V will produce a nominal output equivalent to an input of 125g F CCE Input Calibrat...

Page 59: ...ow power configuration The Makalu formerly known as the Everest recorder can power EpiSensors in any configurations and can accept the 20V differential input Generally there is no reason to use the lo...

Page 60: ...levels If this is the configuration you wish to use we suggest using one of the following solutions Run only one of the EpiSensors on the low noise setting Contact Kinemetrics about modifying the ADC...

Page 61: ...this length we recommend installation in a grounded metal conduit If the cable is not installed in its own conduit and maximum resolution is required it should not be run alongside cables carrying hea...

Page 62: ...en configuration Table 9 EpiSensor cabling requirements 1 foot 0 3048 meters Sensor Type EpiSensor low power 2g 2 5V S E EpiSensor low noise 2g 5V differential EpiSensor low noise 2g 20V differential...

Page 63: ...d to a safety hazard if the location has poor AC wiring A hybrid ground connection can also be used 1 Ground the EpiSensor with the grounding strap 2 Open the connector at the EpiSensor end of the cab...

Page 64: ...readings and may damage the sensor If the voltage is too low the EpiSensor will not attain its full scale output and the data will be corrupted Never supply more than 15 75V to the unit and be sure th...

Page 65: ...the current required to balance the applied acceleration Add to this the output amplifier load for the output you have selected For a dual supply add this number to the quiescent current to get the w...

Page 66: ...the recorder cannot produce a functional test it is still very important that these lines be held at the correct potential The Cal line is not connected to the sensor unless the CCE line is active bu...

Page 67: ...d during normal operation severely degraded noise performance can result Applying voltage to the Cal line when the unit is not powered will result in damage Applying voltage above the power supply lin...

Page 68: ...This section provides instructions for assembling an EpiSensor to Altus recorder cable based on a Belden cable P N 840356 The instructions assume the cable has already been pulled and routed through...

Page 69: ...MI P N Commercial P N Description of Item s Mating connector 851119 851 06EC14 19PN50 1 connector Foil tape 880699 1183 3 8 wide 6 pieces 3 8 x 1 Foil tape 880699 1183 3 8 wide 1 piece 3 8 x 3 Foil ta...

Page 70: ...ke tape that is approximately 3 8 wide as follows 1 Divide one of the 1 x 3 pieces into thirds the long way as shown in the middle grouping in Figure 23 so you have three 3 long pieces 2 Divide two of...

Page 71: ...der cable end Part Name KMI P N Thermofit tubing 851186 Connector strain relief grommet Part of 851119 Connector back shell Part of 851119 Shrink n Shield tubing 850839 Connector s plastic grommet rin...

Page 72: ...pe cord as shown in Figure 24 Figure 24 Recorder cable end with outer PVC jacket removed 4 Cut off and discard the center rope cellophane and white string Cut them back as near as possible to the new...

Page 73: ...eld Make sure your wrapping flows in the same spiraling direction as the shield you are wrapping it around Wrap all six foil shields identically 5 Bring all the drain wires together and twist them tog...

Page 74: ...connection 10 Apply 1 4 diameter by 1 4 long shrink tubing over the soldered area of the drain wires and black wire as shown in Figure 29 The cable is now ready for 3 8 x 3 foil tape wrapping 1 Tight...

Page 75: ...airs of wires into the grommet Use the schematic in Figure 30 to find the proper wire to solder cup locations Be sure to follow the proper half of the schematic below depending on whether you are curr...

Page 76: ...the wires into the connector Note When cool the soldered joints should have a smooth shiny surface Use enough solder to just fill the connector cup 2 When done with the soldering slide the grommet and...

Page 77: ...inking Using even heat shrink the tubing until it is tightly in place over the foil tape as shown in Figure 35 and begin the final assembly process 1 Slide the connector shell forward and screw tighte...

Page 78: ...off 1 8 of insulation from all of the insulated wires 5 Make sure to position each wire so that its exposed surface has no contact with any other wire Now using the DVM test the connection of the cond...

Page 79: ...ductors have passed the four test steps above Once you ve completed testing all the pairs of insulated conductors test the connection of the wire shields to the recorder end of the connector shell 1 A...

Page 80: ...ble 14 Parts for EpiSensor end mating connector assembly Part Name KMI P N Commercial P N Description Right angle mating connector 851370 851 08EC14 19 1 connector Foil tape 880699 1183 3 8 wide 6 pie...

Page 81: ...d have 6 pieces approx 3 8 x 1 and 1 piece approx 1 4 x 3 Figure 38 Preparing 3 8 wide foil tape from 1 foil tape To assemble the EpiSensor end mating connector Gather the parts listed in Table 15 and...

Page 82: ...Wire 3 1 Insert wires through grommet in appropriate letter location using the EpiSensor end of the schematic in Figure 30 2 Cut 3 2 lengths of the 22 gauge stranded wire and strip about 1 4 of insula...

Page 83: ...into grommet pins as indicated in Figure 30 Be sure to follow the EpiSensor end of the schematic drawing To solder the wires into the EpiSensor connector 1 Start at the bottom and work toward the top...

Page 84: ...l tape Figure 41 Wrapping foil tape around outside of the connection Figure 42 Cable with Shrink n Shield tubing outer tubing trimmed back to show screen mesh Slide the Shrink n Shield tubing up over...

Page 85: ...toward the connector 2 Tighten the backshell onto connector 3 Bend cable back into the connector backshell 4 Slide the cable strain relief grommet over the Shrink n Shield into cable clamp position 5...

Page 86: ...nnector pin L to connector pin M 4 Now the DVM at the EpiSensor end should show that pin L is connected to pin M the DVM should measure 2 5 per 100 of cable If it does have the other technician remove...

Page 87: ...end should show that pin L is now connected to the recorder end connector shell and to pin U The DVM should measure 1 5 per 100 of cable If it does have the technician remove the test jumper at the re...

Page 88: ......

Page 89: ...ntial Linearity 1000 g g2 Hysteresis 0 1 of full scale Cross axis sensitivity 1 including misalignment Zero point thermal drift 2 of full scale 200 to 700 C Zero point drift 500 g 0 C ESD RF EMI prote...

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