Strong Motion Accelerometer User`s Manual
Contents
1. A Z Acceleration B Z Acceleration C Shield Connection Connected to ANALOG Ground D Y Acceleration E Y Acceleration F Shield Connection Connected to ANALOG Ground G X Acceleration H X Acceleration J Shield Connection Connected to ANALOG Ground K Z Channel Range Indicator L Y Channel Range Indicator M X Channel Range Indicator N ANALOG Ground P CAL Enable Line Logic Level R AUTOZERO Enable Line Logic Level S RESET Enable Line Logic Level T RANGE Enable Line Logic Level U Enable Return Vv CAL Input W CAL Input X RS 232 TX Page 5 of 26 EpiSensor2 User s Manual June 2015 Y RS 232 RX Z RS 232 GND a Power Bundle Shield CASE Ground b Input Power 9 36V c Input Power Return Table 1 Connections to sensor through Souriau 851 07C16 26P50 A7 44 receptacle Note that the shield connections pins C F and J are provided for redundancy in specially designed cables Within the standard sensor cabling these connections are not propagated into the cables at the sensor end Rather the shield connections are made only at the digitizer end of the cable The digital enable lines P R S T relative to U are fully isolated from other lines in the system They operate over an approximate 2V to 10V input range The RS 232 interface on pins X Y and Z is fully isolated as well The power inputs pins b and c require voltage ra2. Wire 1 Pair 9 Enable Return U Wire 1 Pair 9 CB CB White White Wire 1 Pair CAL Input Vv Wire 1 Pair 10 CB 10 CB Black Black Wire 2 Pair CAL Input W Wire 2 Pair 10 CB 10 CB Brown Brown Wire 1 Pair RS 232 TX X NC Triad Red 11 CB Wire Black Wire 2 Pair RS 232 RX Y NC Triad Black 11 CB Red Wire Wire 2 Pair 9 RS 232 GND Z NC Triad White CB Gray Wire 1M to Power Bundle a Power Bundle Shield Power Shield CASE Ground Drain Wire Bundle Shield Drain Wire Wire 1 Pair Input Power b Wire 1 Pair 12 PB 12 PB 9 36V Black Black Wire 2 Pair Input Power Return c Wire 2 Pair 12 PB 12 PB Orange Orange Triad Shield Drain Wire NC NC Table 2 Connection details of standard 6 meter cable EpiSensor2 User s Manual June 2015 Operational Control of the EpiSensor2 The sensor can be controlled in multiple ways button pushing local digitizer enable lines remote and RS 232 local and or remote Using either of these the operator can control the full scale range and AUTOZERO state of the sensor Using the digitizer or RS 232 interfaces the user can exercise a complete calibration CAL capability Using a dedicated digital line connected to the digitizer the operator can issue a RESET to the sensor that is similar to a Power ON RESET Finally the user can use the RS 232 interface to communicate with the sensor to receive a variety of sens
3. enable12345 to allow access to command menus 2 Type OPERATE to select OPERATE page 3 At the OPERATE prompt type command to select range 1 AUTOZEROON turns ON Autozero 2 AUTOZEROOFF turns OFF Autozero Page 13 of 26 EpiSensor2 User s Manual June 2015 CAL Calibration The EpiSensor2 allows the injection of external calibration signals into the sensors All three axes are excited simultaneously There is a green LED that is lit when CAL is ENABLED There are two ways to control the CAL state 0330 Enable Lines Q330 used for this description The sensor monitors Q330 CAL ENABLE line 2 Asserting the line enables CAL Signals presented at the CAL input pins of the connector will be injected into the calibration circuit of the sensor 3 De asserting the line disables CAL 4 The sensor operates seamlessly with the standard Start Stop Sensor Calibration commands in the Q330 control software Willard RS 232 Command Line Interface 1 At the MAIN prompt enter enable12345 to allow access to command menus 2 Type OPERATE to select OPERATE page 3 At the OPERATE prompt type command to select range 1 CALON enables CAL 2 CALOFF disables CAL RESET Asserting the Q330 Generic Enable 2 AUX 1 line rests the sensor It effect is equivalent to a Power ON RESET POR event without interrupting the power Page 14 of 26 EpiSensor2 User s Manual June 2015 Setup and Initial
4. provides a convenient connection Souriau to DB9 that supports this interface A standard terminal emulator program such as PuTTY can be used to communicate with sensor Note that the emulator should be set so that Control H represents the backspace key This will allow the sensor to respond properly to backspaces entered by users in the terminal After power ON the sensor will output sensor specific information and will leave the user at the Main page prompt The commands are not case sensitive All keyboard commands are completed by hitting the Enter key On any page the character will list the specific commands available on any page Page 19 of 26 EpiSensor2 User s Manual June 2015 Main Page Commands Epi2 0 Main Menu MAIN gt Commands OPERATE Selects Sensor Control Menu RESPONSE Selects RESPONSE Menu SAFE Disables Sensor System Control ENABLE HHHH Enables Sensor System Control is Password STATUS Print System Status Info Help For Info on specific Command Seconds 4179 Ticks 42 Epi2 0 Main Menu MAIN gt The status command prompts the system to print out a set of system related data Epi2 0 Main Menu MAIN gt status Kinemetrics Episensor2 0 Serial Number 106 Episensor2 0 Connector Board Number 4035 Episensor2 0 Main Board Number 2014 Episensor2 0 Top Board Number 3012 Episensor2 0 MSP430 Code Revision 3 02 00 X Sensor Module Serial Number Number 2006 Y Sensor Module Serial Numbe
5. at 0 5g Asserting the line for between 0 5 and 1 5 seconds places the sensor range at 0 25 ieee ho Page 11 of 26 EpiSensor2 User s Manual June 2015 RS 232 Command Line Interface 1 At the MAIN prompt enter enable12345 to allow access to command menus 2 Type OPERATE to select OPERATE page 3 At the OPERATE prompt type command to select range 1 4g for 4g 2g for 2g 1g for 1g 0 5g for 0 5g 0 25g for 0 25g Piao tS Range Signaling The EpiSensor2 feeds a range dependent signal into the the low resolution mass position channels of the Q330 or Rock digitizers 5V 50 counts for 4g range AV 40 counts for 2g range 3V 30 counts for 1g range 2V 20 counts for 0 5g range 1V 10 counts for 0 25g range In addition the Episensor2 outputs a coded range signal to each of the channels SIGNAL line 5 pulses for 4g range 4 pulses for 2g range 3 pulses for 1g range 2 pulses for 0 5g range 1 pulse for 0 25g range This signal is output at power ON following a RESET event and following any range setting activity Typical pulses for 4g range are shown in Figure 4 gt v gt F 1534 QuickView Seg x Channels to Display d a M Ch M Ch2 Cha M Chh M ChS M ChG e 4 Channel 1 RMSmV 113 87803 AVGmiv 28 6 WIN 1 9860800 7 Channel 2 RMSmv 113 92287 AVGmV 2
6. power for the sensor is generally expected to come from the digitizer via pins b and c The connections within the standard cable PN Epi2 0 320001 6 are listed in Table 2 For users wishing to create their own cables Kinemetrics can supply a standard right angle solder cup plug with cable clamp that will connect directly to the EpiSensor2 The commercial part number for this item is Souriau 851 08EC16 26S50 44 This plug and the connection details in Table 1 are all that users will need to make connection to the sensor Please contact Kinemetrics to discuss specific cable requirements Page 7 of 26 EpiSensor2 User s Manual June 2015 DIGITIZER PLUG 16 SHELL SOURIAU RS 232 PLUG 10 SHELL SOURIAU Epi2 0 320001 6 STANDARD VAULT CABLE 6 METER LENGTH Figure 2 Sensor with standard cable Epi2 0 320002 1 5 a j l j i RS 232 CABLE Li CONNECTED TO STANDARD CABLE PLUG Figure 3 Standard cable with RS 232 cable connected Page 8 of 26 EpiSensor2 User s Manual June 2015 Inbound Outbound Outbound End End End Sensor Recorder RS 232 Connector Connector Connector 851 08E16 Conductors Signal 851 06E16 Conductors 851 06E10 Conductors 26850 44 RA 26P50 44 98S50 44 Plug Plug Plug A Wire 1 Pair 1 Z Acceleration A Wire 1 Pair 1 SB SB White White B Wire 2 Pair 1 Z Acceleration B Wire 2 Pa
7. provides a broad set of electronically controlled operational modes including range switching allowing 4g 2g 1g 0 5g and 0 25g peak full scale ranges Offset removal AUTOZERO mode and calibration These modes can be controlled remotely either via the digitizer using selected enable lines or via an RS 232 command line interface The sensor also provides a pushbutton switch for local control This allows an on site user to select sensor full scale range and AUTOZERO state ON or OFF An important feature of the EpiSensor2 is its very low quiescent power consumption under 350 mW The sensor consumes 60 to 70 lower power than competing strong motion accelerometers This makes it ideal for remote battery powered applications The EpiSensor2 and its cabling are designed for direct connection to Quanterra Q330 series digitizers as well as digitizers from the Kinemetrics Rock series The EpiSensor2 module and some of its features are shown in Figure 1 PUSHBUTTON SWITCH KEK KINEMETRICS AUTOZERO LED i E EpiSensor2 LEVEL INPUT CONNECTOR Figure 1 EpiSensor2 module Page 4 of 26 EpiSensor2 User s Manual June 2015 Electrical Connections The EpiSensor2 contains a Souriau connector on its side The connections supported by this receptacle are shown in Table 1 851 07C16 26P50 A7 44 Receptacle Pin Designator Signal Notes
8. system records and corrects the sensor offsets in situ This correction cancels fixed mechanical offsets in the sensor element as well as tilt related offsets due to sensor mounting It injects a separate feedback current that is automatically generated to cancel the observed offset AUTOZERO is either OFF standard mode or ON Any time that the sensor is RESET or it experiences a Power ON RESET or the AUTOZERO is explicitly set via the various control interfaces the sensor re calculates and corrects its offsets When continuously powered the sensor retains the same offset removal current setting AUTOZERO requires higher quiescent power consumption about 120 mW extra and it increases self noise levels Unless the user has special requirements e g using a very low dynamic range digitizer requiring the use of input preamplifiers we recommend leaving the AUTOZERO in its OFF state Any modern digitizer as well as many data analysis algorithms are not affected by DC offsets in the signals or in the digital data Calibration CAL Calibration is seamlessly supported through the digitizer connection This includes a digital control line for connecting the differential calibration input signals to the sensor elements and use of the voltage sources provided by the digitizer For the EpiSensor2 with DC 320 Hz bandwidth random noise is an excellent calibration stimulus source Retention of Settings The current full scale range and AUT
9. wide 9 36V input supply range The quiescent power consumption input power in the absence of significant seismic signals with all LED indicators OFF and with the RS 232 interface disconnected is under 350 mW Typically the current draw is 25 to 28 mA 12V Power consumption is temporarily higher when LEDs are illuminated Also a persistent RS 232 connection increases power consumption by 10 to 20 mW Dynamic signals increase instantaneous power consumption A typical rule of thumb is that for every lg increase in input signal per axis power consumption increases by about 150 mW At the absolute highest drive levels 4g simultaneously on each of the three axes unheard of from natural seismic sources this excess power consumption would amount to about 1 8W Naturally dynamic signals impose lower mean energy demands Also exact temporal correlation between signals on the three axes is very unlikely The absolute maximum dynamic input power is almost certainly lower than 1 8W As such the maximum input power requirements quiescent plus dynamic is expected to be under 2W As such a low impedance 2W power supply is sufficient for the EpiSensor2 Like most analog sensor products the power input has a moderate level of input capacitance a few Page 17 of 26 EpiSensor2 User s Manual June 2015 tens of microfarads Any competent power source should be able to provide the instantaneous inrush currents a few amps over a few tens of micr
10. 5 Details of leveling feet Page 15 of 26 EpiSensor2 User s Manual June 2015 Operational Details Choice of Digitizer The instantaneous dynamic range of the sensor is greater than that of any modern seismic digitizer particularly when operating on the 4g and 2g ranges 26 bit digitizers such as the Q330HR are preferred for utilizing the greatest part of this range More conventional 24 bit digitizers also work well however the self noise of a properly installed sensor is well below that of the input noise of the digitizer Some digitizers provide integrated preamplifiers While these are useful for investigation of the exact levels of sensor self noise their use will greatly reduce the full scale range of the sensor This effectively defeats the purpose of a strong motion accelerometer Typically the best system performance will be achieved by use of a Q330HR 26 bit digitizer with its preamplifiers OFF Full Scale Range Selection Sensor dynamic range is typically highest on the highest full scale range settings 4g and 2g where the 1 Hz dynamic range is in excess of 160 dB However sensor self noise typically drops with range setting although noise on 0 5g and 0 25g ranges are practically identical The choice of peak full scale range should ensure that there is near zero chance of clipping due to maximum local accelerations Users should select ranges above the maximum expected signal AUTOZERO Mode The AUTOZERO
11. 8 8 WIN 19660800 Channel 3 RMSmi 113 41725 AVGmiV 29 0 WIN 19660800 Duration Fl cose 10 Seconds of data G H F C 30s C 60s C 120s Figure 4 Pulse train range signal for 4 g range Page 12 of 26 EpiSensor2 User s Manual June 2015 AUTOZERO The EpiSensor2 has an autozero capability that will remove DC offsets from the signal up to an acceleration equivalent limit of 100 mg Autozero operates simultaneously on all three channels There are only two modes ON and OFF The current state is stored in non volatile memory The sensor will enter the appropriate state after a POR event There are three ways to control the autozero state Button Pushing 1 Press the button once for about 1 second 0 2 to 2 second acceptable window This will light the LEDs and enable the system 2 Push and hold the button for between 5 and 10 seconds to toggle the AUTOZERO ON OFF A green LED will be lit when AUTOZERO is ON 3 After 20 seconds of inactivity the LEDs will shut off and the system will be disabled 0330 Enable Lines Q330 used for this description 1 The sensor monitors Q330 Generic Enable line 1 2 Apulse length encoding scheme is used to set the AUTOZERO state 1 Asserting the line for between 1 and 3 seconds 2 seconds nominal turns AUTOZERO ON 2 Asserting the line for between 4 and 6 seconds 5 seconds nominal turns AUTOZERO OFF RS 232 Command Line Interface 1 At the MAIN prompt enter
12. Kinemetrics EpiSensor2 Strong Motion Accelerometer User s Manual Revision 2 01 June 2015 KINEMETRICS Kinemetrics Inc Pasadena CA USA www kinemetrics com Page 1 of 26 EpiSensor2 User s Manual June 2015 Table of Contents No User Serviced Parts Electrical Safety Notice cccssccsssscssssscsssscssssscssssscssssessssree Age 3 Introduction and Product Description cccscccsssccssssscssssccscscscssssesscsssssssssscsssssssrrree PAZE 4 Electrical ComnecriOnsssceccascavcstonvacesavasconeusdsuenseonsssvonsusnduensasuvsstentsserectisosuadesuscosedeassonatsccrenael ALES 5 6 EpiSensor2 Cabling cascccciscssictcecacsecascsssunaioiensesecssseucveseueasscdsdsteretaversssesiuanvenssseonssssonsetmatecsssl ALES 7 10 Operational Control of the EpiSensor2 essesssoeessosssosssocssocsssosesoosesoessoesssesssossssesessssss gt ages 11 14 Setup and Initial Oper atiOnscccss sccssiccosscsacssecsescecessseoneaddocssecassevoessesceedsovensascdeseoeassdoesaeveesl ALE 15 Operational Details ccaiccssvicssaseccssdanationsnstensdsacavssnsueceusedasssuinsuotacoseavaseonstoecenotavetsoonepsieeiscounesl AES 106 18 RS 232 Command Line InterfaCce soeessoessoesssesssosssocssoosssossssesesosesoessoosesoesssesssessssessssse PAgeEs 19 22 Shipping and Handling ssssssissssgsssssssissssssosssossssrsssosessesssassosno osaset soassa ALC 2S Contact Kinemetrics e ssoessoesssosssosesoessoosesoessoosssoessoesssosssoesssosssoesso
13. OZERO status ON or OFF is stored in EEPROM within the Page 16 of 26 EpiSensor2 User s Manual June 2015 sensor These settings are updated whenever the status is changed by the user or the digitizer Upon a system Power ON RESET or simple RESET the sensor is restored to the the stored operating configuration The calibration status however is volatile Following any RESET event the calibration mode must be re entered using either the digitizer enable line or an RS 232 command Sensor Response Values Each sensor element is trimmed during manufacture to provide a standard scalar response Volts g on each of the five operating ranges In addition each sensor axis is trimmed to ensure that its response bandwidth falls within a set range 3 dB amplitude point at or above 320 Hz The scalar responsivity G is stored on the RESPONSE page that is described below A command query on this page status command will return the scalar response values for each element at the current full scale range setting The Episensor2 frequency response can be described well by a simple set of conjugate pole pairs P1 700 1250j radians second P2 1340 3350j radians second The full response is defined as V G_ P1 P2 s P1 s P1 s P2 s P2 where G is the scalar responsivity Volts Standard g A standard g is defined as 9 81 m sec Input Power Requirements The EpiSensor2 operates from a
14. Operation The EpiSensor2 should be deployed on a firm stable surface The sensitive horizontal directions X and Y are aligned with the sides of the sensor The sensor should be leveled using the threaded adjustment feet and the bubble level One of these feet is shown in Figure 5 Following leveling the feet can be locked by tightening the lock nut up against the bottom of the sensor finger tight only The central bolt hole can be used to anchor the sensor to the mounting surface This can use bolts and a threaded insert in the surface or a threaded stud that passes up from the surface to be captured with a nut at the top of the sensor Connect the sensor cable to the sensor and to the digitizer Q330 series or Rock series The sensor will power ON over the course of a few seconds The current range setting and current AUTOZERO status ON or OFF will be signified by the LEDs Wait until the LED extinguishes about 20 seconds Pressing the LED once for between 0 2 and 2 seconds will re illuminate the LED It will also activate the button system for further control as discussed previously Upon power ON or a RESET event the sensor will output an analog signal on its range indicator lines These will be recorded by the digitizer The user can verify the current range setting by monitoring these values or by analyzing the pulse train sequence shown in Figure 4 At this point the sensor is operational LOCKING NUT Figure
15. dicated isolated lines for control of full scale range CAL ENABLE and AUTOZERO ON OFF RS 232 Interface TIA EIA 232 F compliant isolated RS 232 with full command line control of all sensor parameters and functions Page 24 of 26 EpiSensor2 User s Manual June 2015 Pushbutton Switch and Status LEDs Local selection and display of full scale range AUTOZERO and CAL status Full Scale Range Remote Signaling Mass Position Interface Range dependent voltage output on traditional broadband sensor mass position lines Signal Line Interface Time Amplitude coded pulse train superimposed on differential signal lines signaled upon full scale range change or upon power ON reset Electrical Interface Connector Souriau 851 07C16 26P50 A7 44 Receptacle Acceleration Output Up to 40 Vpp differential Output Impedance Under 2 x 100 Ohms Calibration Input Protected differential input for exciting all three axes simultaneously 15V Peak acceleration equivalent stimulus Cable Right angle molded plug connects to sensor Inbound end connects directly to Q330 class digitizers Y plug for RS 232 interface Physical and Environmental Housing Epoxie painted Ni plated Aluminum scratch and crack resistant Leveling Integrated bubble level and fine pitch adjustable leveling screws Mounting Single central bolthole passing through sensor non interfering with leveling Size 5 0 L x 5 25 w X 3 25 H 12 7 cm x 13 3 cm x 8 3 cm Weight 4 Po
16. eessoesssesssssssssssssssssessse PAZE 23 EpiSensor2 SpecificationS e sesessesssoessoesssosssosesoesssoessoesssosssoessoesssosssoesssessssessossssoesssessse PAZES 24 26 Page 2 of 26 EpiSensor2 User s Manual June 2015 No User Serviced Parts The EpiSensor2 is a self contained seismic accelerometer There is no reason to open the sensor package or to modify the electronics or sensor elements contained within it There are no internal manual adjustments to make nor are there any user serviced parts within the sensor Opening and or modifying the sensor is unnecessary and doing so will void the instrument s warranty Electrical Safety Notice As with all electrical instruments potentially lethal potentials can be present on all metal surfaces including conductors within any cables Proper grounding of these elements is important to minimize these risks The user of this product is responsible for its installation and operation in a safe manner and in accordance with all local requirements for electrical safety Page 3 of 26 EpiSensor2 User s Manual June 2015 Introduction and Product Description The EpiSensor2 is an advanced force balance triaxial accelerometer that builds upon the outstanding record of its predecessor the EpiSensor the world s first seismological grade strong motion accelerometer The high dynamic range of the EpiSensor2 allows both weak and strong motion recording from a single sensor The EpiSensor2
17. ent and transport Contact Kinemetrics Please contact Kinemetrics with any questions or issues regarding this product 1 626 795 2220 Phone support kmi com www kinemetrics com Page 23 of 26 EpiSensor2 User s Manual June 2015 EpiSensor2 Specifications Architecture Triaxial force balance accelerometer with capacitive displacement transducer X Y Z non Galperin configuration Centering Optional AUTOZERO mode to allow removal of static sensor offsets zeroed to within 0 005 g Full scale Range Electronically and remotely selectable range 4 g 2 g 1 g 0 5 g and 0 25 g peak Bandwidth DC to gt 320 Hz 3 dB point Dynamic Range Integrated RMS 166 dB 1 Hz over 1 Hz bandwidth 155 dB 3 to 30 Hz Non linearity lt 0 015 total non linearity Hysteresis lt 0 005 of full scale Cross axis Sensitivity lt 0 5 total Offset Temperature Coefficient Horizontal sensor 60 ug C typical Vertical sensor 320 ug C typical Power Supply Voltage 9 to 36 V DC isolated input Power Consumption lt 350 mW typical quiescent Power Protection Reverse voltage and over under voltage protected Over current protection with self resetting feature Isolation Input power serial interface and digital control lines galvanically isolated from sensor ground Grounding Case ground connected to dedicated cable line for automatic connection to digitizer grounding lug Control Interfaces Digital ENABLE Lines De
18. ir 1 SB SB Black Black C NC Signal Bundle Shield C Signal Bundle Shield Drain Wire D Wire 1 Pair 2 Y Acceleration D Wire 1 Pair 2 SB SB White White E Wire 2 Pair 2 Y Acceleration E Wire 2 Pair 2 SB SB Brown Brown F NC Control Bundle F Control Bundle Shield Shield Drain Wire G Wire 1 Pair 3 X Acceleration G Wire 1 Pair 3 SB SB White White H Wire 2 Pair 3 X Acceleration H Wire 2 Pair 3 SB SB Red Red J NC J NC K Wire 1 Pair 5 Z Channel Range K Wire 1 Pair 5 CB CB White Indicator White L Wire 2 Pair 5 Y Channel Range L Wire 2 Pair 5 CB CB Yellow Indicator Yellow M Wire 1 Pair 6 X Channel Range M Wire 1 Pair 6 CB CB White Indicator White NC wire Wire 2 Pair 6 NC wire Wire 2 Pair 6 CB floats CB Green floats Green N Wire 1 Pair 4 ANALOG Ground N Wire 1 Pair 4 SB SB White White NC wire Wire 2 Pair 4 NC wire Wire 2 Pair 4 SB floats SB Orange floats Orange P Wire 1 Pair 7 CAL Enable Line P Wire 1 Pair 7 CB CB White Logic Level White R Wire 2 Pair 7 AUTOZERO Enable R Wire 2 Pair 7 CB CB Blue Line Blue Logic Level Page 9 of 26 EpiSensor2 User s Manual June 2015 Wire 1 Pair 8 RESET Enable Line S Wire 1 Pair 8 CB CB White Logic Level White Wire 2 Pair 8 RANGE Enable Line T Wire 2 Pair 8 CB CB Violet Logic Level Violet
19. nfo on specific command Seconds 4421 Ticks 222 Epi2 0 Response Menu RESPONSE gt The status command prompts the system to print out a set of system related data Epi2 0 Response Menu RESPONSE gt status Sensor FS Range is 4g X Sensor Module Scale Factor is 5001 mV per Standard g Y Sensor Module Scale Factor is 4998 mV per Standard g Z Sensor Module Scale Factor is 4999 mV per Standard g AUTOZERO is OFF CAL is OFF Seconds 4447 Ticks 789 Epi2 0 Response Menu RESPONSE gt Activity Timeout and Disable Once enabled the sensor will automatically be disabled after 3600 seconds of inactivity no commands entered or on a RESET or POWER ON RESET event When disabled the sensor is returned to the Main Page The user would then need to re enable the system to access other pages System control is also disabled with a safe command entered on any page Seconds and Ticks The sensor measures and reports elapsed time since its last RESET or Power ON RESET event Seconds are the number of elapsed seconds Ticks are a sub second measure approximately equal to 1 msec Page 22 of 26 EpiSensor2 User s Manual June 2015 Shipping and Handling While it is called a strong motion accelerometer the EpiSensor2 is still a precision instrument that should be handled with care Avoid strong shocks during shipment and installation It is recommended that customers utilize the original foam filled packaging during any shipm
20. nge of 9 36V at the sensor input This galvanically isolated input has reverse polarity protection as well as overcurrent protection The ANALOG ground line Pin N is the common mode voltage reference for the differential signal lines pins A B D E and G H It also serves as the reference ground for the range voltage signals pins K L and M The calibration CAL input pins V and W is differential with a 15V range The common mode reference for these signals is ANALOG ground pin N Page 6 of 26 EpiSensor2 User s Manual June 2015 EpiSensor2 Cabling The standard cable for the EpiSensor2 is shown in Figure 2 This 6 meter long cable PN Epi2 0 320001 6 connects to the sensor and to the digitizer The 10 shell plug in the Y extension at the digitizer end is dedicated to the isolated RS 232 connection Kinemetrics can also supply a simple RS 232 connection cable PN Epi2 0 320002 1 5 It connects as shown in Figure 3 to the 10 shell plug Among other cable options are ones without the RS 232 takeout This can be used when RS 232 control is not desired or when the cable run is beyond the practical limit of RS 232 communications typically 15 meters Kinemetrics can also supply pigtailed connectorless cables The maximum cable length is 125 meters owing to limitations related to digitizer power sourcing mainly its voltage and series resistance in the power lines contained within the cabling Operating
21. or specific information serial numbers scalar response values etc The RS 232 command line menu is discussed further below Full Scale Ranges The EpiSensor2 supports five digitally selectable ranges with nominal scale factors Range 5 4g 5 V g Range 4 2g 10 V g Range 3 1g 20 V g Range 2 0 5g 40 V g Range 1 0 25g 80 V g There are red LEDs that show the current range This range is stored in non volatile memory The sensor range will be maintained upon a power on reset POR event There are three methods for setting the range Button Pushing 1 Press the button once for about 1 second 0 2 to 2 second acceptable window This will light the LEDs and enable the system 2 Each subsequent button push changes the range by one step in a cyclical fashion Wait about 5 seconds between subsequent pushes 3 After 20 seconds of inactivity the LEDs will shut off and the system will be disabled Digitizer Enable Lines Q330 used for this description 1 The sensor monitors the Q330 s Generic Enable line 3 AUX 2 2 Apulse length encoding scheme is used to select the range 1 Asserting the line for between 4 5 and 5 5 seconds places the sensor range at 4g Asserting the line for between 3 5 and 4 5 seconds places the sensor range at 2g Asserting the line for between 2 5 and 3 5 seconds places the sensor range at 1g Asserting the line for between 1 5 and 2 5 seconds places the sensor range
22. oseconds required to charge these capacitors Battery power is ideal Also the EpiSensor2 has been fully tested using the integral sensor power supplies provided by the Quanterra Q330 series and Kinemetrics Rock series digitizers Although the sensor electronics employ multiple stages of power supply noise rejection it is always best to use clean well regulated input power Thermal Isolation In order to generate the highest quality data with low noise and drift at low frequency the EpiSensor2 should be operated in an environment with high thermal stability At a minimum the sensor should be covered with a foam box in order to reduce the effects of air flow around it Higher levels of thermal isolation can be achieved by increasing the effective thermal mass of the instrument Among the options for this are sand packing and the use of interlocking water bricks Please contact Kinemetrics to discuss the technical details related to increasing thermal isolation Page 18 of 26 EpiSensor2 User s Manual June 2015 RS 232 Command Line Interface The sensor provides an isolated RS 232 interface operating in a very standard mode 9600 baud 8 data bits 1 start bit No parity The interface does not support hardware or software handshaking Connection within a typical DB9 COM connector is DB9 Pin RS 232 Line Description Souriau Plug Contact 2 Tx A 3 Rx B 5 GND C The RS 232 cable PN Epi2 0 320002 1 5
23. r Number 2056 Z Sensor Module Serial Number Number 1010 Sensor FS Range is 4g AUTOZERO is OFF CAL is OFF Seconds 4237 Ticks 1002 Epi2 0 Main Menu MAIN gt Password Protection The system must be enabled to allow access to other menus The enable command is enable12345 Page 20 of 26 EpiSensor2 User s Manual June 2015 Operate Page Commands Epi2 0 Operate Menu OPERATE gt Commands 4G Sets Sensors to 4g FS Range 2G Sets Sensors to 2g FS Range 1G Sets Sensors to 1g FS Range 0 5G Sets Sensors to 0 5g FS Range 0 25G Sets Sensors to 0 25g FS Range AUTOZEROON Turns ON Autozero Mode AUTOZEROOFF Turns OFF Autozero Mode CALON Enables Sensor CAL CALOFF Disables Sensor CAL STATUS Prints Sensor Operating Mode Values SAFE Disables Sensor System Control RETURN Return to Previous Menu Help for info on specific command Seconds 4302 Ticks 369 Epi2 0 Operate Menu OPERATE gt The status command prompts the system to print out a set of system related data Epi2 0 Operate Menu OPERATE gt status Sensor FS Range is 4g AUTOZERO is OFF CAL is OFF Seconds 4364 Ticks 36 Epi2 0 Operate Menu OPERATE gt Page 21 of 26 EpiSensor2 User s Manual June 2015 Response Page Commands Epi2 0 Response Menu RESPONSE gt Commands SCALE Shows Scale Factor for Each Range and Axis STATUS Prints Current Sensor Response Values SAFE Disables Sensor System Control RETURN Return to Previous Menu Help for i
24. unds Operating Temperature 40 C to 60 C Storage Temperature 65 C to 75 C Humidity 0 to 100 Weather Resistance O ring sealed to IP 67 Page 25 of 26 EpiSensor2 User s Manual June 2015 RS 232 Remote Commands password protected access Full scale range setting Calibration ENABLE AUTOZERO ON OFF System Response Values System Information Serial Numbers Hardware and Firmware Revisions Page 26 of 26 EpiSensor2 User s Manual June 2015
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