Operation Manual for - Bartington Instruments
Contents
1. 4 omm ond Gerd Mimi 1 PSU Voltage P0 22 In 0 5V Digital Select PSU Monitor P0 21 In 0 5V Digital Enable s wem few PSU Monitor P0 17 In 0 5V Digital Select 1 11 PSU Monitor P0 16 In 0 5V Digital Select 0 Page 28 of 47 OM2201 5 BARTINGTON INSTRUMENTS u BiatalGound sm ia isaisa Grad Momm w Wocomecion aw ris DgteGend DG Ground Test Relay P0 14 0 5V Digital Enable Ground OV Nominal 12 13 14 15 In In 19 P0 12 0 5 Digital 20 APFI 1 APFI 1 In 0 5V Digital 21 In 22 In 23 24 25 Analogue Input 10V Analogue 3 PSU Monitor Out Al 31 10V Analogue t 4 Analogue Output Al Gnd Ground OV Nominal Ground Sensor 8 X Al 22 Ou 10V Analogue Output 26 Sensor 10 Y Al 29 Out 10V Analogue Output 27 Analogue Output Al Gnd Ground OV Nominal Ground 28 Sensor 7 Y Al 20 Out 10V Analogue Output 29 Analogue Output Al Gnd Ground OV Nominal Ground 30 Sensor 7 X Al 19 Out 10V Analogue Output 31 Sensor 9 Y Al 26 Out 10V Analogue Output Ground Output Output Page 29 of 47 OM2201 5 BARTINGTON INSTRUMENTS input Select Po24 Digital 38 Sensor PSU P0 23 0 5V Digital Enable Filter Select 0 5V Digital Filter enable P0 29 0 5V Digital 41 PSU Monitor P0 20 In 0 5V Digital Select 4 42 In PSU Monitor 0 5V Digital Select 3 Select 2 Sensor Test 8 P0 10 0 5V Digita2. Load dd Trigger Source IPXI1Slot2 PFIO Trigger Edge J Off Trigger Voltage J 3 Data Process Filter Filter Type Filter Low cutoff 100 Filter High cutoff 300 Filter Order FFT Parameters FFT window jJ None number of averages Jo averaging mode jJ Mo Immediately after starting the software or when the Load button is clicked a File Select box is displayed Figure 7 to allow the user to select a pre saved configuration cfg file Select a file if desired or select Cancel to retain the current configuration settings Figure 7 File Select box CONFIG JPG select a configuration file to read Save in Data files EY Decprt cfg Test cfg EY Trigger Test cfg upT cfa F i EY LIDT Fast chg naise cFa EY slow cfg Documents Desktop Documents as Computer Network Places File name lecort ct Decaport Configuration File chg Save as Ippe Page 35 of 47 Lancel OM2201 5 BARTINGTON INSTRUMENTS Note A complete system is supplied with the factory test file This can be loaded to observe the correct configuration for the system supplied 9 6 2 Setup Control Window This window Figure 8 has the following fields D t Select e Decaport Select Lists the Decaports and A to D input cards that have EE been detected within the DAS1 The select
3. e Sensor Units Enter sensor units here using a single character in base SI unit notation e g for a magnetometer enter T for Teslas Do not use additional multiplier symbols e g uT Do not leave this field blank e Sensor Tag Enter a descriptive name for each sensor here or use the default names Sensor 1 Sensor 2 etc Do not leave this field blank Page 36 of 47 OM2201 5 BARTINGTON INSTRUMENTS Port 1 5 Power Sets the ON OFF state of the Decaport Power Supply for sensor ports 1 to 5 e Port 6 10 Power Sets the ON OFF state of the Decaport Power Supply for sensor ports 6 to 10 Port 1 5 Voltage Selects low 12 or high 14V power supply voltage for sensor ports 1 too e Port 6 10 Voltage Selects low 12 or high X 14V power supply voltage for sensor ports 6 to 10 e Leakage Test Initiates the cable leakage test as the system starts up Caution This button activates the test all Decaports Only Mag 03RC and DTS1 sensors are e compatible with the leakage test Do NOT use leakage test if any incompatible sensors are connected to the DAS1 The test may cause damage to the sensors Refer to Section 7 5 4 Cable Leakage Current Test Figure 9 Decaport Configuration window Sensor Fitted Input type Sensor Scale Sensor Mame Tag Factor 9 5 T Sensor 1E5 Sensor2 balanced fl M Sensor y Sensara 1 y
4. 1 6 Positive Supply Current i io Sensor 1 6 Positive Supply Voltage 1 Sensor 1 6 Negative Supply Current iow Sensor 1 6 Negative Supply Voltage os Leakage Test Current ee fo 15V Supply 5V Supply Page 22 of 47 OM2201 5 BARTINGTON INSTRUMENTS Se ee eee ee 0 Invalid Input output voltage uncertain Note Number in square bracket n is for ports 6 10 7 5 5 7 Power Supply Control Input Pins Power Supply Control Input pins are shown in Table 7 Note The four inputs Sensor PSU Enable Test Relay Enable Test PSU Enable and the LED have internal pull up resistors The PXI system default output states should be set to logic high to ensure that the system starts up in a safe mode Table 7 Power Supply Control Input Pins Cemdytmbe Pos 7 6 Low Pass Filters A low pass anti aliasing filter is incorporated in the Decaport with switchable frequency settings see the product brochure Each block of five channels is set independently with the option of disabling the filter altogether In Table 8 0 logic low OV 1 logic high 5V Table 8 Low pass filters Page 23 of 47 OM2201 5 BARTINGTON INSTRUMENTS o ph s we le e fo me Signal PXI function Pin With Mag 03 and Mag 03RC magnetometers a setting of 10kHz low pass filter must be used if the system must record across the full magnetometer 3kHz bandwidth Where sampling
5. Al 1 Out 10V Analogue Output 34 Al 8 Out 10V Analogue Output Ground OV Nominal Ground 10V Analogue Enable Select 4 P1 3 0 5V Digital Select 3 PSU Monitor P1 2 0 5V Digital Select 2 OV Nominal 0 5V Digital 0 5V Digital 0 5V Digital 0 5V Digital 0 5V Digital OV Nominal 0 5V Digital 0 5V Digital OV Nominal OV Nominal D Gnd Ground 22 2 3 P0 3 0 7 2 D Gnd Digital Ground Input Select 3 Input Select 4 Sensor Test 4 Test PSU Enable Sensor Test 3 Digital Ground Ground LED CNO Sensor Test 1 D Gnd Ground AO Gnd Digital Ground Analogue Input Ground Ground AO Gnd Ground OV Nominal Wim 22 HY A JA D A IAJ WwW U9 Ww Analogue Input Ground Al Gnd Ground OV Nominal Analogue Output Ground Sensor 3 Y Al 7 Output T Ui S 5 N 10V Analogue Page 27 of 47 OM2201 5 BARTINGTON INSTRUMENTS Sensor5 Z Al 14 10V Analogue Output Analogue Output Al Gnd Ground OV Nominal Ground Sensor 2 Z Al 5 10V Analogue Output 61 Sensor 5 X 112 10V Analogue Output 62 Analogue Output Al Sense Ground OV Nominal Reference 67 Sensor4 Z Al 11 10V Analogue Output Analogue Output Al Gnd Ground OV Nominal Ground Sensor 1 Z Al 2 Out 10V Analogue Output Sensor4 X Al 9 Out 10V Analogue Output Analogue Output Al Gnd Ground OV Nominal Ground Sensor 1 X Al a Out 10V Analogue Output Table 11 CN1 sensor channels 6 to 10
6. Sensorg gt Lri tmn E y Sensor 10 Port 1 5 Pork 7 10 Power Power Port 1 5 Port amp 10 voltage voltage Page 37 of 47 OM2201 5 BARTINGTON INSTRUMENTS 9 6 4 System Configuration Window Figure 10 System Confiauration window f This window Figure 10 has the following fields e Sample Rate Set the desired A to D conversion sample rate in this field The same sample rate is used on all sensor input channels This rate is divided by the decimation factor below to give the effective sampling rate per channel Care must be taken in setting this to a realistic value as the amount of processing will affect the maximum data the system can process e Decimation Factor Set this parameter to select the desired level of oversampling to increase effective A to D conversion resolution as shown in the table below This is used with the sample rate above to determine the effective sampling rate EE NE WENN NEN Page 38 of 47 OM2201 5 BARTINGTON INSTRUMENTS Effective Sample Rate This displays the effective sample rate per channel after the decimation factor has been applied Length of Display Buffer This parameter sets the length in number of samples at the effective sampling rate i e after decimation of the display on the monitor screen Length of Offset Buffer This parameter sets the length parameter N in Section 9 2 Forced Zero Offse
7. application takes control of the processor for more than the sample read period nominally set at 100 mSec then the buffer in the PXI NI A to D card will be overwritten and the data logging process will stop Page 31 of 47 OM2201 5 BARTINGTON INSTRUMENTS Note All general Windows maintenance Windows updates etc must be performed when the DAS1 software is not running 9 1 2 Data Save format Data is saved in a CSV csv file format All the data from one reading is in decimal text form on one line separated by commas with a carriage return at the end The first line in the CSV file carries the magnetometer label text An example file is shown here Sensor 1x 1 Sensor1z Sensor2x Sensor2y Sensor2z 11 E1 12 E1 20 ET 21 E1 22 E TO ET TLET 12 E1 20 E1 21 E1 22 E1 10 E1 11 E1 12 E1 20 ET 21 E1 22 ET 10 1 11 E1 12 E T 20 ET 2T E T 22 E 10 E1 11 E1 12 E1 20 ET 21 E1 22 ET 10 E1 11 E1 12 E1 20 E1 21 E1 22 E1 10 E1 11 E1 12 E1 20 E1 21 E1 22 E1 10 E1 11 E1 12 E1 20 E1 21 E1 22 E1 10 E1 11 E1 12 E1 20 E1 21 E1 22 E1 10 E1 11 E1 12 E1 20 E1 21 E1 22 E1 10 E1 11 E1 12 E1 20 E1 21 E1 22 E1 11 E1 12 E1 20 E1 21 E1 22 E1 10 E1 11 E1 12 E1 20 E1 21 E1 22 E1 9 2 Forced Zero Offset Compensation This facility allows removal of static or slow changing magnetic fields e g a local geomagnetic field For each sensor channel the
8. by the power supply monitor control inputs and is presented on the analogue output AI 15 for ch 1 5 and AI 31 for ch 6 10 Caution Ensure that the enable line is set false when changing monitor channel to prevent accidental shorts within the power supply circuit Use the following four stage cycle 1 Set PSU Monitor Enable false logic high Select parameter using PSU Monitor Select Inputs 0 4 Set PSU Monitor Enable input true logic low Read the analogue voltage from PSU Monitor Output Set PSU Monitor Enable false logic high 7 5 3 3 Power Supply Monitor Data The value returned for the voltage is half the measured voltage The value returned for the Al 15 CN 0 23 0 21 CN 1 6 fois current is the voltage measured across a 10 1 resistor and will include a small current drawn by the voltage measuring circuit Page 19 of 47 OM2201 5 BARTINGTON INSTRUMENTS Note The current drawn by a magnetometer will vary with the applied magnetic field Therefore this measurement is mainly intended for an indication of major changes in current due to fault conditions 7 5 4 Cable Leakage Current Test Caution This test must only be performed with Mag 03RC or DTS1 sensors Use with other sensor types may damage the sensor The test can be used to detect system faults caused by water ingress When the sensors form part of a seawater range seepage of water into the cable connectors or sensors will resul
9. effective sampling rate for 20 bit resolution is approx 1kHz 16670 divided by 16 9 5 Anti aliasing Filter The National Instruments PXI analogue input channels have an optional low pass filter set at 40kHz However this is located after the input multiplexer severely reducing the maximum sample rates The DAS1 software does not enable the programmable filter and the cut off frequency is fixed at 750kHz The software uses the low pass anti aliasing filter in the Decaport with switchable settings for each frequency Full details of the filter can be found in Section 7 6 Low Pass Filters 9 6 Setup Screens 9 6 1 Start up When the software is started the setup screen will be displayed Figure 6 Page 34 of 47 OM2201 5 Decaport Select Decaport 2 Sensor Fitted BARTINGTON INSTRUMENTS Sensor Scale Fa Input type ctor Figure 6 Startup screen Sensor Name Tag Default Sample Rate Hz J 5000 00 Decimation Factor Ji Fitted Balanced J 1E 5 T Sensor1 Effective Sample rate Decaport 3 5000 Decaport 4 Length of offset buffer Decaport 5 not Fitted Lenath of display buffer gr Sensor4 Decaport 6 J 500 F Not Fitted Unbalanced 1 LA Data Update Rate Decaport 7 0 WEM M x Data save File V Sensor10 Input Filter Port 1 5 Port 7 10 Power Power Save Port 1 5 Port 6 10 Voltage Voltage
10. format e atabular format showing data from each sensor in X Y and Z columns The following controls are available Stop Click on this button to close the DAS1 software return to Windows e Setup Click on this button to return to the Setup and Configuration windows Input Filter These buttons enable the user to change the anti aliasing filter frequency during data sampling e Display Select Toggles the graphical display between time domain oscilloscope format and frequency domain spectrum analyser format Page 40 of 47 OM2201 5 BARTINGTON INSTRUMENTS e Table This displays the sampled data in numerical table format one row of three columns channels for each sensor that has been set to Fitted in the Sensor Configuration window The table is also used to select the inout channels that are present in the graphical display Double clicking on the table box for a particular channel will e add remove the channel to from those included in the graphical display if Table Select Control is in View mode Any number of channels can be shown in the time domain display but only one the last selected will be shown in frequency domain mode Channels currently displayed have a blue background e set that channel s sensor into test mode if the sensor type is set to Balanced and if Table Select Control is in Test mode Sensors in mode test have a red background Table Measurement These buttons select the type o
11. frequencies below 20kHz are used set the filter to a lower frequency to avoid aliasing Note This filter is only intended for anti aliasing purposes and filter frequencies are only approximate values If a high accuracy frequency filter is required it should be implemented in software digital signal processing routines available in most data processing software 7 7 Auxiliary I O connector Details including pin out of the connector that provides access to the analogue output and trigger inputs available on the PXI6289 card are given in the product brochure 7 7 1 Analogue Outputs These are buffered and presented as balanced outputs See the product brochure for range Each output has the same EMC protection as the sensor inputs For further information on the analogue outputs consult the National Instruments documentation 7 7 2 APFI Trigger Inputs These digital inputs pass through to the 6289 card via the same EMC protection as the sensor inputs For further information on the APFI inputs consult the National Instruments documentation and the product brochure Page 24 of 47 OM2201 5 BARTINGTON INSTRUMENTS 15 9 Table 9 Auxiliary I O connector pin out Case Ground AO1 ve Out AO2 ve Out APFIO Signal 7 8 PXI Interface Connections by Pin CNO and CN1 pin out details are given in Tables 10 and 11 Table 10 CNO sensor channels 1 to 5 PSU Voltage 1 6 0 5V Digital Select In n Page 25
12. logic low 0V enables the leakage test power supply 7 5 5 5 LED Page 21 of 47 OM2201 5 BARTINGTON INSTRUMENTS A logic low OV sets the LED red A logic high 5V sets the LED green 7 5 5 6 PSU Monitor Enable PSU Monitor Select 0 4 These controls enable and select the power supply parameter that is routed to the PSU Monitor Output signal according to Table 6 Caution Ensure that the PSU Monitor Enable line is set to DISABLED logic high before changing monitor select inputs to prevent accidental shorts within the power supply circuit Table 6 PSU Monitor Select Function De x x X X 1 Mentorbsabled outputvotage uncer Pett Sensor 217I Positive sunniy curent e 1 1 a 9 sensora postive upphVotage _ Cv e 1 1 Ta _ 0 _ sensor217INegatvesupaly curent s e 1 1 1 sewrategstvesuey volue a Ji fo 1 sensors wpostivesuppiy curent _ o i e 1 9 sensors i Postivesuppiyvotage _ Py Sensor atel Negative supaiy Curent oi e sensors ta negative 1 1 Sensor 4 9 Positive Supply Current Sensor 4 9 Positive Supply Voltage 1 1 1 1 Sensor 4 9 Negative Supply Current Sensor 4 9 Negative Supply Voltage Sensor 5 10 Positive Supply Current Sensor 5 10 Positive Supply Voltage 1 Sensor 5 10 Negative Supply Current 0 10 o Jo o Jo o o Jo o Jo oo Sensor 5 10 Negative Supply Voltage 1 alos Sensor
13. of 47 OM2201 5 NO N W UJ N N N N N N INJ gt gt UJ N O o N IAITU PSU Monitor Enable Digital Ground No Connection Digital Ground PSU Monitor Select 1 PSU Monitor Select 0 Digital Ground Digital Ground No Connection Digital Ground Test Relay Enable Sensor Test 2 Digital Ground Sensor Test 5 APFIO Analogue Input Analogue Input PSU Monitor Out Analogue Output Ground Sensor 3 X Output Sensor 5 Y Output Analogue Output Ground Sensor 2 Y Output Analogue Output Ground Sensor2 X Output Sensor4 Y Output BARTINGTON INSTRUMENTS Un D Gnd 5 D Gnd 0 N 25 2 D Gnd D Gnd 5V D Gnd Dod D Gnd P0 4 APFIO AO 1 Al 15 Al Gnd Al 6 113 Al Gnd Al 4 Al Gnd Al 3 Al 1a Page 26 of 47 Ground Ground Ground Ground Ground Ground Ground Out Out Ground Out Ground Out Out 0 5V Digital OV Nominal OV Nominal 0 5V Digital 0 5V Digital OV Nominal OV Nominal OV Nominal 0 5V Digital 0 5V Digital OV Nominal 0 5V Digital 0 5V Digital 10V Analogue 10V Analogue 10V Analogue OV Nominal 10V Analogue 10V Analogue OV Nominal 10V Analogue OV Nominal 10V Analogue 10V Analogue OM2201 5 BARTINGTON INSTRUMENTS Ground 33 Sensor 1 Y
14. rightmost column of this table shows the results of the leakage current test if enabled if the leakage current test is not enabled this column is blank The power monitor runs once at start up then stops to keep the system noise to a minimum e Retest Button Use this button to trigger the power monitor to run the power and cable if enabled tests once The system will complete one set of measurements displaying the new results as they are acquired Note The data shown in the tables is intended only for detection of faulty sensors or cables rather than accurate determination of system power consumption Page 42 of 47 OM2201 5 BARTINGTON INSTRUMENTS 11 Troubleshooting Solution No power in the The circuit breaker Check the circuit breaker switch on the rear PXI chassis may have activated panel of the PXI rack If the circuit breaker activates for a second time the equipment may require repair No power to one The PSU enable Check in the software or your own control group of five signal may not be set program that the Sensor PSU Enable signal for Sensors correctly these sensors is set to the correct state The sensor PSU Power down the full system allow to cool for a protection fuse may few minutes then re power to clear the fault have tripped The sensor input may Check the settings in the software or your own Faulty signal from be set to the incorrect control program a sensor type balanced or unb
15. system The system must be completely dry before the electrical supply is reconnected Caution Never use chemicals such as solvents when cleaning the DAS1 Caution Take particular care when cleaning around electrical connections Bent or damaged pins may cause the equipment to malfunction 12 2 Calibration Return the DAS1 to Bartington Instruments for calibration at the recommended intervals Refer to the calibration certificates for further details 13 End of Life Disposal This product electrical and electronic equipment should not be placed in municipal waste Check local regulations for disposal of electronic products px Page 44 of 47 OM2201 5 BARTINGTON INSTRUMENTS Page 45 of 47 OM2201 5 BARTINGTON INSTRUMENTS Page 46 of 47 OM2201 5 Bartington Instruments Limited 5 10 amp 11 Thorney Leys Business Park Witney Oxford OX28 AGE England OM2201 5 The specifications of the products described in this brochure are subject to change without prior notice Bartington is a registered trademark of Bartington Instruments Ltd in Australia Brazil Canada China the European Community India Japan the countries of the Madrid Agreement amp Protocol Norway and the United States of America Windows is a registered trademark of Microsoft Corporation in the United States and other countries National Instruments and LabVIEW are trademarks of National Instruments Corporation 44
16. 0 1993 706565 44 0 1993 774813 salesebartington com rtington com
17. Innovation in Magnetic Field Measuring Instruments Operation Manual for DAS1 Magnetic Range Data Acquisition System bartingtonr Instruments www bartington com BARTINGTON INSTRUMENTS Table of Contents 1 About this Manual 5 1 1 Symbols Glossary 5 2 Safe Use 5 3 Compatible Magnetometers 6 4 Introduction to the DAS1 6 4 1 Summary 6 4 2 System Architecture 6 4 3 Decaport Features 7 4 3 1 Front Panel 7 4 3 2 Rear panel 8 4 4 PXI Chassis Features 9 4 4 1 Rear panel 9 4 5 System Configuration Options 9 5 Installing the DAS1 System 10 5 1 Location of Equipment 10 5 1 1 Potentially Hazardous Locations 10 5 1 2 Mounting 10 5 1 3 Orientation 10 5 1 4 Ventilation 10 5 2 Connecting the Equipment 10 5 2 1 PXI Decaport Cabling 10 5 2 2 CPU Peripherals and Interfaces 11 5 2 3 Remote Computer Connection 11 5 2 4 Sensors 11 5 2 5 AC Mains Power Cables and Earthing 11 6 Using the DAS1 System 11 6 1 Switching the Equipment On and Off 11 Page 2 of 47 OM2201 5 BARTINGTON INSTRUMENTS 6 2 Operating the System 6 2 1 Standard DAS1 Software 6 2 2 User designed Software 7 Decaport Interface Module Technical Reference 7 1 Interface and Control 7 2 Other National Instruments Interfaces 7 3 Sensor Inputs 7 3 1 Balanced Input Connection 7 3 2 Unbalanced Input Connection 7 3 3 Input Connector Pin Out 7 3 4 Setting Sensor Input Type 7 3 5 Sensor Test Enable 7 4 Senso
18. a rack with deeper units ensure the back panel of the Decaport can be accessed 4 3 1 Front Panel Figure 1 Decaport front panel Key to Figure 1 1 LEDindicator Inputs 1 to 5 The LED colour state red or green is controlled by the user software 2 LEDindicator Inputs 6 to 10 The LED colour state red or green is controlled by the user software 3 ON OFF power switch Controls overall power to the Decaport 4 Sensor connector sockets Inputs 6 to 10 Set of five input sockets for connection of three axis magnetometers or other compatible sensors 5 Sensor connector sockets Inputs 1 to 5 Set of five input sockets for connection of three axis magnetometers or other compatible sensors Page 7 of 47 OM2201 5 BARTINGTON INSTRUMENTS 4 3 2 Rear panel Figure 2 Decaport rear panel Key to Figure 2 1 gt A Mains input sockets for connection of IEC lead See the product brochure for supply voltage PXI interface socket CN1 Connection for inputs 6 to 10 to the PXI rack 6289 DAQ module or equivalent PXI interface socket CNO Connection for inputs 1 to 5 to the PXI rack 6289 DAQ module or equivalent AUX I O connector The auxiliary signals are described later in this document Earth terminal post If an appropriate earth ground connection is not provided through your mains supply lead connect this terminal post to the PXI Chassis earth terminal the 19 rack and a permanent earth ground
19. alanced Cable fault Check the cabling If sensor is a Mag 03RC use cable leakage test see Section 7 5 4 Unexpected Data sampling may be Ensure you have the anti aliasing low pass frequencies causing aliasing filters set to a suitable value to match your present in the sampling frequency sensor signals If problems remain after following the troubleshooting guide contact the Bartington Instruments helpdesk 12 Care and Maintenance 12 1 Cleaning Hh WARNING Disconnect the electrical supply before performing any cleaning operation 12 1 1 Dust Filters The PXI chassis has two dust filters for the cooling fans in the rear panel The filters require periodic cleaning To access the filters 1 Loosen the screw in the centre of the vented panel Page 43 of 47 OM2201 5 BARTINGTON INSTRUMENTS 2 Remove the vented panel right hand end first 3 Remove the filters and gently clean them with water 4 Ensure the filters are completely dry replace them and refit the vented panel and its screw Note The cleaning period will depend on your environmental conditions A maximum period of 6 months is suggested 12 1 2 General Other than the dust filters periodic cleaning is not normally required If the system becomes soiled and cleaning is necessary 1 Use a damp cloth to clean the outer surfaces 2 Useanair duster to blow debris from the connectors WARNING Ensure water does not enter the
20. are static logic i e no shift registers latches or clocks are used If an alternative data acquisition system is used most of the control lines could be hardwired to the required state however it is recommended that the magnetometer Power Enable lines are controllable If the power supply monitor and or other control functions are to be utilised then sufficient control lines will be required 7 2 Other National Instruments Interfaces The Decaport will directly connect to other data acquisition cards and modules from National Instruments These can offer different solutions such as desktop computer PCI bus and USB bus Note Bartington Instruments cannot guarantee that these solutions will achieve the published specification of the Decaport and standard range data acquisition system 7 3 Sensor Inputs The Decaport can connect up to ten Bartington Instruments three axis magnetometers or other compatible sensors Each input can be set independently to operate with either an unbalanced single ended or balanced differential output sensor please refer to the sensor s datasheet for details of it s output The setting will automatically select the correct wiring of the input connector See the product brochure for details of connectors Note Bartington Instruments can supply suitable cables for all types of compatible sensors Page 13 of 47 OM2201 5 BARTINGTON INSTRUMENTS 7 3 1 Balanced Input Connection b X Output X 8 ut
21. as described in Section 5 2 4 AC Mains Power Cables and Earthing WARNING The mains supply must be earthed Ensure all local and national codes on electrical installation and grounding are observed Page 8 of 47 OM2201 5 BARTINGTON INSTRUMENTS 4 4 PXI Chassis Features 4 4 1 Rear panel Pte ue i mr B WINE Bill E IL BREMNER Figure 3 PXI chassis rear panel Key to Figure 3 Circuit breaker Protects the PXI unit against an over current condition 2 Mains input sockets for connection of IEC lead See the product brochure for supply voltage 3 Earth terminal point If an appropriate earth ground connection is not provided through your mains supply lead see Section 5 2 4 AC Mains Power Cables and Earthing for alternative measures Consult the NI PXI 1042 Series documentation for full details 4 Filter cover R and retaining screw L This cover can be removed to access the filters for periodic cleaning 4 5 System Configuration Options The Decaport and PXI system are connected using an industry standard PXI interface configuration This enables users to construct a system based on individual component modules if desired rather than the full DAS1 system For example the user could choose to substitute a remote computer with suitable PXI interface in place of the DAS1 standard CPU controller Page 9 of 47 OM2201 5 BARTINGTON INSTRUMENTS module Configuration using the integra
22. ata to another system Power supply monitoring cable leakage test and sensor self test where available are all provided under software control 4 2 System Architecture The DAS1 consists of two main components e Oneor more Decaport Interface Modules which power attached sensors and provide analogue signal conditioning of the sensor output signals Each Decaport module can support up to 10 three axis magnetometers or other compatible sensors e APXI Data Acquisition system which provides A to D conversion of the magnetometer signals and processing and storage of the acquired data The PXI system consists of a CPU controller module or alternatively an interface via a PXI remote control module to a remote computer control system and A to D conversion modules housed in a standard PXI chassis Each A to D module supports one Decaport Interface with the entire system is via a monitor and keyboard connected to the CPU or a remote computer connected to the PXI remote control module Page 6 of 47 OM2201 5 BARTINGTON INSTRUMENTS The modular design of the DAS1 allows Decaports and A to D modules to be added if required to support additional sensors The minimum configuration is one Decaport and one A to D module 4 3 Decaport Features The Decaport conforms to the standard 19 inch rack mount specification and is 1U Rack Unit high It does not require any extra space above or below Note If a single Decaport is mounted in
23. average of the last N readings is taken to obtain an offset value this offset is subtracted from the current reading The readings are stored in an averaging buffer The value of N can be varied by the user There are four controls for this function e LOCK Holds the offset at the current value and stops adding new data to the averaging buffer e CLEAR Sets the offset to zero and fills the averaging buffer with zeroes SET Sets the offset to the current reading and fills the averaging buffer with this value e OFF The offset is not subtracted from the current reading The averaging buffer continues to store readings Page 32 of 47 OM2201 5 BARTINGTON INSTRUMENTS 9 3 Sample Rate Considerations The A to D converter board consists of a high speed 18 bit converter with a sample rate of 500Ksamples sec The board includes an analogue switch multiplexer allowing the sampling rate to be shared across 32 input channels Hence the actual sample rate per channel depends on the number of channels selected to be active When the DAS1 is used with three axis magnetometers each magnetometer requires three input channels The maximum achievable sample rate per channel can be determined using the formulae and table below The sample rate S per channel is given by S ADC sample rate Number of magnetometers x Channels per magnetometer Taking the Nyquist sampling criterion the maximum frequency response bandwidth is given by sa
24. balanced Input X axis Positive Signal X axis Signal fe Weefovesunp PostivePoner Supply Xavienegatve signal NoComnecion oY I 7 3 4 Setting Sensor Input Type The sensor input types are set individually for each sensor by digital I O lines from the PXI interface The Input Select lines are 5V TTL compatible static inputs See Table 2 Table 2 Setting sensor input type A logic high 5V on an Input Select sets the balanced input mode a logic low OV selects the unbalanced input mode Page 15 of 47 OM2201 5 BARTINGTON INSTRUMENTS 7 3 5 Sensor Test Enable A test function is available on some Bartington Instruments sensors This causes a fixed offset to be added to each of the magnetometer outputs The Sensor Test Enable signals will initiate the test function on an attached sensor This function is only available when the input is set to the balanced mode Table 3 Sensor test enable Sensor Testenable P00 THX NN A logic low OV on a Test Enable signal puts an attached sensor in to test mode A logic high 5V puts the sensor into normal operating mode 7 4 Sensor Outputs 7 4 1 Analogue Output Connections Table 4 Analogue output connections Sensor 1 Y Output Al 1 Page 16 of 47 OM2201 5 BARTINGTON INSTRUMENTS Analogue Output Reference Al SENSE 0 CNO0 62 Sensor6 X Output Al 16 CN 1 68 9 Y Output Analogue Output Reference Al SENSE 1 CN 1 62 2 T
25. buttons for empty Decaport slots will be greyed out Clicking on each Decaport button displays its sensor settings in the main window for editing or review Decaport 2 Save Opens a window allowing the setup configuration to be saved as a Decaport 3 cfg file Decapork 4 e Load Opens a window allowing the setup configuration be loaded capar from a cfg file Decaport 6 e OK Closes the setup screen and displays the signal monitor screen Decaport 7 9 6 3 Decaport Configuration Window This window Figure 9 has the following fields e 1 0 slot Shows the I O slot number used within the LabVIEW software Sensor Fitted Controls each of the Decaport inputs to be enabled Fitted or disabled Not fitted When Fitted the input is allocated three channels of A to D converter sampling If set to Not Fitted no sampling channels ai are allocated e Input Type Sets the input to Balanced or Unbalanced mode on the Decaport The magnetometer test function will operate on a sensor if and aW only if its input type is set to Balanced e Sensor Scale Factor Enter the scaling factor for your sensor in this field Load The value is interpreted as the per volt quantity using the units set in Sensor Units see below For example for magnetometer with a full Seu scale of 100uT for 10V output the output is TOUT per volt so set this field to window 10E 5 0 00001
26. current on each rail to approximately 50mA The fuses can be reset by switching off the unit and allowing it to cool for a few minutes Two 1A slow blow fuses are fitted internally to limit the mains supply current to each of the power supply modules WARNING If the power supply 1A fuses have blown this indicates a faulty unit Contact Bartington Instruments 7 5 3 Power Supply Monitor To allow monitoring of the connected sensors whilst the system is operational the current and voltage to each sensor and the internal power supply voltages can be routed to an analogue output for measurement by the A to D system 7 5 3 1 Power Supply Monitor Select Input Pins Power supply monitor select input pins are shown in Table 5 Table 5 Power Supply Monitor Select Input Pins Signal PXI function Pin PSU Monitor Select o PSU Monitor Select 1 P1 1 CN 0 10 PSU Monitor Select 2 CN 0 83 Page 18 of 47 OM2201 5 PSU Monitor Select 3 PSU Monitor Select 4 PSU Monitor Output 1 5 Signal PSU Monitor Enable PSU Monitor Select 0 PSU Monitor Select 1 PSU Monitor Select 2 PSU Monitor Select 3 PSU Monitor Select 4 PSU Monitor Output 6 10 BARTINGTON INSTRUMENTS Note The input PSU Monitor Enable has an internal pull up resistor The PXI system default output state should be set to logic high to ensure that the system starts up in a safe mode 7 5 3 2 Using the Power Supply Monitor The parameter to be read is selected
27. ensity VI e Window The time domain window to apply to the time signal e Averaging mode Specifies the averaging used Number of averages Specifies the number of averages used for RMS and vector averaging Page 39 of 47 OM2201 5 BARTINGTON INSTRUMENTS 10 Monitor Screens 10 1 Signal Monitor The Signal Monitor window Figure 11 is displayed when the user clicks OK in the Setup Control window Graphical Display Power Monitor Offset Display Autoscale Waveform Display Display select 2 72519E 7 Sensorix MEN os Sensor2 2 LOCK L5E 7 0 FFT Graph CLEAR ONCE 1E 7 5E 8 FFT Parameters c 0 FFT window e 1E 7 al Averaging mode Input Filter 1 5 7 FFT No of averages 2 5 7 FFT Average Done we ES 0 0 01 0 02 0 03 0 04195 Data Process Filter ime Filter Type AA jJ OFF Data Table Filter High Cutoff Table Mesurement 2 AVE Sensori 150 2nT 150 2nT 149 4nT VIEW Reset i Filter Low cuttoff Sensor2 150 2nT 148 6nT 149 4nT View J 100 c Filter Order es Aa TEST Active T SETUP EXIT OFFSET Figure 11 Signal Monitoring window The Signal Monitor window displays the sampled data from sensors connected to the Decaports The window includes both e agraphical oscilloscope style display with the option to switch between time domain oscilloscope format and frequency domain spectrum analyser
28. ent Data The leakage current is measured as the voltage across a 47 resistor Page 20 of 47 OM2201 5 BARTINGTON INSTRUMENTS Use the following formula to calculate the leakage current the formula includes a correction to compensate for the quiescent current drawn by the measuring circuits mA Where V is the voltage returned by the leakage current measurement V is the power supply voltage nominally 15V This is not intended to yield a fully accurate result but will alert the user to any significant increase in leakage current due to seawater ingress 7 5 5 Power Supply Control Signal Functions The power supply functions are controlled by digital I O lines from the PXI interface The input signals are 5V TTL compatible static inputs 7 5 5 1 Sensor PSU Enable A logic low 0V enables the sensor power supplies Note The states of both Test Relay Enable and Test PSU Enable described below are ignored when Sensor PSU Enable is low 7 5 5 2 Sensor PSU Voltage A logic high 5V selects the higher voltage 14 sensor power supplies A logic low OV selects the lower voltage 12 sensor power supplies 7 5 5 3 Test Relay Enable A logic low OV selects the leakage test power supply A logic high 5V enables the normal sensor power supply Caution Both supplies must be disabled using Sensor PSU Enable before changing the state of Test Relay Enable 7 5 5 4 Test PSU Enable A
29. f data that is displayed for each channel in the table and written to the data save file e The average of the display buffer values is used peak to peak measurement of the values in the display buffer is used e RMS The Root Mean Square of the display buffer values is used e Offset The Forced Zero Offset value is used e Sample most recent sampled data value is used Use this setting to record all data samples after decimation to be written to the data file This gives a complete record of the data collected but will very quickly generate a large data file e Table Select Controls These set the mode for the display table e View Sets the table into View mode allowing channels be toggled in and out of the graphical display e Test Sets the table into Test mode allowing sensors be toggled in and out of test e Reset View Clears all channels except sensor 1 channel X from the graphical display and sets the table into View mode e Test Active This is illuminated when test is active on one or more sensors Clicking this button turns off all sensor tests and sets table into Test mode e Offset Controls Use this button to set the desired offset mode as described in Section 9 2 Forced Zero Offset Compensation If the set button is flashing the buffer contains insufficient values to calculate a correct offset After a period of time dependent on the sample rate this situation will
30. from the Decaport rear panel connectors CNO and see Figure 2 Decaport rear panel to the PXI Chassis A to D module Connector 0 and Connector 1 respectively Route the cables through the large aperture on the right hand side of the PXI chassis Page 10 of 47 OM2201 5 BARTINGTON INSTRUMENTS If your system has more than one Decaport A to D pair connect the top Decaport in the stack to the leftmost A to D card in the chassis etc Note The PXI cables can be left permanently connected but may need to be removed if the system is ever repacked for transportation 5 2 2 CPU Peripherals and Interfaces If the system includes the CPU controller module connect a suitable display to the CPU DVI I connector and a keyboard and mouse to free USB connectors Connect any other interfaces e g Ethernet serial USB that you require for your system implementation 5 2 3 Remote Computer Connection If your system includes an interface for connection of a remote control computer connect the supplied cable and card MXI Express or MXI ExpressCard to the remote computer 5 2 4 Sensors Connect the cabling from your system sensors e g magnetometers depth tilt sensors to the Decaport front panel input sockets for details see Section 7 3 Sensor Inputs 5 2 5 AC Mains Power Cables and Earthing Connect the supplied IEC mains cables to the mains inlet sockets on the PXI chassis and Decaports Note Each Decaport requires its o
31. he Decaport sensor signal outputs to the PXI rack are analogue single ended with a range of 10V Note The full DAS1 system uses the PXI A to D converter modules in Non Referenced Single Ended NRSE configuration to avoid problems of ground offset In this configuration the A to D converter measures the voltage of an analogue input Al signal relative to one of the Al SENSE inputs which is connected to a star point common ground reference for each group of 16 inputs on the Decaport PCB This input configuration is recommended if users are implementing their own A to D system Page 17 of 47 OM2201 5 BARTINGTON INSTRUMENTS 7 5 Power Supply The Decaport has two internal 30W 15V supplies that require a 100 250 VAC supply via an IEC connector on the rear panel see Figure 2 Each power supply independently provides power for five sensors and their signal conditioning electronics The 15V supply is used internally It is also reduced to 12V and supplied externally to the sensors Note Long cables can cause a power voltage drop at the sensor The Decaport can be programmed to increase the sensor supply output to 14V to compensate for this loss This can be set independently for each set of five sensors 7 5 1 Power Switch The mains power switch is situated on the right hand of the front panel See Figure 1 7 5 2 Protection The power supply to each sensor is protected by self resetting semiconductor fuses that limit the
32. l In 52 Sensor Test 6 8 0 5V Digital 9 50 51 54 Analogue Input AO Gnd Ground OV Nominal Ground 56 Analogue Input AO Gnd Ground OV Nominal Ground Analogue Output Al Gnd Ground OV Nominal Ground 57 8 Al 23 Out 10V Analogue Output 58 Sensor 10 Z Al 30 Out 10V Analogue Output 59 Analogue Output Al Gnd Ground OV Nominal Ground Sensor 7 Z Al 21 Out 10V Analogue Output Page 30 of 47 OM2201 5 BARTINGTON INSTRUMENTS 61 Sensor 10 X Al 28 Out 10V Analogue Output 63 Sensor 9 Z Al 27 Out 10V Analogue Output 65 Sensor 6 Z Al 18 Out 10V Analogue Output 67 Analogue Output Al Gnd Ground OV Nominal Ground 8 PXI Documentation The PXI Data Acquisition system is detailed in the National Instruments documentation provided separate to this manual 9 Software User Manual The software supplied with the DAS1 is a data capture system Output is a data file in Comma Separated Variable CSV format Note The software is a LabVIEW application LabVIEW source files are supplied to enable users to extend and customise the system if they possess a suitable licensed LabVIEW development system 9 1 Windows 9 1 1 Running Background Applications The DAS1 system is supplied with Windows XP installed When running the DAS1 software do not run other applications within Windows This will limit the processing time available for data collection and may cause errors If an
33. l CPU module and an alternative configuration using a PCMCIA or PCI interface to an external computer are given in the product brochure 5 Installing the DAS1 System 5 1 Location of Equipment 5 1 1 Potentially Hazardous Locations WARNING This equipment is powered by mains electricity It should not be used in wet or damp locations where water may enter the unit and create a safety hazard 5 1 2 Mounting WARNING The DAS1 is normally supplied within a 19 rack Failure to use the rack or another suitable fixing method may create a risk of personal injury or damage to the DAS1 in the event of it falling It is recommended that the system be used in the supplied rack 1 Caution If the system is be transferred an equivalent 19 rack it is important to leave 1U Rack Unit of free space above the PXI chassis component to ensure adequate cooling 5 1 3 Orientation Caution The equipment should be used in a horizontal orientation in the 19 rack to ensure correct cooling 5 1 4 Ventilation Caution Ensure that the location does not restrict ventilation from the fans in the back of the PXI chassis 5 2 Connecting the Equipment Caution Connect all external sensors and peripheral devices to the DAS1 before switching on power to system Damage may occur if equipment is connected or disconnected whilst powered 5 2 1 PXI Decaport Cabling For initial system assembly connect the PXI cables
34. m from Bartington Instruments It should be read in conjunction with the product brochure DS2201 which can be found found on the product page of the Bartington Instruments at www bartington com The DAS1 system includes a PXI chassis from National Instruments Instructions for operation of the PXI chassis can be found on the National Instruments website at www ni com 1 1 Symbols Glossary The following symbols used within this manual call your attention to specific types of information WARNING Indicates a situation in which serious bodily injury or death could result if the warning is ignored Caution Indicates a situation in which bodily injury or damage to your instrument or both could result if the caution is ignored Identifies items that must be disposed of safely to prevent unnecessary damage to the environment B Note A note provides useful supporting information and sometimes suggests how to make better use of your purchase 2 Safe Use WARNING These products are not qualified for use in explosive atmospheres or life support systems Consult Bartington Instruments for advice A WARNING The DAS1 is powered by mains electricity The unit MUST be earthed The centre pins of the IEC mains inlet sockets on the rear panel of the Decaport units and the PXI rack are internally connected to all the metal panels of the unit Use of the 3 core IEC mains connecting cables supplied with the unit will ens
35. mple rate per channel F therefore max S 2 E ADC sample rate 2 x Number of magnetometers x Channels per magnetometer Table 12 Number of data channels per magnetometer with sample rate and bandwidth As shown in Table 12 fully populated Decaport A to D board combination 10 three axis magnetometers will use 30 input channels but still provide a sample rate of 16 67 kHz per channel and a bandwidth of 8 33 kHz at 18 bit resolution If a higher sample rate per channel is required reduce the number of sensors connected to each Decaport A to D board Page 33 of 47 OM2201 5 BARTINGTON INSTRUMENTS Note These calculations indicate the sample rates available in the PXI A to D board hardware If the user extends the DAS1 LabVIEW application the maximum achievable sampling rates may be limited by other data processing activities being performed by the software 9 4 Oversampling Oversampling data decimation can be used to increase the native 18 bit A to D resolution Use the formula S 4 where N is the number of extra bits of binary data required 5 is the oversampling factor The oversampling factor can be set in the DAS1 software For example to achieve 20 bit resolution two extra bits are required giving an oversampling factor of 16 The effective sample rate is given by the A to D board per channel sample rate divided by the oversampling factor For a fully populated 10 x three axis sensors Decaport the
36. pu T Y Output Y 9 utpu dis Z Output Z 10 PES TOS Power ne ower Supply Test 5 Q QO Ground 4 Test Switch Figure 4 Balanced Input Connection In balanced mode Figure 4 the differential signals and input amplifiers give the best possible accuracy There is no interaction of signal ground currents and unequal sensor ground potentials caused by different voltage drops in the power ground cabling Compared to unbalanced mode this configuration has the higher interference noise rejection as noise will appear as a common mode signal at the input amplifiers 7 3 2 Unbalanced Input Connection X 10 gt X Output TEZ Q gt Y Output Zt3 6 Signal Ground 5 O Power Ground 4 Ground Figure 5 Unbalanced Input Connection In unbalanced mode Figure 5 the differential inout amplifiers are retained This eliminates the effect of differing signal ground potentials of each sensor caused by differing voltage drops in the power ground cabling However the unbalanced mode is inferior to the balanced mode The use of acommon signal ground gives reduced accuracy with very long cables due to interaction of the signal ground currents This configuration is also more susceptible to interference noise Page 14 of 47 OM2201 5 BARTINGTON INSTRUMENTS 7 3 3 Input Connector Pin Out See Table 1 Table 1 Input Connector Pin Out Pin Balanced Input Un
37. r Outputs 7 4 1 Analogue Output Connections 7 5 Power Supply 7 5 1 Power Switch 7 5 2 Protection 7 5 3 Power Supply Monitor 7 5 4 Cable Leakage Current Test 7 5 5 Power Supply Control Signal Functions 7 6 Low Pass Filters 7 7 Auxiliary I O connector 7 7 1 Analogue Outputs 7 7 2 APFI Trigger Inputs 7 8 PXI Interface Connections by Pin 8 PXI Documentation 9 Software User Manual 9 1 Windows Page 3 of 47 12 12 12 12 13 13 13 14 14 15 15 16 16 16 18 18 18 18 20 21 23 24 24 24 25 31 31 31 2201 5 BARTINGTON INSTRUMENTS 9 1 1 Running Background Applications 9 1 2 Data Save format 9 2 Forced Zero Offset Compensation 9 3 Sample Rate Considerations 9 4 Oversampling 9 5 Anti aliasing Filter 9 6 Setup Screens 9 6 1 Start up 9 6 2 Setup Control Window 9 6 3 Decaport Configuration Window 9 6 4 System Configuration Window 10 Monitor Screens 10 1 Signal Monitor 10 2 Power Monitor 11 Troubleshooting 12 Care and Maintenance 12 1 Cleaning 12 1 1 Dust Filters 12 1 2 General 12 2 Calibration 13 End of Life Disposal Notes Page 4 of 47 31 32 32 33 34 34 34 34 36 36 38 40 40 42 43 43 43 43 44 44 44 45 2201 5 BARTINGTON INSTRUMENTS 1 About this Manual This document describes the installation operation and maintenance of the DAS1 Data Acquisition Syste
38. resolve automatically as sampled data fills the buffer FFT Controls These controls set the parameters for the FFT display spectrum analyser format as described FFT Parameters in Section 9 6 4 System Configuration Window Page 41 of 47 OM2201 5 BARTINGTON INSTRUMENTS Data Process Filter Controls These controls alter the digital filter applied to the sampled data as described in Data Process Filter in Section 9 6 4 System Configuration Window The Power Monitor window Figure 12 displays the readings from the most recent sensor and cable leakage test if enabled Positve Voltage Negative Voltage Negative Current 15 Supply 5 Supply 15V Supply a Channels 1toS 1 65v ase Channels6to10 1585 140W praw Channels 10to 15 56 081 56 08m S amp DmV Channels 166020 6 08mv S6 0mv S amp DmV A328 pu RH 858v an an cn n Cn D co e 56 08mV 56 08mVv on on en en cn e e e o joloiolo Go co Ef an on Cn ouo cm E Figure 12 Power Monitor window The left hand table shows the power supply voltage and current for each sensor Where a sensor is not fitted the current value is blank The right hand table shows internal supply voltages for each five input section of the Decaport s fitted The
39. t Compensation of the buffer used to calculate the forced zero offset average after decimation Data Save File To save data in a file enter the desired filename and path If the field is blank data is displayed on screen but not saved Data Type Selects the data storage format Errors may be caused at high sample rates if data types that require significant processing are selected Trigger Source Sets the source for the start trigger Trigger Edge Voltage Sets the trigger voltage level and rising falling direction to start data acquisition When the trigger source voltage crosses the trigger threshold voltage in the correct edge direction data acquisition will start Input Filter Use these buttons to select the anti aliasing filter as described in Section 9 5 Anti aliasing Filter Data Process Filter These settings control digital filtering that can be applied to the sampled data modifying the values for display Low pass high pass bandpass or bandstop filters can be selected The upper and lower frequencies and the filter mathematical order slope rate can also be set For more detailed information refer to the LabVIEW help files on the IIR cascade Filter with IC amp set IIR software Filter VI s FFT parameters These fields set the control parameters for the Fast Fourier Transform FFT display spectrum analyser format For more detailed information refer to the LabVIEW help files on the FFT Power Spectral D
40. t in a significant leakage current being detected Significant leakage current is an indication of a potential fault in the system The test enables the power supply leakage current to be measured for each block of five sensors by placing 15V on both power supply lines 7 5 4 1 Implementing the Cable Leakage Test Use the following sequence to implement the cable leakage test 1 Select the leakage current monitor in the power supply monitor function 2 Turn off the magnetometer power supply by setting Sensor PSU Enable false logic high 3 Select the leakage test supply by setting Test Relay Enable true logic low 4 Enable the leakage test power supply by setting Test PSU Enable true logic low 5 Wait sufficient time for the current to stabilise The measuring circuit uses a high impedance 47kQ with a long cable The time constant will be significant 6 Read the value returned on the analogue output Al 15 ch 1 5 or Al 31 ch 6 10 7 Disable the leakage test power supply by setting Test PSU Enable false logic high 8 Select the magnetometer supply by setting Test Relay Enable false logic high 9 Restore the magnetometer power supply by setting Sensor PSU Enable true logic low Note This process interrupts the power supply to the magnetometers and should not be carried out when the data capture system is active It should be used as part of the system Start up and verification procedure 7 5 4 2 Cable Leakage Curr
41. ure the unit is correctly earthed Use of alternative cables may render the unit unsafe WARNING The IEC mains connecting cables must be protected with the maximum fuse ratings shown in the product brochure WARNING The DAS1 must be operated from an AC mains electricity supply as specified in gt in the product brochure Page 5 of 47 OM2201 5 BARTINGTON INSTRUMENTS WARNING This unit is not sealed against the ingress of water and should be operated only under dry conditions 3 Compatible Magnetometers The DAS1 is designed to be compatible with the sensors shown on the Product Compatibility page of the Bartington Instruments website at www bartington com product compatibility html 1 Caution Use of incompatible sensors may cause damage to the DAS1 and or the sensor 4 Introduction to the DAS1 4 1 Summary The DAS1 Magnetic Range Data Acquisition System is a complete digital hardware solution for data collection and processing from large arrays of magnetometers e g a marine signature range When used with compatible Bartington Instruments sensors the DAS1 provides all the required power anti alias filtering and analogue to digital A to D conversion The DAS1 CPU performs basic data processing and display using software supplied with the system Where additional data processing is required users can run their own software on the system or the DAS1 can be connected to an ethernet network to transfer d
42. w to collect and process data recorded by the system 6 2 2 User designed Software Section 7 Decaport Interface Module Technical Reference provides programming details for controlling the Decaport functions using your own software The reference manual uses standard PXI notation read it in conjunction with the LabVIEW technical manuals from National Instruments Section 9 Software User Manual provides useful background information for your own design 7 Decaport Interface Module Technical Reference The Decaport module provides several functions associated with powering controlling and conditioning signals from the attached magnetometer sensors Most of the functions can be controlled via digital input signals to the Decaport The main functions are e power to sensors on off and voltage high low control e sensor analogue input type balanced unbalanced selection control e analogue outputs to the A to D module e sensor test signal normal test state control e low pass filter corner frequency control e power supply monitoring sensor selection control e cable leakage test initiate test control Page 12 of 47 OM2201 5 BARTINGTON INSTRUMENTS 7 1 Interface and Control Internally the Decaport has two identical five sensor channel input modules each using one of the connectors on the PXI card The I O lines are all used as control inputs to the Decaport These are all standard 5V TTL logic inputs All the inputs
43. wn mains cable A WARNING If your mains power supply arrangement does not provide appropriate earth grounding connect the Decaport Earth Terminal Posts see Section 4 3 Decaport Features the PXI Chassis Earth Terminal Posts see Section 4 4 PXI Chassis Features and the 19 rack metalwork to a permanent earth ground point using 16 AWG 1 3mm wire with a grounding lugs If in doubt consult Bartington Instruments 6 Using the DAS1 System 6 1 Switching the Equipment On and Off Use the following sequence for powering up the various components of a DAS1 based system 1 If your system includes one power up your remote control computer 2 Power on the PXI chassis using the ON OFF switch on the front lower left corner Page 11 of 47 OM2201 5 BARTINGTON INSTRUMENTS 3 Power on the Decaport s using the ON OFF switch es on the right of the front panel see Figure 1 Decaport front panel 6 2 Operating the System Details of operation vary greatly depending on the configuration of your system and in particular the exact software that you will be using 6 2 1 Standard DAS1 Software To use the DAS1 data capture and storage software supplied with the standard system see Section 7 Decaport Interface Module Technical Reference describing the features and functions within the DAS1 Decaport Interface unit and Section 9 Software User Manual describing how you can use the software to control these functions and also ho
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