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Contents

SCXI-1530/1531 User Manual

viii

www.ni.com

LabVIEW and the SCXI Channel String.......................................... 2-8
LabVIEW and the Virtual Channel String ....................................... 2-9
Performing a Multiplexed Scan Using SCXI or

Virtual Channel Strings ................................................................. 2-10

C and Low-Level DAQ Functions.................................................... 2-11

Operating in Parallel Mode ........................................................................................... 2-11

Theory of Parallel Hardware Operation.......................................................... 2-11
Using Software for Parallel Scanning ............................................................. 2-12

LabVIEW and Parallel Mode ........................................................... 2-12
C and Parallel Mode ......................................................................... 2-12

Calibration ..................................................................................................................... 2-13

Calibration Procedures .................................................................................... 2-13

Internal Calibration........................................................................... 2-13

Appendix A
Specifications

Appendix B
Common Questions

Appendix C
Technical Support Resources

Glossary

Index

Figures

Figure 1-1.

Installing the SCXI-1530/1531 Module................................................ 1-3

Figure 1-2.

Connecting an SCXI Chassis to a DAQ Device ................................... 1-5

Figure 1-3.

Removing the SCXI-1530/1531 ........................................................... 1-13

Figure 2-1.

Typical Current-Excited Accelerometer ............................................... 2-2

Figure 2-2.

SCXI-1530/1531 Module Block Diagram ............................................ 2-3

Figure 2-3.

SCXI-1530/1531 BNC Connector Assignments .................................. 2-4

Figure 2-4.

SCXI-1530/1531 Rear Signal Connector.............................................. 2-7

Содержание SCXI-1530

Страница 1: ...SCXI SCXI 1530 1531 User Manual ICP Accelerometer Conditioning Module SCXI 1530 1531 User Manual June 2000 Edition Part Number 322642A 01...

Страница 2: ...ermany 089 741 31 30 Greece 30 1 42 96 427 Hong Kong 2645 3186 India 91805275406 Israel 03 6120092 Italy 02 413091 Japan 03 5472 2970 Korea 02 596 7456 Mexico D F 5 280 7625 Mexico Monterrey 8 357 769...

Страница 3: ...follow the National Instruments installation operation or maintenance instructions owner s modification of the product owner s abuse misuse or negligent acts and power failure or surges fire flood acc...

Страница 4: ...ions Commission FCC and the Canadian Department of Communications DOC Changes or modifications not expressly approved by National Instruments could void the user s authority to operate the equipment u...

Страница 5: ...uilleur du Canada European Union Compliance to EEC Directives Readers in the EU EEC EEA must refer to the Manufacturer s Declaration of Conformity DoC for information pertaining to the CE Mark complia...

Страница 6: ...n the software such as menu items and dialog box options Bold text also denotes parameter names italic Italic text denotes variables emphasis a cross reference or an introduction to a key concept This...

Страница 7: ...guration and Self Test 1 7 Auto Detecting Modules 1 8 Manually Adding Modules 1 9 Configuring the SCXI 1530 1531 1 10 Self Test Verification 1 11 Troubleshooting Self Test Verification 1 11 Removing t...

Страница 8: ...e 2 12 C and Parallel Mode 2 12 Calibration 2 13 Calibration Procedures 2 13 Internal Calibration 2 13 Appendix A Specifications Appendix B Common Questions Appendix C Technical Support Resources Glos...

Страница 9: ...Contents National Instruments Corporation ix SCXI 1530 1531 User Manual Tables Table 2 1 Gain Values and Input Limits 2 14 Table B 1 Digital Signals on the SCXI 1530 1531 B 3...

Страница 10: ...The SCXI 1530 1531 provides four or eight BNC connectors to interface with accelerometers This module supports both multiplexed and parallel output modes Installing the Software explains how to insta...

Страница 11: ...1 for use with an SCXI chassis and National Instruments DAQ device Unpacking Your SCXI 1530 1531 module is shipped in an antistatic package to prevent electrostatic damage to the module Electrostatic...

Страница 12: ...SCXI 1530 1531 module into a chassis that is turned on 3 Insert the SCXI 1530 1531 into an open slot in the SCXI chassis Gently guide the module into the slot guides and push it to the back of the sl...

Страница 13: ...y other SCXI modules should already be installed in the chassis according to their installation instructions You must select one of the analog input modules in the chassis as the cabled module which i...

Страница 14: ...n SCXI Chassis to a DAQ Device Connecting the SCXI 1530 1531 to a DAQ Device for Multiplexed Scanning in a PXI Combination Chassis With this configuration you can multiplex all four or eight channels...

Страница 15: ...most slot of the PXI combination chassis configure the system as described earlier in Connecting the SCXI 1530 1531 to a DAQ Device for Multiplexed Scanning in an SCXI Chassis 2 Turn on the SCXI chas...

Страница 16: ...ules used for parallel mode operation by repeating steps 2 through 4 6 Check the installation making sure the cable is securely fastened at both ends 7 Power on the SCXI chassis 8 Power on the compute...

Страница 17: ...and Interfaces and are using an E Series or 1200 Series DAQ device you can automatically detect the modules Go to Auto Detecting Modules to continue the software configuration of your chassis If the c...

Страница 18: ...ll in the Chassis Configuration window select No under Auto Detect modules and click Finish Use the following steps to manually add modules 1 If you have not already done so click next to the Devices...

Страница 19: ...display the list of modules in the chassis 4 Right click the SCXI 1530 1531 module to configure and select Properties Click the General tab a If the module you are configuring is connected to a Nation...

Страница 20: ...ake the following steps to successfully complete system configuration 1 If you get the warning message Unable to test chassis at this time you have not connected at least one module to a DAQ device Re...

Страница 21: ...rear connectors d Reinstall the module as described in Installing the SCXI 1530 1531 Module into the SCXI Chassis e Ensure the module is fully inserted and properly aligned in the slot 5 Return to Sel...

Страница 22: ...adding or removing any signals from the SCXI module or terminal block 2 Remove any accelerometer cables connected to the SCXI 1530 1531 3 Turn off the SCXI chassis power Do not remove the SCXI 1530 1...

Страница 23: ...d from the list of installed devices in Measurement Automation Explorer Safety Information The following paragraphs contain important safety information concerning hazardous voltages and hazardous ope...

Страница 24: ...eturn the module to National Instruments for service and repair to ensure that its safety features are not compromised Do not operate this equipment in a manner that contradicts the information specif...

Страница 25: ...case a free floating seismic mass and a piezoelectric crystal between the case and mass When the system undergoes an acceleration the crystal is either stretched or compressed This strain on the cryst...

Страница 26: ...th ground referenced and non referenced accelerometers The incoming signal is AC coupled to a programmable gain instrumentation amplifier This amplifier boosts the incoming signal by a gain of 1 10 or...

Страница 27: ...nced transducers Independently program the AC coupled amplifiers to different gains to extend the range of usability for a given accelerometer Configure the lowpass filter of each channel to one of fo...

Страница 28: ...31 are made through the front BNC connectors The channel assignment for the SCXI 1530 1531 front BNC connectors is shown in Figure 2 3 Figure 2 3 SCXI 1530 1531 BNC Connector Assignments SCXI 1530 4 C...

Страница 29: ...fier that can be a noise source Current Excitation Configure current excitation to 4 mA when using ICP or similar accelerometers or when using a transducer that requires a 4 mA excitation current Conf...

Страница 30: ...on When you configure a module for multiplexed mode operation the multiplexed signals routed to the DAQ device depend on which module is cabled to the DAQ device in the SCXI system If the module being...

Страница 31: ...ols which module sends its output to the SCXIbus during a scan You can make this list scan the modules in the chassis in any order with an arbitrary number of channels for each module entry in the lis...

Страница 32: ...iscussion describing how to implement multiplexed scanning in the different ADEs follows See your ADE manual and the DAQ analog input examples provided with your application software for more detailed...

Страница 33: ...ng format is not supported on all SCXI modules Note Repeating channels or having channels out of sequence in a scan list is not supported on all SCXI modules Please refer to the manual of each module...

Страница 34: ...u can enter virtual channels in any order or repeat them in the channel string Performing a Multiplexed Scan Using SCXI or Virtual Channel Strings To perform a multiplexed scan in your application per...

Страница 35: ...scan This number must match the total number of channels programmed in step 2 4 Use the NI DAQ SCXI_Track_Hold_Setup function to setup the origin and destination of the track and hold signal You are...

Страница 36: ...ode in Measurement Automation Explorer as described in Configuring the SCXI 1530 1531 of Chapter 1 Installing and Configuring the SCXI 1530 1531 LabVIEW and Parallel Mode In LabVIEW the SCXI 1530 1531...

Страница 37: ...0 1531 make sure the DAQ device you are using was recently calibrated or you will invalidate the calibration on the SCXI 1530 1531 To perform internal calibrations see the Internal Calibration section...

Страница 38: ...u are using has a valid calibration and meets the accuracy specifications for your application 2 Use the NI DAQ function SCXI_Calibrate to calibrate one channel of the SCXI 1530 1531 a Enter the DAQ d...

Страница 39: ...ier input impedance both powered on and off 1 M Amplifier coupling AC Accelerometer input excitation current 4 mA 10 24 V compliant Current source drift 2 5 A C max Current source dynamic impedance 40...

Страница 40: ...t 10 ppm C max Gain accuracy 0 5 before calibration 0 03 after calibration at 400 Hz and BW of 20 kHz Interchannel gain error Interchannel phase error Nonlinearity 0 004 of FSR max Frequency Gain Erro...

Страница 41: ...d Hold Acquisition time 7 s max Hold mode settling time 1 s max Hold step 5 mV typ Droop rate 30 mV s max Interchannel skew 100 ns Physical Dimensions 3 0 by 17 3 by 24 4 cm 1 2 by 6 8 by 8 0 in Front...

Страница 42: ...dance with IEC 61010 1 UL 3111 1 and CAN CSA C22 2 No 1010 1 for electrical measuring and test equipment Approved at altitudes up to 2000 meters Installation Category II1 Pollution Degree 2 1 Category...

Страница 43: ...evice is available for use by all simultaneous sampling SCXI modules in the chassis Can I use the SCXI 1530 1531 with any current excited accelerometers not just ICP accelerometers Yes subject to the...

Страница 44: ...est and verify that my SCXI 1530 1531 is working What should I do now Unfortunately there always exists the chance that something is not operating correctly in your system or the combination of the co...

Страница 45: ...Since these modules support parallel mode the rear signal connector of the SCXI 1531 modules drives all eight differential input channels on a 68 pin E Series DAQ device This is true even if the modul...

Страница 46: ...meter cables Use the coaxial cable recommended by the accelerometer manufacturer How do I calculate the maximum permitted scan rate when using one or more SCXI 1530 1531 modules in multiplexed mode Th...

Страница 47: ...ns FAQs and their corresponding answers or solutions including special sections devoted to our newest products The database is updated daily in response to new customer experiences and feedback Troubl...

Страница 48: ...nformation on local services You can access these Web sites from www ni com worldwide If you have trouble connecting to our Web site please contact your local National Instruments office or the source...

Страница 49: ...alternating current accelerometer a transducer that converts acceleration into a voltage or current AC coupled allowing the transmission of AC signals while blocking DC signals acquisition time the t...

Страница 50: ...induced offset voltage errors B bandwidth the range of frequencies present in a signal or the range of frequencies to which a measuring device can respond Bessel filter a lowpass filter whose charact...

Страница 51: ...2 for signals in volts DC direct current DC coupled allowing the transmission of both AC and DC signals differential input the two terminal input to a differential amplifier DIGGND digital ground sign...

Страница 52: ...ode settling time the time it takes for a sample and hold circuit to switch from sampling tracking mode to hold mode and settle within a given percentage at the true hold value hold step the differenc...

Страница 53: ...el terminal for channel x MCHx positive analog output channel terminal for channel x min 1 minutes 2 minimum MIO multifunction I O MSB most significant bit multiplexed mode an SCXI operating mode in w...

Страница 54: ...made with respect to a common measurement system reference but the voltage at this reference can vary with respect to the measurement system ground O offset error the output of a system with a zero v...

Страница 55: ...one pulse from the scan clock produces one scan which acquires one new sample from every analog input channel in the group SCANCLK clock that triggers scanning scan interval accuracy the minimum inte...

Страница 56: ...tes a measurable physical quantity into a voltage or current signal typ typical U UL Underwriters Laboratory V V volts VDC volts direct current VI virtual instrument 1 a combination of hardware and or...

Страница 57: ...to 1 12 auto detecting modules 1 8 to 1 9 common questions B 2 to B 3 configuration reconfiguration 1 10 manually adding modules 1 9 to 1 10 self test verification 1 11 steps for 1 7 to 1 8 troublesh...

Страница 58: ...uration reconfiguration 1 10 manually adding modules 1 9 to 1 10 removing SCXI 1530 1531 1 14 self test verification 1 11 troubleshooting 1 11 to 1 12 multiplexed scanning 2 6 to 2 11 channel scanning...

Страница 59: ...SCXI 1530 1531 module B 2 SCXI 1530 1531 accelerometer design 2 1 to 2 2 block diagram 2 3 calibration 2 13 to 2 14 common questions B 1 to B 4 configuration and self test 1 7 to 1 12 digital signals...

Страница 60: ...1530 1531 with transducers B 1 troubleshooting incorrect test and verification B 2 self test verification 1 11 to 1 12 U unpacking SCXI 1530 1531 1 2 V virtual channel string 2 9 to 2 10 VirtualBench...

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