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XM User Manual - July 2004

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1. If the installation application was able to locate a LabVIEW installation on your computer the Acquitek VIs have been installed into the LabVIEW directory and can be accessed from the LabVIEW function palette by choosing the Acquitek Data Acquisition palette view If a LabVIEW installation was not detected manual installation can be completed by copying the XDADaqLV and Menus directories from the installdir ThirdParty LabVIEW directory into the main LabVIEW installation directory the directory containing LabVIEW exe A number of sample VIs are included and can be found in the installdir ThirdParty LabVIEW Samples directory These samples demonstrate wiring of the API level VIs and can also be used as higher level building blocks within new LabVIEW applications The first time you attemptto open one of the samples from the installdir ThirdParty LabVIEW Samples subdirectory LabVIEW will not be able to find the AcquitekDA VIs used by the sample You can either browse to the correct LabVIEW_Install XDADaqLV directory using the find vi dialog displayed by LabVIEW while loading the sample or you can permanently fix the problem for all samples by opening the LabVIEW Tools Options menu selecting Paths and VI Search Path then entering LabVIEW Install XDADaqLVV and clicking Insert Before Note LabVIEW_Install should be replaced by the actual name of the directory where LabVIEW is installed on your syste
2. Correspondingly Acquitek XM series PXI boards are very similar to the CM series PCI boards however the XM series boards implement a subset of the PXI extensions which are also detailed below PXI Extensions In addition to the enhanced mechanical ruggedness inherent in the PXI form factor PXI extends the PCI electrical interface in four primary ways to benefit system designers using the PXI bus Star Triggers Slot number two which is immediately to the right of the controller slot in the PXI chassis is defined as the Star Trigger Controller slot From this slot a dedicated individual connection is available to each of up to thirteen peripheral slots in the PXI chassis Each peripheral slot has a dedrated Star Trigger pin from which the peripheral can receive or generate unique triggers from to the Star Trigger Controller The signal level on the Star Trigger line must be 5V or less Since the driver of the Star Trigger line is not specified both the controller and peripherals must not drive the line at power up A pull up resistor is allowed on peripherals to prevent an indeterminate electrical state Bussed Triggers Eight general purpose lines are available which are shared among all slots on the PXI bus segment Signaling on these lines must be at TTL levels Since there is no specified driver on these lines all peripherals must set these lines at high impedance upon power up Local Bus Adjacent peripheral slots are
3. Flexible Triggering Modes Up to 2 Output Channels Waveform Quality Up to 1 MS s D A Converter per Channel 16 Bit D A Resolution Up to 16 MB 8 MSample Local Waveform Memory 1 Hz Sample Clock Resolution from onboard DDS 16 32 Digital I O s synchronous with analog I O Up to 3 Counter Timers PCI Bus Mastering Transfers Onboard 143 MHz 32 Bit DSP for Real Time Processing and Control Windows 98 Me 2000 XP XM Series Product Line XM Series 250 kHz 1x 2x 4x 8x Gain XM 2320 XM 2310 XM 2350 XM 2340 16 analog in 16 digital I O 2 analog outputs 250 kHz 16 analog in 16 digital I O O analog outputs 250 kHz 32 analog in 32 digital I O 2 analog outputs 250 kHz 32 analog in 32 digital I O O analog outputs 250 kHz XM Series 250 kHz High Gain 1x 10x 100x 1000x Gain XM 2321 XM 2311 XM 2351 XM 2341 16 analog in 16 digital I O 2 analog outputs 250 kHz 16 analog in 16 digital I O O analog outputs 250 kHz 32 analog in 32 digital I O 2 analog outputs 250 kHz 32 analog in 32 digital I O O analog outputs 250 kHz XM Series 1 MHz 1x 2x 4x 8x Gain XM 2420 XM 2410 XM 2450 XM 2440 16 analog in 16 digital I O 2 analog outputs 1 MHz 16 analog in 16 digital I O 0 analog outputs 1 MHz 32 analog in 32 digital I O 2 analog outputs 1 MHz 32 analog in 32 digital I O O analog outputs 1 MHz XM Series 1 MHz High Gain 1x 10x 100x 1000x Gain XM 2421 XM 2411 XM 2451 XM 2441
4. r Taba Lae fuma iid e D 4 tw is a mn ine Ores Loge e a he gas Lo s Lem Ts E JAS o AIN E reser Le The Configuration Tab is only available when an Acquitek hardware device is selected in the System Tree Pane This page is used to set the logical device number for Acquitek devices to be used by other software applications The PXI Configuration panel will only be displayed when an Acquitek PXI device is selected The checkboxes are used to enable various PXI specific outputs on these boards It is very important that you know and understand the PXI system configuration before enabling any outputs Driving one of the PXI output lines in a mis configured system could damage the Acquitek hardware device or one of the other system devices See PXI Implementation Details in Section 3 of this manual for an explanation of the PXE specific signals and information on how those signals are connected on the XM Series boards XM Series User Manual Page 36 Test Tab Acquitek Control Center Ble Edt Mas Hap Configuration F L Local Sytem Info Configure Test BRHadsere EPPA ccuites Analog Input GP A E 25 AA KEE Channel o 23 Range 10 00 to 10 00 Mode Dilferential ER System SP FN MEDALEN NEA 48005 2 CPU to F ME 224420 4408024 PO to l 62971 EBB PIKJEM ISA Bride SSSI AB EB MB PIDA dE JM EID TIAB BAMEB PIDA E JM USE MB FIBSAN Paver Managua WC peral 054281 Seurdfusion PEI Mi de
5. A QUITEK As shown in Figure 3 11 the analog inputs and counter timers can be driven from an external clock The external clock source must be a TTL compatible square wave The analog input section shares its external clock source with Counter Timer 2 on XM 24xx boards On XM 23xx boards with only two counter timers the analog input external clock is not shared It must still be applied to the connector pin labeled Cntr2 Clk In external clock mode the analog input sample rate is equal to the external clock frequency divided by 64 This factor is required for the pipeline delay of the A D converter and the trim DACs which calibrate the analog input on a sample by sample basis according to the range setting in the channel gain list In internal clock mode the counter timers run off a clock that is an integer multiple M of the analog input sample rate Again M is large between 40 and 64k to facilitate the analog input pipeline The Acquitek Data Acquisition SDK has documentation on the functions used for programming the clock sources and frequencies XM Series User Manual Page 25 CQUITEK Accessories There are several accessories available to simplify connecting signals to and from the XM Series boards All XM Series boards use a VHDCE68 female connector as the main signal connector The analog inputs 0 15 digital I O Ports A and B the analo g outputs if applicable and timing and reference signals are available on this connector The Acqui
6. Ac quit k Control Center WEE PEM ISA Back RET ABA ME PRA E AM ED EITT VAR B ME PIDE AM US ETT NN PINE Porem Manager egen CQUITEK SPA TX Fan Eire toe PCP rege 2100 Laptop regaad k WE age PAA Moby AGP 2x Web AQ Boss Deno Acquitek Control Center ECC provides a central location for the configuration and test of data acquisition products from Acquitek ECC is used to assign logical device numbers to Acquitek hardware devices so that those devices can be accessed from other software applications ECC can also be used to specify default configuration parameters for Acquitek hardware devices and to verify correct installation and operation of those devices XM Series User Manual Page 31 A QUITEK Menu and Toolbar Acquitek Control Center File Edit Yiew Help Hale File Load Profile Loads a previously saved set of configuration data making those settings active File Save Profile Save the current configuration settings for all Acquitek devices to a named file File Exit Exit Acquitek Control Center Edit Preferences Set general application preferences including whether to scan hardware and software each time Acquitek Control Center is started View Refresh Scan the system for installed hardware and software Help Contents View help for Acquitek Control Center Help Acquitek Web Site Open the Acquitek home page in a default browser window Help About Display version and copyright information f
7. Setup This application can be used to verify basic functionality XM Series User Manual Page 61 CQUITEK ExcelDA Microsoft Excel Add In ExcelDA is a Microsoft Excel Add In that enables data acquisition from within Excel using any Acquitek hardware device It is included with all Acquitek products and installed into the ThirdParty directory when Acquitek Data Acquisition Setup is run Installation To Install ExcelDA follow these steps e Start Microsoft Excel e Choose Add Ins from the Excel Tools menu e Click the Browse button on the Add Ins dialog e Navigate to AcquitekInstallDirectory ThirdParty ExcelDAL e Double click ExcelDA xla e Click the OK button on the Add Ins dialog e Choose ToolBars from the Excel View menu e Select Acquitek Data Acquisition from the ToolBars list Once you have completed these steps the Acquitek Data Acquisition toolbar will be available for use with any workbook within Excel You can drag and dock the toolbar to a convenient spot on the Excel toolbar or let it float within the work area as you prefer XM Series User Manual Page 62 Ae QUITEK General Configuration ExacqXL Settings x General Analog In Device Number 1 Target workbook Booki Worksheet Sheet1 Column A Row 1 Display the General Configuration tab on the configuration dialog by clicking Configure on the Acquitek Data Acquisition toolbar then choosing the Gen
8. is controlled through the SDK in a similar manner as other trigger sources Bussed Triggers XM series boards can drive or receive digital trigger signals on the Bussed Trigger 7 line This line powers up in a high impedance state It functions similarly to any of the other triggers available on the main 68 pin I O connector The XH series boards make no connection to PXI bussed trigger lines 6 0 Local Bus XM series boards do not use the Local Bus Left lines however since an XM series board can be a Star Trigger Controller it clearly makes connections to the LBL lines which double as the Star Trigger lines in the Star Trigger Controller slot Slot 2 However the XM board powers on with the LBL lines in a high impedance state and commands to drive these lines will fail unless the board is located in Slot 2 XM series boards make no connection to any Local Bus Right lines XM Series User Manual Page 29 CQUITEK Synchronizing Clock XM series boards can receive the 10MHz PXI clock from the backplane and use it to generate the sampling clock for the analog input A D converter and the analog output D A converter An XM series board in the Star Trigger slot is also capable of driving a reference clock onto the backplane A properly designed backplane will then override its internal 1OMHz clock and distribute the clock signal driven in from the Star Trigger slot With the fine frequency resolution available from the XM clock gene
9. must flow through the instrumentation amplifier inputs The input bias current is a measure of the extent to which the instrumentation amplifier will disturb the inputs to be measured with a smaller bias current causing less disturbance A practical instrumentation amplifier will also have an offset voltage which is present at the output when the difference between the inputs is zero Calibration of this offset voltage along with external nulling circuitry can eliminate this offset prior to analog to digital conversion Multiplexer A device with several inputs and one output External controls cause the desired input to be connected to the output In a multifunction board the multiplexer can operate at high speed to allow many inputs to be measured with a single instrumentation amplifier and analog to digital converter Mux Multiplexer Noise Any undesired modification of a signal is called noise Unfortunately everything adds noise to a signal but some components or systems add more than others The noise can be thermal noise which is caused by the random motion of charge carriers in conductors or semiconductors This random motion increases as temperature increases hence the name thermal noise The noise can also be from interference leaking into a signal from other circuitry In particular high speed digital circuitry is prone to corrupt analog signals Quantization is another type of noise imparted by the conversi
10. pA 40 55V 10 V 4 pC 2 uS 10 US on range 3 1000 kHz 1000 kHz 1000 kHz 250 kHz 2 5 LSB 2 5 LSB 3 LSB 7 5 LSB 28 LSB Analog Inputs cont d XM 23x0 XM 24x0 XM 23x1 XM 24x1 Accuracy 1 year range 0 polarity 0 3 175 mV 3 1805 mV 4 89663 mV 4 81565 mV at full scale for range range 1 polarity 0 1 71 mV 1 7155 mV 1 22078 mV 1 22395 mV 10C from cal temp range 2 polarity 0 0 985 mV 0 983 mV 0 91231 mV 0 91928 mV 100 samples avg range 3 polarity 0 0 618 mV 0 6167 mV 0 91288 mV 0 93796 mV range 0 polarity 1 2 587 mV 2 5895 mV 4 15098 mV 4 21791 mV range 1 polarity 1 1 406 mV 1 4091 mV 1 13872 mV 1 14952 mV range 2 polarity 1 0 82 mV 0 819 mV 0 88945 mV 0 89719 mV range 3 polarity 1 0 524 mV 0 5239 mV 0 89414 mV 0 9172 mV Gain Stability typical range 0 3 ppm C 3 ppm C 5 ppm C 5 ppm C range 1 3 ppm C 3 ppm C 5 ppm C 5 ppm C range 2 3 ppm C 3 ppm C 42 ppm C 42 ppm C range 3 3 ppm C 3 ppm C 102 ppm C 102 ppm C Clock Source internal lt 1 Hz resolution on sampling clock Data Transfer Mod es DMA SG SG SG SG PIO Yes Yes Yes Yes Channel gain list 64k 64k 64k 64k FIFO size lt 4M lt 8M lt 4M lt 8M Analog Outputs XM 23xx XM 24xx Number of Output Channels 2 2 Resolution 16 bits 16 bits Maximum Update Rate 250 kHz 1000 kHz FIFO Size lt 4M samples lt 8M samples Data Transfer Modes DMA Scatter Gather Scatter Gather PIO Yes Yes Relative Accuracy INL typical 0 5 bits 0 5 bits max 4 bits 4 bit
11. system ground and the pseudodifferential input is therefore useful for preventing ground loops In a multichannel system many pseudodifferential inputs may share the same reference input while it is common to the inputs it is still isolated from system ground Quantization noise Because of the limited number of bits available in a practical A D the digital output of the A D does not exactly represent the input analog voltage In an ideal A D the quantization noise is on average equal to the voltage represented by of the least significant output bit Quantization noise can usually be effectively modeled as flat frequency spectrum between 0 and 1 2 the sampling frequency i e the Nyquist Frequency Quantization noise improves by 6 dB for every bit in an A D Reconstruction filter Also known as a smoothing filter A D A converter typically operates by generating a voltage proportional to a digital value and holding that voltage constant for a time period equal to the 1 sample rate This operation known as a zero order hold has consequences in the frequency spectrum of the analog signal output from the D A converter Specifically the desired frequency spectrum of the D A output is replicated at every integer multiple of the D A sampling frequency Fs A reconstruction filter smoothes the D A output in the time domain or attenuates the undesired replicas of the output signal at higher order multiples of the D A sample rat
12. 23 CIOCKING EE 24 E smake ne Greide mikser 26 PXI Implementation DetailsS rrreennnnvennnnennnnnnnnnnnnnnnnnnenennnnnnnnnnennnnnnevnnvennnnnernnnnnnnnenee 28 PXI Extensions A ea 28 XM Series PXI Implementation rnnnnnnnnnrnnnnnnnnvvennnnnnnnvvnennnnnnnnnnnnnnnnnnnnnnnnnnnneennnnevennnner 29 2 ACquitek Control in E 31 Menut and Toolbar isc i i a ee ee EAR 32 System Trees A dienei ieee a Annaan Eear E aeaaea naaa e Eea oioi atana i eaaa a eai Ea 33 Configuration Pane E 34 TO EN A iv Deine A Lele cede eee es 35 Contig uitation Tab E 36 LETTRE EE 37 a 38 Menu and TODA a A Ai 39 EE gege Sege a aan 41 eet Dal Metteg 42 Volt Melero a A Ee EENS iy 45 ee E 47 LEE 50 Strip Chart Recordet cio ii Diaz 52 Wave Form Generator ii ini 54 6 XM Series Third Party Drivers s ssvvenvsennnnennvnnnennennnnvnnnnnsennnnnnnennnennennnnnnnnnennvne 56 PAD VIEW NT 56 MATLAB EE 58 OST TE 60 ExcelDA Microsoft Excel Add In anannernannennnnnnnnnnnnnnnnnnennnnnennnnnnnnnnnnnnnnnnennnnennnnnenenn ener 62 DAS YLE AA Le et 67 7 XM Series Technical Specifications rsrnnrnnnennvnnnnenennvnennvnnnnenenennennnnenennenennene 71 8 XM Series Cables amp Connectors Optional xeravvnnvavnnvnnvnnvnnnnvnnvnnnnnvnennnnnnr 75 Qi CNS A tata tetera tec ecereruceceeencecuatata Matec actec eeu cerecer ues wea earenactce ee cesta ae weucer ea 77 10 TSS Fai ASU POM EE 82 Introduction The Acquitek XM Series of mul
13. Acquisition x X 24 Configure 4 Acquire kd amp Configure Acquire Once all data acquisition parameters have been set using the configuration dialog simply click the Acquire button on the Acquitek Data Acquisition toolbar to acquire data directly into your Excel spreadsheet If you have specified a non existent target for acquisition or your configuration parameters are otherwise incorrect an error message will be displayed You can then click Configure again to display the configuration dialog and correct the problem XM Series User Manual Page 66 AQQUIER DASYLab ET DASYLab7 Net ain dsb Worksheet File Edit Modules NI DAQ Experiment View Options Window Help pju a Dele S r Be Fle e ca se Jel AO KOS KAOS 50 SS ms gt Oo vum v DASYLab is an easy to use Windows based graphical data acquisition software package with which you build data acquisition and control applications more quickly By using an icon based flowchart you develop your application with point and click ease no programming required Installing the Acquitek DASYLab Driver 1 Copy XDADASY dll from the installdir YThirdPartADAS YLab folder most likely CAProgram Files Acquitek ThirdParty DAS Y Lab to DASY Lab s root folder most likely CAProgram Files DAS Y Lab 2 Open DASYLab XM Series User Manual Page 67 CQUITEK 3 Choose Select Driver from the Experiment menu in
14. Acquitek XM Series Multifunction Analog I O Boards for PXI User Manual July 2004 Information in this document is subject to change without notice Copyright 2004 Acquitek SAS All rights reserved CQUITEK Acquitek is a trademark of Acquitek SAS Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products Acquitek disclaims any proprietary interest in trademarks and trade names other than its own Acquitek makes no warranty of any kind with regard to this material including but not limited to the implied warranties of merchantability and fitness for a particular purpose Acquitek shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing performance or use of this manual Acquitek SAS 12 avenue des pr s Montigny le Bretonneux 78059 Saint Quentin en Yvelines France Acquitek XM Series Multifunction Analog I O Boards for PXI TABLE OF CONTENTS huktrodudetom SR 5 EH EE Eege Eeer efe sn 6 XM Series Product Lines ee ih ees ies eee 7 Al la EE E 8 XM Series Installation sss cc evict eae sees aaa vetoes stent eae 8 S Hardware e UE EE EE 10 Hatdware Overview neger ENNEN GAEREN EEN EE EENS 10 L TEE 12 Analog Re 13 EA ies aaee nena ieat arrr EE Er Enae OEE aaa aretara ERa tera EAr a Eai 21 RT e EE 21 GounterTime rs iii eege eege a A A Aa da eeh ENEE ees d 22 ge EE
15. C DIV Position Pre Capture Post Capture s AN voltsoiv EE Position 44 0 EI Coupling DC ead Y Visible Ref Line mite Digital in Lines Samples Second io Wo wl M2 M3 M4 M5 jw E M7 Device Number hn B E 3 The Logic Analyzer is used to capture and inspect logic level OV 5V signals using the digital IO lines SEC DIV Specify the number of seconds per division on the Horizontal Axis Display Position Time Base Specify the vertical offset of the entire channel in percent of the Display Pre Capture Specify how much data to capture before the beginning of the display The value is specified in divisions of the horizontal axis XM Series User Manual Page 42 Aar Post Capture Specify how much data to capture after the end of the display The value is specified in divisions of the horizontal axis Level Specify the level where the trigger mechanism will trigger a new frame to be displayed Source Specify the channel index used as the data source by the Trigger Slope Specify whether a positive or negative slope is used when triggering Auto Specify whether the Trigger is Automatic or Manual If this value is FALSE then you must manually evaluate the Trigger by pressing the trigger button in the Trigger section of the Scope Panel Volts DIV Specify the number of volts per division on the vertical axis display Position Channel Specify the vertical offset of the entire channel i
16. DASYLab 4 Find XDADASY dll in this dialog box Highlight it and click OK If XDADASY dll does not show up in this dialog the file may be in the wrong place Make sure you have completed step 1 correctly 5 DASYLab will inform you that you must restart DASYLab for the changes to take effect Restart DASYLab The Acquitek DASYLab Driver should now be installed and can be accessed from the Input Output item in the Modules menu Adding Acquitek Driver Modules to your DASYLab Worksheet To add modules using the Acquitek DASYLab driver to your worksheet select Analog Input Analog Output Digital Input or Digital Output from the Input Output submenu of the Modules menu Selecting a Device To choose a device select Hardware Setup from the Experiment menu Choose a device number as defined in Acquitek Control Center and click OK XM Series User Manual Page 68 CQUITEK Setting up Triggering E DASYLab7 Net ain dsb Worksheet File Edit Modules NI DAQ Experiment View Options Window Help ml fm oele mise 2 7 8 ee se el Analog Trigger Type None X Trigger Channel fo Trigger Channel J Trigger Volts 0 000 Trigger Volts FalingEdge Rising Edge Faling Edge Rising Edge Set up digital trigger Evaluation copy not for resale M 5 04 27 pm A To set up analog input triggering CM XM or CH XH or analog output triggering CH XH select Hardware Setup from the Exper
17. Excel limits this value to about 65000 Sample Rate The sampling clock frequency to be used for the acquisition Scan Rate The time between channel sample sets when using hardware that does not support simultaneous sampling Set this value to 0 when acquiring one channel or when you wish to use the frequency specified by Sample Rate Range The maximum voltage of the input signal Valid values for this parameter depend on the particular hardware device being used Please see the hardware reference manual for a list of valid values XM Series User Manual Page 64 CQUITEK Polarity Input signal polarity Bipolar or Unipolar Coupling Input signal coupling AC DC or DC Terminated Mode Input signal mode Differential Single Ended or Pseudo Differential Trigger Channel Analog channel used to trigger acquisition Trigger Level Voltage level at which data acquisition will trigger Trigger Type Trigger mode Falling Rising External or None To begin acquisition as soon as the Acquire toolbar button is clicked set this value to none Trigger Noise Reject Enable Trigger Noise Reject to avoid triggering on noise from the trigger input signal XM Series User Manual Page 65 CQUITEK Acquisition ES Microsoft Excel 5 x File Edit View Insert Format Tools Data Window Help Acrobat Dep ei zApea GX MB la z0 B z u gt e secunty AR L PERLER eee ts AR Al y Exacq Data
18. SSER gt Mode DESEN gt Samples Second boom B Analog In Channel o ER On Analog In Channel m Dn EE B The Spectrum Analyzer is used to measure the frequency spectrum of a signal on an analog input channel Range Voltage range of signal under test Mode Analog input type differential 2 wire single ended 1 wire or nonreferenced single ended 1 wire Coupling Analog input coupling and impedance XM Series User Manual Page 50 Ages Analog In Channel Zero based analog input channel number Samples Second Input sampling rate Device Number Data acquisition device number as configured in Acquitek Control Center You must assign a device number to the acquisition board before it can be used in Acquitek Bench or other application software XM Series User Manual Page 51 CQUITEK Strip Chart Recorder Acquitek Bench File Edit Instrument Window Help pc IM Ed ai Strip Chart alal elle cn 7 Range GORI cy 2 Range BREEDE gt ay channe Mode EET gt Mode EEE Coupling Ls Courting as Probe Probe e Tx 10x 100x e Tx 10x 100x Disable strip plot scrolling I Ignore buffer overwrite errors Samples Second cue AA BEE File File Device Number Analog In Channel o B Analog In Channel ER on The Strip Chart Recorder is used to capture and save voltage levels from the analog input channels Range Voltage range of signal u
19. XM Series User Manual 16 analog in 16 digital I O 2 analog outputs 1 MHz 16 analog in 16 digital I O O analog outputs 1 MHz 32 analog in 32 digital I O 2 analog outputs 1 MHz 32 analog in 32 digital I O O analog outputs 1 MHz Page 7 Installation XM Series Installation To install the XM Series hardware and software complete the following steps Install the Acquitek Data Acquisition Hardware e Turn off your computer and disconnect the power cord Locate a free PXI expansion slot Carefully remove the card from its packaging Insert the card into the PXI expansion slot and activate the latch Reconnect the power cord Connect the Cables e Connect the IO cables to your external devices or breakout board Install the Windows Device Drivers e Turn on the computer e When Microsoft Windows boots it should discover the new device and launch the New Hardware Wizard e Insert the Acquitek Data Acquisition Setup CD into your CD ROM drive e Direct the New Hardware Wizard to search the CD ROM drive for the device drivers e Windows may warn that the drivers are not authenticated Proceed with installation e After the drivers are installed remove the CD and reboot your computer XM Series User Manual Page 8 C QUITEK Install the Application Software and Third Party Drivers e Insert the Acquitek Data Acquisition Setup CD into your CD ROM drive e Run Setup exe from the root directory of the CD e Follow the onscreen i
20. all best performance can be obtained by grounding unused inputs or capacitively coupling them to ground or to the reference in differential mode This will minimize any chance for crosstalk Additionally it is possible for noise on an unused unconnected input to saturate the instrumentation amplifier particularly in high gain applications The recovery time of the instrumentation amplifier from saturation is longer than normal switching time XM Series User Manual Page 13 Taking precautions not to leave unused inputs floating will minimize the chance that such an input could be selected inadvertently leading to unexpected saturation and issues with switching Signal Input Modes Three input modes are available to suit a variety of applications A knowledge of the analog input signal modes and operation will help in achieving the maximum performance in any application Single Ended In single ended mode the input voltage is measured with respect to system ground at the computer As shown in Figure 3 4 this can work well on a floating source Measured V d at A D Figure 3 4 Single Ended Floating Source However as shown in Figure 3 5 in the situation where the source is referenced problems may arise It is common for the source being measured to have a different reference potential than the measurement computer for example if they are powered from different circuits of the electrical distribution system In this c
21. an be useful in detecting glitches on a signal which is being sampled at a low rate relative to the glitch duration A D converter E Analog Trigger Figure 3 10 Analog Trigger Architecture As can be seen from Figure 3 10 analog output 1 is used to set the trigger level and thus can not be used as a general purpose output while analog triggering is operational Also on XM Series boards without analog outputs the analog trigger reference is connected to ground so the analog trigger becomes a zero crossing detector on such boards XM Series User Manual Page 23 A QUITE K The Acquitek software API implements all the necessary signal switching and register programming to make triggering work However it should be noted that both analog triggering methods A D value based and analog comparator based operate on the multiplexed signal If an input set as the trigger channel is not present in the input sequence it will never generate an analog trigger Clocking The clocking mechanism on the XM Series boards provides maximum flexibility to the user The architecture is shown in Figure 3 11 DDS N Analog 1 Hz Res Outputs 66 MHz Crystal Oscillator DDS 1 Hz Res C T 0 Ext EE C T 1 Ext E Counter Se D 1 1 C T 2 Ext a Counter ic ME KT Timer Independent Clk mux control M M gt 40 Analog Inputs Figure 3 11 CM Clock Architecture XM Series User Manual Page 24
22. ase the resulting voltage measured by the A D converter is Vsignal Vcm where Nom is the potential difference between the source ground and measurement computer ground This can easily be on the order of volts in a typical commercial setting and fluctuate as loads are connected or removed from the electrical distribution system XM Series User Manual Page 14 A QUITEK Measured V _at A D Wire Resistance Figure 3 5 Single Ended Referenced Finally as shown in Figure 3 6 even the simple floating source scenario shown in Figure 3 4 can result in measurement errors due to noise pickup This is because the signal line terminates in a high impedance PGIA input while the reference line terminates in low impedance ground The noise pickup will be far more severe on the high impedance signal line resulting in the measurement of Vsignal Vnoisepickup at the A D converter The noise pickup will be most severe in long cable runs and with high impedance sources A Measured V f at A D Figure 3 6 Single Ended Floating Source Noise XM Series User Manual Page 15 Ag QUITEK For the given considerations it is recommended that single ended mode only be used under the following conditions cable runs of less than 3 meters and signal levels of 1V or greater and common power ground between input source and measurement computer Differential Differential mode eliminates many of the problems
23. associated with single ended input mode As shown in Figure 3 7 a referenced source with a different reference potential than the measurement computer results in no measurement error when using differential mode Measured V d at A D Figure 3 7 Differential Referenced Source Also with differential mode measurement error due to noise pickup is also reduced as compared to the single ended case This is because both lines in the differential pair are terminated by a high impedance PGIA input As long as both lines pass through essentially the same electromagnetic fields which is the case when using twisted pair wires or wires in close proximity to each other the noise induced on each line will be the same The PGIA will reject the noise which is common to both lines of the differential pair When using differential mode with floating sources care must be taken to keep the floating source within the common mode range of the XM board and outside the range which will trigger the input protection circuitry on the input multiplexer XM Series User Manual Page 16 Ao QUITEK Please see the following sections regarding common mode range and input protection for details If these effects are problematic a simple solution is to connect a large value resistor from one of the source terminals to system ground as shown in Figure 3 8 below Assuming the differential voltage is within the XM range this will keep the common mode voltag
24. connected via thirteen wires to the left and thirteen wires to the right These Local Busses are general purpose and can be used for digital signals or analog signals up to 42V Since there is no specified driver on these lines all peripherals must have these lines at high impedance or ground upon power up From the Star Trigger Controller slot XM Series User Manual Page 28 CQUITEK which is leftmost in the chassis excluding the system controller slot the Left Local Bus lines are used to implement the Star Triggers Synchronizing Clock A 10 MHz reference clock is provided by the PXI backplane to all peripheral slots including the Star Trigger Controller slot From the Star Trigger Controller slot an external clock reference may be driven as a substitute for the backplane 10 MHz reference XM Series PXI Implementation Star Triggers XM series boards in the Star Trigger Controller slot can function as the system Star Trigger Controller The Star Trigger lines share circuitry with digital I O lines 16 31 Therefore the Star Trigger functions can not operate simultaneously with the digital I O lines 16 31 As the Star Trigger Controller the XM series board can issue triggers to or receive triggers from all thirteen peripheral slots as defined by the PXI Hardware Specification XM series boards in peripheral slots can receive triggers from the Star Trigger Controller to synchronize operations between boards This input trigger
25. d as the data source by the Trigger Slope Specify whether a positive or negative slope is used when triggering Auto Specify whether the Trigger is Automatic or Manual If this value is FALSE then you must manually evaluate the Trigger by pressing the trigger button in the Trigger section of the Scope Panel Volts DIV Specify the number of volts per division on the vertical axis display Position Channel Specify the vertical offset of the entire channel in Percent of the Display Coupling Specify the signal coupling of this channel Visible Specify whether the channel trace line is visible XM Series User Manual Page 48 CQUITEK Mode Analog input type differential 2 wire single ended 1 wire or nonreferenced single ended 1 wire Coupling Analog input coupling and impedance Probe Specifies a 1x 10x or 100x probe for scaling of display values Analog In Channel Zero based analog input channel number Device Number Data acquisition device number as configured in Acquitek Control Center You must assign a device number to the acquisition board before it can be used in Acquitek Bench or other application software Note Additional configuration options can be accessed by right clicking on the instrument XM Series User Manual Page 49 CQUITEK Spectrum Analyzer Spectrum Analyzer alal gt Blaa 20 0 25 0 30 0 Frequency Khz CHI CH 2 All Channels range BET Ronge BEN 0 00 EN Mode BE
26. e A second effect of the zero order hold architecture of the D A is that within the desired signal range i e from O Hz up to Fs there is an amplitude rolloff proportional to sin f Fs f Fs This ratio is known as the sinc function and results from the rectangular stair step shape of the D A converter time domain output The sinc response causes the output of a D A converter to be attenuated by 3 9 dB at the Nyquist Frequency Fs 2 Some reconstruction filters will have sinc or sin x x compensation In this case the filter not only attenuates signals outside the 0 Fs 2 frequency band but also provides an inverse sinc amplitude response within the 0 Fs 2 band XM Series User Manual Page 80 CQUITEK Referenced Source A voltage source in which not only the difference in voltage between the positive and negative terminal is defined but also the difference between either terminal s voltage and a reference voltage such as ground Settling Time The time taken for a system to respond to a transient event such as a voltage step when switching from one input to the next in a multiplexed data acquisition system Settling time is typically measured in microseconds from the transient input event until the measurement output is within some small tolerance of the final output such as 0 1 0 01 or 1LSB Single Ended Input An input whose voltage is measured with respect to system ground SNR Signal to
27. e from causing trouble as well 100kOhm is a good starting point For faster sampling applications educe the value as low as possible given the differential source constraints For slower sampling values up to 10 MOhm will be sufficient to keep the common mode voltage within range and provide very little source loading rt Measured V L at A D Figure 3 8 Differential large common mode source Differential mode is the recommended input operating mode in nearly all cases Psuedo Differential While differential mode eliminates many of the problems associated with single ended input mode it does so at the cost reducing the number of available inputs by half Psuedo differential mode provides many of the same benefits of differential mode without reducing the number of available inputs In pseuedo differenetial mode inputs are referenced to the pseuedo differenetial reference input which is a high impedance input As can be seen from Figure 9 this mode can be effective in eliminating measurement errors due to ground potential differences in a similar manner to differential mode However there is a XM Series User Manual Page 17 A QUITEK single pseuedo differenetial reference input which is shared among all analog inputs from 0 15 On 32 input boards there is a second pseuedo differenetial reference input which is shared among analog inputs 16 31 Again referring to Figure 3 9 pseuedo differenetial mode will eliminate
28. e sample frequency Bessel filter A type of filter which has excellent time domain distortion properties i e pulse response with very little ringing but poor frequency domain cutoff properties This filter characteristic can be implemented in either the analog or digital domain Butterworth filter A type of filter which has a good compromise between frequency domain cutoff properties and time domain distortion such as ringing This filter characteristic can be implemented in either the analog or digital domain Charge Injection An undesirable property of a multiplexer in which a small amount of electrical charge is injected into the selected multiplexer input when the multiplexer switches A voltage error is introduced which is equal to the injected charge divided by the input capacitance The voltage error decays over time as a function of the source resistance Lower source resistance results in faster decay of the voltage error CMRR Common Mode Rejection Ratio See common mode range Common Mode Range With a differential voltage the relevant measurement is the difference in voltage between the two signals in the pair The absolute voltage between either signal and ground should not affect the differential measurement In practice voltages between the differential signals and ground can distort the differential measurement Common mode XM Series User Manual Page 77 C QUITEK rejection ratio CMRR is a measure of
29. elected in the System Tree XM Series User Manual Page 34 Acqurrex Info Tab Acquitek Control Center Ble Edt Yen Halp Local Syetem Info Contigure Test 7 Sens Number DR123456709 FABRA cqutes Devica Number 1 R PEI PM ER Syctem BPC PS RRC 480804 2 CPU to F GAME 44000 ZK PO to l Wan EBB PIKAE M 154 Bride BCCI AB EB MB PIS t Au EID ME EZITTAB EBAMB Pit Arti USE EIT MB Fisk Powar Manage MAC yaa 059281 Sour usi n PEI KEE 8 20 Fasl Elter for FOM Brecon 2109 Laptop Integrated Y SIR aga PA Motdty AGP 3 w Acquiek DAD Board Deno BE dtvsre EP Acquiek lacas Enumero Pl Acevtek Control Center ElAcadek Bench fe fed m Bl Windows NT 20004P GT panty The information displayed on the Info Tab varies according to the device or module selected in the System Tree Selected Acquitek hardware devices display their serial number and the configured device number Other hardware devices display PCI configuration data Software modules display version resource information if available along with file date and size XM Series User Manual Page 35 A QUITE K Configuration Tab X OPU te PO die MAGE mm EDGE MED PO ku AGP badge EBENA DAM MOL AM SA badge GREI VARER AE PE M LOE Connie ERLT ABE LA PDA USE Controller METT PAM Pam Management Corti ED CUT ET PO drar hac mer mm IC DA Faa fre ka PC Marge Wi WR EK Lt ving gel oden rand Oran Loe hem ladh Bn age Y A8 Matty AGP De e e e e WR Aen DAD Find Demo
30. eral tab Device Number Logical device number of the Acquitek hardware device that will be used for acquisition This number must be assigned in Acquitek Control Center Target Workbook The workbook to which data will be acquired You must provide the entire name including the xIs extension if one is present Target Worksheet The worksheet to which data will be acquired This sheet must already be present in the specified workbook Target Column Starting Column for data acquisition Data for a single channel will be captured to the specified column Data for multiple channels will be captured to consecutive columns Target Row Starting row for data acquisition Samples for each channel will be captured in consecutive rows starting with the specified row XM Series User Manual Page 63 CQUITEK Analog In Configuration ExacgXL Settings x General Analog In Polarity Bipolar ke Channel Count Sample Count 1 Coupling DC DE fo Sample Rate Hz 10000 Mode Pseudo Dif y Scan Rate Hz foo Trigger fs o Channel 0 5 Level 2 5 Type Falling DI Range Noise Reject Display the Analog In Configuration tab on the configuration dialog by clicking Configure on the Acquitek Data Acquisition toolbar then choosing the Analog In tab Channel Count The number of channels from which data will be acquired Sample Count The number of samples to acquire from each channel Note that
31. ermocouples are common floating sources Gibbs Phenomena Signals with sharp edges in their time domain response such as square waves require high frequency content in their frequency domain response to produce the rapid time domain changes If such a signal is passed through a low pass filter which removes the high frequency energy there may be substantial ringing at the time domain edges This is known as Gibbs Phenomena Careful design of the lowpass filter transition band can greatly reduce the amount of time domain ringing Harmonic distortion Typically expressed in dB this is the ratio of power at the fundamental signal frequency to the power at N times the fundamental frequency where N is an integer The largest distortion typically occurs at N equal two or three Non linearities in components through which a signal passes change the characteristics of the signal Typically these changes are best observed in the frequency domain through the use of tools such as the Fast Fourier Transform FFT Harmonic distortion results in energy in a signal being increased at integer multiples of the fundamental frequency of the input signal Instrumentation Amplifier A electrical circuit with two inputs and one output An ideal instrumentation amplifier presents no load to the two inputs and the output voltage with respect to ground is proportional to the difference between the two input voltages In practice an input bias current
32. figured in Acquitek Control Center You must assign a device number to the acquisition board before it can be used in Acquitek Bench or other application software XM Series User Manual Page 46 CQUITEK Oscilloscope Oscilloscope Of Jime Base SEC DIV Position Source cai ah Pre Capture Post Capture Auto Ei i N VoltszDIV MEA Position 0 0 BA Coupling DC ES Y Visible Ref Line CHI Mode PE 22 mode BE Channels Coupling IS Coupling DS Probe Probe le Tx C 10x 100x le 1x 10x C 100x Device Number i B Analog In Channel o B Dn Analog In Channel n E EN The Oscilloscope is used to provide a two dimensional visual display of an analog signal Most commonly it is used to show signal amplitude versus time displaying the waveform of the signal being monitored SEC DIV Specify the number of seconds per division on the Horizontal Axis Display Position Time Base Specify the vertical offset of the entire channel in percent of the Display XM Series User Manual Page 47 Ages Pre Capture Specify how much data to capture before the beginning of the display The value is specified in divisions of the horizontal axis Post Capture Specify how much data to capture after the end of the display The value is specified in divisions of the horizontal axis Level Specify the level where the trigger mechanism will trigger a new frame to be displayed Source Specify the channel index use
33. g sine square triangle DC and arbitrary Wave Type Selects sine square triangle DC or arbitrary File waveform Amplitude Sets the amplitude of the generated waveform Offset Sets a DC offset for the generated waveform XM Series User Manual Page 54 ASTEK WF File When File wavetype is chosen selects the file containing waveform data Each line of the file should contain a time offset value followed by a tab then the sample value and a carriage return Analog Out Channel Zero based analog output channel number Frequency Output cycles per second Waveform files are assumed to be 1024 points per cycle Range Waveform amplitude min and max values Device Number Data acquisition device number as configured in Acquitek Control Center You must assign a device number to the acquisition board before it can be used in Acquitek Bench or other application software XM Series User Manual Page 55 CQUITEK XM Series Third Party Drivers LabVIEW The Acquitek Data Acquisition LabVIEW VIs provide a LabVIEW interface for all calls available through the Acquitek Data Acquisition API The names and parameters are identical to those exported by XDADAQ DLL XM Series User Manual Page 56 AcQurtx inte ES ee Fe Fee f i Analog Digital Digital MB MB Read Read Out In Out Check Copy Raw Volts ie Set Set Buffer Clock PoP P Rate esi Start Stop KS 7 ya Analog In
34. h quality waveforms The onboard DSP deep onboard FIFO and PCI bus mastering ensure reliable output of waveforms or other sequences at the full sampk rate The outputs should not drive loads less than 2 KOhms Output accuracy may be degraded with a lower resistance load The ouputs are short circuit current limited but care should be taken to avoid long duration output shorts as the thermal strain may eventually damage the output driver Digital O Each XM Series board has several digital I O pins The number of digital I O s is equal to the number of analog inputs on the board The digital I O s are grouped into 8 bit ports Each port can be configured as an input or output port All 8 lines in each port are configured in the same direction Upon reset the port is configured as an input The digital I O architecture uses a 74ACT gate as the driver and receiver along with a 10 KOhm pull up resistor on each I O The 74ACT receiver has TTL compatible input logic thresholds and and the driver can source or sink 24 mA output current The digital I O s are capable of quasi static operation or clocked mode In clocked mode each digital I O is read on a clock which can be synchronous with the analog input clock Thus every digital I O can be read at the maximum XM Series User Manual Page 21 CQUITEK sample rate of the board Output is similar All digital I O s can be updated on a clock which can be synchronous with the analog outpu
35. how much the voltage between the differential pair and ground distorts the differential measurement The common mode range defines how large the voltage between either signal and ground can be before the differential inputs no longer function D A Digital to analog converter A component which produces an analog output signal which is proportional to a digital input value Typically a D A will hold the same analog output voltage for a period of time called the sample time and be updated periodically with digital input values at a rate called the sample frequency dB A decibel or dB is 10 logl0 power ratio between to signals Since power is proportional to voltage squared when dealing with voltages a dB is 20 log10 voltage ratio dBfs dB relative to a full scale A D or D A signal dB V dB relative to one Volt dBm dB relative to one milliWatt dBmV dB relative to one milliVolt Differential Input An input through which the difference of two signals at the positive and negative inputs is measured rather than the difference between a signal and system ground There is a limit to how far the two signals can be from the system ground before the input is no longer able to measure simply the difference between the two inputs but instead is distorted by the difference between the signals and ground This limit is called the common mode voltage range Elliptic Filter A type of filter which has excellent frequency domain cu
36. iment menu Select trigger options from the dialog box To set up digital trigger mode click the Set up digital trigger button and specify a port mode and which lines to enable If you select Edge trigger the bottom row of checkboxes allows you to specify which ports require a rising edge and which ports require a falling edge If you select Pattern trigger you can specify which ports will be logic high in the pattern and which ports will be logic low XM Series User Manual Page 69 Anas Setting Input Channel Options E DASYLab7 Net ain dsb Worksheet File Edit Modules NI DAQ Experiment View Options Window Help gt 0 2 pejal Sess ella Heel zl sl L Jalt Size Analog Input Mode Name Exacq CH Al Description DCE EEEEEEE EERE Channel Name JExacq CH Al 0 Unit Input Range Channel Setup z 10 00 m Couping Channel Scaing AC Dc __ Channel Setup C DE Terminated r Input Mode e Differential Single Ended Pseudo Differential To set coupling or input mode double click on an analog input module In the dialog box that opens select the channel you wish to set up and click Channel Setup Specify options for each of these and click OK For More Information For more information please consult the DASYLab User Guide XM Series User Manual Page 70 Agne XM Series Technical Specifications Analog I
37. ions The outputs are waveform quality with both waveform playback capability and function generation or they can be slaved to the input channel sequence The board is PCI Plug and Play and autocalibrating so there are no jumpers or potentiometers to manually adjust The XM architecture is shown below in figure 3 1 XM Series User Manual Page 10 CQUITEK Aux I O Header Local Control Bus 1o 18 32 Digital 1 0 Drvr Cosi Revr Analog In Gain amp A Offset Trim 16 Bit 1 MHz A D gt Converter Control Timing and Data Management FPGA SCSI 68 Connector Sync Int Cik Leq induj Output Data Calibration EEPROM Analog Out 0 Local Control Bus VLIW Processor 8 16 MBytes 133 MHz SDRAM Offset Trim 16 Bit 1 MHz D A Converter Addr Data 32 Bit 33 MHz PCI Bus Figure 3 1 XM Board Block Diagram The mechanical layout of the XM Series board is depicted in Figure 3 2 below All members of the XM family share the same board footprint Family members without analog outputs will have unpopulated components in the analog output section XM Series User Manual Page 11 Ae QUITEK Secondary UO 68 Pin VHDCI Female Primary I O 68 Pin VHDCI Female Pin 1 Figure 3 2 XM Board Layout Connectors The XM board has one 68 pin female VHDCI connector on which 16 analog inputs 16 digital I O s two analog outp
38. m Graphi Rate Hz V r delta t Ese A D board modes 3 Modes XM Series User Manual Page 60 AcQurtx Installation e Copy the file TPAcquitek dll from AcquitekInstallDirectory NThirdParty VTestPoint to the directory where TestPoint is installed e Edit the TestPoint ini file found in the TestPoint directory Replace the entire ADO section with this text ADO manufacturer AUTO MODE Bipolar TYP E Pseudo COUPLING DC DACOUPLING DC e Edit the TPAD ini file found in the TestPoint directory Find the ADDRIVERS32 section and add this line ACQUITEK WDM TPACQUITEK DLL The Acquitek data acquisition board assigned logical device number one using Acquitek Control Center can now be accessed in TestPoint as AD device zero To use multiple boards or change the logical device that will be used copy the board configuration information added for ADO into another section ADn The Acquitek device number will always be one greater than the TestPoint AD number Notes You must run Acquitek Control Center to assign logical device numbers to all Acquitek devices and verify basic functionality before using the devices with TestPoint The TestPoint driver will be copied to the AcquitekInstallDirectory ThirdParty TestPoint directory by Acquitek Setup You must complete the installation as documented above A sample TestPoint application called AD_DA tst is copied to AcquitekInstallDirectory ThirdParty TestPoint samples by
39. m Also note that the V after XDADaqLV is needed so that LabVIEW will search the subdirectories under XDADaqLV XM Series User Manual Page 57 CQUITEK MATLAB ziaz Fie Edt View Web Window Help D ih av 2 Current Directory gt Prog am Fier xacalTrwdParty WATLABNEX angles k erer Director ajx D Program Files Exacq ThirdParty MATLA zj o a IcttmegeRespeno m M file D Ces eeh M file 24 Jun 2003 05 52 PE Ca Using Toolbox Path Cache Type help toolbox path cache for mores To get started select MATLAB Help from the Help menu gt gt Ciloisebemo Initislized Execq Techmologies Board Pwasing for commection to external instrument Press key to go on Figure No 1 Fie Edt View Insert Tools Window Help IpDen kA Ae PAD TN ET DI AA H H ET HN TEE AA CHWs sebeno Rolative Power Spectrum dB 5 8 A start j Paused Press any key Acquitek currently provides access to its data acquisition API in MATLAB via MEX files These functions are contained in dll files in the Acquitek ThirdParAMATLABMEX directory Their help text documentation is contained in m files with filenames that correspond to the dll files To see this documentation type help XXX at the MATLAB prompt where XXX is the part of the filename before the dll extension such as XDA Ain Volts The functions can be called just as any M function is called For e
40. me as above but without enclosure Rackmount kit front panel and 2 empty hole covers use with B 115x VHD68 Ext 1m For XM boards Connects from VHD 68 connector on XM boards to B 115x 68 pin breakout unit VHD68 Ext 2m For XM boards Connects from VHD 68 connector on XM boards to B 115x 68 pin breakout unit Glossary Aliasing The term used to describe the observed effect of sampling an analog signal at a sampling frequency less than two times the highest frequency content of the signal Signal processing theory specifically Nyquist s Theorem states that an analog signal can be exactly reconstructed from a periodic sampling of that signal if the sampling rate is greater than twice the highest frequency contained in the analog signal With the exception of some specialized undersampling applications it is important to prevent aliasing before it happens through the use of high sampling rates and or anti aliasing filters Once a signal has been corrupted by aliasing it can no longer be exactly reconstructed from its samples Anti Aliasing filter A filter with a frequency cutoff below one half the sampling rate It is used to prevent aliasing during the sampling of an analog signal A D Analog to digital converter A component which produces a digital representation of the voltage of an input analog signal at an instant in time called the sample time Typically an A D will sample an input signal periodically at a rate called th
41. measurement errors due to ground potential difference only if all pseuedo differenetial inputs sharing a common pseuedo differenetial reference input also share the same voltage reference which need not be the same as the measurement computer ground reference E Measured V L at A D Figure 3 9 Pseudo Differential inputs Common Mode Range As shown in Figure 3 9 above the instrumentation amplifier will not measure any signal between its inputs and ground and only measure the difference between the voltages at its inputs Both input signals must be in the range AinGnd 10V to AinGnd 10V in order for the instrumentation amplifier to function correctly Input Protection As shown in the XM block diagram Fig 3 1 the input multiplexer is the first component through which the analog inputs pass following the connector The input multiplexer is fault protected to protect it and the downstream components from damage if the input is inadvertently connected to a source XM Series User Manual Page 18 A QUITEK voltage outside the analog input range The overvoltage protection range is listed in the board specifications section When the overvoltage protection is operating the mux goes into a high impedance state and negligible current will flow into or from the board It is possible that a floating source will have enough static charge that its common mode voltage is in the range where the overvoltage protection is operable In
42. n Percent of the Display Coupling Specify the signal coupling of this channel Visible Specify whether the channel trace line is visible Digital In Lines Digital inputs which will be sampled and displayed Only the first 8 DIOs can currently be used Samples Second Input sampling rate XM Series User Manual Page 43 CQUITEK Device Number Data acquisition device number as configured in Acquitek Control Center You must assign a device number to the acquisition board before it can be used in Acquitek Bench or other application software Note Additional configuration options can be accessed by right clicking on the instrument XM Series User Manual Page 44 CQUITEK Volt Meter Volt Meter AC Hane Auto F 0 00 to 10 00 Mode MEE Analog In Channel o E Device Number nm Y on The Volt Meter is used to measure voltages on analog input channels AC Enable RMS AC signal measurement Range Voltage range of signal under test Selecting Auto will cause the volt meter to automatically determine the smallest range which encompasses the measured voltage thereby yielding the highest precision Mode Analog input type differential 2 wire single ended 1 wire or nonreferenced single ended 1 wire Coupling Analog input coupling and impedance Analog In Channel Zero based analog input channel number XM Series User Manual Page 45 Ae QUITEK Device Number Data acquisition device number as con
43. nder test Mode Analog input type differential 2 wire single ended 1 wire or nor referenced single ended 1 wire Coupling Analog input coupling and impedance XM Series User Manual Page 52 Aces Probe Specifies a 1x 10x or 100x probe for scaling of display values Record Activate logging of data to disk File Name of data log text file Each line of the file contains a time offset value followed by a tab then the sample value and a carriage return Analog In Channel Zero based analog input channel number Samples Second Input sampling rate Device Number Data acquisition device number as configured in Acquitek Control Center You must assign a device number to the acquisition board before it can be used in Acquitek Bench or other application software Note Additional configuration options can be accessed by right clicking on the instrument XM Series User Manual Page 53 CQUITEK Wave Form Generator Strip Chart ajaj elle Channel 1 Channel 2 CHI Range EOUN 2 Range BEE av channels Mode BEE gt Mode DECI Disable strip plot scrolling Coupling EI Coupling EI gt ignore buffer overwrite errors Probe Probe le 1x 10x 100x gt 1x C 10x 100x Samples Second mm sn rio gt lt rio La File D File Device Number hn E Analog In Channel lo E Analog In Channel i on The Waveform Generator is used to output analog waveforms includin
44. nen ml IC 305C TX Fast Elheknk for POR Mira 2100 L tep Integrated WIR st PA Mobily AGP 2 Analog Output BS Acquiek DAD Board Deno ES SS Ge EB Sette Channel 2 Polarity Bipola DC Volts 0 0000 D I gek FA cad Enumero Aceves Control Corte Digital 10 lacada Banct CTS om Slinde NT 20000P Thir party VI o E The Test Tab is only available when an Acquitek hardware device is selected in the System Tree Pane This page is used to test functionality of the selected device Select a device channel for analog IO or configure direction for digital IO then activate the panel by clicking its On button Correct installation and operation can be verified for all analog and digital channels XM Series User Manual Page 37 Ae QUITEK Acquitek Bench Be Edt retrument Window Heb About Acquitek Bench CQUITEK Acauitek Bench Yerin 1 4 3 0 Copyagt lc Exacg Techndoges Ire 2003 2004 Acquitek Bench is a collection of tools that enables a PC equipped with an Acquitek data acquisition device to function as a DC voltage source a logic analyzer a digital multimeter an oscilloscope a spectrum analyzer a strip chart recorder and an arbitrary wave form generator XM Series User Manual Page 38 CQUITEK Menu and Toolbar Acquitek Bench File Edit Instrument Window Help The menu and toolbar are used to open and close the various instruments windows and arrange the display of those windows File E
45. noise ratio Typically expressed in dB this is the ratio of the desired signal power to the undesired noise power SFDR Spur free dynamic range Typically expressed in dB this is the ratio between the power in an input signal and the largest spurious signal either harmonically related to the input signal or not Successive Approximation An analog to digital converter architecture capable of high resolution conversion at moderate speed Unlike pipelined converters and sigma delta converters the input sampling rate does not need to be periodic and the start and end of a conversion are well defined making it the most suitable architecture for multiplexing inputs XM Series User Manual Page 81 C QUITEK Technical Support Acquitek is committed to providing exceptional technical and engineering support When you need help with your Acquitek XM Series product please have the following information available e A complete description of the problem including any error messages or instructions on re creating the error e Your computer configuration including brand processor speed memory and other hardware installed e Description of what is connected to the XM Series boards e Operating System Environment Windows Linux etc e Information on the compiler you are using if applicable e Sample code if applicable Technical support can be contacted as follows Acquitek SAS 12 avenue des pr s Montigny le Bret
46. not cause the PGIA to become saturated For the same reason it is also suggested that unused inputs be grounded in single ended mode or tied to the reference signal differential mode to prevent noise pickup from saturating the PGIA if an unused input is inadvertently selected in the multichannel scan As discussed above there are several potential pitfalls with multi channel scanning The user should consider alternatives to simple multi channel scanning if in doubt about any of the above settling time limitations to avoid any channel to channel dependencies One such alternative is to acquire multiple points consecutively from each channel before switching to the next channel These points can be averaged to reduce the effects of system noise or noise pickup on cables If multechannels scanning is used always use low impedance input sources XM Series User Manual Page 20 CQUITEK Analog Outputs Only applicable to boards equipped with analog outputs XM 2320 2321 XM 2350 2351 XM 2420 2421 XM 2450 2451 Many members of the XM Series are equipped with two analog outputs These outputs have software selectable output ranges of 0 to 10V and 10 to 10V In the unipolar mode the data format is straight binary In bipolar mode the data format is two s complement The analog outputs can operate in quaststatic or clocked mode The atput circuitry has been designed with both high accuracy and fast settling time to permit output of hig
47. nputs Number of Channels Resolution Max Sample Rate Ranges Input Coupling Input Impedance Input Bias Current Input Protection Input Operating Voltage Charge Injection Settling Time Analog Bandwidth 3dB DNL INL System Noise typical XM Series User Manual 16 input XM boards 32 input XM boards range 0 polarity 0 range 1 polarity 0 range 2 polarity 0 range 3 polarity 0 range 0 polarity 1 range 1 polarity 1 range 2 polarity 1 range 3 polarity 1 at 25C potential diff from sys ground range 0 range 1 range 2 range 3 max range 0 range 1 range 2 range 3 XM 23x0 16SE 8D 32SE 16D 16 bits 250 kHz 10V 5 V 2 5 V 1 25 V 0 10 V 0 5 V 0 2 5 V 01 25 V DC 10M Ohms 2 pA 40 55V 10 V 4 pC 3 5 uS 600 kHz 800 kHz 800 kHz 800 kHz 3 LSB 0 9 LSB 0 9 LSB 1 1 LSB 1 2 LSB Page 71 XM 24x0 XM 23x1 16SE 8D 16SE 8D 32SE 16D 32SE 16D 16 bits 16 bits 1000 kHz 250 kHz 10 V 10 V 5V 1V 25 V 0 1V 1 25 V 0 01 V 0 10 V 0 10 V 0 5 V 0 1 V 0 25 V 0 0 1 V 0 1 25 V 0 0 01 V DC DC 10M Ohms 10M Ohms 2 pA 10 pA 40 55V 40 455V 10V 10 V An Ant 3 5 US De 600 kHz 800 kHz 1300 kHz 800 kHz 4000 kHz 800 kHz 5000 kHz 250 kHz lt 1 LSB no missing codes 2 5 LSB 3 LSB 1 5 LSB 2 LSB 1 5 LSB 2LSB 1 8 LSB 6 LSB 1 9 LSB 22 LSB XM 24x1 16SE 8D 32SE 16D 16 bis 1000 kHz 10V 1V 0 1V 0 01 V 0 10 V 0 1V 0 0 1 V 00 01 V DC 10M Ohms 10
48. nstructions to install the application and driver software It is recommended that you leave installation options unchanged to perform a full installation of all software components e After the installation completes remove the CD and reboot your computer Configure the Data Acquisition Hardware e Run Acquitek Control Center from the Acquitek program group on the Windows Start menu e The new data acquisition device should appear as a node in the Local System Hardware Acquitek PCI PXI branch of the System tree Click on the node e The serial number and logical device number will display in the Configuration pane The logical device number is the tag that all application software uses to specify which hardware device will be used e To change the assigned device number click on the configuration tab and select a new number using the device number edit control Click the save button to make the change permanent Test the Data Acquisition Hardware e If Acquitek Control Center is not still running re run the application from the Acquitek program group on the Windows Start menu and select the System tree node for the data acquisition device e Select the Test tab in the Configuration pane e The displayed test panels can be used to test all analog input channels and analog output channels as well as the digital IO lines Connecting an analog output to an analog input then turning on both panels can be used as a quick check to verify ba
49. on between analog and digital signal In general it is good for the noise to be small Since noise is generally a random process it is best measured in terms of an RMS voltage Statistically the peak value of random noise is XM Series User Manual Page 79 CQUITEK unlimited but the likelihood of such peaks is infinitesimally small The likelihood of a noise magnitude exceeding two times the RMS value is less than 5 Nyquist Frequency Nyquist s Sampling Theorem states that an analog signal can be exactly reconstructed from a periodic sampling of that signal if the sampling rate is greater than twice the highest frequency contained in the analog signal Therefore the Nyquist Frequency is the sampling rate Fs 2 Any frequencies contained in the analog signal above the Nyquist Frequency will be aliased into the band 0 Fs 2 by the sampling process PGIA Programmable Gain instrumentation Amplifier Programmable Gain Instrumentation Amplifier An instrumentation amplifier in which the scaling coefficient which multiplies the difference between the input voltages to produce the output voltage can be changed via control signals In an instrumentation amplifier which is not programmable the scaling coefficient is typically set by a resistor Pseudodifferential Input A differential input in which the negative input is intended as a voltage reference only not to carry signal information The negative input is isolated from the
50. onneux 78059 St Quentin en Yvelines France Phone 33 1 61 37 32 11 Fax 33 161 3732 13 e mail support Q acquitek com Web http www acquitek com Technical Support Hours Monday Friday 9 00 am 6 00 pm GMT 1 Saturday Sunday amp Holidays Closed XM Series User Manual Page 82 C QUITEK
51. or Acquitek Control Center XM Series User Manual Page 32 Ae QUITEK System Tree Pane EE Hardware EEAcquitek OPCI FXI SS Acquitek DAQ Board Demo ae System lg A4 E 32443BX 2 lt 440BX ZX CPU to F E 82443BX ZX 440BX ZX PCI to Al 23 32371EB MB PIIX4E M ISA Bride 9237148 EB MB PIIX4 E M EID 9237148 EB MB PIIX4 E M USE ma 92371MB Pllx4M Power Manager E Crystal 054281 SoundFusion PCI SEA Unknown 5 3C905C TX Fast Etherlink for PC b Sal Inspiron 2100 Laptop Integrated W MAR age P M Mobility AGP 2x Si Acquitek DAG Board Demo OTE Software OE Acquitek FS Acquitek Enumerator FS Acquitek Control Center FS Acquitek Bench ow System TS windows NT 2000 P E Third party ly gt Ready The System Tree Pane displays a graphical representation of the hardware and software discovered during the last system scan This information can be updated by selecting View Refresh from the main menu There are separate branches on the tree representing Acquitek hardware devices system and third party hardware devices Acquitek software components OS software components and third party software components The leaves on the branches can be selected to display additional information in the Configuration Pane XM Series User Manual Page 33 CQUITEK Configuration Pane The Configuration Pane displays one or more tabbed pages with additional information about the hardware device or software module currently s
52. rator this allows precise control and synchronization of all sampling clocks in the system System Management As noted in the PXI Extensions section there is no specified driver on any of the Star Triggers Bussed Triggers or Local Bussed signals As such many peripherals may be capable of driving the same line simultaneously To prevent this potentially hazardous conflict the PXI specification generally states that all drivers should be disabled upon power up and only enabled by a higher level PXI resource manager For Acquitek boards the high level system configuration management is performed by Acquitek Control Center ECC ECC is able to determine the slot location of all Acquitek boards and thereby provide some intelligence to prevent configuration conflicts however caution is required since ECC does not know the capabilities or configuration of boards from other manufacturers In ECC the system designer can enable the Star Trigger functions and direction enable the use of PXI bussed trigger line 7 and enable the driving or receiving of the PXI synchronizing clock From the AcquitekDA SDK the state of these lines may be set or read but errors will be returned from the SDK if the feature has not been enabled in ECC See Section 4 of this manual XH Series Software Acquitek Control Center as well as the ECC help file and SDK documentation for details XM Series User Manual Page 30 CQUITEK Acquitek Control Center
53. ronmental Dimensions 4 HP single slot 3U PXI 160 x 100 mm Power Consumption 50 mA 5 V 30 mA 12 V 610 mW Operating Temperature 0 C to 55 C Storage Temperature 20 C to 70 C Connectors 68 Pin VHDCI female analog and digital 1 0 0 15 68 Pin VHDCI female analog and digital I O 16 31 if applicable XM Series User Manual Page 74 CQU ITEK XM Series Cables amp Connectors Optional Acquitek offer a wide array of breakout boxes connector panels cables and cable assemblies to assist in making analog and digital I O connections to the CH Series boards Available connectivity options include B 1150 Breaks out analog and digital I Os 0 15 or analog and digital I Os 16 31 on XM boards Connects to board via 68 pin VHD connector Requires L 4851 or L 4852 cable to connect B 1155 Same as above but without enclosure B 1410 Rackmount kit for XM Series L 4851 L 4852 Use with all XM Series boards Connects from 68 pin VHD connector on XM board to B 1150 1155 Available in 1M L 4851 and 2M L 4852 lengths XM Series User Manual Page 75 CQUITEK The complete line of breakout boxes and cables is as follows Breakout Boxes amp Connector Boards B 1150 B 1155 B 1410 Cables L 4851 L 4852 XM Series User Manual Breaks out analog and digital I Os 0 15 or analog and digital I Os 16 31 on XM boards Connects to board via 68 pin VHD connector Requires L 4851 or L 4852 cable to connect Sa
54. s DNL lt 1 bits lt 1 bits Montonocity 16 bits 16 bits Voltage Output Ranges Unipolar 0 10V 0 10V Bipolar 10 10V 10 10V Output Coupling DC DC Output Impedance DC lt 0 1 Ohms lt 0 1 Ohms 10 KHz 0 3 Ohms 0 3 Ohms XM Series User Manual Page 72 CQU ITEK Analog Outputs cont d Output Current Max Protection Short to Gnd Power On State Settling Time for Full Scale Step Slew Rate Noise Accuracy 1 year Gain stability typical Digital UO Number of I O Input High Input Low Logic family compatibility Output High Output Low Power Up State Pull up resistor Counter Timers Num of counter timers Bits per counter Clock speed Clock Source Gate source Supported modes XM Series User Manual XM 23xx XM 24xx 15 mA 15mA Yes Yes lt 0 100 abs V lt 0 100 abs V to 0 1 1 0 us 1 0 us to 0 01 13 us 1 3 us to 1 LSB 17 us 1 7 us 27 VIs 27 V S DC 1 MHz 200 uV rms 200 uV rms Unipolar 2 02 mV 2 02 mV Bipolar 2 13 mV 2 13 mV ae 2 ppm C 2 ppm C Up to 32 four 8 Bit ports Each port selectable as input or output 2 0 V 5 V max 0 8 V 0 V min TTL 2 4 V min amp 24 mA 0 4 V max 24 mA Input High Impedance 10 K Ohm XM 23xx XM 24xx 3 3 24 24 20 MHz max 40 MHz max internal clock or external pin software control or external pin 82C54 Mode 1 Triggered pulse 82C54 Mode 2 Rate Generator 82C54 Mode 3 Square Wave 82C54 Mode 5 Triggered Strobe Physical Envi
55. sic operation Run Application Software e Installation and configuration of the Acquitek data acquisition hardware and software is now complete e You can run the included Acquitek Bench application software to use the device in a wide range of test and measurement tasks e Remember that all application software will refer to the data acquisition hardware using the logical number assigned by Acquitek Control Center XM Series User Manual Page 9 A QUITEK Hardware Overview Hardware Overview The Acquitek XM Series of multifunction analog I O boards was designed to provide high speed and 16 bit precision at a low price to meet challenging PC based instrumentation applications All XM Series boards utilize an onboard processor large local memory buffers and PCI bus mastering to provide glitch free capture and output of analog waveforms with nearly unlimited lengths This performance is provided even under non realtime PC operating systems when running complex user applications which are supported by a comprehensive Software Development Kit and sample code With up to 32 inputs sampled at up to I MHz and flexible triggering the XM Series is ideal for highspeed automation and control applications The onboard DSP coprocessor can offload critical real time tasks such as event driven channel sequence changes or sensor input linearization through look up tables or computation to free the host program for higher level algorithms and applicat
56. stem must be accounted for in order to achieve accurate measurement results Settling time is the amount of time required for a system to respond to a transient input event such as an input switch in a multiplexed data system If all of the inputs to be sampled are of similar magnitude and on the same input range settling time may not be a factor However if different gains are used between input channels it will be very important to consider how settling time may affect measurement accuracy Settling times for the XM input and outputs are provided in the specifications section XM Series User Manual Page 19 CQUITEK Settling time during multtchannel scanning is also adversely affected by a multiplexer property called charge injection The analog input multiplexer injects a small amount of charge given in the specifications section into the selected input upon switching This introduces a voltage error on the input equal to the charge injected divided by the input capacitance The voltage error will decay according to the RC time constant of the input resistance and capacitance High impedance inputs will cause the voltage error to take longer to decay and thus the settling time could increase Note that if an input signal saturates the PGIA there is a significantly longer overload recovery time than the normal PGIA settling time when switching inputs in a non saturated case Therefore it is strongly advised to select input ranges which will
57. t clock In clocked mode the digital I O s share FIFO space with the analog inputs and outputs but this has no detrimental effect on the analog signals since the FIFOs on the XM Series of boards are so large Counter Timers The XM series of boards are equipped with two or three identical counter timer circuits Each counter timer circuit is fully available to the user they are not used to provide timing clocks to either the analog inputs or analog outputs The counter timers emulate 82C54 operating modes as described below Mode I Retriggerable One Shot Out is high Rising edge on gate triggers out to go low and down counting to start Out stays low until count expires at which point out goes high Mode 2 Rate Generator Out is high Gate high enables down counting When count expires out goes low for one clock cycle then high again Count is reloaded and down counting continues This results in a sequence of negative pulses of width 1 clockFreq and period countReg clockFreq being generated while gate is active Mode 3 Square Wave Generator Out is high Gate high enables down counting When count reaches count 2 out goes low When count expires out goes high Count is reloaded and down counting continues This results in a square wave of approximately 50 duty cycle and period countReg clockFreq being generated while gate is active Mode 5 Retriggerable Strobe Out is high Rising edge on gate triggers down counting to s
58. tart Out stays high until count expires at which point out goes low for one clock then high again Note the countReg on the XM Series timers is 24 bits as compared to the 16 bit count registers on the 82C54 This provides for more versatility at high clock rates The clock source is software selectable from either the on board sample clock or the external clock input pin The gate source is also software selectable between software controlled gating or gating from an external pin The counter timer XM Series User Manual Page 22 CQUITEK output is available on a pin and can also trigger an interrupt in the onboard DSP There is a separate external clock gate and output pin for each counter The Acquitek Data Acquisition SDK has documentation on the functions used for programming the counter timers Triggers The XM Series have many triggering options Digital trigger inputs and outputs are available on the main connector to signal the start of a conversion the start of an input sequence the start of an output sequence or an output update Analog triggering is typically implemented in the board hardware by comparing the past and present A D converter output values with register values corresponding to the trigger voltage and slope Additionally an analog trigger is available It lies between the PGIA and the A D converter as shown in Figure 3 10 and thus operates on a scaled multiplexed input signal The analog comparator triggering c
59. tek B 1150 1155 is a breakout board for this connector and is connected to the XM board with L 485x cables The layout of the B 1150 1155 is shown in Figure 3 12 below The B 1150 1155 is available in either a stand alone board format B 1155 or in a rackmountable box format B 1150 In the standalone board format connectors J9 J10 and J11 will not be populated In the rackmountable box format connectors J2 J3 J5 J6 and J8 will not be populated since they are duplicated by J9 J10 and J11 J4 and J7 will be populated since there is not enough space to bring the signals on these connectors out to the box edge With a 32 input XM Series board the analog inputs 16 31 and digital I O Ports C and D are brought out to a second VHDCI 68 female connector on the XM board An additional B 1150 1155 breakout board and an additional L 485x cable are required for this connector XM Series User Manual Page 26 CQUITEK 5V 0 75A AOut0 AOut1 AOutGnd DGnd J5 AD Trig AD SeqSt D A Trig D A SeqSt JB DGnd CntO Cik Cnt0 Gate Cnt0 Out Cnt1 Cik Cnt1 Gate Figure 3 12 B 1150 1155 Layout XM Series User Manual Page 27 ITEK PXI Implementation Details As the name PCI Extensions for Instrumentation or PXI implies PXI boards are built on PCI technology The PXI extensions are described briefly below For more information please see the PXI specifications which are available at the PXI System Alliance web site www pxisa org
60. this event since the mux is high impedance no current will flow from the floating source to dissipate its common mode potential It is therefore advisable to connect a high value resistor to reference a floating source to the XM board ground 10 MOhm is sufficient to drain static charge but 10 kOhm may be preferable in a fast switching application Input Bias Current The PGIA on the XM Series boards like all instrumentation amplifiers requires a return path for the bias currents at its inputs In the case of the XM Series the bias currents are extremely small typically less than 10 pA On the XM Series boards there are onboard bias resistors of 10 MOhm on both the positive and negative PGIA inputs These provide a path for the PGIA input bias current and introduce less than 100uV of measurement error On a typical low impedance referenced source most of the bias current will flow through the source resistance and the measurement error will be much smaller Having the bias resistors on board simplifies connection to a floating source subject to the limitations discussed above in the Input Protection section Without these onboard resistors one or both terminals of a floating source would always require a resistive connection to ground to provide input bias current Multi Channel Scanning The XM series of multifunction boards can scan multiple inputs at the maximum sampling rate of the board However settling times of the analog input sy
61. tifunction analog I O boards was designed to provide high speed and 16 Bit precision at a low price to meet challenging PC based instrumentation applications All XM Series boards utilize an onboard processor large local memory buffers and PCI bus mastering to provide glitch free capture and output of analog waveforms with nearly unlimited lengths This performance is provided even under norrealtime PC operating systems when running complex user applications which are supported by a comprehensive Software Development Kit and sample code With up to 32 inputs sampled at up to 1 MHz and flexible triggering the XM Series is ideal for high speed automation and control applications The onboard DSP coprocessor can offload critical real time tasks such as event driven channel sequence changes or sensor input linearization through look up tables or computation to free the host program for higher level algorithms and applications The outputs are waveform quality with both waveform playback capability and function generation or they can be slaved to the input channel sequence The board is PCI Plug and Play and autocalibrating so there are no jumpers or potentiometers to manually adjust XM Series User Manual Page 5 C QUITEK Features XM Series User Manual 16 32 Single Ended Inputs 8 16 in Differential Mode Up to I MS s Maximum Sampling Rate 16 Bit A D Resolution Up to 16 MB 8 MSample Local Acquisition Memory 64K Channel Gain List
62. toff properties but poor time domain distortion properties i e pulse response with excessive ringing This filter characteristic can be implemented in either the analog or digital domain FFT Fast Fourier Transform A mathematical tool for analyzing the frequency content of a signal FIFO First In First Out A temporary storage memory with no addressing in which data is stored and retrieved in first in first out order On a data acquisition board a FIFO is used to free the host processor from servicing the data acquisition hardware on a periodic interval Typically the hardware accesses one side of the FIFO at the periodic sample rate or a multiple of it The host accesses the other side of the FIFO to either fill it with data for output or read the input data The host can do so in burst mode which is much more efficient For example a burst transfer across the host PCI bus can reach nearly 132 Mbytes sec whereas non burst transfers are a small fraction of that rate With a non ealtime operating system such as Windows it is important for the FIFO to hold enough data to sustain periodic data acquisition during intervals when the processor is not available to service the data acquisition hardware XM Series User Manual Page 78 CQUITEK Floating Source A voltage source in which the voltage at the positive or negative terminal is referenced only to the other terminal not to an absolute reference or ground Batteries and th
63. utGnd 54 20 Reserved AOutGnd 54 20 Reserved DGnd 53 19 PortA4 DGnd 53 19 PortA4 PortA0 52 18 DGnd PortCO 52 18 DGnd PortA5 51 17 PortA1 PortC5 51 17 PortC1 DGnd 50 16 PortA6 DGnd 50 16 PortC6 PortA2 49 15 DGnd PortC2 49 15 DGnd PortA7 48 14 5V Fused PortC7 48 14 5V Fused PortA3 47 13 PortBO PortC3 47 13 PortDO PortB1 46 12 PortB2 PortD1 46 12 PortD2 PortB3 45 11 PortB4 PortD3 45 11 PortD4 PortB5 44 10 PortB6 PortD5 44 10 PortD6 A D Trig I O 43 9 DGnd Reserved 43 9 DGnd Cntr1 Clk 42 8 5V Fused Reserved 42 8 5V Fused Cntr1 Gate 41 7 DGnd Reserved 41 7 DGnd Cntr1 Out 40 6 D A Trig VO Reserved 40 6 Reserved DGnd 39 5 D A SegSt I O DGnd 39 5 Reserved A D SegStl O 38 4 DGnd Reserved 38 4 DGnd CntrO Clk 37 3 CntrO Gate Cntr2 Clk 37 3 Cntr2 Gate DGnd 36 2 CntrO Out DGnd 36 2 Cntr2 Out DGnd 35 1 PortB7 DGnd 35 1 PortD7 VHDCI 68 VHDCI 68 Figure 3 3a XM VHDCI 68 Pinout Figure 3 3b XM Secondary VHDCI Pinout Analog Inputs The Acquitek XM board has up to 32 analog inputs which are multiplexed into a programable gain instrumentation amplifier and then converted into digital data by a 16 bit successive approximation A D The analog inputs are high impedance to prevent undesired loading of the system to be measured High impedance inputs are prone to noise pickup While crosstalk between channels of the XM board is sm
64. uts if applicable and a variety of timing and reference signals are brought out The pinout of this connector is shown in Figure 3 3a below An Acquitek B 1150 1155 with an L 485x connecting cable is recommended for use with this connector In addition on an Acquitek 32 input XM board i e XM 2450 analog inputs 16 31 and digital I O 16 31 are brought out on a second 68 pin female VHDCI connector The pinout of this connector which is very similar to the main connector is shown in Figure 3 3b below An additional Acquitek B 1150 1155 and L 485x cable is recommended for use with this connector The B 1150 1155 and the L 485x cables are described below in the Accessories section XM Series User Manual Page 12 A QUITEK Aln0 0 68 34 Aln8 0 Aln16 8 68 34 Aln24 8 AlnGnd 67 33 Ain1 1 AlnGnd 67 33 Ain17 9 Aln9 1 66 32 AlnGnd Aln25 9 66 32 AlnGnd Aln2 2 65 31 Aln10 2 Aln18 10 65 31 Aln26 10 AlnGnd 64 30 Aln3 3 AlnGnd 64 30 Aln19 11 Aln11 3 63 29 AlnGnd Aln27 11 63 29 AlnGnd AlnGndSense0 15 62 28 Aln4 4 AlnGndSense16 31 62 28 Aln20 12 Aln12 4 61 27 AlnGnd Aln28 12 61 27 AlnGnd Aln5 5 60 26 Aln13 5 Aln21 13 60 26 Aln29 13 AlnGnd 59 25 Aln6 6 AlnGnd 59 25 Aln22 14 Aln14 6 58 24 AlnGnd Aln30 14 58 24 AlnGnd Aln7 7 57 23 Aln15 7 Aln23 15 57 23 Aln31 15 AlnGnd 56 22 AOutO AlnGnd 56 22 AOutO AOutGnd 55 21 AOut1 AOutGnd 55 21 AOut1 AO
65. xample to read a sequence of 5000 input voltages between 5V and 5V from analog input channels 0 and 1 of device 1 at 10000 Hz type the following at the MATLAB prompt ch0 ch1 XDA_Ain_Volts 1 0 1 5 0 5 0 10000 5000 XM Series User Manual Page 58 ASQ TEK The Acquitek ThirdPar MATLABMEX directory currently contains MEX files for analog input and output digital input and output and counter timer functions The analog input functions can be found in the following files XDA_Ain_Coupling dll XDA_Ain_Raw dll XDA_Ain_Volts dll Analog output functions can be found in the following files XDA_Aout_Func dll XDA_Aout_Raw dll XDA_Aout_Volts dll Digital input and output functions can be found in the following files XDA_Din_Read dll XDA_Dout_Write dll Counter timer functions can be found in the following files XDA_CT_Config dll XDA_CT_Gate dll XDA_CT_Read dll Example M functions that use these MEX files can be found in the Acquitek ThirdPar MATLABMEX Samples directory XM Series User Manual Page 59 CQUITEK TestPoint Capital Equipment Corporation s TestPoint is software for designing test measurement and data acquisition applications The Acquitek TestPoint driver enables the use of all Acquitek hardware with TestPoint to simplify data acquisition EA File Edit View Utilities Mode Run Debug Window Help Interactive A D testing App 1 AD_DA TST RER S Interactive A D testing Ss This progra
66. xit Close Acquitek Bench Edit Preferences Set application specific preferences View DC DC Source Open or close the DC Source window Logic Analyzer Open or close the Logic Analyzer window Meter Open or close the Meter window SS Oscilloscope Open or close the Oscilloscope window Im Spectrum Analyzer Open or close the Spectrum Analyzer window XM Series User Manual Page 39 A QUITEK Strip Chart Open or close the Strip Chart window ed Waveform Generator Open or close the Waveform Generator window Window Cascade Cascade all open child windows Tile Tile all open child windows Minimize All Minimize all open child windows Close Close the currently selected child window Help Contents Display help contents Acquitek Web Site Launch the default browser and direct to www Acquitek com About Display version and copyright information XM Series User Manual Page 40 CQUITEK DC Source DC Source EE ES Analog Out Channel o B Device Number nm E ES The DC Source is used to output a constant voltage on an analog output channel Analog Out Channel Zero based analog output channel number Device Number Data acquisition device number as configured in Acquitek Control Center You must assign a device number to the acquisition board before it can be used in Acquitek Bench or other application software XM Series User Manual Page 41 A QUITEK Logic Analyzer Logic Analyzer pla Time Base SE

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