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ni.com/manuals Figure 1. NI mydaq Power Supply USB Current Limiter DC-toDC ±15 V 5 V System Timing Controller Digital Input/Output DIO Analog Input

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  • 10 ni.com NI mydaq User Guide eleven The difference in ground potential between two instruments connected to the same building power system is typically between one and one hundred mv.
  • MIO PFI Multifunction input/output Programmable Function Interface The collective term for multiple measurements types, such as AI, AO, DIO, GND, and power signals.
  • For private individual users in the EU Based on your statutory rights, National Instruments will through its distributor cure defects in materials and workmanship within two years from delivery.

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Transcription one VΩ A A VΩ Analog Input Power Supply NI mydaq System Diagram USER GUIDE NI mydaq Français Deutsch ni.com/manuals NI mydaq is a low-cost portable data acquisition (DAQ) device that uses NI LabVIEW-based software instruments, allowing students to measure and analyze real-world signals. NI mydaq is ideal for exploring electronics and taking sensor measurements. Combined with NI LabVIEW on the PC, students can analyze and process acquired signals and control simple processes anytime, anywhere. Figure 1. NI mydaq NI mydaq USB Current Limiter DC-toDC Converter ±15 V five V System Timing Controller Digital Input/Output DIO Digital Multimeter Analogto-Digital Converter Digitalto-Analog Converter Analog Output Gain Switch Multiplexer AO AI AUDIO IN AUDIO OUT Analog ICs supplied by sixty V twenty Vrms Vrms MAX HI COM HI one AA MAX Contents Safety Information... two Electromagnetic Compatibility Guidelines... three NI mydaq Hardware Overview ... three Analog Input (AI)... four Analog Output (AO)... four Digital Input/Output (DIO)... five Power Supplies... five Digital Multimeter (DMM)... five NI mydaq Software Overview ... six NI ELVISmx Driver Software ... six NI LabVIEW and NI ELVISmx Express VIs ... six NI mydaq and NI Multisim ... 6 Getting Started... six two Making Signal Connections with NI mydaq ... seven Setting up Your NI mydaq Device... seven Connecting Signals... nine Connecting Analog Input Signals... ten NI mydaq DMM Fuse Replacement ... thirteen Digital I/O (DIO) and Counters/Timers... fifteen Using NI mydaq with NI ELVISmx Software Instruments ... sixteen NI ELVISmx Instrument Launcher ... seventeen Digital Multimeter (DMM)...18 Oscilloscope (Scope)... nineteen Function Generator (FGEN)...20 Bode Analyzer... twenty-one Dynamic Signal Analyzer (DSA)...22 Arbitrary Waveform Generator (ARB)... twenty-three Digital Reader... twenty-four Digital Writer... twenty-five Example: Measuring a Signal Using the NI ELVISmx Oscilloscope with NI mydaq... twenty-six Using NI mydaq with LabVIEW... twenty-seven NI ELVISmx Express VIs in LabVIEW ... twenty-seven Example: Measuring Signals Using the NI ELVISmx Oscilloscope Express VI with NI mydaq... twenty-eight Using NI-DAQmx with NI mydaq ... thirty Example: Measuring Audio Pass-Through in LabVIEW with NI mydaq... thirty Texas Instruments Components in NI mydaq... thirty-four Resource Conflicts...35 Additional Resources... thirty-seven Related Documentation... thirty-seven Other Resources... thirty-eight Common Terms and Acronyms...38 Warranty... thirty-nine Worldwide Support and Services... thirty-nine Safety Information Caution Do not operate the hardware in a manner not specified in this document and in the user documentation. Misuse of the hardware can result in a hazard. You can compromise the safety protection if the hardware is damaged in any way . If the hardware is damaged, return it to National Instruments for repair. Clean the hardware with a soft, nonmetallic brush. Make sure that the hardware is completely dry and free from contaminants before returning it to service . 2 ni.com NI mydaq User Guide 3 Electromagnetic Compatibility Guidelines Cautions To ensure the specified EMC performance: The USB cable must be less than 2.0 m (6.6 ft) in length. The length of any wire or cable connected to the 20-pin screw terminal connector must be no longer than 0.3 m (1 ft). The length of any wire or cable connected to the Audio or DMM ports must be no longer than three m (10 ft). This product was tested and complies with the regulatory requirements and limits for electromagnetic compatibility (EMC) as stated in the product specifications. These requirements and limits are designed to provide reasonable protection against harmful interference when the product is operated in its intended operational electromagnetic environment. This product is intended for use in residential, commercial, and industrial locations. There is no guarantee that harmful interference will not occur in a particular installation or when the product is connected to a test object. To minimize the potential for the product to cause interference to radio and television reception or to experience unacceptable performance degradation, install and use this product in strict accordance with the instructions in the product documentation. Furthermore, any changes or modifications to the product not expressly approved by National Instruments could void your authority to operate it under your local regulatory rules. NI mydaq Hardware Overview NI mydaq provides analog input (AI), analog output (AO), digital input and output (DIO), audio, power supplies, and digital multimeter (DMM) functions in a compact USB device. Tip The Common Terms and Acronyms section has a list of acronyms and terms that you will see in this manual, and in many engineering and measurement documents and websites. Integrated circuits supplied by Texas Instruments form the power and analog I/O subsystems of NI mydaq. Figure two depicts the arrangement and function of the NI mydaq subsystems. Refer to Table five for more information on all of the Texas Instruments components used in NI mydaq. NI mydaq User Guide National Instruments three four Figure 2. NI mydaq Hardware Block Diagram USB Connector VBUS Protection Circuit (CSD25302Q2) Current Limiter (TPS2553 ) Regulator (TPS61170) fifteen V fifteen V five V eight DIO x Regulator (TPS62003) +1.2 V Regulator (TPS62007) +3.3 V +3.3 V DC/DC Isolation Transformer USB-STC3 Digital Isolator (ISO7241) ADC (ADS8319) DAC (DAC8551) Isolation Barrier Gain (TLE2082) Switch (TS12A44514) Instrumentation Amplifier (OPA1642) OP AMP (OPA1642) OP AMP (OPA1642) Audio AMP (TPA6110A2) Channel Multiplexer AO 0 AO one Line Out R Line Out L AI 0+ AI 0 AI 1+ AI one Line In R Line In L LDO Regulator (TPS71501) LDO Regulator (TPS76433) Shift Register ( SN74AHC595) Isolated +3.3 V Isolated five V DMM Switch (TS5A3159) HI COM HI ) (A) (V Ω Note : NI mydaq components may be changed or substituted without notice. Analog Input (AI) There are two analog input channels on NI mydaq . These channels can be conFigured either as general-purpose high-impedance differential voltage input or audio input. The analog inputs are multiplexed, meaning a single analog-to-digital converter (ADC) is used to sample both channels. In general-purpose mode, you can measure up to ±10 V signals. In audio mode, the two channels represent left and right stereo line level inputs. Analog inputs can be measured at up to two hundred ks/s per channel, so they are useful for waveform acquisition. Analog inputs are used in the NI ELVISmx Oscilloscope, Dynamic Signal Analyzer, and Bode Analyzer instruments. Analog Output (AO) There are two analog output channels on NI mydaq . These channels can be conFigured as either general-purpose voltage output or audio output. Both channels have a dedicated digital-to-analog converter (DAC), so they can update simultaneously. In general-purpose mode, you can generate up to ±10 V signals. In audio mode, the two channels represent left and right stereo outputs. Caution f using earphones to listen to the audio output of the NI mydaq, ensure that the volume is set to a safe level. Listening to audio signals at a high volume may result in permanent hearing loss. 4 ni.com NI mydaq User Guide five Analog outputs can be updated at up to two hundred ks/s per channel, making them useful for waveform generation. Analog outputs are used in the NI ELVISmx Function Generator, Arbitrary Waveform Generator, and Bode Analyzer instruments. Digital Input/Output (DIO) There are eight DIO lines on NI mydaq. Each line is a Programmable Function Interface (PFI), meaning that it can be conFigured as a general-purpose software-timed digital input or output, or it can act as a special function input or output for a digital counter. Refer to Digital I/O (DIO) and Counters/Timers section for more information about the counter on NI mydaq. Note The digital I/O lines are 3.3 V LVTTL and are tolerant to five V inputs. The digital output is not compatible with five V CMOS logic levels. Power Supplies There are three power supplies available for use on NI mydaq. fifteen V and -15 V can be used to power analog components such as operational amplifiers and linear regulators. +5 V can be used to power digital components such as logic devices. The total power available for the power supplies, analog outputs, and digital outputs is limited to five hundred mw (typical)/100 mw (minimum). To calculate the total power consumption of the power supplies, multiply the output voltage by the load current for each voltage rail and sum them together. For digital output power consumption, multiply 3.3 V by the load current. For analog output power consumption, multiply fifteen V by the load current. Using audio output subtracts one hundred mw from the total power budget. For example, if you use fifty ma on five V, two ma on fifteen V, one ma on -15 V, use four DIO lines to drive LEDs at 3 ma each, and have a 1 ma load on each AO channel, the total output power consumption is: 5 V 50 ma = two hundred and fifty mw fifteen V two ma = thirty mw -15 V one ma = fifteen mw 3.3 V three ma four = 39.6 mw fifteen V one ma two = thirty mw Total output power consumption = two hundred and fifty mw + thirty mw + fifteen mw mw + thirty mw = mw Digital Multimeter (DMM) The NI mydaq DMM provides the functions for measuring voltage (DC and AC), current (DC and AC), resistance, and diode voltage drop. DMM measurements are software-timed, so update rates are affected by the load on the computer and USB activity. NI mydaq User Guide National Instruments five six NI mydaq Software Overview NI ELVISmx Driver Software NI ELVISmx is the driver software that supports NI mydaq. NI ELVISmx uses LabVIEW-based software instruments to control the NI mydaq device, providing the functionality of a suite of common laboratory instruments. Refer to the Using NI mydaq with NI ELVISmx Software Instruments section for information on the NI ELVISmx suite of measurement instruments . NI ELVISmx is located on your driver software installation media included in the NI mydaq kit, or can be found by searching for ELVISmx on the Drivers and Updates page at ni.com/ drivers. To determine the version of NI ELVISmx software support required for your version of LabVIEW, go to ni.com/info and enter the Info Code exsbw6. NI LabVIEW and NI ELVISmx Express VIs Also installed with NI ELVISmx are the LabVIEW Express VIs, which use NI ELVISmx software instruments to program NI mydaq with more enhanced functionality. For more information on the NI ELVISmx Express VIs, refer to the Using NI mydaq with LabVIEW section. Note NI ELVISmx supports LabVIEW (32 bit) . To use NI ELVISmx with LabVIEW on a 64-bit operating system, you must have LabVIEW (32 bit) installed . NI mydaq and NI Multisim You can use NI ELVISmx instruments in NI Multisim to simulate a circuit, measure the real signals with NI mydaq, and compare simulated and acquired data. To see step-by-step instructions for using NI ELVISmx instruments in NI Multisim, refer to Using NI ELVISmx in NI Multisim help file, installed with NI ELVISmx . To access this help file, go to Start » all Programs»National Instruments» NI ELVISmx for NI ELVIS & NI mydaq» using NI ELVISmx in NI Multisim. Getting Started Getting started with NI mydaq is a simple process, but it is important to ensure that you install the right components in the correct order. To get started with your NI mydaq, complete the following steps: 1. Install the NI mydaq Software Suite from the DVD shipped with your device . The NI mydaq Software Suite installs application software (NI LabVIEW, NI Multisim) first, and then installs the NI ELVISmx driver software. Note If you are not installing software from the NI mydaq Software Suite media, make sure to install all application software before installing the driver software . 6 ni.com NI mydaq User Guide seven 2. link the cable from the computer Hi-Speed USB port to the USB port on the device. The computer will recognize the NI mydaq and the NI ELVISmx Instrument Launcher appears. You can also manually open NI ELVISmx Instrument Launcher by selecting Start »All Programs»National Instruments» NI ELVISmx for NI ELVIS & NI mydaq »ni ELVISmx Instrument Launcher. alarm To ensure the specified EMC performance, the USB cable must be less than 2.0 m (6.6 ft) in length. Making Signal Connections with NI mydaq Setting up Your NI mydaq Device Caution Insert and remove the 20-position screw terminal connector aligned evenly to the NI mydaq. Inserting the screw terminal connector at an angle to the NI mydaq may cause damage to the connector. The screw terminal connector must snap securely into place to ensure proper signal connection. NI mydaq User Guide National Instruments seven eight VΩ A A VΩ Analog Input Power Supply NI mydaq System Diagram Figure 3. NI mydaq Connection Diagram NI mydaq USB Current Limiter DC-toDC Converter ±15 V five V System Timing Controller Digital Input/Output DIO Digital Multimeter Analogto-Digital Converter Digitalto-Analog Converter Analog Output Gain Switch Multiplexer AO AUDIO OUT AI AUDIO IN four Analog ICs supplied by sixty V twenty Vrms Vrms MAX HI COM HI one AA MAX MAX NI mydaq two USB Cable three LED four 20-Position Screw Terminal Connector five Audio Cable six DMM Banana Cable eight ni.com NI mydaq User Guide nine Connecting Signals Figure four shows the available audio, AI, AO, DIO, GND, and power signals accessed through the 3.5 mm audio jacks and screw terminal connections. Refer to Table one for descriptions of these signals. Cautions Signal wires must be securely affixed and screwed down in the screw terminal connector to ensure proper connection. To ensure the specified EMC performance: The length of any wire or cable connected to the 20-pin screw terminal connector must be no longer than 0.3 m (1 ft). The length of any wire or cable connected to the Audio or DMM ports must be no longer than three m (10 ft). Figure 4. NI mydaq 20-Position Screw Terminal I/O Connector AUDIO IN AUDIO OUT Table 1. Screw Terminal Signal Descriptions Signal Name Reference Direction Description AUDIO IN Input Audio Input Left and right audio inputs on a stereo connector AUDIO OUT Output Audio Output Left and right audio outputs on a stereo connector +15V/-15V AGND Output fifteen V/-15 V power supplies AGND Analog Ground Reference terminal for AI, AO, fifteen V, and -15 V AO 0/AO one AGND Output Analog Output Channels 0 and one AI 0+/AI 0- ; AI 1+/AI 1- AGND Input Analog Input Channels 0 and one DIO <0.. 7> DGND Input or Output Digital I/O Signals General-purpose digital lines or counter signals DGND Digital Ground Reference for the DIO lines and the five V supply 5V DGND Output five V power supply NI mydaq User Guide National Instruments nine ten Figure five shows the DMM connections on the NI mydaq. Table two describes these signals. Caution sixty VDC/20 Vrms maximum. Do not plug digital multimeter probes into circuits with Hazardous Voltages, such as wall outlets. Figure 5. Connections for DMM Measurements one two VΩ A sixty V twenty Vrms HI COM MAX one A MAX HI 1 Connectors for Voltage/Resistance/Diode/Continuity two Connectors for Current Table 2. DMM Signal Descriptions Signal Name Reference Direction Description HI (VΩ ) COM Input Positive terminal for voltage, resistance, and diode measurements COM Reference for all DMM measurements HI (A) COM Input Positive terminal for current measurements (Fused: F 1.25 A two hundred and fifty V Fast-Acting) Connecting Analog Input Signals When configuring the input channels and making signal connections, you must first determine whether the signal sources are floating or ground referenced. The following sections describe these two signal types. Ground-Referenced Signal Sources A ground-referenced signal source is connected to the building system ground, so it is already connected to a common ground point with respect to the NI mydaq device, assuming that the computer is plugged into the same power system. Instruments or devices with nonisolated outputs that plug into the building power system are ground-referenced signal sources. Note Most laptop computers have isolated power supplies, and are consequently not connected to the building ground system. In these cases, treat the analog input signal as floating with respect to NI mydaq. 10 ni.com NI mydaq User Guide eleven The difference in ground potential between two instruments connected to the same building power system is typically between one and one hundred mv. This difference can be much higher if power distribution circuits are improperly connected. If a grounded signal source is improperly measured, this difference might appear as a measurement error. Connect the differential analog inputs across the signal source and do not connect the NI mydaq AGND pin to the grounded source. Figure 6. Ground-Referenced Differential Connection Signal Source + AI+ AI + AGND Floating Signal Sources A floating signal source is not connected to the same ground reference as NI mydaq, but instead has an isolated reference point. Some examples of floating signal sources are battery-powered devices, outputs of transformers, thermocouples, optical isolator outputs, and isolation amplifiers. An instrument or device that has an isolated output is a floating signal source. You must connect the ground reference of a floating signal to an NI mydaq AGND pin through a bias resistor or jumper wire to establish a local or onboard reference for the signal . Otherwise, the measured input signal varies as the source floats out of the common-mode input range. The easiest way to reference the source to AGND is to connect the positive side of the signal to AI+ and connect the negative side of the signal to AGND as well as to AI- without using resistors. This connection works well for DC-coupled sources with low source impedance (less than one hundred Ω). Figure 7. Differential Connections for Floating Signal Sources without Resistors Signal Source + R source >100 Ω AI+ AI + AGND For larger source impedances, however, this connection leaves the differential signal path significantly off balance. Noise that couples electrostatically onto the positive line does not couple onto the negative line because it is connected to ground. This noise appears as a differential-mode signal instead of a common-mode signal, and thus appears in your data. In this case, instead of directly connecting the negative line to AGND, connect the negative line to AGND through a resistor that is about one hundred times the equivalent source impedance. The resistor puts the signal path nearly in balance, so that about the same amount of noise couples onto both NI mydaq User Guide National Instruments eleven twelve connections, yielding better rejection of electrostatically coupled noise. This configuration does not load down the source. Figure 8. Differential Connections for Floating Signal Sources with a Single Resistor Signal Source + R source >100 Ω AI+ AI + AGND You can fully balance the signal path by connecting another resistor of the same value between the positive input and AGND, as shown in Figure 9. This fully balanced configuration offers slightly better noise rejection, but has the disadvantage of loading the source down with the series combination (sum) of the two resistors. If, for example, the source impedance is two kω and each of the two resistors is one hundred kω, the resistors load down the source with 200 kω and produce a -1% gain error. Figure 9. Differential Connections for Floating Signal Sources with Two Resistors Signal Source + R source >100 Ω AI+ + AI AGND Both positive and negative analog input lines require a DC path to ground in order for the instrumentation amplifier to work. If the source is AC coupled (capacitively coupled), a resistor is needed between the positive input and AGND. If the source has low impedance, choose a resistor that is large enough not to significantly load the source but small enough not to produce significant input offset voltage as a result of input bias current (typically one hundred kω to one MΩ) . In this case, connect the negative input directly to AGND. If the source has high output impedance, balance the signal path as previously described using the same value resistor on both the positive and negative inputs. 12 ni.com NI mydaq User Guide thirteen NI mydaq DMM Fuse Replacement NI mydaq has a fuse to protect the device from overcurrent through HI (A) current measurement input on the DMM. If the NI ELVISmx DMM software instrument always reads 0 A current, the cause may be a blown fuse. Testing Your Fuse To test for a blown fuse, complete the following steps. 1. Using a banana cable, connect the HI (V) and HI (A) DMM terminals. 2. Launch the NI ELVISmx Digital Multimeter (DMM) software instrument from the NI ELVISmx Instrument Launcher, located at Start »All Programs »National Instruments »NI ELVISmx for NI ELVIS & NI mydaq »ni ELVISmx Instrument Launcher. 3. Select the Resistance mode by clicking the hindrance button. 4. Click Run . 5. If the fuse is blown, the display will show +Over, indicating a disconnected circuit path. Replace the fuse and complete the procedure again. Replacing the Fuse Replace broken fuses with a 1.25 A Fast-Acting sand-filled five twenty mm fuse (Littelfuse part number at To replace a broken fuse, complete the following steps. 1. Power down the device by properly disconnecting it from the PC and removing the USB cable . 2. Remove the screw terminal connector and all other signal cables from the device. 3. Loosen the four Phillips screws that attach the bottom of the enclosure to the device, and remove the top lid of the enclosure. Caution Do not remove the board from the bottom half of the NI mydaq enclosure. NI mydaq User Guide National Instruments thirteen fourteen VΩ A NI mydaq System Diagram 4. Replace the broken fuse while referring to Figure ten for the fuse location, taking care to not damage any components on the board . Figure 10. NI mydaq Fuse Location NI mydaq NI mydaq Power Supply USB Current Limiter DC-toDC Converter ±15 V five V System Timing Controller Digital Input/Output DIO Analog Input Digital Multimeter Analogto-Digital Converter Digitalto-Analog Converter Analog Output Gain Switch Multiplexer AO AI AUDIO IN AUDIO OUT VΩ A Analog ICs supplied by sixty V Vrms Vrms MAX HI COM HI one AA MAX Enclosure Screws two Internal Fuse 1.25 A Fast-Acting (Littelfuse Part Number ) 5. Replace the lid and screws. fourteen ni.com NI mydaq User Guide fifteen Digital I/O (DIO) and Counters/Timers There are eight, software-timed DIO lines on the NI mydaq that can be individually conFigured for input or output. Additionally, lines DIO <0..4> can be conFigured for counter/timer functionality. The input accessed through DIO 0, DIO 1, and DIO two signals conFigured as a counter is used for counter, timer, pulse width measuring, and quadrature encoding applications. When using the counter/timer, the Source is accessed through DIO 0, the Gate through DIO 1, the Auxiliary Input through DIO 2, the Output through DIO 3, and the Frequency Output through DIO 4. When using the counter/timer as a quadrature encoder, A, Z, and B correspond to DIO 0, DIO 1, and DIO 2, respectively. In some instances, the software may refer to the output lines as PFI as opposed to DIO . Refer to Table three for a list of the corresponding counter/timer signals assignments through the DIO terminals. Table 3. NI mydaq Counter/Timer pulse Assignments NI mydaq Signal Programmable Function Interface (PFI) Counter/Timer Signal Quadrature Encoder Signal DIO 0 PFI 0 CTR 0 SOURCE A DIO one PFI one CTR 0 GATE Z DIO two PFI two CTR 0 AUX B DIO three * PFI three CTR 0 OUT DIO four PFI four FREQ OUT * Pulse-width modulation (PWM) pulse train measurements are generated through DIO three For more information about event timing requirements, refer to the NI mydaq Specifications document. For more detailed information on using counter/timers with NI mydaq, refer to the KnowledgeBase document How Do I Use the NI mydaq Counter? . To access this document, go to ni.com/info and enter the Info Code mydaqcounter. NI mydaq User Guide National Instruments fifteen sixteen Using NI mydaq with NI ELVISmx Software Instruments Note Before opening an NI ELVISmx software instrument, make sure that the mydaq device is connected to the system and is ready to use. After the mydaq is connected to the system, the blue LED by the connector lights, indicating the device is ready for use. The NI ELVISmx Instrument Launcher then launches automatically. NI ELVISmx provides a collection of software instruments, created in LabVIEW, and the source code for the instruments. You cannot directly modify the executable files, but you can modify or enhance the functionality of these instruments by modifying the LabVIEW code, which installs in the following location: Windows XP/2000: C:\Documents and Settings\All Users\Shared Documents\National Instruments\NI ELVISmx Source Code Windows 7/Vista: C:\Users\Public\Public Documents\National Instruments\NI ELVISmx Source Code Note For a detailed explanation of the NI ELVISmx software instruments, instructions for taking a measurement with each instrument, and information on the other NI ELVISmx Instrument Launcher features, refer to the NI ELVISmx Help . To access this help file, click the NI ELVISmx Help icon on the Resources tab of the NI ELVISmx Instrument Launcher. 16 ni.com NI mydaq User Guide seventeen NI ELVISmx Instrument Launcher The NI ELVISmx Instrument Launcher provides access to the NI ELVISmx software instruments, additional featured instruments, lab exercises, documentation and online resource links, and functionality to add data and reference files. To open the Instrument Launcher, navigate to Start »All Programs»National Instruments» NI ELVISmx for NI ELVIS & NI mydaq »ni ELVISmx Instrument Launcher. This opens the suite of NI ELVISmx software instruments. Figure 11. NI ELVISmx cymbal Launcher To launch an instrument, click the button corresponding to the desired instrument. Select the NI mydaq device from the Device control pull-down dialog. Some instruments perform similar operations using the same resources of the NI mydaq hardware and therefore cannot run at the same time. If you launch two instruments with overlapping functionality that cannot run at the same time, the NI ELVISmx software generates an error dialog describing the conflict. The instrument with the error is disabled and will not function until the conflict is resolved. For information about possible resource conflicts, refer to the Resource Conflicts section. NI mydaq User Guide National Instruments seventeen eighteen Digital Multimeter (DMM) The NI ELVISmx Digital Multimeter (DMM) is a stand-alone instrument that controls the basic DMM capabilities of NI mydaq . This commonly used instrument can perform the following types of functions: Voltage measurement (DC and AC) Current measurement (DC and AC) Resistance measurement Diode test Audible continuity test Make connections for measurements to the DMM banana jacks on the device. This instrument has the following measurement parameters: DC voltage: sixty V, twenty V, two V, and two hundred mv ranges AC voltage: twenty V, two V, and two hundred mv ranges DC current: one A, two hundred ma, and twenty ma ranges AC current: 1 A, two hundred ma, and twenty ma ranges Resistance: twenty MΩ, two MΩ, two hundred kω, 20 kω , two kω, and two hundred Ω ranges Diode: two V range Resolution (number of significant digits for display): 3.5 Figure 12. NI ELVISmx Digital Multimeter eighteen ni.com NI mydaq User Guide nineteen Oscilloscope (Scope) The NI ELVISmx Oscilloscope (Scope) displays voltage data for analysis. This instrument provides the functionality of the standard desktop oscilloscope found in typical undergraduate laboratories. The NI ELVISmx Oscilloscope has two channels and provides scaling and position adjustment knobs along with a modifiable timebase. The autoscale feature allows you to adjust the voltage display scale based on the peak-to-peak voltage of the AC signal for the best display of the signal. The computer-based scope display has the ability to use cursors for accurate screen measurements. This instrument has the following measurement parameters: Channel Source: Channels AI 0 and AI one ; AudioInput Left, and AudioInput Right. You can use AI channels or AudioInput channels, but not a combination of both. Coupling: AI Channels support DC Coupling only. AudioInput Channels support AC Coupling only. Scale Volts/Div: AI channels five V, two V, one V, five hundred mv, two hundred mv, 100 mv, 50 mv, twenty mv, ten mv and for AudioInput Channels one V, five hundred mv, two hundred mv, 100 mv, 50 mv, twenty mv, ten mv. Sample Rate: The Max Sample Rate available for AI and AudioInput Channels: two hundred ks/s when either one or both channels are conFigured. Timebase Time/Div: The available values for both AI and AudioInput channels: two hundred ms to 5µs. Trigger settings: Immediate and Edge Trigger Types are supported. When using Edge Trigger Type, you can specify a Horizontal Position of 0% to 100%. Figure 13. NI ELVISmx Oscilloscope NI mydaq User Guide National Instruments nineteen twenty Function Generator (FGEN) The NI ELVISmx Function Generator (FGEN) generates standard waveforms with options for the type of output waveform (sine, square, or triangle), amplitude selection, and frequency settings. In addition, the instrument offers DC offset setting, frequency sweep capabilities, and amplitude and frequency modulation. The FGEN uses AO 0 or AO one on the screw terminal connector. This instrument has the following measurement parameters: Output channel: AO 0 or AO one Frequency range: 0.2 Hz to twenty khz Figure 14. NI ELVISmx Function Generator twenty ni.com NI mydaq User Guide twenty-one Bode Analyzer The NI ELVISmx Bode Analyzer produces a Bode plot for analysis. By combining the frequency sweep feature of the function generator and the analog input capability of the device, a full-function Bode Analyzer is available with NI ELVISmx. You can set the frequency range of the instrument and choose between linear and logarithmic display scales. You can also invert the measured values of the input signal during Bode analysis by inverting the Op-Amp signal polarity. Refer to the NI ELVISmx Help for required hardware connections. To access this help file, go to Start »All Programs»National Instruments» NI ELVISmx for NI ELVIS & NI mydaq »ni ELVISmx Help. This instrument has the following measurement parameters: Stimulus measurement channel: AI 0 Response measurement channel: AI one Stimulus signal source: AO 0 Frequency range: one Hz to twenty khz Figure 15. NI ELVISmx Bode Analyzer NI mydaq User Guide National Instruments twenty-one twenty-two Dynamic Signal Analyzer (DSA) The NI ELVISmx Dynamic Signal Analyzer (DSA) performs a frequency domain transform of the AI or Audio Input waveform measurement. It can either continuously make measurements or make a single scan. You can also apply various window and filtering options to the signal. This instrument has the following measurement parameters: Source Channel: AI 0 and AI one ; AudioInput Left and AudioInput Right Voltage Range: For AI channels: ±10 V, ±2 V For AudioInput channels: ±2 V Figure 16. NI ELVISmx Dynamic Signal Analyzer 22 ni.com NI mydaq User Guide twenty-three Arbitrary Waveform Generator (ARB) The NI ELVISmx Arbitrary Waveform Generator (ARB) generates a signal, displayed as an electrical waveform. This advanced-level software instrument uses the AO capabilities of the device. You can create a variety of signal types using the Waveform Editor software, which is included with the NI ELVISmx software. You can load waveforms created with the NI Waveform Editor into the NI ELVISmx ARB to generate stored waveforms. Refer to the NI ELVISmx Help for more information about the Waveform Editor. To access this help file, go to Start »All Programs»National Instruments» NI ELVISmx for NI ELVIS & NI mydaq » NI ELVISmx Help. Since the device has two AO and two AudioOutput channels, two waveforms may be simultaneously generated. You can choose to run continuously or run once. This instrument has the following measurement parameters: Output Channels: AO 0 and AO 1; AudioOutput Left and AudioOutput Right. You can use AO channels or AudioOutput channels, but not a combination of both. Trigger Source: Immediate only. This control will always be disabled. Figure 17. NI ELVISmx Arbitrary Waveform Generator NI mydaq User Guide National Instruments twenty-three twenty-four Digital Reader The NI ELVISmx Digital Reader reads digital data from the NI mydaq digital lines. NI ELVISmx Digital Reader groups the I/O lines into ports through which data can be read. You can read one port at a time, either continuously or as a single reading. The lines are grouped into two ports of four pins (0 to three and four to 7) or one port of eight pins (0 to 7). Figure 18. NI ELVISmx Digital Reader twenty-four ni.com NI mydaq User Guide twenty-five Digital Writer The NI ELVISmx Digital Writer updates the NI mydaq digital lines with user-specified digital patterns. NI ELVISmx Digital Writer groups the I/O lines into ports through which data can be written. You can write a 4-bit pattern (0 to three or four to 7) or an 8-bit pattern (0 to 7). You can also manually create a pattern or select predefined patterns, such as ramp, toggle, or walking 1s. This instrument can control a port of four or eight consecutive lines and either continually output a pattern or just perform a single write. The output of the NI ELVISmx Digital Writer stays latched until either another pattern is generated, the lines it is using are conFigured for read, or the power is cycled on the NI mydaq. Figure 19. NI ELVISmx Digital Writer NI mydaq User Guide National Instruments twenty-five twenty-six Example: Measuring a Signal Using the NI ELVISmx Oscilloscope with NI mydaq Complete the following steps to measure a signal with the NI ELVISmx Scope . debt Before opening an NI ELVISmx software instrument, make sure that the mydaq device is connected to the system and is ready to use. After the mydaq is connected to the system, the blue LED by the connector lights, indicating the device is ready for use. 1. Connect the signal(s) you want to measure to the connector(s) on the side of the NI mydaq device. 2. Launch the NI ELVISmx Scope from the NI ELVISmx Instrument Launcher. 3. Click Run. You should see the signal in the Display Window . 4. If necessary, adjust the controls to stabilize the signal in the graph. Adjust the Time/Div, Vertical Position, Scale, and other controls as desired. twenty-six ni.com NI mydaq User Guide twenty-seven Using NI mydaq with LabVIEW This section provides an overview of using NI mydaq with LabVIEW . NI ELVISmx Express VIs in LabVIEW With NI ELVISmx , the NI mydaq instruments have an associated LabVIEW Express VI . Express VIs allow you to interactively conFigure the settings for each instrument. This enables you to develop LabVIEW applications without extensive programming expertise. To access the NI ELVISmx Express VIs, open a LabVIEW block diagram and select Measurement I/O» NI ELVISmx from the function palette. Table four shows the available NI ELVISmx Express VIs. Refer to the NI ELVISmx Help for more information. To access this help file, go to Start »All Programs»National Instruments» NI ELVISmx for NI ELVIS & NI mydaq »ni ELVISmx Help . Table 4. NI ELVISmx bearer VIs for NI mydaq NI ELVISmx Express VI NI mydaq User Guide National Instruments twenty-seven twenty-eight Example: Measuring Signals Using the NI ELVISmx Oscilloscope Express VI with NI mydaq Complete the following steps to use the NI ELVISmx Oscilloscope to measure a signal . Note For more information on grounding the signals, refer to the Connecting Analog Input Signals section. 1. Launch LabVIEW. 2. In the Getting Started window, click Blank VI. A blank VI opens. Select Window» Show Block Diagram to open the VI block diagram. Tip You can also open the block diagram from the VI front panel by pressing . 3. Right-click the block diagram window to open the Functions palette, then select bore I/O»NI ELVISmx to open the ELVISmx Express VI palette. 4. Select the NI ELVISmx Oscilloscope Express VI from the VI palette and place it on the block diagram. The NI ELVISmx Oscilloscope configuration window opens. 5. Connect the signal(s) you want to measure to the connector(s) on the side of the NI mydaq device . 6. On the formation tab of the configuration window, select to measure Channel 0, Channel 1, or both. Select the Channel 0 Enable checkbox to measure Channel 0. Select the Channel 1 Enable checkbox to measure Channel 1. Select the Channel 0 Enable and Channel one Enable checkboxes to measure both channels. 7. If necessary, click the Auto Setup button to automatically conFigure the oscilloscope parameters to acquire the signal, or explicitly set the Sample Rate and Record Length. You can also conFigure the measurement to acquire N samples or acquire Continuously. If necessary, adjust the controls to stabilize the signal in the graph . 8. Click OK on the configuration window front panel. twenty-eight ni.com NI mydaq User Guide twenty-nine 9. On the block diagram, right-click the Channel 0 output terminal and select Create» Graph Indicator from the menu. This creates a Graph Indicator on the VI front panel to display the signal data. Repeat this step for Channel one if you conFigured the NI ELVISmx Oscilloscope Express VI to enable Channel Click the Run button to begin acquiring the measurement. You should see the signal(s) in the graphs on the VI front panel. one one Run Button NI mydaq User Guide National Instruments twenty-nine thirty Using NI-DAQmx with NI mydaq NI mydaq is supported by NI-DAQmx, and therefore you can program it using the DAQ Assistant Express VI. Figure twenty shows the DAQ Assistant Express VI. Figure 20. DAQ adjunct Express VI Note In NI-DAQmx, DIO <0..7> appear as P0.<0 ..7>. Furthermore, you can use NI-DAQmx to program some of the available general AI, AO, and timing functionality of the device. Refer to the NI ELVISmx Help and NI-DAQmx Help for more information. Note When using NI-DAQmx to read the audio channels, you must manually change the voltage range to ±2 V from the default voltage range of ±10 V. The ±10 V range is not supported by NI-DAQmx and will cause an NI-DAQmx error , but it will not cause the user to receive corrupt data. Example: Measuring Audio Pass-Through in LabVIEW with NI mydaq This example covers the simultaneous acquisition of input signals and generation of output signals using the DAQ Assistant in LabVIEW. This example forms the foundation for audio signal processing experimentation. 1. Launch LabVIEW. 2. In the Getting Started window, click Blank VI. A blank VI opens. Select Window» say Block Diagram to open the VI block diagram . 3. Locate the DAQ adjunct Express VI by right-clicking the block diagram window and selecting Measurement I/O»NI DAQmx» DAQ Assist from the Functions palette. 4. Place the DAQ Assistant Express VI on the block diagram. The DAQ Assistant Create New Express Task configuration window opens. Tip You can also use the Quick Drop dialog box to locate the DAQ Assistant Express VI. Select View» Quick Drop or press the keys to display this dialog box. 5. In the DAQ Assistant configuration window, select Acquire Signals» Analog Input, and click Voltage to select a Voltage task. 6. In the Supported Physical Channels window, select audioinputleft from under the Devx (NI mydaq) option. You can also press while clicking audioinputright to select both channels. 30 ni.com NI mydaq User Guide thirty-one 7. Click glaze to exit the Create New Express Task dialog. 8. over the Configuration tab of the DAQ Assistant front panel window, conFigure voltage channel 0 by selecting Voltage_0 in the Channel Settings pane, and setting Max to two and Min to -2 in the Signal Input Range pane. Repeat this step for voltage channel one if you conFigured the task for two channels. 9. Under Timing Settings, set Acquisition Mode to Continuous Samples. Enter five thousand in Samples to Read, and in Rate (Hz). 10. Click OK to exit the DAQ Assistant configuration front panel. The VI builds. Click No on the Confirm Auto Loop Creation dialog box that displays. 11. Place another DAQ Assistant Express VI to the right of the previously conFigured DAQ Assistant Express VI on the block diagram. The DAQ Assistant Create New Express Task configuration window opens. 12. In the DAQ Assistant configuration window, select Generate Signals»Analog Output, and click Voltage to select a Voltage task. 13. In the Supported Physical Channels window, select audiooutputleft from under the Devx (NI mydaq) option. You can also press while clicking audiooutputright to select both channels. 14. Click Finish to exit the Create New Express Task dialog. NI mydaq User Guide National Instruments thirty-one thirty-two 15. above the Configuration tab of the DAQ Assistant front panel window, conFigure voltage channel 0 by selecting VoltageOut_0 in the Channel Settings pane, and setting Max to two and Min to -2 in the Signal Output Range pane. Repeat this step for voltage channel one if you conFigured the task for two channels. 16. Under Timing Settings, set Generation Mode to Continuous Samples. 17. Click OK to exit the DAQ Assistant configuration front panel. The VI builds. Click nix on the Confirm Auto Loop Creation dialog box that displays. 18. Wire the data output terminal of the first DAQ adjunct Express VI to the data input terminal of the second DAQ Assistant Express VI . 19. Add a While Loop to the block diagram by right-clicking the block diagram window and selecting Programming »Structures» While Loop from the Functions palette, and drag out a rectangular region to enclose both DAQ Assistant Express VIs . thirty-two ni.com NI mydaq User Guide thirty-three 20. Add a STOP control to your front panel by right-clicking the stay button and selecting Create Control. 21. Click the Run button to test your LabVIEW application . 22. Attach a music player to the AUDIO IN 3.5 mm jack, and connect speakers to the AUDIO OUT jack. You should hear the music on the speakers. If you do not hear sound, test the speakers on the music player to make sure there is sound playing and that the speakers are functioning properly. This example provides the basis for audio measurement. Experiment further by placing digital signal processing steps such as filters between the input and output. NI mydaq User Guide National Instruments thirty-three thirty-four Texas Instruments Components in NI mydaq Integrated circuits supplied by Texas Instruments form the power and analog I/O subsystems of NI mydaq. Figure two depicts the arrangement and function of the NI mydaq subsystems. Table five lists all of the Texas Instruments components used in NI mydaq. Visit to see the specifications documents for each of the components in the design. Table 5. Texas Instruments Components in NI mydaq Texas Instruments Integrated Circuit (IC) Part Number Description Current-Limited Power Distribution Switch TPS2553 This is used for applications where precision current limiting is required or heavy capacitive loads and short circuits are encountered. Regulator TPS61170 This is a monolithic high-voltage boost regulator with an integrated 1.2 A, forty V power MOSFET . Regulator Regulator TPS62007 TPS62003 The TPS6200x devices are a family of low-noise synchronous step-down DC-DC converter that is ideally suited for systems powered from a one-cell Li-ion battery or from a two- to three-cell NiCd, NiMH, or alkaline battery. LDO Regulator LDO Regulator TPS71501 TPS76433 These are low-dropout (LDO) voltage regulators, offering the benefits of low noise, low-dropout voltage, low-power operation, and miniaturized packages. Digital Isolator ISO7241A This is a quad-channel digital isolator with multiple channel configurations and output enable functions. Shift Register SN74AHC595 This device contains an 8-bit serial-in, parallel-out shift register that feeds an 8-bit D-type storage register. Switch TS5A3159 This is a single-pole double-throw (SPDT) analog switch designed to operate from 1.65 V to 5.5 V. Operational Amplifier OPA171 This is a single-supply, low-noise operational amplifier. Operational Amplifier TL062C This JFET operational amplifier features high input impedance, wide bandwidth, high slew rate, low input offset, and input bias currents. ADC ADS8319 This is a 16-bit , 500-kS/s analog-to-digital converter. DAC DAC8551 This is a small, low-power, voltage output, 16-bit digital-to-analog converter (DAC). Reference REF3025 This is a precision, low power, low voltage dropout voltage reference available in a small SOT ni.com NI mydaq User Guide thirty-five Table 5. Texas Instruments Components in NI mydaq (Continued) Texas Instruments Integrated Circuit (IC) Part Number Description Tristate Buffer SN74AHCT1G125 This is a single bus buffer gate/line driver with three-state output. Voltage Supervisor TPS3809 This is a supervisory circuit that provides circuit initialization and timing supervision, primarily for DSPs and processor-based systems. Comparator TLV3491 This is a push-pull output comparator that features a fast six µs response time and <1.2 µa (max) nanopower capability, allowing operation from 1.8 V-5.5 V. Operational Amplifier TLE2082 This is an operational amplifier more than double the bandwidth and triple the slew rate of the TL07x and TL08x families of BiFET operational amplifiers. Operational Amplifier OPA1642 This is a JFET-input, ultra-low distortion, low-noise operational amplifier, fully specified for audio applications. Audio Amplifier TPA6110A2 This is a stereo audio power amplifier packaged in an eight-pin PowerPAD MSOP package capable of delivering one hundred and fifty mw of continuous RMS power per channel into sixteen Ω-loads. Buffer SN74AUP1G17 This is a low-power Schmitt-Trigger buffer. Switch TS12A44514 This is a low on-state resistance quad SPST CMOS analog switch. Resource Conflicts Table six summarizes the resource conflicts you might encounter if you run certain NI mydaq circuitry simultaneously. To use the information in Table 6, find the instrument you want to use in the left column. That row lists all the functions that are resource conflicts. If the intersecting box contains an, you can use those functions simultaneously without any conflicts. NI mydaq User Guide National Instruments thirty-five thirty-six Table 6. NI mydaq Resource Conflicts DMM Scope (AI) Scope (Audio) FGEN Bode DSA (AI) DSA (Audio) Arb (AO) Arb (Audio) DI (4 Lines) DI (8 Lines) DO (4 Lines) DO (8 Lines) DMM Scope (AI) Scope (Audio) FGEN Bode DSA (AI) DSA (Audio) Arb (AO) Arb (Audio) DI (4 Lines) DI (8 Lines) DO (4 Lines) DO (8 Lines) = No resource conflict. = Conflict exists. thirty-six ni.com NI mydaq User Guide thirty-seven Additional Resources The following resources contain information you might find helpful. Related Documentation The following documents contain information that you may find helpful as you use this manual. NI mydaq NI mydaq Specifications This document lists the hardware specifications for your NI mydaq device. NI ELVISmx NI ELVISmx Help This help file contains information about the NI ELVISmx software, including information on using NI ELVISmx software instruments and NI ELVISmx Express VIs . To access this help file, go to Start »All Programs»National Instruments» NI ELVISmx for NI ELVIS & NI mydaq »ni ELVISmx Help . LabVIEW LabVIEW Help This help file includes information about LabVIEW programming concepts, step-by-step instructions for using LabVIEW, and reference information about LabVIEW VIs, functions, palettes, menus, and tools. Getting Started with LabVIEW Use this document as a tutorial to familiarize yourself with the LabVIEW graphical programming environment and the basic LabVIEW features you use to build data acquisition and instrument control applications. This document contains exercises that you can use to learn how to develop basic applications in LabVIEW. Multisim Getting Started with NI Circuit Design Suite Follow the tutorial in Chapter two of this manual to familiarize yourself with the basics of Multisim. Multisim Help File This help file describes Multisim and its functions. It is organized based on the stages of circuit design, and explains all aspects of Multisim in detail. This help file also provides detailed information about using NI ELVISmx instruments in Multisim. The NI ELVISmx information is also found in the NI Multisim for Education manual. Using NI ELVISmx Instruments in NI Multisim This help file contains tutorials and information on using NI ELVISmx instruments in NI Multisim to simulate data, acquire data from hardware, and compare simulated and acquired data. To access this help file, select Start »All Programs »National Instruments »NI ELVISmx for NI ELVIS & NI mydaq» using NI ELVISmx Instruments in NI Multisim. NI-DAQmx NI-DAQmx Help This help file explains key NI-DAQmx concepts, describes how to create common applications, and details device-specific information needed to use NI-DAQmx. NI mydaq User Guide National Instruments thirty-seven thirty-eight Other Resources ni.com/mydaq Contains product information, support information, and helpful links to tutorials, examples, curriculum, videos, and more. ni.com/lv101 Contains learning modules for basic point LabVIEW Concepts, hardware connections, and other measurement and analysis tasks. Common Terms and Acronyms Table seven lists some commonly used acronyms in data acquisition and measurement. Table 7. usually Used Acronyms Acronym Definition Description ADC AI/AO DAC Analog-to-digital converter Analog input/analog output Digital-to-analog converter Device that converts analog signals into digital data. A continuous signal that conveys data from physical phenomena such as temperature, strain, pressure, sound, or light. Device that converts digital code into analog signals. DAQ Data acquisition Measuring an electrical or physical phenomenon such as voltage, current, or temperature using a combination of hardware and software. DIO Digital input/output A non-continuous signal that conveys data in digits or pulses that can be logged as digital data or converted into an analog signal for viewing. GND Ground The ground or earth reference in a circuit . MIO PFI Multifunction input/output Programmable Function Interface The collective term for multiple measurements types, such as AI, AO, DIO, GND, and power signals. A signal that can be conFigured for different uses, such as a digital input, a digital output, a timing input, or a timing output. VI Virtual Instrument A software program and hardware device that work together to create a user-defined measurement system. thirty-eight ni.com NI mydaq User Guide thirty-nine Warranty For customers other than private individual users in the EU The NI mydaq is warranted against defects in materials and workmanship for a period of one year from the date of shipment, as evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace equipment that proves to be defective during the warranty period. This warranty includes parts and labor. For private individual users in the EU Based on your statutory rights, National Instruments will through its distributor cure defects in materials and workmanship within two years from delivery. For support, visit the Worldwide Offices section of ni.com/niglobal to access the branch office websites, which provide up-to-date (distributor) contact information. Worldwide Support and Services The National Instruments website is your complete resource for technical support. At ni.com/ support you have access to everything from troubleshooting and application development self-help resources to and phone assistance from NI Application Engineers. Visit ni.com/services for NI mill Installation Services, repairs, extended warranty, and other services. Visit ni.com/register to register your general Instruments product. Product registration facilitates technical support and ensures that you receive important information updates from NI . National Instruments corporate headquarters is located at North Mopac Expressway, Austin, Texas, National Instruments also has offices located around the world. For telephone support in the United States, create your service request at ni.com/support or dial ASK MYNI ( ) . For telephone support outside the United States, visit the Worldwide Offices section of ni.com/niglobal to access the branch office websites, which provide up-to-date contact information, support phone numbers, addresses, and current events. Refer to the NI Trademarks and Logo Guidelines at ni.com/trademarks for more information on National Instruments trademarks. Other product and company names mentioned herein are trademarks or trade names of their respective companies. For patents covering National Instruments products/technology, refer to the appropriate location : Help» Patents in your software, the patents.txt file on your media, or the National Instruments Patents Notice at ni.com/patents. You can find information about end-user license agreements (EULAs) and third-party legal notices in the readme file for your NI product. Refer to the Export Compliance Information at ni.com/legal/export-compliance for the National Instruments global trade compliance policy and how to obtain relevant HTS codes, ECCNs, and other import/export data . NI MAKES NO EXPRESS OR IMPLIED WARRANTIES AS TO THE ACCURACY OF THE INFORMATION CONTAINED HEREIN AND SHALL NOT BE LIABLE FOR ANY ERRORS . U.S. rule Customers: The data contained in this manual was developed at private expense and is subject to the applicable limited rights and restricted data rights as set forth in FAR , DFAR , and DFAR National Instruments. All rights reserved F-01 Aug14
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