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Chapter 4

Analog Input

National Instruments

4-15

X Series User Manual

Using Differential Connections for Floating Signal
Sources

It is important to connect the negative lead of a floating so

rce to AI GND

(either directly or thro

gh a bias resistor). Otherwise, the so

rce may float

t of the maxim

m working voltage range of the NI-PGIA and the DAQ

device ret

rns erroneo

s data.

The easiest way to reference the so

rce to AI GND is to connect the

positive side of the signal to AI+ and connect the negative side of the signal
to AI GND as well as to AI– witho

sing resistors. This connection works

well for DC-co

pled so

rces with low so

rce impedance (less than 100

Figure 4-4.

Differential Connections for Floating Signal Sources without Bias Resistors

However, for larger so

rce impedances, this connection leaves the DIFF

signal path significantly off balance. Noise that co

ples electrostatically

onto the positive line does not co

ple onto the negative line beca

se it is

connected to gro

nd. This noise appears as a differential mode signal

instead of a common-mode signal, and th

s appears in yo

r data. In this

case, instead of directly connecting the negative line to AI GND, connect
the negative line to AI GND thro

gh a resistor that is abo

t 100 times the

ivalent so

rce impedance. The resistor p

ts the signal path nearly in

balance, so that abo

t the same amo

nt of noise co

ples onto both

connections, yielding better rejection of electrostatically co

pled noise.

This config

ration does not load down the so

rce (other than the very high

inp

t impedance of the NI-PGIA).

–

Inped

nce

<100

AI GND

AI+

AI–

Flo

ting

ign

rce

MIO X

erie

Device

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Содержание DAQ X Series

Страница 1: ...erutilized and idle equipment along with credit for buybacks and trade ins Custom engineering so your equipment works exactly as you specify Critical and expedited services Leasing Rentals Demos In st...

Страница 2: ...ries User Manual NI 632x 634x 635x 636x Devices X Series User Manual ni com manuals Deutsch Fran ais February 2012 370784D 01 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE...

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Страница 6: ...ation when the product is connected to a test object or if the product is used in residential areas To minimize the potential for the product to cause interference to radio and television reception or...

Страница 7: ...y Cable Slot 1 8 Device Pinouts 1 8 Device Specifications 1 8 Device Accessories and Cables 1 8 Chapter 2 DAQ System Overview DAQ Hardware 2 1 DAQ STC3 2 2 Calibration Circuitry 2 3 Cables and Accesso...

Страница 8: ...Software 4 6 Multichannel Scanning Considerations 4 6 Analog Input Data Acquisition Methods 4 9 Software Timed Acquisitions 4 10 Hardware Timed Acquisitions 4 10 Analog Input Triggering 4 11 Connecti...

Страница 9: ...Signal 4 34 AI Start Trigger Signal 4 35 AI Reference Trigger Signal 4 37 AI Pause Trigger Signal 4 38 Getting Started with AI Applications in Software 4 40 Analog Input on Simultaneous MIO X Series D...

Страница 10: ...O Pause Trigger Signal to an Output Terminal 5 10 AO Sample Clock Signal 5 10 Using an Internal Source 5 10 Using an External Source 5 11 Routing AO Sample Clock Signal to an Output Terminal 5 11 Othe...

Страница 11: ...ion 6 16 DO Sample Clock Signal 6 17 Using an Internal Source 6 17 Using an External Source 6 17 Routing DO Sample Clock to an Output Terminal 6 18 Other Timing Requirements 6 18 DO Sample Clock Timeb...

Страница 12: ...12 Implicit Buffered Semi Period Measurement 7 12 Frequency Measurement 7 13 Low Frequency with One Counter 7 13 High Frequency with Two Counters 7 14 Large Range of Frequencies with Two Counters 7 15...

Страница 13: ...ounter n Source 7 42 Routing Counter n Source to an Output Terminal 7 42 Counter n Gate Signal 7 43 Routing a Signal to Counter n Gate 7 43 Routing Counter n Gate to an Output Terminal 7 43 Counter n...

Страница 14: ...I O Protection 8 7 Programmable Power Up States 8 7 Chapter 9 Digital Routing and Clock Generation Clock Routing 9 1 100 MHz Timebase 9 2 20 MHz Timebase 9 2 100 kHz Timebase 9 2 External Reference C...

Страница 15: ...APFI 0 1 Terminals 11 3 Analog Input Channels 11 3 Analog Input Channels on MIO X Series Devices 11 4 Analog Input Channels on Simultaneous MIO X Series Devices 11 4 Analog Trigger Actions 11 4 Routi...

Страница 16: ...USB 6351 6361 Screw Terminal Pinout A 13 Figure A 8 NI USB 6361 Mass Termination Pinout A 14 Figure A 9 NI PCIe 6353 and NI PCIe PXIe 6363 Pinout A 16 Figure A 10 NI USB 6363 Mass Termination Pinout A...

Страница 17: ...es you of precautions to take to avoid injury data loss or a system crash When this symbol is marked on a product refer to the Read Me First Safety and Electromagnetic Compatibility for information ab...

Страница 18: ...ts Select Start All Programs National Instruments NI DAQ NI DAQmx Help LabVIEW If you are a new user use the Getting Started with LabVIEW manual to familiarize yourself with the LabVIEW graphical prog...

Страница 19: ...s CVI Help Measurement Studio If you program your NI DAQmx supported device in Measurement Studio using Visual C Visual C or Visual Basic NET you can interactively create channels and tasks by launchi...

Страница 20: ...e Help describes the NI DAQmx Library functions which you can use with National Instruments data acquisition devices to develop instrumentation acquisition and control applications Select Start All Pr...

Страница 21: ...6 6358 Specifications contains all specifications for the NI 6356 and NI 6358 Simultaneous MIO X Series devices The NI 6361 6363 Specifications contains all specifications for the NI 6361 and NI 6363...

Страница 22: ...nuals are available as PDFs You must have Adobe Acrobat Reader with Search and Accessibility 5 0 5 or later installed to view the PDFs Refer to the Adobe Systems Incorporated Web site at www adobe com...

Страница 23: ...ng software and hardware configuring channels and tasks and getting started developing an application 3 Installing the hardware Unpack your X Series device as described in the Unpacking section The DA...

Страница 24: ...up time This function measures the onboard reference voltage of the device and adjusts the self calibration constants to account for any errors caused by short term fluctuations in the environment You...

Страница 25: ...through the chassis ground The wire should be AWG 16 or larger solid copper wire with a maximum length of 1 5 m 5 ft Attach the wire to the earth ground of the facility s power system For more inform...

Страница 26: ...he end of the power cable as practical Install the snap on ferrite bead by opening the housing and looping the power cable once through the center of the ferrite Close the ferrite bead until the locki...

Страница 27: ...81514 01 not included in your X Series USB device kit Refer to Figure 1 3 1 Use three 8 32 flathead screws to attach the backpanel wall mount to the panel wall Tighten the screws with a 2 Phillips scr...

Страница 28: ...f the backpanel wall mount using a 1 Phillips screwdriver and four machine screws part number 740981 01 included in the kit as shown in Figure 1 4 Tighten the screws to a torque of 0 4 N m 3 6 lb in F...

Страница 29: ...SB Device LED Patterns section of Chapter 3 Connector and LED Information for information about the X Series USB device READY and ACTIVE LEDs USB Cable Strain Relief NI USB 634x 635x 636x Devices You...

Страница 30: ...lock cables Device Pinouts Refer to Appendix A Device Specific Information for X Series device pinouts Device Specifications Refer to the specifications document for your device NI 632x Specification...

Страница 31: ...onents of a typical DAQ system Figure 2 1 Components of a Typical DAQ System DAQ Hardware DAQ hardware digitizes signals performs D A conversions to generate analog output signals and measures and con...

Страница 32: ...d routing of internal and external timing signals Four flexible 32 bit counter timer modules with hardware gating Digital waveform acquisition and generation Static DIO signals True 5 V high current d...

Страница 33: ...lp for more information about using calibration constants For a detailed calibration procedure for X Series devices refer to the B E M S X Series Calibration Procedure by clicking Manual Calibration P...

Страница 34: ...4 Analog Input for information about how to select accessories for your X Series device This section describes some cable and accessory options for X Series devices with one or two 68 pin connectors...

Страница 35: ...fer to the SCC Configuration Guide available by going to ni com info and entering the Info Code rdscav for more information BNC Accessories You can use the SHC68 68 EPM shielded cable to connect your...

Страница 36: ...es Use RTSI bus cables to connect timing and synchronization signals among PCI PCI Express devices such as X Series M Series CAN and other measurement vision and motion devices Since PXI devices use P...

Страница 37: ...and digital sections of the cable Failure to do so results in noise coupling into the analog signals from transient digital signals For more information about the connectors used for DAQ devices refer...

Страница 38: ...citation currents or voltages bridge completion linearization or high amplification for proper and accurate operation Therefore most computer based measurement systems include some form of signal cond...

Страница 39: ...uiring high speed acquisition Note NI 6356 6358 6366 6368 Devices Simultaneous MIO SMIO X Series devices only support controlling SCXI in parallel mode System features include the following Modular ar...

Страница 40: ...evices do not support SCC Programming Devices in Software National Instruments measurement devices are packaged with NI DAQmx driver software an extensive library of functions and VIs you can call fro...

Страница 41: ...DAQmx 9 0 and later NI PCIe PXIe 6351 6353 6361 6363 NI DAQmx 9 0 and later NI PXIe 6356 6358 6366 6368 NI DAQmx 9 0 2 and later NI USB 6361 6363 Mass Termination NI DAQmx 9 5 and later NI USB 6366 M...

Страница 42: ...PCI Express Device Disk Drive Power Connector and RTSI Connector Pinout sections refer to X Series PCI Express device power and the RTSI connector on PCI Express devices The USB Device LED Patterns s...

Страница 43: ...efer to the Connecting Ground Referenced Signal Sources section of Chapter 4 Analog Input Simultaneous MIO X Series Devices For differential measurements on Simultaneous MIO X Series devices AI 0 and...

Страница 44: ...o the specifications for your device 5 V D GND Output 5 V Power Source These terminals provide a fused 5 V power source Refer to the 5 V Power Source section for more information PFI 0 7 P1 0 7 PFI 8...

Страница 45: ...tall the disk drive power connector in either of the following situations You need more power than listed in the device specifications You are using an SCC accessory without an external power supply s...

Страница 46: ...indicates activity over the bus The READY LED indicates whether or not the device is configured Table 3 2 shows the behavior of the LEDs 1 Device Disk Drive Power Connector 2 PC Disk Drive Power Conn...

Страница 47: ...es devices Figure 4 1 MIO X Series Analog Input Circuitry The main blocks featured in the MIO X Series device analog input circuitry are as follows I O Connector You can connect analog input signals t...

Страница 48: ...al converter ADC digitizes the AI signal by converting the analog voltage into a digital number AI FIFO MIO X Series devices can perform both single and multiple A D conversions of a fixed or infinite...

Страница 49: ...smaller input range improves the voltage resolution but may result in the input signal going out of range For more information about setting ranges refer to the NI DAQmx Help or the LabVIEW Help Table...

Страница 50: ...ound reference settings Differential mode In DIFF mode the MIO X Series device measures the difference in voltage between two AI signals Referenced single ended mode In RSE mode the MIO X Series devic...

Страница 51: ...rating of AI signals with respect to ground and for signal pairs in differential mode with respect to each other are listed in the specifications document for your device Exceeding the maximum input v...

Страница 52: ...to the DAQ Assistant Help for more information about the DAQ Assistant To configure the input mode of your voltage measurement using the NI DAQmx C API set the terminalConfig property Refer to the NI...

Страница 53: ...f the source connected to channel 1 is high enough the resulting reading of channel 1 can be partially affected by the voltage on channel 0 This effect is referred to as ghosting If your source impeda...

Страница 54: ...connect an input channel to ground Then insert this channel in the scan list between two of your signal channels The input range of the grounded channel should match the input range of the signal afte...

Страница 55: ...ire 1 000 points from each channel at a scan rate of 500 kS s Both methods take the same amount of time Doubling the number of samples averaged from 500 to 1 000 decreases the effect of noise by a fac...

Страница 56: ...single point HWTSP A buffer is a temporary storage in computer memory for to be transferred samples Buffered In a buffered acquisition data is moved from the DAQ device s onboard FIFO memory to a PC b...

Страница 57: ...k function provide tight synchronization between the software layer and the hardware layer Refer to the NI Developer Zone document NI DAQmx Hardware Timed Single Point Lateness Checking for more infor...

Страница 58: ...nded RSE Refer to the Analog Input Ground Reference Settings section for descriptions of the RSE NRSE and DIFF modes and software considerations Refer to the Connecting Ground Referenced Signal Source...

Страница 59: ...ground reference point or return signal The signal leads travel through noisy environments Two analog input channels AI and AI are available for the signal DIFF signal connections reduce noise pickup...

Страница 60: ...input signal can share a common reference point AI GND with other signals that use RSE The input signal is high level greater than 1 V The leads connecting the signal to the device are less than 3 m 1...

Страница 61: ...impedances this connection leaves the DIFF signal path significantly off balance Noise that couples electrostatically onto the positive line does not couple onto the negative line because it is connec...

Страница 62: ...iguration 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 2 k and...

Страница 63: ...nt input offset voltage as a result of input bias current typically 100 k to 1 M In this case connect the negative input directly to AI GND If the source has high output impedance balance the signal p...

Страница 64: ...urce connected to the DAQ device in NRSE mode Figure 4 8 NRSE Connections for Floating Signal Sources All of the bias resistor configurations discussed in the Using Differential Connections for Floati...

Страница 65: ...erenced Single Ended RSE Connections for Floating Signal Sources Figure 4 9 shows how to connect a floating signal source to the MIO X Series device configured for RSE mode Figure 4 9 RSE Connections...

Страница 66: ...ement error Follow the connection instructions for grounded signal sources to eliminate this ground potential difference from the measured signal When to Use Differential Connections with Ground Refer...

Страница 67: ...pling is proportional to the area between the two signal conductors Electrical coupling is a function of how much the electric field differs between the two conductors With this type of connection the...

Страница 68: ...n the NI PGIA rejects both the common mode noise in the signal and the ground potential difference between the signal source and the device ground shown as Vcm in the figure AI and AI must both remain...

Страница 69: ...SENSE is internally connected to the negative input of the NI PGIA Therefore the ground point of the signal connects to the negative input of the NI PGIA Any potential difference between the device gr...

Страница 70: ...ct AI signals to the device With this type of wire the signals attached to the positive and negative input channels are twisted together and then covered with a shield You then connect this shield onl...

Страница 71: ...ock controls the Convert Period which is determined by the following equation 1 Convert Period Convert Rate PFI RTSI PXI_STAR Analog Comparison Event 20 MHz Timebase 100 kHz Timebase PXI_CLK10 Program...

Страница 72: ...l pretriggered DAQ sequence AI Start Trigger ai StartTrigger can be either a hardware or software signal If AI Start Trigger is set up to be a software start trigger an output pulse appears on the ai...

Страница 73: ...f Chapter 8 PFI for more information Aggregate versus Single Channel Sample Rates MIO X Series devices are characterized with maximum single channel and maximum aggregate sample rates The maximum sing...

Страница 74: ...ple Clock AO Sample Clock ao SampleClock DI Sample Clock di SampleClock DO Sample Clock do SampleClock A programmable internal counter divides down the sample clock timebase Several other internal sig...

Страница 75: ...ing the AI Pause Trigger signal A counter timing engine on your device internally generates AI Sample Clock unless you select some external source AI Start Trigger starts this counter and either softw...

Страница 76: ...0 RTSI 0 7 PFI 0 15 PXI_STAR PXIe DSTAR A B Analog Comparison Event an analog trigger AI Sample Clock Timebase is not available as an output on the I O connector AI Sample Clock Timebase is divided do...

Страница 77: ...hout the sample To explicitly specify the conversion rate use AI Convert Clock Rate DAQmx Timing property node or function Caution Setting the conversion rate higher than the maximum rate specified fo...

Страница 78: ...red as inputs by default Using a Delay from Sample Clock to Convert Clock When using the AI timing engine to generate your Convert Clock you also can specify a configurable delay from AI Sample Clock...

Страница 79: ...wever after the device recognizes an AI Sample Clock pulse it causes an error if it receives an AI Sample Clock pulse before the correct number of AI Convert Clock pulses are received Figures 4 18 4 1...

Страница 80: ...n the I O connector AI Hold Complete Event Signal The AI Hold Complete Event ai HoldCompleteEvent signal generates a pulse after each A D conversion begins You can route AI Hold Complete Event out to...

Страница 81: ...er can also be configured to be retriggerable The timing engine will generate the sample and convert clocks for the configured acquisition in response to each pulse on an AI Start Trigger signal The t...

Страница 82: ...he rising edge or falling edge of AI Start Trigger Using an Analog Source When you use an analog trigger source the acquisition begins on the first rising edge of the Analog Comparison Event signal Ro...

Страница 83: ...ion occurs before the DAQ device captures the specified number of pretrigger samples the DAQ device ignores the condition If the buffer becomes full the DAQ device continuously discards the oldest sam...

Страница 84: ...ng an Analog Source When you use an analog trigger source the acquisition stops on the first rising edge of the Analog Comparison Event signal Routing AI Reference Trigger Signal to an Output Terminal...

Страница 85: ...Trigger ao PauseTrigger DO Pause Trigger do PauseTrigger DI Pause Trigger di PauseTrigger The source also can be one of several other internal signals on your DAQ device Refer to Device Routing in MAX...

Страница 86: ...plications through DMA or programmed I O data transfer mechanisms Some of the applications also use start reference and pause triggers Note For more information about programming analog input applicat...

Страница 87: ...ies device through the I O connector Refer to Appendix A Device Specific Information for device I O connector pinouts Instrumentation Amplifier NI PGIA The NI programmable gain instrumentation amplifi...

Страница 88: ...imum input voltage ratings can be found in the specifications document for each Simultaneous MIO X Series device Analog Input Range Input range refers to the set of input voltages that an analog input...

Страница 89: ...e voltage Vcm which is equivalent to subtracting AI 0 x GND from AI 0 x must be less than 10 V This Vcm is a constant for all range selections The signal voltage Vs which is equivalent to subtracting...

Страница 90: ...re triggering Hardware timed operations can be buffered or hardware timed single point HWTSP A buffer is a temporary storage in computer memory for to be transferred samples Buffered In a buffered acq...

Страница 91: ...the FIFO before it can be transferred to host memory The device generates an error in this case With continuous operations if the user program does not read data out of the PC buffer fast enough to k...

Страница 92: ...ns document for your device Connecting Analog Input Signals Table 4 6 summarizes the recommended input configuration for different types of signal sources for Simultaneous MIO X Series devices Refer t...

Страница 93: ...cted in some way to the building system ground and is therefore already connected to a common ground point with respect to the device assuming that the computer is plugged into the same power system a...

Страница 94: ...Mode Signal Rejection Considerations The instrumentation amplifier can reject any voltage caused by ground potential differences between the signal source and the device In addition the instrumentati...

Страница 95: ...eturn path for the bias current A value of 10 k to 100 k is usually sufficient If you do not use the resistors and the source is truly floating the source is not likely to remain within the common mod...

Страница 96: ...ion of electrostatically coupled noise This configuration does not load down the source other than the very high input impedance of the instrumentation amplifier You can fully balance the signal path...

Страница 97: ...s possible Separate the signal lines of the Simultaneous MIO X Series device from high current or high voltage lines These lines can induce currents in or voltages on the signal lines of the Simultane...

Страница 98: ...is received A typical posttrigger DAQ sequence is shown in Figure 4 28 The sample counter is loaded with the specified number of posttrigger samples in this example five The value decrements with eac...

Страница 99: ...feature the following analog input timing signals AI Sample Clock Signal AI Sample Clock Timebase Signal AI Hold Complete Event Signal AI Start Trigger Signal AI Reference Trigger Signal AI Pause Tri...

Страница 100: ...ernal or external source for AI Sample Clock You also can specify whether the measurement sample begins on the rising edge or falling edge of AI Sample Clock Using an Internal Source One of the follow...

Страница 101: ...pulse is always active high All PFI terminals are configured as inputs by default Other Timing Requirements Your DAQ device only acquires data during an acquisition The device ignores AI Sample Clock...

Страница 102: ...0 RTSI 0 7 PFI 0 15 PXI_STAR PXIe DSTAR A B Analog Comparison Event an analog trigger AI Sample Clock Timebase is not available as an output on the I O connector AI Sample Clock Timebase is divided do...

Страница 103: ...p When a certain number of points are sampled in finite mode After a hardware reference trigger in finite mode With a software command in continuous mode An acquisition that uses a start trigger but n...

Страница 104: ...channel is only visible when reading in RAW mode For maximum efficiency in bus bandwidth and onboard FIFO use use an even number of samples per channel or an even number of channels for finite acquis...

Страница 105: ...red is the buffer size minus the number of pretrigger samples Note NI USB 6356 6366 Devices You can select the buffer on the host or on the NI USB 6356 6366 device To enable a Reference Trigger to Onb...

Страница 106: ...ernal Output DI Reference Trigger di ReferenceTrigger AO Start Trigger ao StartTrigger DO Start Trigger do StartTrigger The source also can be one of several internal signals on your DAQ device Refer...

Страница 107: ...can program the active level of the pause trigger to be high or low as shown in Figure 4 33 In the figure T represents the period and A represents the unknown time between the clock pulse and the pos...

Страница 108: ...ting Started with AI Applications in Software You can use the Simultaneous MIO X Series device in the following analog input applications Simultaneous sampling Single point analog input Finite analog...

Страница 109: ...ent Studio Visual Basic and ANSI C examples refer to the KnowledgeBase document Where Can I Find NI DAQmx Examples by going to ni com info and entering the Info Code daqmxexp For additional examples r...

Страница 110: ...s Figure 5 1 X Series Analog Output Circuitry The main blocks featured in the X Series analog output circuitry are as follows DACs Digital to analog converters DACs convert digital codes to analog vol...

Страница 111: ...ot described below refer to the specifications for your device NI 6321 6323 634x Devices On NI 6321 6323 634x devices the AO reference is always 10 V So for NI 6321 6323 634x devices the analog output...

Страница 112: ...DAC conversion In NI DAQmx software timed generations are referred to as on demand timing Software timed generations are also referred to as immediate or static operations They are typically used for...

Страница 113: ...e can be either finite or continuous Finite sample mode generation refers to the generation of a specific predetermined number of data samples Once the specified number of samples has been written out...

Страница 114: ...ws and causes an error Analog Output Triggering Analog output supports two different triggering actions Start trigger Pause trigger An analog or digital trigger can initiate these actions All X Series...

Страница 115: ...nal Load Load V OUT V OUT AO GND AO 3 Analog Output Channels AO 2 Channel 3 Connector 1 AI 16 31 Channel 2 X Series Device Load Load V OUT V OUT AO GND AO 1 Analog Output Channels X Series Device AO 0...

Страница 116: ...onfigured generation in response to each pulse on an AO Start Trigger signal The timing engine ignores the AO Start Trigger signal while the clock generation is in progress After the clock generation...

Страница 117: ...signal Refer to the Triggering with an Analog Source section of Chapter 11 Triggering for more information Routing AO Start Trigger Signal to an Output Terminal You can route AO Start Trigger out to...

Страница 118: ...oon as the pause trigger is deasserted and another edge of the sample clock is received as shown in Figure 5 6 Figure 5 6 AO PauseTrigger with Other Signal Source Using a Digital Source To use AO Paus...

Страница 119: ...ause Trigger Signal to an Output Terminal You can route AO Pause Trigger out to any PFI 0 15 RTSI 0 7 or PXIe DSTARC terminal AO Sample Clock Signal Use the AO Sample Clock ao SampleClock signal to in...

Страница 120: ...ger Routing AO Sample Clock Signal to an Output Terminal You can route AO Sample Clock as an active low signal out to any PFI 0 15 RTSI 0 7 or PXIe DSTARC terminal Other Timing Requirements The AO tim...

Страница 121: ...e 100 kHz Timebase PXI_CLK10 PFI 0 15 RTSI 0 7 PXI_STAR PXIe DSTAR A B Analog Comparison Event an analog trigger AO Sample Clock Timebase is not available as an output on the I O connector You might u...

Страница 122: ...triggers in software refer to the NI DAQmx Help or the LabVIEW Help X Series devices use the NI DAQmx driver NI DAQmx includes a collection of programming examples to help you get started developing a...

Страница 123: ...rt 0 Up to 32 lines of DIO Direction and function of each terminal individually controllable Static digital input and output High speed digital waveform generation High speed digital waveform acquisit...

Страница 124: ...With a software timed acquisition software controls the rate of the acquisition Software sends a separate command to the hardware to initiate each acquisition In NI DAQmx software timed acquisitions a...

Страница 125: ...s onboard FIFO memory to a PC buffer using DMA before it is transferred to application memory Buffered acquisitions typically allow for much faster transfer rates than non buffered acquisitions becaus...

Страница 126: ...ation between the software layer and the hardware layer Refer to the NI Developer Zone document NI DAQmx Hardware Timed Single Point Lateness Checking for more information To access this document go t...

Страница 127: ...DIO line to be an output a static input or a digital waveform acquisition input X Series devices feature the following digital input timing signals DI Sample Clock Signal DI Sample Clock Timebase Sign...

Страница 128: ...arity of the signal The source can be any of the following signals DI Sample Clock di SampleClock DO Sample Clock do SampleClock AI Sample Clock ai SampleClock AI Convert Clock ai ConvertClock AO Samp...

Страница 129: ...DI Sample Clock unless you select some external source DI Start Trigger starts this timing engine and either software or hardware can stop it once a finite acquisition completes When using the DI timi...

Страница 130: ...tart Trigger Signal Use the DI Start Trigger di StartTrigger signal to begin a measurement acquisition A measurement acquisition consists of one or more samples If you do not use triggers begin a meas...

Страница 131: ...source specify a source and an edge The source can be any of the following signals PFI 0 15 RTSI 0 7 Counter n Internal Output PXI_STAR PXIe DSTAR A B Change Detection Event AI Start Trigger ai Start...

Страница 132: ...fy a buffer of finite size and a number of pretrigger samples samples that occur before the reference trigger The number of posttrigger samples samples that occur after the reference trigger desired i...

Страница 133: ...15 RTSI 0 7 PXI_STAR PXIe DSTAR A B Change Detection Event Counter n Internal Output AI Reference Trigger ai ReferenceTrigger AO Start Trigger ao StartTrigger DO Start Trigger do StartTrigger The sou...

Страница 134: ...to pause and resume a measurement acquisition The internal sample clock pauses while the external trigger signal is active and resumes when the signal is inactive You can program the active level of...

Страница 135: ...signals on your DAQ device Refer to Device Routing in MAX in the NI DAQmx Help or the LabVIEW Help for more information Using an Analog Source When you use an analog trigger source the internal sample...

Страница 136: ...The time between samples can be much shorter The timing between samples can be deterministic Hardware timed acquisitions can use hardware triggering Hardware timed operations can be buffered or hardw...

Страница 137: ...are regeneration FIFO regeneration and non regeneration modes Regeneration is the repetition of the data that is already in the buffer Standard regeneration is when data from the PC buffer is continu...

Страница 138: ...ory to the DO waveform generation FIFO The DAQ device moves samples from the FIFO to the DIO terminals on each rising or falling edge of a clock signal DO Sample Clock You can configure each DIO signa...

Страница 139: ...of the following internal signals can drive DO Sample Clock DI Sample Clock di SampleClock DO Sample Clock do SampleClock AI Sample Clock ai SampleClock AI Convert Clock ai ConvertClock AO Sample Cloc...

Страница 140: ...delay from DO Start Trigger to the first DO Sample Clock pulse By default this delay is two ticks of DO Sample Clock Timebase Figure 6 7 shows the relationship of DO Sample Clock to DO Start Trigger F...

Страница 141: ...r signal to initiate a waveform generation If you do not use triggers you can begin a generation with a software command Retriggerable DO The DO Start Trigger can also be configured to be retriggerabl...

Страница 142: ...Routing in MAX in the NI DAQmx Help or the LabVIEW Help for more information You also can specify whether the waveform generation begins on the rising edge or falling edge of DO Start Trigger Using a...

Страница 143: ...igger is asserted If the source of your sample clock is the onboard clock the generation resumes as soon as the pause trigger is deasserted as shown in Figure 6 9 Figure 6 9 DO Pause Trigger with the...

Страница 144: ...e Routing in MAX in the NI DAQmx Help or the LabVIEW Help for more information You also can specify whether the samples are paused when DO Pause Trigger is at a logic high or low level Using an Analog...

Страница 145: ...sensitive device Always properly ground yourself and the equipment when handling the DAQ device or connecting to it Programmable Power Up States At system startup and reset the hardware sets all PFI...

Страница 146: ...e The DAQ devices synchronize each DI signal to the 100 MHz Timebase and then sends the signal to the change detectors The circuitry ORs the output of all enabled change detectors from every DI signal...

Страница 147: ...ignal to a counter you also can capture the relative time between bus changes You also can use the Change Detection Event signal to trigger DO or counter generations Digital Filtering You can enable a...

Страница 148: ...in the bus will hold state until the bus becomes stable However each individual line will only wait one extra filter tick before changing This prevents a noisy line from holding a valid transition in...

Страница 149: ...ock edge as shown in Figure 6 13 Figure 6 13 Case 1 Case 2 If an additional line on the bus also has a transition during the filter clock period the change is not propagated until the next filter cloc...

Страница 150: ...n the device is reset or the computer is restarted The expiration signal that indicates an expired watchdog will continue to assert until the watchdog is disarmed After the watchdog timer expires the...

Страница 151: ...al input and P1 4 7 configured for digital output Digital input applications include receiving TTL signals and sensing external device states such as the state of the switch shown in the figure Digita...

Страница 152: ...s devices use the NI DAQmx driver NI DAQmx includes a collection of programming examples to help you get started developing an application You can modify example code and save it in an application You...

Страница 153: ...r information about connecting counter signals refer to the Default Counter Timer Pinouts section Each counter has a FIFO that can be used for buffered acquisition and generation Each counter also con...

Страница 154: ...ck DI Start Trigger DO Sample Clock CTR n Internal Output Freq Out PFI 0 15 PXI_Trig 0 7 PXIe DSTAR A B Change Detection Event Analog Comparison Event Not all timed counter operations require a sample...

Страница 155: ...n configure the counter to count rising or falling edges on its Source input You also can control the direction of counting up or down as described in the Controlling the Direction of Counting section...

Страница 156: ...2 Single Point On Demand Edge Counting You also can use a pause trigger to pause or gate the counter When the pause trigger is active the counter ignores edges on its Source input When the pause trigg...

Страница 157: ...or falling edge of the sample clock Figure 7 4 shows an example of buffered edge counting Notice that counting begins when the counter is armed which occurs before the first active edge on Sample Clo...

Страница 158: ...counter is armed while a pulse train is in progress If a counter is armed while the pulse is in the active state it will wait for the next transition to the active state to begin the measurement Refe...

Страница 159: ...ulses The counter counts the number of edges on the Source input while the Gate input remains active On each trailing edge of the Gate signal the counter stores the count in the counter FIFO A DMA con...

Страница 160: ...re 7 7 shows an example of a sample clocked buffered pulse width measurement Figure 7 7 Sample Clocked Buffered Pulse Width Measurement Hardware Timed Single Point Pulse Width Measurement A hardware t...

Страница 161: ...o edges of the Gate signal You can calculate the high and low time of the Gate input by multiplying the period of the Source signal by the number of edges returned by the counter Refer to the followin...

Страница 162: ...shows an example of an implicit buffered pulse measurement Figure 7 9 Implicit Buffered Pulse Measurement Sample Clocked Buffered Pulse Measurement A sample clocked buffered pulse measurement is simi...

Страница 163: ...hardware pulse measurement and semi period are the same measurement Both measure the high and low times of a pulse The functional difference between the two measurements is how the data is returned I...

Страница 164: ...ing sections for more information about X Series semi period measurement options Single Semi Period Measurement Implicit Buffered Semi Period Measurement Refer to the Pulse versus Semi Period Measurem...

Страница 165: ...ers Large Range of Frequencies with Two Counters Sample Clocked Buffered Frequency Measurement Hardware Timed Single Point Frequency Measurement Low Frequency with One Counter For low frequency measur...

Страница 166: ...paired with Counter 3 In this method you route a pulse of known duration T to the Gate of a counter You can generate the pulse using a second counter You also can generate the pulse externally and con...

Страница 167: ...l to measure You then measure the long pulse with a known timebase The X Series device can measure this long pulse more accurately than the faster input signal Note Counter 0 is always paired with Cou...

Страница 168: ...ment Sample clocked buffered point frequency measurements can either be a single frequency measurement or an average between sample clocks Use CI Freq EnableAveraging to set the behavior For buffered...

Страница 169: ...returns the frequency of the pulse just before the sample clock This single measurement is a single frequency measurement and is not an average between clocks Figure 7 16 Sample Clocked Buffered Freq...

Страница 170: ...ons Choosing a Method for Measuring Frequency The best method to measure frequency depends on several factors including the expected frequency of the signal to measure the desired accuracy how many co...

Страница 171: ...r the source frequency fk but the divide down means that the measurement time is the period of the divided down signal or N fx where N is the divide down Sample clocked For sample clocked frequency me...

Страница 172: ...two counter large range measurements For another example Table 7 4 shows the results for 5 MHz Table 7 3 50 kHz Frequency Measurement Methods Variable Sample Clocked One Counter Two Counter High Frequ...

Страница 173: ...frequency increases High frequency measurements with two counters is accurate for high frequency signals However the accuracy decreases as the frequency of the signal to measure decreases At very low...

Страница 174: ...ts Gate input signal after the counter is armed You can configure the counter to measure the period between two rising edges or two falling edges of the Gate input signal You can route an internal or...

Страница 175: ...X Series position measurement options Measurements Using Quadrature Encoders Measurements Using Two Pulse Encoders Buffered Sample Clock Position Measurement Measurements Using Quadrature Encoders The...

Страница 176: ...ecified phase of the quadrature cycle You can program this reload to occur in any one of the four phases in a quadrature cycle Channel Z behavior when it goes high and how long it stays high differs w...

Страница 177: ...ach rising edge of channel B as shown in Figure 7 22 Figure 7 22 Measurements Using Two Pulse Encoders For information about connecting counter signals refer to the Default Counter Timer Pinouts secti...

Страница 178: ...ingle point HWTSP operations For information about connecting counter signals refer to the Default Counter Timer Pinouts section Two Signal Edge Separation Measurement Two signal edge separation measu...

Страница 179: ...eparation Measurement Implicit Buffered Two Signal Edge Separation Measurement Sample Clocked Buffered Two Signal Separation Measurement Hardware Timed Single Point Two Signal Separation Measurement S...

Страница 180: ...Figure 7 25 Implicit Buffered Two Signal Edge Separation Measurement Sample Clocked Buffered Two Signal Separation Measurement A sample clocked buffered two signal separation measurement is similar t...

Страница 181: ...tion measurement Refer to the Sample Clocked Buffered Two Signal Separation Measurement section for more information Note If an active edge on the Gate and an active edge on the AUX does not occur bet...

Страница 182: ...t a single pulse The pulse appears on the Counter n Internal Output signal of the counter You can specify a delay from when the counter is armed to the beginning of the pulse The delay is measured in...

Страница 183: ...ses once the counter ignores the Gate input Figure 7 28 shows a generation of a pulse with a pulse delay of four and a pulse width of three using the rising edge of Source Figure 7 28 Single Pulse Gen...

Страница 184: ...Initial Delay Four Pulses In Legacy Mode this counter operation requires two counters and does not use the embedded counter For example to generate four pulses on Counter 0 Counter 0 generates the pu...

Страница 185: ...leInitalDelayOnRetrigger property The default for a single pulse is True while the default for finite pulse trains is False The counter ignores the Gate input while a pulse generation is in progress A...

Страница 186: ...to the beginning of the pulse train The delay is measured in terms of a number of active edges of the Source input You specify the high and low pulse widths of the output signal The pulse widths are...

Страница 187: ...active time of your generation on each sample clock edge Idle time and active time can also be defined in terms of frequency and duty cycle or idle ticks and active ticks Note On buffered implicit pul...

Страница 188: ...Finite Buffered Sample Clocked Pulse Train Generation This function generates a predetermined number of pulse train updates Each point you write defines pulse specifications that are updated with each...

Страница 189: ...n out New data can be written to the PC buffer at any time without disrupting the output With FIFO regeneration the entire buffer is downloaded to the FIFO and regenerated from there Once the data is...

Страница 190: ...he next sample specifications Frequency Generation You can generate a frequency by using a counter in pulse train generation mode or by using the frequency generator circuit as described in the Using...

Страница 191: ...terminals are set to high impedance at startup The FREQ OUT signal also can be routed to many internal timing signals In software program the frequency generator as you would program one of the count...

Страница 192: ...hermore suppose you specify the delay increment to be 10 On the first trigger your pulse delay will be 100 on the second it will be 110 on the third it will be 120 the process will repeat in this mann...

Страница 193: ...n this section n refers to the X Series Counter 0 1 2 or 3 For example Counter n Source refers to four signals Counter 0 Source the source input to Counter 0 Counter 1 Source the source input to Count...

Страница 194: ...Some of these options may not be available in some driver software Routing Counter n Source to an Output Terminal You can route Counter n Source out to any PFI 0 15 RTSI 0 7 or PXIe DSTARC terminal Al...

Страница 195: ...e Clock ao SampleClock DI Sample Clock di SampleClock DI Reference Trigger di ReferenceTrigger DO Sample Clock do SampleClock PXI_STAR PXIe DSTAR A B Change Detection Event Analog Comparison Event In...

Страница 196: ...e in some driver software Counter n A Counter n B and Counter n Z Signals Counter n B can control the direction of counting in edge counting applications Use the A B and Z inputs to each counter when...

Страница 197: ...e routes the Arm Start Trigger to the Counter n HW Arm input of the counter Routing Signals to Counter n HW Arm Input Any of the following signals can be routed to the Counter n HW Arm input RTSI 0 7...

Страница 198: ...utput Several other internal signals can be routed to Counter n Sample Clock through internal routes Refer to Device Routing in MAX in the NI DAQmx Help or the LabVIEW Help for more information Using...

Страница 199: ...Internal Output to any PFI 0 15 RTSI 0 7 or PXIe DSTARC terminal All PFIs are set to high impedance at startup Frequency Output Signal The Frequency Output FREQ OUT signal is the output of the frequen...

Страница 200: ...PFI 9 CTR 0 B 45 PFI 10 CTR 1 SRC 42 PFI 3 CTR 1 GATE 41 PFI 4 CTR 1 AUX 46 PFI 11 CTR 1 OUT 40 PFI 13 CTR 1 A 42 PFI 3 CTR 1 Z 41 PFI 4 CTR 1 B 46 PFI 11 CTR 2 SRC 11 PFI 0 CTR 2 GATE 10 PFI 1 CTR 2...

Страница 201: ...B 85 PFI 10 CTR 1 SRC 76 PFI 3 CTR 1 GATE 77 PFI 4 CTR 1 AUX 87 PFI 11 CTR 1 OUT 91 PFI 13 CTR 1 A 76 PFI 3 CTR 1 Z 77 PFI 4 CTR 1 B 87 PFI 11 CTR 2 SRC 73 PFI 0 CTR 2 GATE 74 PFI 1 CTR 2 AUX 75 PFI 2...

Страница 202: ...m start trigger the arm start trigger source is routed to the Counter n HW Arm signal Start Trigger For counter output operations a start trigger can be configured to begin a finite or continuous puls...

Страница 203: ...small simple counter that counts to eight or two and rolls over This counter can run faster than the larger counters which simply count the rollovers of this smaller counter Thus the prescaler acts a...

Страница 204: ...MHz Source Mode In 100 MHz source mode the device synchronizes signals on the rising edge of the source and counts on the third rising edge of the source Edges are pipelined so no counts are lost as s...

Страница 205: ...gnal by delaying the Source signal by several nanoseconds The device synchronizes signals on the rising edge of the delayed Source signal and counts on the following rising edge of the source as shown...

Страница 206: ...for AI AO DI DO or counter timer functions A timing output signal from AI AO DI DO or counter timer functions Each PFI input also has a programmable debouncing filter Figure 8 1 shows the circuitry of...

Страница 207: ...32x 634x 6351 6353 6361 6363 Devices AI Convert Clock ai ConvertClock AI Sample Clock ai SampleClock AI Start Trigger ai StartTrigger AI Reference Trigger ai ReferenceTrigger AI Pause Trigger ai Pause...

Страница 208: ...gger ao StartTrigger AO Pause Trigger ao PauseTrigger DI Sample Clock di SampleClock DI Start Trigger di StartTrigger DI Reference Trigger di ReferenceTrigger DI Pause Trigger di PauseTrigger DO Sampl...

Страница 209: ...gital changes The values on the PFI lines cannot be read in a hardware timed task but they can be used to fire the change detection event For example if you wanted to do change detection on eight time...

Страница 210: ...example of low to high transitions of the input signal High to low transitions work similarly Assume that an input terminal has been low for a long time The input terminal then changes from low to hig...

Страница 211: ...does not use the filtered version of the input signal Table 8 1 Filters Filter Setting Filter Clock N Filter Clocks Needed to Pass Signal Pulse Width Guaranteed to Pass Filter Pulse Width Guaranteed t...

Страница 212: ...sitive device Always properly ground yourself and the equipment when handling the DAQ device or connecting to it Programmable Power Up States At system startup and reset the hardware sets all PFI and...

Страница 213: ...uisitions and generations These signals can come from the following sources Your X Series device Other devices in your system through RTSI User input through the PFI terminals User input through the P...

Страница 214: ...erate many of the AI and AO timing signals The 100 kHz Timebase also can be used as the Source input to the 32 bit general purpose counter timers The 100 kHz Timebase is generated by dividing down the...

Страница 215: ...ividing down the onboard oscillator Synchronizing Multiple Devices Refer to the following sections for information about synchronizing multiple X Series devices PXI Express Devices On PXI Express syst...

Страница 216: ...ignals All devices including the initiator device receive the 10 MHz reference clock from PFI This signal becomes the external reference clock A PLL on each device generates the internal timebases syn...

Страница 217: ...seven DAQ devices in the system USB devices do not support the RTSI bus RTSI Connector Pinout NI PCIe 632x 634x 635x 636x Devices Figure 9 2 shows the RTSI connector pinout and Table 9 1 describes the...

Страница 218: ...AO Pause Trigger ao PauseTrigger DI Start Trigger di StartTrigger DI Sample Clock di SampleClock DI Pause Trigger di PauseTrigger DI Reference Trigger di ReferenceTrigger DO Start Trigger do StartTri...

Страница 219: ...e AO Start Trigger ao StartTrigger AO Sample Clock ao SampleClock AO Sample Clock Timebase ao SampleClockTimebase AO Pause Trigger ao PauseTrigger Counter input signals for all counters Source Gate Au...

Страница 220: ...10 The PXI Express backplane is responsible for generating PXIe_SYNC100 independently to each peripheral slot in a PXI Express chassis For more information refer to the PXI Express Specification at ww...

Страница 221: ...TAR from a Star Trigger controller PXI_STAR can be used as an external source for many AI AO and counter signals An X Series device is not a Star Trigger controller An X Series device can be used in t...

Страница 222: ...tion at www pxisa org Table 9 2 PXIe DSTAR Line Descriptions Trigger Line Purpose PXIe_DSTARA Distributes high speed high quality clock signals from the system timing slot to the peripherals input PXI...

Страница 223: ...Memory Access DMA DMA is a method to transfer data between the device and computer memory without the involvement of the CPU This method makes DMA the fastest available data transfer method NI uses D...

Страница 224: ...O is typically used in software timed on demand operations Refer to the Analog Output Data Generation Methods section of Chapter 5 Analog Output for more information USB Device Data Transfer Methods...

Страница 225: ...XI_STAR Filters PXIe DSTAR A C PXIe_CLK100 and PXIe_SYNC100 sections of Chapter 9 Digital Routing and Clock Generation for more information about PXI and PXI Express clock and trigger signals PXI Expr...

Страница 226: ...of Chapter 5 Analog Output The Counter Triggering section of Chapter 7 Counters Note Not all X Series devices support analog triggering For more information about triggering compatibility refer to the...

Страница 227: ...eries devices can generate a trigger on an analog signal To find your device triggering options refer to the specifications document for your device Figure 11 2 shows the analog trigger circuit on MIO...

Страница 228: ...cted they are susceptible to crosstalk from adjacent terminals which can cause false triggering Note that the APFI 0 1 terminals also can be used for other functions such as the AO External Reference...

Страница 229: ...analog reference or pause trigger and the analog channel is the source of the trigger there can be only one channel in the channel list Analog Input Channels on Simultaneous MIO X Series Devices With...

Страница 230: ...er circuitry to detect when the analog signal is below or above a level you specify In below level analog triggering mode shown in Figure 11 4 the trigger is generated when the signal value is less th...

Страница 231: ...ection circuitry is the internal Analog Comparison Event signal as shown in Figure 11 6 Figure 11 6 Analog Edge Triggering with Hysteresis Rising Slope Example Analog Edge Trigger with Hysteresis Fall...

Страница 232: ...setting the window Top value and the window Bottom value Figure 11 8 demonstrates a trigger that asserts when the signal enters the window Figure 11 8 Analog Window Triggering Mode Entering Window Ana...

Страница 233: ...nal before driving the analog trigger circuitry If you configure the AI channel to have a small input range you can trigger on very small voltage changes in the input signal Software calibrate the ana...

Страница 234: ...e and accessory choices and other information for the following X Series devices NI 6320 NI 6321 6341 NI 6323 6343 NI 6351 6361 NI 6353 6363 NI 6356 6366 NI 6358 6368 To obtain documentation for devic...

Страница 235: ...the NI PCIe 6320 device NI 6320 Pinout Figure A 1 shows the pinout of the NI PCIe 6320 device For a detailed description of each signal refer to the I O Connector Signal Descriptions section of Chapt...

Страница 236: ...P2 3 P0 3 P0 7 P0 2 D GND P0 5 P0 0 D GND NC NC AI GND AI 7 AI 7 AI 14 AI 6 AI GND AI 5 AI 5 AI 12 AI 4 AI SENSE AI 11 AI 3 AI GND AI 2 AI 2 AI 9 AI 1 AI GND AI 0 AI 0 PFI 14 P2 6 PFI 9 P2 1 D GND PFI...

Страница 237: ...iled information about the NI 6320 device NI 6320 Accessory and Cabling Options NI offers a variety of accessories and cables to use with your DAQ device Refer to the Cables and Accessories section of...

Страница 238: ...CIe PXIe 6341 and NI USB 6341 devices NI 6321 6341 Pinouts Figure A 2 shows the pinout of the NI PCIe 6321 and NI PCIe PXIe 6341 devices For a detailed description of each signal refer to the I O Conn...

Страница 239: ...3 P0 3 P0 7 P0 2 D GND P0 5 P0 0 D GND AO GND AO GND AI GND AI 7 AI 7 AI 14 AI 6 AI GND AI 5 AI 5 AI 12 AI 4 AI SENSE AI 11 AI 3 AI GND AI 2 AI 2 AI 9 AI 1 AI GND AI 0 AI 0 PFI 14 P2 6 PFI 9 P2 1 D G...

Страница 240: ...cessory and Cabling Options NI offers a variety of accessories and cables to use with your DAQ device Refer to the Cables and Accessories section of Chapter 2 DAQ System Overview for more information...

Страница 241: ...3 AI 3 AI 10 AI 2 AI GND AI 1 AI 1 AI 8 AI 0 68 34 67 33 66 32 65 31 64 30 63 29 62 28 61 27 60 26 59 25 58 24 57 23 56 22 55 21 54 20 53 19 52 18 51 17 50 16 49 15 48 14 47 13 46 12 45 11 44 10 43 9...

Страница 242: ...ermination Device Default NI DAQmx Counter Timer Pins for a list of the default NI DAQmx counter timer pins for this device For more information about default NI DAQmx counter inputs refer to Connecti...

Страница 243: ...I GND NC AI GND AO 3 AO GND AI 16 AI 16 AI 24 AI 16 AI GND AI 17 AI 17 AI 25 AI 17 AI GND AI 18 AI 18 AI 26 AI 18 AI GND AI 19 AI 19 AI 27 AI 19 AI GND AI SENSE 2 AI GND AO 2 AO GND 33 34 35 36 37 38...

Страница 244: ...e NI DAQmx Help or the LabVIEW Help NI 6323 6343 Specifications Refer to the NI 632x Specifications for more detailed information about the NI 6323 device Refer to the NI 634x Specifications for more...

Страница 245: ...2 D GND PFI 10 P2 2 PFI 11 P2 3 P0 3 P0 7 P0 2 D GND P0 5 P0 0 D GND AO GND AO GND AI GND AI 7 AI 7 AI 14 AI 6 AI GND AI 5 AI 5 AI 12 AI 4 AI SENSE AI 11 AI 3 AI GND AI 2 AI 2 AI 9 AI 1 AI GND AI 0 AI...

Страница 246: ...DAQmx counter timer pins for this device For more information about default NI DAQmx counter inputs refer to Connecting Counter Signals in the NI DAQmx Help or the LabVIEW Help 17 18 19 20 21 22 23 24...

Страница 247: ...6 AI GND AI 5 AI 5 AI 12 AI 4 AI SENSE AI 11 AI 3 AI GND AI 2 AI 2 AI 9 AI 1 AI GND AI 0 AI 0 PFI 14 P2 6 PFI 9 P2 1 D GND PFI 5 P1 5 D GND 5 V D GND PFI 12 P2 4 PFI 6 P1 6 PFI 1 P1 1 PFI 0 P1 0 D GN...

Страница 248: ...s in the NI DAQmx Help or the LabVIEW Help NI 6351 6361 Specifications Refer to the NI 6351 6353 Specifications for more detailed information about the NI 6351 device Refer to the NI 6361 6363 Specifi...

Страница 249: ...D GND P0 6 P0 1 D GND P0 4 APFI 0 AO 1 AO 0 AI 15 AI 7 AI GND AI 6 AI 6 AI 13 AI 5 AI GND AI 4 AI 4 AI GND AI 3 AI 3 AI 10 AI 2 AI GND AI 1 AI 1 AI 8 AI 0 68 34 67 33 66 32 65 31 64 30 63 29 62 28 61...

Страница 250: ...Termination Device Default NI DAQmx Counter Timer Pins for a list of the default NI DAQmx counter timer pins for this device For more information about default NI DAQmx counter inputs refer to Connect...

Страница 251: ...31 64 30 63 29 62 28 61 27 60 26 59 25 58 24 57 23 56 22 55 21 54 20 53 19 52 18 51 17 50 16 49 15 48 14 47 13 46 12 45 11 44 10 43 9 42 8 41 7 40 6 39 5 38 4 37 3 36 2 35 1 D GND D GND P0 24 P0 23 P...

Страница 252: ...Termination Device Default NI DAQmx Counter Timer Pins for a list of the default NI DAQmx counter timer pins for this device For more information about default NI DAQmx counter inputs refer to Connect...

Страница 253: ...ND AI 23 AI 23 AI 31 AI 23 AI GND APFI 1 AI GND AO 3 AO GND AI 16 AI 16 AI 24 AI 16 AI GND AI 17 AI 17 AI 25 AI 17 AI GND AI 18 AI 18 AI 26 AI 18 AI GND AI 19 AI 19 AI 27 AI 19 AI GND AI SENSE 2 AI GN...

Страница 254: ...DAQmx Help or the LabVIEW Help NI 6353 6363 Specifications Refer to the NI 6351 6353 Specifications for more detailed information about the NI 6353 device Refer to the NI 6361 6363 Specifications for...

Страница 255: ...3 P1 3 PFI 2 P1 2 D GND PFI 10 P2 2 PFI 11 P2 3 P0 3 P0 7 P0 2 D GND P0 5 P0 0 D GND AO GND AO GND AI 7 GND AI 7 AI 6 AI 5 GND AI 5 AI 4 NC AI 3 AI 2 GND AI 2 AI 1 AI 0 GND AI 0 PFI 14 P2 6 PFI 9 P2...

Страница 256: ...Termination Device Default NI DAQmx Counter Timer Pins for a list of the default NI DAQmx counter timer pins for this device For more information about default NI DAQmx counter inputs refer to Connect...

Страница 257: ...AO GND AI 7 GND AI 7 AI 6 AI 5 GND AI 5 AI 4 NC AI 3 AI 2 GND AI 2 AI 1 AI 0 GND AI 0 PFI 14 P2 6 PFI 9 P2 1 D GND PFI 5 P1 5 D GND 5 V D GND PFI 12 P2 4 PFI 6 P1 6 PFI 1 P1 1 PFI 0 P1 0 D GND D GND 5...

Страница 258: ...nter Timer Pins for a list of the default NI DAQmx counter timer pins for this device For more information about default NI DAQmx counter inputs refer to Connecting Counter Signals in the NI DAQmx Hel...

Страница 259: ...er to the NI 6366 6368 Specifications for more detailed information about the NI 6366 device NI 6356 6366 Accessory and Cabling Options NI offers a variety of accessories and cables to use with your D...

Страница 260: ...APFI 0 AO 1 AO 0 AI 7 AI 6 GND AI 6 AI 5 AI 4 GND AI 4 AI 3 GND AI 3 AI 2 AI 1 GND AI 1 AI 0 68 34 67 33 66 32 65 31 64 30 63 29 62 28 61 27 60 26 59 25 58 24 57 23 56 22 55 21 54 20 53 19 52 18 51 17...

Страница 261: ...e NI DAQmx Help or the LabVIEW Help NI 6358 6368 Specifications Refer to the NI 6356 6358 Specifications for more detailed information about the NI 6358 device Refer to the NI 6366 6368 Specifications...

Страница 262: ...in for each high impedance source before connecting to an X Series device Otherwise you must decrease the sample rate for each channel Another common cause of channel crosstalk is due to sampling amon...

Страница 263: ...Series device to sample the AI channel s MIO X Series devices use AI Sample Clock ai SampleClock and AI Convert Clock ai ConvertClock to perform interval sampling As Figure B 1 shows AI Sample Clock c...

Страница 264: ...ges The largest glitches occur when the most significant bit of the DAC code changes You can build a lowpass deglitching filter to remove some of these glitches depending on the frequency and nature o...

Страница 265: ...ervice Program Membership This program entitles members to direct access to NI Applications Engineers via phone and email for one to one technical support as well as exclusive access to eLearning trai...

Страница 266: ...urer s declaration of conformity This system affords the user protection for electromagnetic compatibility EMC and product safety You can obtain the DoC for your product by visiting ni com certificati...

Страница 267: ...0 9 micro 10 6 m milli 10 3 k kilo 103 M mega 106 Symbols Percent Positive of or plus Negative of or minus Plus or minus Less than Greater than Less than or equal to Greater than or equal to Per Degre...

Страница 268: ...n discrete steps analog trigger A trigger that occurs at a user selected point on an incoming analog signal Triggering can be set to occur at a specific level on either an increasing or a decreasing s...

Страница 269: ...nd or controlled impedance applications buffer 1 Temporary storage for acquired or generated data 2 A memory device that stores intermediate data between two devices bus buses The group of electrical...

Страница 270: ...evant specification for systems having a balanced or differential input common mode signal 1 Any voltage present at the instrumentation amplifier inputs with respect to amplifier ground 2 The signal r...

Страница 271: ...cards and DAQPad devices which connect to a computer USB port SCXI modules are considered DAQ devices DAQ STC3 Third generation data acquisition system timing controller chip data acquisition The gen...

Страница 272: ...here the values are set and held or rarely change Dynamic digital I O refers to digital systems where the signals are continuously changing often at multi MHz clock rates digital trigger A TTL level s...

Страница 273: ...iseconds in some cases During this time data accumulates in the FIFO for future retrieval With a larger FIFO longer latencies can be tolerated In the case of analog output a FIFO permits faster update...

Страница 274: ...surrounding earth Normally a noncurrent carrying circuit intended for safety 3 A common reference point for an electrical system H hardware triggering A form of triggering where you set the start tim...

Страница 275: ...owing hardware software and the user For example hardware interfaces connect two other pieces of hardware IOH Current output high IOL Current output low K kS 1 000 samples L LabVIEW A graphical progra...

Страница 276: ...rame SCXI and PXI devices are modules monotonicity A characteristic of a DAC in which the analog output always increases as the values of the digital code input to it increase multichannel Pertaining...

Страница 277: ...ingle Ended mode All measurements are made with respect to a common NRSE measurement system reference but the voltage at this reference can vary with respect to the measurement system ground O offset...

Страница 278: ...de deviates from zero for a short period of time pulse width The time from the rising to the falling slope of a pulse at 50 amplitude PXI Express PCI Express eXtensions for Instrumentation The PXI imp...

Страница 279: ...stem or a ground Also called a grounded measurement system RTSI bus Real Time System Integration bus The National Instruments timing bus that connects DAQ devices directly by means of connectors on to...

Страница 280: ...ser oriented function such as accounting program development measurement or data acquisition In contrast operating system functions basically perform the generic housekeeping of the machine which is i...

Страница 281: ...nsducer A device that responds to a physical stimulus heat light sound pressure motion flow and so on and produces a corresponding electrical signal See also sensor trigger 1 Any event that causes or...

Страница 282: ...t low Vin Volts in Vm Measured voltage VOH Volts output high VOL Volts output low Vout Volts out Vs Signal source voltage virtual channel See channel W waveform 1 The plot of the instantaneous amplitu...

Страница 283: ...MIO X Series devices 4 45 hardware timed MIO X Series devices 4 10 Simultaneous MIO X Series devices 4 44 on demand MIO X Series devices 4 10 Simultaneous MIO X Series devices 4 44 software timed MIO...

Страница 284: ...le channels B 1 differential troubleshooting B 1 ghost voltages when sampling multiple channels B 1 MIO X Series devices 4 1 AI Convert Clock 4 31 AI Convert Clock Timebase 4 34 AI Hold Complete Event...

Страница 285: ...ation xx AO FIFO 5 1 AO Pause Trigger signal 5 8 AO reference selection 5 2 AO reference selection settings 5 2 AO Sample Clock 5 2 AO Sample Clock signal 5 10 AO Sample Clock Timebase signal 5 12 AO...

Страница 286: ...MIO X Series devices 4 48 signal rejection considerations differential ground referenced signals Simultaneous MIO X Series devices 4 48 configuring AI ground reference settings in software MIO X Seri...

Страница 287: ...nter n Aux signal 7 43 Counter n B signal 7 44 Counter n Gate signal 7 43 Counter n HW Arm signal 7 45 Counter n Internal Output signal 7 47 Counter n Sample Clock signal 7 45 Counter n Source signal...

Страница 288: ...4 DI Sample Clock signal 6 6 di SampleClock 6 6 diagnostic tools NI resources C 1 DIFF connections using with floating signal sources MIO X Series devices 4 15 using with ground referenced signal sour...

Страница 289: ...Sample Clock signal 6 17 do SampleClock 6 17 documentation conventions used in manual xvii NI resources C 1 related documentation xviii double buffered acquisition MIO X Series devices 4 10 Simultane...

Страница 290: ...or ETS 7 40 pulse train 7 31 retriggerable single pulse 7 33 simple pulse 7 30 single pulse 7 30 single pulse with start trigger 7 31 software timed 5 3 6 14 getting started 1 1 AI applications in sof...

Страница 291: ...Terminal pinout A 13 NI USB 6353 6363 pinout A 20 NI USB 6356 6366 pinout A 25 I O protection 6 23 8 7 implicit buffered pulse width measurement 7 7 semi period measurement 7 12 improving analog trigg...

Страница 292: ...2 specifications A 4 NI 6321 6341 A 5 accessory options A 7 cabling options A 7 PCI Express pinout A 5 PXI Express pinout A 5 specifications A 7 USB pinout A 7 NI 6323 6343 A 8 accessory options A 11...

Страница 293: ...Series devices 4 10 Simultaneous MIO X Series devices 4 44 order of channels for scanning MIO X Series devices 4 7 other software installing 1 1 output signal glitches B 3 minimizing 5 3 terminal rout...

Страница 294: ...ty 10 3 clock 10 3 clock and trigger signals 9 8 considerations 10 3 PXIe_CLK100 9 8 PXIe_SYNC100 9 8 PXIe DSTAR A C 9 9 PXI_CLK10 9 8 PXI_STAR filters 9 9 trigger 9 9 PXIe_CLK100 9 8 PXIe_SYNC100 9 8...

Страница 295: ...nnections analog input Simultaneous MIO X Series devices 4 46 signal descriptions 3 1 signal routing RTSI bus 9 4 signal sources floating MIO X Series devices 4 13 Simultaneous MIO X Series devices 4...

Страница 296: ...unting 7 4 pulse generation 7 30 retriggerable 7 33 with start trigger 7 31 pulse width measurement 7 6 semi period measurement 7 12 two signal edge separation measurement 7 27 single ended connection...

Страница 297: ...se 7 50 PXI 9 8 PXI_STAR 9 9 Star Trigger 9 9 start 7 50 triggering 11 1 analog accuracy 11 8 analog actions 11 4 analog edge 11 5 analog edge with hysteresis 11 6 analog input MIO X Series devices 4...

Страница 298: ...disk drive power connector PCI Express 3 4 W waveform generation digital 6 16 signals 5 6 Web resources C 1 wiring Simultaneous MIO X Series devices 4 51 working voltage range Simultaneous MIO X Seri...

Страница 299: ...uipment Have surplus equipment taking up shelf space We ll give it a new home Learn more Visit us at artisantg com for more info on price quotes drivers technical specifications manuals and documentat...

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