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Chapter 3

Analog Output

Analog Output Series User Manual

3-2

ni.com

AO Sample Clock

The DAC reads a sample from the FIFO with every cycle of the AO Sample 
Clock signal and generates the AO voltage. For more information on the 
AO Sample Clock signal, refer to the 

Waveform Generation Timing Signals

 

section.

Reference Selection

(NI 6711/6713/DAQCard-6715 and NI 6731/6733 Only)

 Reference selection 

allows you to set the AO range. Refer to Table 3-1 to set the range for your 
device.

Analog Output Resolution

You can calculate the least significant bit (LSB), or the minimal allowed 
voltage change, on a voltage output on your AO Series device as follows:

LSB = output voltage range/2

resolution of your device

where the output range is determined by your reference selection. Using 
AO EXT REF, you can reduce the output voltage range and lower the 
LSB, the minimum allowed voltage change. For more information on
using the AO External Reference signal, refer to the 

Reference Selection 

(NI 6711/6713/DAQCard-6715 and NI 6731/6733 Only)

 section.

The following equation is an example of this formula using the 
NI 6731/6733.

The denominator in the equation is derived from 2

16

= 65,536, since the 

NI 6731/6733 devices use 16-bit DACs.

Table 3-1.  

AO Reference Selection Options

AO Range

Polarity

Reference Select

±10 V

Bipolar

Internal

±EXT REF

Bipolar

AO External Reference Signal

20 V

65,536

----------------

305 

μ

V

=

Содержание DAQCard-6715

Страница 1: ...DAQ Analog Output Series Analog Output Series User Manual NI 6711 6713 DAQCard 6715 NI 6722 6723 and NI 6731 6733 Devices Analog Output Series User Manual June 2007 370735E 01 ...

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Страница 3: ... photocopying recording storing in an information retrieval system or translating in whole or in part without the prior written consent of National Instruments Corporation National Instruments respects the intellectual property of others and we ask our users to do the same NI software is protected by copyright and other intellectual property laws Where NI software may be used to reproduce software...

Страница 4: ...nt of Communications DOC Changes or modifications not expressly approved by NI could void the user s authority to operate the equipment under the FCC Rules Class A Federal Communications Commission This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against ha...

Страница 5: ... 6 Field Wiring Considerations 1 6 Programming Devices in Software 1 7 Chapter 2 I O Connector 68 Pin AO I O Connector Pinouts 2 1 68 68 Pin Extended AO I O Connector Pinout 2 5 Terminal Name Equivalents 2 7 I O Connector Signal Descriptions 2 9 5 V Power Source 2 12 Chapter 3 Analog Output Analog Output Fundamentals 3 1 Analog Output Circuitry 3 1 DACs 3 1 DAC FIFO 3 1 AO Sample Clock 3 2 Referen...

Страница 6: ...ng an Internal Source 3 9 Using an External Source 3 9 Outputting the AO Sample Clock Signal 3 9 Other Timing Requirements 3 10 AO Sample Clock Timebase Signal 3 11 Master Timebase Signal 3 11 Getting Started with AO Applications in Software 3 12 Chapter 4 Digital I O Static DIO 4 2 Digital Waveform Generation NI 6731 6733 Only 4 2 DO Sample Clock Signal NI 6731 6733 Only 4 2 Using an Internal Sou...

Страница 7: ... 6 Counter 1 Source Signal 5 7 Counter 1 Gate Signal 5 7 Counter 1 Internal Output Signal 5 8 Counter 1 Up Down Signal 5 9 Frequency Output Signal 5 9 Master Timebase Signal 5 9 Getting Started with Counter Applications in Software 5 10 Chapter 6 Programmable Function Interfaces PFI Inputs 6 1 Outputs 6 2 Chapter 7 Digital Routing Timing Signal Routing 7 1 Connecting Timing Signals 7 3 Routing Sig...

Страница 8: ...fer Methods 9 2 Direct Memory Access DMA 9 2 Interrupt Request IRQ 9 2 Programmed I O 9 2 Changing Data Transfer Methods between DMA and IRQ 9 2 Chapter 10 Triggering Triggering with a Digital Source 10 1 Appendix A Device Specific Information Appendix B Troubleshooting Appendix C Technical Support and Professional Services Glossary Index ...

Страница 9: ...is icon denotes a caution which advises 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 Radio Frequency Interference document for information about precautions to take When symbol is marked on a product it denotes a warning advising you to take precautions to avoid electrical shock When symbol is m...

Страница 10: ...DAQmx for Windows software how to install your NI DAQmx supported DAQ device and how to confirm that your device is operating properly Select Start All Programs National Instruments NI DAQ DAQ Getting Started Guide The NI DAQ Readme lists which devices are supported by this version of NI DAQ Select Start All Programs National Instruments NI DAQ NI DAQ Readme The NI DAQmx Help contains general info...

Страница 11: ...ents NI DAQmx Base Documentation Getting Started Guide Getting Started with NI DAQmx Base for Linux and Mac Users describes how to install your NI DAQmx Base software your NI DAQmx Base supported DAQ device and how to confirm that your device is operating properly on your Mac Linux machine The NI DAQmx Base Readme lists which devices are supported by this version of NI DAQmx Base Select Start All ...

Страница 12: ...ow to take an NI DAQmx measurement in LabVIEW using the DAQ Assistant VI and Function Reference Measurement I O VIs and Functions Describes the LabVIEW NI DAQmx VIs and properties Taking Measurements Contains the conceptual and how to information you need to acquire and analyze measurement data in LabVIEW including common measurements measurement fundamentals NI DAQmx key concepts and device consi...

Страница 13: ...sual Studio NET select Measurement Studio Measurement Studio Reference To create an application in Visual C Visual C or Visual Basic NET follow these general steps 1 In Visual Studio NET select File New Project to launch the New Project dialog box 2 Find the Measurement Studio folder for the language you want to create a program in 3 Choose a project type You add DAQ tasks as a part of this step A...

Страница 14: ...Device Documentation and Specifications The NI 6711 6713 DAQCard 6715 Specifications contains all specifications for the NI 6711 NI 6713 and NI DAQCard 6715 AO Series devices The NI 6722 6723 Specifications contains all specifications for the NI 6722 and NI 6723 AO Series devices The NI 6731 6733 Specifications contains all specifications for the NI 6731 and NI 6733 AO Series devices NI DAQmx incl...

Страница 15: ...se documents at ni com manuals DAQ specifications and some DAQ manuals 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 to download Acrobat Reader Refer to the National Instruments Product Manuals Library at ni com manuals for updated documentation resou...

Страница 16: ...itioning cables that connect the various devices to the accessories the analog output device and the programming software Refer to the Using Accessories with Devices section for a list of devices and their compatible accessories Figure 1 1 DAQ System Setup 1 Sensors and Transducers 2 Terminal Block Accessory 3 Cable Assembly 4 DAQ Device 5 Personal Computer 2 4 3 5 1 V HV mV ...

Страница 17: ...of the following three timing groups AI two 24 bit two 16 bit counters not used on AO Series devices AO three 24 bit one 16 bit counter General purpose counter timer functions two 24 bit counters You can independently configure the groups for timing resolutions of 50 ns or 10 μs With the DAQ STC you can interconnect a wide variety of internal timing signals to other internal blocks The interconnec...

Страница 18: ...are stored in the EEPROM of the device as calibration constants Before performing a measurement these constants are read out of the EEPROM and are used to adjust the calibration hardware on the device NI DAQ determines when this is necessary and does it automatically If you are not using NI DAQ you must load these values yourself You can calibrate AO Series devices in the following two ways Intern...

Страница 19: ...onnector blocks with screw terminals I O connector cables RTSI bus cables Low channel count digital signal conditioning modules devices and accessories For more specific information about these products refer to ni com The following sections contain information on how to select accessories for your AO Series device Using Accessories with Devices Table 1 1 Accessories and Cables for Analog Output D...

Страница 20: ...CB 68 TB 68 NI 6731 6733 SH68 68 EP BNC 2110 CB 68LP CB 68LPR SCB 68 TB 68 Table 1 2 Overview of DAQ Accessories for Analog Output Devices Accessory Description BNC 2110 BNC connector block for 68 pin analog output devices BNC 2115 BNC connector block for extended I O CB 68LP CB 68LPR 68 pin low cost screw terminal block SCB 68 68 pin shielded screw terminal block with breadboard areas TB 68 68 pi...

Страница 21: ...or Board Mating Connectors To access this document go to ni com info and enter the info code rdsmbm Field Wiring Considerations The following recommendations apply for all signal connections to the AO Series device Separate the signal lines of the AO Series device from high current or high voltage lines These lines can induce currents in or voltages on the signal lines of the AO Series device if t...

Страница 22: ...classes attributes and properties for creating applications for your device NI DAQ 7 x includes two NI DAQ drivers Traditional NI DAQ Legacy and NI DAQmx Each driver has its own API hardware configuration and software configuration Refer to the DAQ Getting Started Guide for more information about the two drivers Traditional NI DAQ Legacy and NI DAQmx each include a collection of programming exampl...

Страница 23: ... Studio directory contains a link to the ActiveX control examples for use with Measurement Studio NI DAQ Examples VBasic directory contains the examples not associated with Measurement Studio NI DAQmx examples for ANSI C are in the NI DAQ Examples DAQmx ANSI C Dev directory Traditional NI DAQ Legacy examples for ANSI C are in the NI DAQ Examples VisualC directory For additional examples refer to z...

Страница 24: ...s I O connectors Note Some hardware accessories may not yet reflect the NI DAQmx terminal names If you are using an AO Series device in Traditional NI DAQ Legacy refer to Table 2 1 for the Traditional NI DAQ Legacy signal names 68 Pin AO I O Connector Pinouts Figure 2 1 Figure 2 2 and Figure 2 3 show the pinouts of 68 pin AO Series devices ...

Страница 25: ...GND AO 3 AO GND AO GND NC AO GND NC AO GND AO GND NC AO GND D GND PFI 8 CTR 0 SOURCE PFI 7 CTR 1 OUT PFI 4 CTR 1 GATE PFI 3 CTR 1 SOURCE PFI 2 D GND D GND D GND EXT STROBE NC P0 3 P0 7 P0 2 D GND P0 5 P0 0 D GND AO GND AO GND AO GND AO 2 AO GND AO GND NC AO GND NC AO GND AO GND NC AO GND AO GND NC 1 35 2 36 3 37 4 38 5 39 6 40 7 41 8 42 9 43 10 44 11 45 12 46 13 47 14 48 15 49 16 50 17 51 18 52 19...

Страница 26: ...1 AO 0 AO GND AO GND AO 3 AO GND AO GND AO 5 AO GND AO 6 AO GND AO GND NC AO GND D GND PFI 8 CTR 0 SOURCE PFI 7 CTR 1 OUT PFI 4 CTR 1 GATE PFI 3 CTR 1 SOURCE PFI 2 D GND D GND D GND EXT STROBE NC P0 3 P0 7 P0 2 D GND P0 5 P0 0 D GND AO GND AO GND AO GND AO 2 AO GND AO GND AO 4 AO GND NC AO GND AO GND AO 7 AO GND AO GND NC 1 35 2 36 3 37 4 38 5 39 6 40 7 41 8 42 9 43 10 44 11 45 12 46 13 47 14 48 1...

Страница 27: ...ND P0 4 CAL AO 1 AO 0 AO GND AO GND AO 3 AO GND AO GND AO 5 AO GND AO 6 AO GND AO GND NC AO GND D GND PFI 8 CTR 0 SOURCE PFI 7 CTR 1 OUT PFI 4 CTR 1 GATE PFI 3 CTR 1 SOURCE PFI 2 D GND D GND D GND EXT STROBE NC P0 3 P0 7 P0 2 D GND P0 5 P0 0 D GND AO GND AO GND AO GND AO 2 AO GND AO GND AO 4 AO GND NC AO GND AO GND AO 7 AO GND AO GND NC 1 35 2 36 3 37 4 38 5 39 6 40 7 41 8 42 9 43 10 44 11 45 12 4...

Страница 28: ...National Instruments Corporation 2 5 Analog Output Series User Manual 68 68 Pin Extended AO I O Connector Pinout The NI 6723 has two 68 pin I O connectors Figure 2 4 shows the pin assignments for both connectors on the NI 6723 ...

Страница 29: ...C AO GND AO GND AO 7 AO GND AO GND NC 1 35 2 36 3 37 4 38 5 39 6 40 7 41 8 42 9 43 10 44 11 45 12 46 13 47 14 48 15 49 16 50 17 51 18 52 19 53 20 54 21 55 22 56 23 57 24 58 25 59 26 60 27 61 28 62 29 63 30 64 31 65 32 66 33 67 34 68 NC NC NC NC NC NC NC NC NC AO 31 AO 30 AO GND AO 28 AO 27 AO GND AO 25 AO 24 AO GND AO 22 AO 21 AO GND NC AO 19 AO 18 AO GND AO 16 AO 15 AO GND AO 13 AO 12 AO GND AO 1...

Страница 30: ...tware products The revised terminal names used in this document are usually similar to the names they replace Refer to Table 2 1 for a list of Traditional NI DAQ Legacy terminal names and their NI DAQmx equivalents Table 2 1 Terminal Name Equivalents Traditional NI DAQ Legacy NI DAQmx ACH AI ACH AI ACH AI ACHGND AI GND AIGND AI GND AISENSE AI SENSE AISENSE2 AI SENSE 2 AOGND AO GND CONVERT AI CONV ...

Страница 31: ...OURCE CTR 1 SOURCE or CTR 1 SRC PA PB PC P0 P1 P2 PFI PFI PFI_ PFI SCANCLK AI HOLD COMP or AI HOLD SISOURCE AI Sample Clock Timebase STARTSCAN AI SAMP CLK or AI SAMP TRIG1 AI START TRIG or AI START TRIG2 AI REF TRIG or REF TRIG UISOURCE AO Sample Clock Timebase UPDATE AO SAMP CLK or AO SAMP WFTRIG AO START TRIG or AO START Table 2 1 Terminal Name Equivalents Continued Traditional NI DAQ Legacy NI ...

Страница 32: ... 0 7 D GND Input or Output Digital I O signals These pins drive and receive digital signals P0 6 and P0 7 can control the up down signal of Counters 0 and 1 respectively 5 V D GND Output 5 VDC source These pins provide 5 V power AO EXT REF D GND Input External Reference This pin is the external reference input for the AO circuitry AI HOLD COMP D GND Output AI Hold Complete This pin is used to cont...

Страница 33: ...hapter 5 Counters CTR 1 OUT D GND Output Counter 1 Output Signal This pin emits the Ctr1InternalOutput signal For more information refer to Chapter 5 Counters PFI 5 AO SAMP CLK D GND Input PFI 5 As an input this pin is a general purpose input terminal Output AO Sample Clock Signal As an output this pin emits the ao SampleClock signal A high to low transition of this signal indicates a new sample i...

Страница 34: ...ault input for the Ctr0Gate signal Output Counter 0 Gate Signal As an output this pin emits the Ctr0Gate signal This signal reflects the actual gate signal connected to Counter 0 For more information refer to Chapter 5 Counters CTR 0 OUT D GND Input Counter 0 Output Signal As an input this pin can be used to route signals directly to the RTSI bus For more information refer to Chapter 5 Counters Ou...

Страница 35: ...to D GND to power external circuitry A self resetting fuse protects the supply from overcurrent conditions The fuse resets automatically within a few seconds after the overcurrent condition is removed Power rating 4 65 to 5 25 VDC at 1 A 0 75 A for the DAQCard 6715 The 5 V line on the connector of the DAQCard 6715 is fused at 0 75 A However the actual current available can be limited below this va...

Страница 36: ...log Output Circuitry DACs Digital to analog converters DACs convert digital codes to analog voltages DAC FIFO The DAC FIFO enables analog output waveform generation It is a first in first out FIFO memory buffer between the computer and the DACs that allows you to download all the points of a waveform to your board without host computer interaction AO 0 AO 1 DAC0 DAC1 AO FIFO AO Data AO Sample Cloc...

Страница 37: ...ange on a voltage output on your AO Series device as follows LSB output voltage range 2resolution of your device where the output range is determined by your reference selection Using AO EXT REF you can reduce the output voltage range and lower the LSB the minimum allowed voltage change For more information on using the AO External Reference signal refer to the Reference Selection NI 6711 6713 DAQ...

Страница 38: ...transitions This uniform glitch energy appears as a multiple of the update rate in the frequency spectrum This reglitch circuit does not eliminate the glitches it only makes them more uniform in size By default reglitching is disabled for all channels however you can use NI DAQ to independently enable reglitching for each channel Minimizing Glitches on the Output Signal When you use a DAC to gener...

Страница 39: ...ween samples can be deterministic Hardware timed generations can use hardware triggering For more information refer to Chapter 10 Triggering Hardware timed operations can be buffered or non buffered A buffer is a temporary storage in computer memory for acquired or to be generated samples Buffered In a buffered generation data is moved from a PC buffer to the DAQ device s onboard FIFO using DMA or...

Страница 40: ...r must fit within the FIFO size The advantage of using FIFO regeneration is that it does not require communication with the main host memory when the operation is started thereby preventing any problems that may occur due to excessive bus traffic With non regeneration old data will not be repeated New data must be continually written to the buffer If the program does not write new data to the buff...

Страница 41: ...AO Sample Clock that causes all AO channels to update simultaneously Figure 3 3 summarizes the timing and routing options provided by the analog output timing engine Figure 3 3 Analog Output Engine Routing Options Load Load V OUT V OUT AO GND AO 1 Analog Output Channels AO Series Device AO 0 Channel 1 Channel 0 I O Connector Vref External Reference Signal Optional AO EXT REF RTSI 7 20 MHz Timebase...

Страница 42: ...l signal on your DAQ device Refer to Device Routing in MAX in the NI DAQmx Help or the LabVIEW Help in version 8 0 for more information Figure 3 4 shows the timing requirements of the ao StartTrigger digital source Figure 3 4 ao StartTrigger Timing Requirements Outputting the AO Start Trigger Signal You can configure the PFI 6 AO START TRIG pin to output the ao StartTrigger signal The output pin r...

Страница 43: ...use ao Pause Trigger specify a source and a polarity The source can be an external signal connected to any PFI or RTSI 0 6 pin The source can also be one of several other internal signals on your DAQ device Refer to Device Routing in MAX in the NI DAQmx Help or the LabVIEW Help in version 8 0 for more information Also specify whether the samples are paused when ao PauseTrigger is at a logic high o...

Страница 44: ...he NI DAQmx Help or the LabVIEW Help in version 8 0 for more information Using an External Source You can use a signal connected to any PFI or RTSI 0 6 pin as the source of ao SampleClock Figure 3 6 shows the timing requirements of the ao SampleClock source Figure 3 6 ao SampleClock Timing Requirements Outputting the AO Sample Clock Signal You can configure the PFI 5 AO SAMP CLK pin to output the ...

Страница 45: ...e The ao StartTrigger signal starts this counter It is stopped automatically by hardware after a finite acquisition completes or manually through software When using an internally generated ao SampleClock in NI DAQmx you can also specify a configurable delay from the ao StartTrigger to the first ao SampleClock pulse By default this delay is two ticks of the ao SampleClockTimebase signal Figure 3 8...

Страница 46: ...al then you should use the ao SampleClock signal rather than the ao SampleClockTimebase If you do not specify an external sample clock timebase NI DAQ uses the Onboard Clock Figure 3 9 shows the timing requirements for the ao SampleClockTimebase signal Figure 3 9 ao SampleClockTimebase Timing Requirements The maximum allowed frequency is 20 MHz with a minimum pulse width of 10 ns high or low There...

Страница 47: ... Integration Bus RTSI for more information on which signals are available through RTSI Figure 3 10 shows the timing requirements for MasterTimebase Figure 3 10 MasterTimebase Timing Requirements Getting Started with AO Applications in Software You can use the AO Series device in the following analog output applications Single Point Generation Finite Generation Continuous Generation Waveform Genera...

Страница 48: ...y High speed digital waveform acquisition NI 6731 6733 only Figure 4 1 shows the circuitry of one DIO line Figure 4 1 AO Series Digital I O Block Diagram The DIO terminals are named P0 0 7 on the I O connector The voltage input and output levels and the current drive levels of the DIO lines are listed in the specifications of your device DO Sample Clock DO Waveform Generation FIFO DO x Direction C...

Страница 49: ...ible sources The DO waveform generation FIFO stores the digital samples The NI 6731 6733 can use DMA transfers to move data from the system memory 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 SampleClock For more information on DMA transfers refer to the Direct Memory Access DMA section of Cha...

Страница 50: ...ion You must ensure that the time between two active edges of the do SampleClock is not too short If the time is too short the DO waveform generation FIFO is not able to read the next sample fast enough Digital Waveform Acquisition NI 6731 6733 Only The NI 6731 6733 can acquire digital waveforms This behavior is also referred to as correlated digital I O because there is no dedicated clock source ...

Страница 51: ...t software Using an Internal Source To use di SampleClock with an internal source specify the signal source and the polarity of the signal The source can be any of the following signals AO Sample Clock Counter 0 Out Program the DAQ device to sample the DIO terminals on the rising edge or falling edge of di SampleClock Using an External Source You can use a signal connected to any RTSI 0 6 pin as t...

Страница 52: ...NI has several signal conditioning solutions for digital applications requiring high current drive If you configure a PFI or DIO line as an input do not drive the line with voltages outside of its normal operating range The PFI or DIO lines have a smaller operating range than the AI signals Treat the DAQ device as you would treat any static sensitive device Always properly ground yourself and the ...

Страница 53: ...nd sensing external device states such as the state of the switch shown in the figure Digital output applications include sending TTL signals and driving external devices such as the LED shown in the figure Figure 4 2 Digital I O Signal Connections Caution Exceeding the maximum input voltage ratings which are listed in the specifications of each AO Series device can damage the DAQ device and the c...

Страница 54: ... Digital Output Digital Waveform Generation Digital Waveform Acquisition NI 6731 6733 only For correlated DIO examples in Traditional NI DAQ Legacy refer to the KnowledgeBase document What Devices Other Than M Series Can Perform Correlated Digital I O To access this document go to ni com info and enter the info code rdwd7m Note For more information about programming digital I O applications and tr...

Страница 55: ...ing Counters support two different triggering actions start and pause Only digital triggers can initiate these actions For more information on digital triggers refer to the Triggering with a Digital Source section of Chapter 10 Triggering Start Trigger A start trigger begins a finite or continuous pulse generation When a continuous generation is initiated the pulses continue to generate until you ...

Страница 56: ... on counter timing signals Counter Timing Summary Figure 5 2 shows the timing requirements for the gate and source input signals and the timing specifications for the output signals on your device Figure 5 2 Gate and Source Input Timing Requirements The gate and out signal transitions shown in Figure 5 2 are referenced to the rising edge of the source signal This timing diagram assumes that the co...

Страница 57: ...lts in an uncertainty of one source clock period with respect to unsynchronized gating sources The output timing parameters are referenced to the signal at the source input or to one of the internally generated clock signals on your device Figure 5 2 shows the out signal referenced to the rising edge of a source signal Any out signal state changes occur within 80 ns after the rising or falling edg...

Страница 58: ...al Counter 0 Gate Signal You can select any PFI as well as many other internal signals like the Counter 0 Gate Ctr0Gate signal The Ctr0Gate signal is configured in edge detection or level detection mode depending on the application performed by the counter The gate signal can perform many different operations including starting and stopping the counter generating interrupts and saving the counter ...

Страница 59: ...lse on TC and toggle output polarity on TC The output polarity is software selectable for both options Figure 5 5 shows the behavior of the Ctr0InternalOutput signal Figure 5 5 Ctr0InternalOutput Signal Behavior You can use Ctr0InternalOutput in the following applications In pulse generation mode the counter drives Ctr0InternalOutput with the generated pulses To enable this behavior software confi...

Страница 60: ...TR 0 OUT is set to high impedance at startup Figure 5 6 shows the relationship of CTR 0 OUT and Ctr0InternalOutput Figure 5 6 CTR 0 OUT and Ctr0InternalOutput Counter 0 Up Down Signal You can externally input this signal on the P0 6 pin but it is not available as an output on the I O connector When you enable externally controlled count direction Counter 0 counts down when this pin is at a logic l...

Страница 61: ...ming Requirements The maximum allowed frequency is 20 MHz with a minimum pulse width of 10 ns high or low There is no minimum frequency For most applications unless you select an external source the 20MHzTimebase signal or the 100kHzTimebase signal generates the Ctr1Source signal Counter 1 Gate Signal You can select any PFI as well as many other internal signals like the Counter 1 Gate Ctr1Gate si...

Страница 62: ...rity is software selectable for both options Figure 5 9 shows the behavior of the Ctr1InternalOutput signal Figure 5 9 Ctr1InternalOutput Behavior You can use Ctr1InternalOutput in the following applications In pulse generation mode the counter drives Ctr1InternalOutput with the generated pulses To enable this behavior software configures the counter to toggle Ctr1InternalOutput on TC Ctr1Internal...

Страница 63: ...nput clock by the numbers one through 16 The input clock of the frequency generator is software selectable from the internal 10 MHz and 100 kHz timebases The output polarity is software selectable This output is set to high impedance at startup Master Timebase Signal The Master Timebase MasterTimebase signal or Onboard Clock is the timebase from which all other internally generated clocks and time...

Страница 64: ...Counting Edges Frequency Measurement Period Measurement Pulse Width Measurement Semi Period Measurement Pulse Generation You can perform these measurements through programmed I O interrupt or DMA data transfer mechanisms The measurements can be finite or continuous in duration Some of the applications also use start triggers and pause triggers Note For more information about programming counter ap...

Страница 65: ...ing When using the PFI pin as an input you can individually configure each PFI for edge or level detection and for polarity selection You can use the polarity selection for any of the timing signals but the edge or level detection depends upon the particular timing signal being controlled The detection requirements for each timing signal are listed within the section that discusses that signal In ...

Страница 66: ...put PFI pins are labeled with the timing signal that can be output on it For example PFI 8 is labeled PFI 8 CTR 0 Source The following timing signals can be output on PFI pins AO Start Trigger Signal AO Sample Clock Signal Counter 0 Source Signal Counter 0 Gate Signal Counter 1 Source Signal Counter 1 Gate Signal Caution Do not drive a PFI signal externally when it is configured as an output For m...

Страница 67: ...escription of which routes are possible on your device click the Device Routes tab in Measurement Automation Explorer Timing Signal Routing The DAQ STC provides a flexible interface for connecting timing signals to other devices or external circuitry Your device uses the RTSI bus to interconnect timing signals between devices and it uses the programmable function interface PFI pins on the I O conn...

Страница 68: ... configurable For example the signal routing multiplexer for controlling the ao SampleClock signal is shown in Figure 7 1 Figure 7 1 Signal Routing Multiplexer on Analog Output Devices Figure 7 1 shows that you can generate the ao SampleClock signal from a number of sources including the external signals RTSI 0 6 PFI 0 9 and the internal signals Onboard Clock and Ctr1InternalOutput Here the Onboar...

Страница 69: ...your device can damage your device and the computer NI is not liable for any damage resulting from signal connections that exceed the maximum ratings The 10 programmable function interface PFI pins labeled PFI 0 9 route all external control over the timing of the device These lines serve as connections to virtually all internal timing signals These PFIs are bidirectional As outputs they are not pr...

Страница 70: ...or more information about routing signals in software refer to the NI DAQmx Help Table 7 1 Signal Routing in Software Language Program Function LabVIEW NI DAQmx DAQmx Export Signal vi and DAQmx Connect Terminals vi Traditional NI DAQ Legacy Route Signal vi C NI DAQmx Export_Signal and DAQmx_Connect_Terminals Traditional NI DAQ Legacy Select_Signal D GND PFI 0 PFI 2 PFI 2 Source I O Connector AO Se...

Страница 71: ...mation To access this document go to ni com info and enter the info code rdrtcp Note The NI DAQCard 6715 does not use the RTSI bus RTSI Triggers The seven RTSI trigger lines on the RTSI bus provide a flexible interconnection scheme for devices sharing the RTSI bus These bidirectional lines can drive or receive any of the timing and triggering signals shown below directly to or from the trigger bus...

Страница 72: ... PCI RTSI bus signal connection Figure 8 1 PCI RTSI Bus Signal Connection RTSI Bus Connector Switch RTSI Switch RTSI Trigger 7 Trigger 0 6 DAQ STC Ctr0 Source Ctr0Gate Ctr0InternalOutput Ctr0Out Ctr1Source Ctr1Gate 20MHzTimebase MasterTimebase ao StartTrigger ao PauseTrigger ao SampleClockTimebase ao SampleClock ...

Страница 73: ...imebase to generate the necessary timing signals for controlling DAC updates or general purpose signals at the I O connector This timebase is also called the Master Timebase or Onboard Clock For more information refer to the Master Timebase Signal section of Chapter 3 Analog Output The AO Series device can use either its internal 20MHzTimebase signal or a timebase received over the RTSI bus The ti...

Страница 74: ...ple Devices With the RTSI bus and the routing capabilities of the DAQ STC there are several ways to synchronize multiple devices depending on your application NI recommends that you use a common timebase as the MasterTimebase signal and share any common triggers in the application One device is designated as the master device and all other devices are designated as slave devices The 20MHzTimebase ...

Страница 75: ...andard CompactPCI chassis you cannot use PXI specific functions but you can still use the basic plug in device functions For example the RTSI bus on a PXI AO Series device is available in a PXI chassis but not in a CompactPCI chassis The CompactPCI specification permits vendors to develop sub buses that coexist with the basic PCI interface on the CompactPCI bus Compatible operation is not guarante...

Страница 76: ...data transfer speed is tightly coupled to the rate at which the CPU can service the interrupt requests If you are using interrupts to acquire data at a rate faster than the rate the CPU can service the interrupts your systems may start to freeze Programmed I O Programmed I O is a data transfer mechanism where the user s program is responsible for transferring data Each read or write call in the pr...

Страница 77: ...formation refer to the Analog Output Triggering section of Chapter 3 Analog Output and the Counter Triggering section of Chapter 5 Counters Triggering with a Digital Source Your DAQ device can generate a trigger on a digital signal You must specify a source and an edge The digital source can be any of the PFI or RTSI 0 6 signals The edge can be either the rising edge or falling edge of the digital...

Страница 78: ... DAQ device to perform an action in response to a trigger from a digital source The action can affect analog output generation counter behavior For more information refer to the Analog Output Triggering section of Chapter 3 Analog Output and the Counter Triggering section of Chapter 5 Counters ...

Страница 79: ... analog output AO digital I O DIO and timing I O TIO devices for PCI bus computers The NI 6711 features four AO channels with 12 bit resolution eight lines of TTL compatible DIO two 24 bit counter timers for TIO a 68 pin AO I O connector The NI 6713 features eight AO channels with 12 bit resolution eight lines of TTL compatible DIO two 24 bit counter timers for TIO a 68 pin AO I O connector Becaus...

Страница 80: ...connector and the NI 6713 has eight channels of voltage output at the I O connector The reference for the AO circuitry is software selectable per channel The reference can be either internal or external but the range is always bipolar This means that you can generate signals up to 10 V with internal reference selected or EXT REF voltage with external reference selected ...

Страница 81: ...nput Timing Control Digital I O Trigger Counter Timing I O RTSI Bus Interface DMA IRQ Bus Interface Address Data Address Control EEPROM Control AO Control Calibration Control DMA IRQ Register Decode FPGA DAQ STC Bus Interface PCI MITE Generic Bus Interface PCI Bus Interface IRQ DMA AO 5 Latch 12 AO 5 12 Bit DAC AO 6 Latch 12 AO 6 12 Bit DAC AO 7 Latch 12 AO 7 12 Bit DAC DAC FIFO AO 5 Amp AO 6 Amp ...

Страница 82: ...er timers for TIO a 68 pin AO I O connector Because the NI DAQCard 6715 have no DIP switches jumpers or potentiometers they are easily software configured and calibrated For the NI DAQCard 6715 connector pinouts refer to Chapter 2 I O Connector Analog Output NI DAQCard 6715 The NI DAQCard 6715 has eight channels of voltage output at the I O connector The reference for the AO circuitry is software ...

Страница 83: ...4 12 Bit DAC AO 4 Amp AO 5 12 Bit DAC AO 6 12 Bit DAC AO 7 12 Bit DAC AO 5 Amp AO 6 Amp AO 7 Amp Data AO 0 12 Bit DAC AO 0 Amp AO 1 12 Bit DAC AO 2 12 Bit DAC AO 3 12 Bit DAC AO 1 Amp AO 2 Amp AO 3 Amp 0 75 A 5 V Digital Thermometer CIS EEPROM Address Control Data Control DAQ STC Analog Output Timing Control Analog Input Timing Control Digital I O Trigger Counter Timing I O RTSI Bus Interface IRQ ...

Страница 84: ...els with 13 bit resolution eight lines of TTL compatible DIO two 24 bit counter timers for TIO a 68 pin extended AO I O connector Because the NI 6722 6723 have no DIP switches jumpers or potentiometers they are easily software configured and calibrated For the NI 6722 6723 connector pinouts refer to Chapter 2 I O Connector Analog Output NI 6722 6723 The NI 6722 has eight channels of voltage output...

Страница 85: ...a Bus 13 Bit DAC 13 Bit DAC 13 Bit DAC 13 Bit DAC 13 Bit DAC 13 Bit DAC 13 Bit DAC EEPROM PFI Trigger Timing Digital I O 8 16 Bit ADC x4 x4 Load DAC Update Busy Clear DMA IRQ DAQ STC Analog Output Timing Control Digital I O Trigger Timing I O RTSI Bus Interface DMA IRQ Bus Interface Analog Output Analog Input Mite Interface Power On Reset FPGA Misc FIFO PCI MITE Generic Bus Interface PCI Bus Inter...

Страница 86: ...of TTL compatible DIO two 24 bit counter timers for TIO a 68 pin AO I O connector Because the NI 6731 6733 have no DIP switches jumpers or potentiometers they are easily software configured and calibrated For the NI 6731 6733 connector pinouts refer to Chapter 2 I O Connector Analog Output NI 6731 6733 The NI 6731 has four channels of voltage output at the I O connector and the NI 6733 has eight c...

Страница 87: ... Digital I O Trigger Counter Timing I O RTSI Bus Interface DMA IRQ Bus Interface Address Data Address Control EEPROM Control AO Control Calibration Control DMA IRQ Register Decode FPGA DAQ STC Bus Interface PCI MITE Generic Bus Interface PCI Bus Interface IRQ DMA AO 5 Latch 16 AO 5 16 Bit DAC AO 6 Latch 16 AO 6 16 Bit DAC AO 7 Latch 16 AO 7 16 Bit DAC DAC FIFO AO 5 Amp AO 6 Amp AO 7 Amp Data Data ...

Страница 88: ...n generate is determined by the update clock frequency fu and the number of samples per cycle Sc The onboard 20 MHz clock that generates fu can only be divided by an integer For example suppose you want to generate a sine wave at 2 kHz with 50 samples per cycle Substitute 2 kHz and 50 samples into the previous equation to get So fu equals 100 kHz The 20 MHz clock must be divided by 200 as shown by...

Страница 89: ... for the outputs of the NI 6713 is 0 V with an accuracy of 200 mV When the computer is powered on the output values might go to 100 110 mV which are within the specifications When you run LabVIEW or the test panels in MAX the driver loads the device s calibration constants into the device and the voltage drops to zero If there is any hardware connected to the device the best way to work around thi...

Страница 90: ...al Instruments Application Engineers make sure every question receives an answer For information about other technical support options in your area visit ni com services or contact your local office at ni com contact Training and Certification Visit ni com training for self paced training eLearning virtual classrooms interactive CDs and Certification program information You also can register for i...

Страница 91: ... ni com calibration If you searched ni com and could not find the answers you need contact your local office or NI corporate headquarters Phone numbers for our worldwide offices are listed at the front of this manual You also can visit the Worldwide Offices section of ni com niglobal to access the branch office Web sites which provide up to date contact information support phone numbers email addr...

Страница 92: ...e of or minus Ω Ohms Percent Plus or minus Positive of or plus A A Amperes the unit of electric current A D Analog to digital AC Alternating current ADC Analog to digital converter an electronic device often an integrated circuit that converts an analog voltage to a digital number AI 1 Analog input 2 Analog input channel signal AI HOLD COMP Analog input hold complete signal ...

Страница 93: ...ght lines The name used for a counter physical channel is an exception because that physical channel name is not the name of the terminal where the counter measures or generates the digital signal 2 Virtual a collection of property settings that can include a name a physical channel input terminal connections the type of measurement or generation and scaling information You can define NI DAQmx vir...

Страница 94: ... DAQ devices DAQ STC Data acquisition system timing controller an application specific integrated circuit ASIC for the system timing requirements of a general A D and D A system data acquisition DAQ 1 Acquiring and measuring analog or digital electrical signals from sensors transducers and test probes or fixtures 2 Generating analog or digital electrical signals dB Decibel the unit for expressing ...

Страница 95: ...ommands the device accepts E EEPROM Electrically erasable programmable read only memory ROM that can be erased with an electrical signal and reprogrammed ESD Electrostatic Discharge a high voltage low current discharge of static electricity that can damage sensitive electronic components Electrostatic discharge voltage can easily range from 1 000 to 10 000 V F FPGA Field programmable gate array H ...

Страница 96: ...lds and so on A module contains everything required to occupy one or more slots in a mainframe 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 N NC Normally closed or not connected NI National Instruments NI DAQ Driver software included with all NI measurement devices NI DAQ i...

Страница 97: ...computers electrical storms welders radio transmitters and internal sources such as semiconductors resistors and capacitors Noise corrupts signals you are trying to send or receive NRSE Nonreferenced single 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 P PCI Pe...

Страница 98: ...d to express the rate at which a digitizer or D A converter or DAQ device samples an analog signal scan interval Controls how often a scan is initialized is regulated by the AI SAMP signal scan rate Reciprocal of the scan interval SCXI Signal Conditioning eXtensions for Instrumentation the National Instruments product line for conditioning low level signals within an external chassis near sensors ...

Страница 99: ...cy An upgrade to the earlier version of NI DAQ Traditional NI DAQ Legacy has the same VIs and functions and works the same way as NI DAQ 6 9 x You can use both Traditional NI DAQ Legacy and NI DAQmx on the same computer which is not possible with NI DAQ 6 9 x transducer See sensor tsc Source clock period tsp Source pulse width TTL Transistor transistor logic a digital circuit composed of bipolar t...

Страница 100: ...ents typically used with a PC that has the functionality of a classic stand alone instrument 2 A LabVIEW software module VI which consists of a front panel user interface and a block diagram program VIH Volts input high VIL Volts input low Vin Volts in VOH Volts output high VOL Volts output low Vrms Volts root mean square virtual channel See channel ...

Страница 101: ...3 calibration certificate NI resources C 2 conventions ix correlated DIO DI Sample Clock 4 4 digital waveform acquisition 4 3 digital waveform generation 4 2 DO Sample Clock 4 2 counter applications 5 10 counter timing signals Counter 0 Gate 5 4 Counter 0 Internal Output 5 5 Counter 0 Source 5 3 Counter 0 Up Down 5 6 Counter 1 Gate 5 7 Counter 1 Internal Output 5 8 Counter 1 Source 5 7 Counter 1 U...

Страница 102: ...gure 2 4 NI 6723 figure 2 5 NI 6731 figure 2 2 NI 6733 figure 2 3 NI DAQCard 6715 figure 2 3 signal descriptions 2 9 I O protection 4 5 instrument drivers NI resources C 1 interrupt request IRQ 9 2 interrupts 9 2 K KnowledgeBase C 1 L LabVIEW documentation xii LabWindows CVI documentation xii M Measurement Studio documentation xii minimizing glitches 3 3 N National Instruments support and services...

Страница 103: ...on 3 3 related documentation x RTSI 8 1 S signal descriptions 2 9 software NI resources C 1 support technical C 1 synchronizing multiple devices 8 4 T technical support xv C 1 terminal name equivalents 2 7 timing signal routing 7 1 device and RTSI clocks 8 3 RTSI 8 1 RTSI triggers 8 1 timing signals connecting 7 3 counter 5 2 power on state 4 5 routing 7 1 waveform generation 3 6 training xiv trai...

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