NI PXI-6682 User Manual
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NI PXI-6682 User Manual

Timing and synchronization module for pxi
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  • Page 1 Artisan Technology Group is your source for quality new and certified-used/pre-owned equipment SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT • FAST SHIPPING AND DELIVERY Experienced engineers and technicians on staff Sell your excess, underutilized, and idle used equipment at our full-service, in-house repair center We also offer credit for buy-backs and trade-ins •...
  • Page 2 NI PXI-6682 User Manual Timing and Synchronization Module for PXI NI PXI-6682 User Manual October 2007 372292A-01 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 3 Support Worldwide Technical Support and Product Information ni.com National Instruments Corporate Headquarters 11500 North Mopac Expressway Austin, Texas 78759-3504 USA Tel: 512 683 0100 Worldwide Offices Australia 1800 300 800, Austria 43 662 457990-0, Belgium 32 (0) 2 757 0020, Brazil 55 11 3262 3599,...
  • Page 4 Warranty The NI PXI-6682 is warranted against defects in materials and workmanship for a period of one year from the date of shipment, as evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace equipment that proves to be defective during the warranty period.
  • Page 5 These classes are known as Class A (for use in industrial-commercial locations only) or Class B (for use in residential or commercial locations). All National Instruments (NI) products are FCC Class A products. Depending on where it is operated, this Class A product could be subject to restrictions in the FCC rules. (In Canada, the Department of Communications (DOC), of Industry Canada, regulates wireless interference in much the same way.) Digital...

  • Page 6: Table Of Contents

    Chapter 2 Installing and Configuring Installing the Software ....................2-1 Installing the Hardware....................2-1 Configuring the Module....................2-2 Chapter 3 Hardware Overview NI PXI-6682 Front Panel ....................3-3 GPS LED ......................3-3 1588 LED ......................3-4 Speed LED.......................3-4 ACT/LINK LED....................3-5 Connectors.......................3-5 Hardware Features ......................3-6 Clock and Event Generation ..................3-8 PXI_CLK10 and TCXO ..................3-8...
  • Page 7 CE Compliance ....................A-9 Environmental Management ................A-9 Appendix B IRIG Protocol Overview Appendix C Technical Support and Professional Services Glossary Index NI PXI-6682 User Manual ni.com Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 8: About This Manual

    About This Manual This manual describes the electrical and mechanical aspects of the NI PXI-6682, and contains information concerning its operation and programming. Conventions The following conventions appear in this manual: <> Angle brackets that contain numbers separated by an ellipsis represent a range of values associated with a bit or signal name—for example,...

  • Page 9: National Instruments Documentation

    Use this documentation for hardware installation and configuration instructions, specifications about the measurement hardware, and application hints. • Software documentation—Refer to the NI-Sync User Manual, available at ni.com/manuals You can download NI documentation from ni.com/manuals...

  • Page 10: Introduction

    PXI embedded controller or a desktop computer connected to the PXI chassis using MXI hardware If you are using the NI PXI-6682 in a system to synchronize NI PXI-4472, NI PXI-5112, NI PXI-5411, NI PXI-6115, or E Series DAQ modules, you...

  • Page 11: Unpacking

    Chapter 1 Introduction Unpacking The NI PXI-6682 is shipped in an antistatic package to prevent electrostatic damage to the module. Electrostatic discharge (ESD) can damage several components on the module. Caution Never touch the exposed pins of connectors. To avoid such damage in handling the module, take the following precautions: •...

  • Page 12: Safety Information

    Avoid contact between your body and the connector block signal when hot swapping modules. Remove power from signal lines before connecting them to or disconnecting them from the product. © National Instruments Corporation NI PXI-6682 User Manual Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 13 MAINS is defined as a hazardous live electrical supply system that powers equipment. Suitably rated measuring circuits may be connected to the MAINS for measuring purposes. NI PXI-6682 User Manual ni.com Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 14: Installing And Configuring

    Refer to the file that accompanies the NI-Sync CD for readme.htm software installation directions. Be sure to install the driver software before installing the NI PXI-6682 hardware. Note Installing the Hardware The following are general installation instructions. Consult the chassis user manual or technical reference manual for specific instructions and warnings about installing new modules.

  • Page 15: Configuring The Module

    Chapter 2 Installing and Configuring Configuring the Module The NI PXI-6682 is completely software configurable. The system software automatically allocates all module resources. The two LEDs on the front panel provide information about module status. The front panel description sections of Chapter 3,...

  • Page 16: Hardware Overview

    Hardware Overview This chapter presents an overview of the hardware functions of the NI PXI-6682, shown in Figure 3-1. Figure 3-1. Isometric View of the NI PXI-6682 © National Instruments Corporation NI PXI-6682 User Manual Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 17 Chapter 3 Hardware Overview Figure 3-2 provides a functional overview of the NI PXI-6682. AC Coupled PXI_CLK10_IN CLKIN Clock Detector TCXO AC Coupling CLKOUT PXI_CLK10 To GPS GPS RF Antenna Detector PFI 0 IRIG-B Receiver PXI_STAR<0..12> Synchronization PFI0 Digital PXI_TRIG<0..7>...

  • Page 18: Ni Pxi-6682 Front Panel

    4 CLKOUT Connector 9 Ethernet ACT/LINK LED 5 CLKIN Connector 10 Ethernet Connector Figure 3-3. NI PXI-6682 Front Panel GPS LED The GPS LED indicates the status of the GPS hardware. Refer to Figure 3-3 for the GPS LED location.

  • Page 19: 1588 Led

    (2 seconds) Faulty * 1588 has been disabled or stopped. Speed LED The Speed LED indicates the NI PXI-6682 Ethernet link speed. Refer to Figure 3-3 for the Speed LED location. NI PXI-6682 User Manual ni.com Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 20: Act/Link Led

    When there is no Ethernet link the Speed LED is off. ACT/LINK LED The ACT/LINK LED indicates the NI PXI-6682 Ethernet link condition. Refer to Figure 3-3 for the ACT/LINK LED location. Table 3-4 summarizes what the ACT/LINK LED colors represent.

  • Page 21: Hardware Features

    Connections that exceed any of the maximum ratings of input or output signals on the NI PXI-6682 can damage the module, the computer, or other devices connected to the PXI-6682. NI is not liable for any damage resulting from such signal connections.
  • Page 22 PXI_CLK10 This signal is the PXI 10 MHz backplane clock. By default, this signal is the output of the native 10 MHz oscillator in the chassis. An NI PXI-6682 in Slot 2 can replace this signal with PXI_CLK10_IN. Oscillator This is the output of the 10 MHz TCXO. The TCXO is a very stable and accurate frequency source.

  • Page 23: Clock And Event Generation

    An NI PXI-6682 module in Slot 2 of a PXI chassis can replace the native PXI 10 MHz backplane frequency reference clock (PXI_CLK10) with the more stable and accurate output of the TCXO. All other PXI modules in the chassis that reference the 10 MHz backplane clock benefit from this improved reference.

  • Page 24: Routing Signals

    PXI triggers. In addition, the polarity of the destination signal can be inverted, which is useful when handling active-low digital signals. The NI PXI-6682 also can route a 10 MHz clock from CLKIN to the PXI 10 MHz reference clock. The NI PXI-6682 can route the TCXO, or PXI 10 MHz reference clock to CLKOUT.

  • Page 25: Determining Sources And Destinations

    Table 3-6 summarizes the sources and destinations of the NI PXI-6682. The destinations are listed in the horizontal heading row, and the sources are listed in the column at the far left. A ✓ in a cell indicates that the source and destination combination defined by that cell is a valid routing combination.

  • Page 26: I/O Considerations

    Mbps or 100 Mbps. The Ethernet port is auto-MDI capable, which means crossover cabling is not necessary when connecting the NI PXI-6682 to another network card. The NI PXI-6682 senses whether a crossed connection is needed and performs the action internally. The Ethernet port also allows for full duplex operation, so traffic can be sent and received at the same time.

  • Page 27: Using Front Panel Pfi Terminals As Outputs

    The front panel PFI terminals can be configured by software to accept input signals. Refer to the NI-Sync User Manual for information on how to set up the PFI terminals to accept input signals. You can use these terminals to timestamp triggers with the synchronized system time or to route signals to other destinations (refer to Table 3-6).

  • Page 28: Note Regarding Pfi0

    NI recommends transmitting clocks using the PXI_STAR triggers. However, if you must use the PXI Triggers, the frequency on the PXI Triggers should not exceed 20 MHz to preserve signal integrity.

  • Page 29: Using The Pxi Star Triggers

    1 ns. A typical upper limit for the skew in most NI PXI chassis is 500 ps. The low skew of the PXI star trigger bus is useful for applications that require triggers to arrive at several modules nearly simultaneously.

  • Page 30: Choosing The Type Of Routing

    Choosing the Type of Routing The NI PXI-6682 routes signals in one of two ways: asynchronously or synchronously. The following sections describe the two routing types and the considerations for choosing each type.

  • Page 31: Synchronous Routing

    Chapter 3 Hardware Overview • Time for the receiver to recognize the signal The source of an asynchronous routing operation on the NI PXI-6682 can be any of the following lines: • Any front panel PFI pin (PFI<0..2>) • Any PXI Star trigger line (PXI_STAR<0..12>) •...
  • Page 32 Any PXI star trigger line (PXI_STAR <0..12>) • Any PXI Trigger line (PXI_TRIG <0..7>) In the NI PXI-6682 the synchronization clock for synchronous routes is always PXI_CLK10. Note The possible destinations for a synchronous route are identical to those for an asynchronous route.

  • Page 33: Synchronization

    This makes the GPS system a precise timing and synchronization source. The NI PXI-6682 has a GPS receiver which powers an active GPS antenna and receives and processes the RF signals (1.575 GHz) from the satellites. The GPS receiver then generates a very precise pulse-per-second (PPS) that the NI PXI-6682 uses to achieve sub-microsecond synchronization.
  • Page 34 PXI-6682 will be able to accept a 1kHz AM modulated IRIG-B 12X signal on its PFI0 input. When configured to synchronize to an IRIG-B DC source, the NI PXI-6682 will be able to accept an IRIG-B 00X DC encoded signal on its PFI0 input.

  • Page 35: Ieee 1588

    The NI PXI-6682 is capable of using a PPS (pulse per second) signal for synchronization. Any PFI, PXI_Trigger or PXI_Star line can be configured as the PPS input terminal.

  • Page 36: Operating Environment

    Timing System Performance The NI PXI-6682 can generate or receive a 1 Hz pulse per second signal on any PFI or PXI Trigger terminal. You can set up this signal to transition on the seconds boundary of the synchronized system time.

  • Page 37: Gps Synchronization Best Practices

    If it is impossible to use a 100 Mbps network and you must run IEEE 1588 synchronization using a 10 Mbps network, ensure the network interface of the NI PXI-6682 is explicitly configured for 10 Mbps Full Duplex operation using the Windows configuration panels.

  • Page 38: Appendix A Specifications

    Functional operation of the device outside the conditions indicated in the operational parts of the specification is not implied. © National Instruments Corporation NI PXI-6682 User Manual Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 39 Functional operation of the device outside the conditions indicated in the operational parts of the specifications is not implied. Relative to CLKOUT when set up to route PXI_CLK10. NI PXI-6682 User Manual ni.com Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 40 Functional operation of the device outside the conditions indicated in the operational parts of the specifications is not implied. © National Instruments Corporation NI PXI-6682 User Manual Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 41 Input characteristics for IRIG-B DC..same as PFI digital input characteristics listed above The following assumptions are made regarding the received IRIG-B signal. All conditions must be met for the NI PXI-6682 to be able to synchronize accurately: • Seconds begin every minute at 0, increment to 59, and then roll-over to 0.
  • Page 42 PXI_TRIG <0..7> output ....22 to 36 ns, typical PXI Trigger Characteristics PXI_TRIG <0..7> to PXI_TRIG <0..7> output skew at NI PXI-6682 backplane connector..< 5 ns, typical Asynchronous delay, t PXI_TRIG <0..7> to PFI <0..2> output ......18 to 34 ns, typical...
  • Page 43 Velocity ...........0.06 m/s Trimble Bullet III gain at 1575.42 MHz ........35 dB Signal strength required at PXI-6682 ..18 dB Maximum signal loss at 1575.42 MHz...17 dB Note The GPS antenna kit offered by National Instruments comes with a 30 m cable which has a loss of 15 dB/100 ft, making the total loss in the cable approximately 14.8 dB.
  • Page 44 12 hours. 2. For the GPS test, two PXI-6682 boards were independently synchronizing to GPS and configured to generate a PPS. The specification above represents empirical results. Please note that GPS satellites are only guaranteed to be within 100ns of UTC. Therefore, the offset between any two devices synchronizing can be as high as 200 ns plus the offset of that device to GPS.
  • Page 45 Nonoperating ........5 to 500 Hz, 2.4 g (Tested in accordance with IEC-60068-2-64. Nonoperating test profile exceeds the requirements of MIL-PRF-28800F, Class 3.) NI PXI-6682 User Manual ni.com Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 46: Safety

    National Instruments is committed to designing and manufacturing products in an environmentally responsible manner. NI recognizes that eliminating certain hazardous substances from our products is beneficial not only to the environment but also to NI customers. © National Instruments Corporation NI PXI-6682 User Manual...
  • Page 47 Appendix A Specifications For additional environmental information, refer to the NI and the Environment Web page at . This page contains the ni.com/environment environmental regulations and directives with which NI complies, as well as any other environmental information not included in this document.

  • Page 48: Irig Protocol Overview

    © National Instruments Corporation NI PXI-6682 User Manual Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 49 The second’s boundary is embedded into the transmission by sending two consecutive position identifiers; the beginning of the second position identifier is the second’s boundary. NI PXI-6682 User Manual ni.com Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 50 IRIG-B is one of the most common IRIG standards used. The following table describes how the information is transmitted when using IRIG-B each second. © National Instruments Corporation NI PXI-6682 User Manual Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 51 Nine lowest significant bits of time of day in straight binary seconds (bit 80 -> 2 … bit 88 -> 2 Position Identifier P NI PXI-6682 User Manual ni.com Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 52 If the IRIG-B signal includes the year, then it also uses that information to synchronize its clock. Otherwise, it gets the year from the host computer. The NI PXI-6682 disregards the rest of the information contained in the IRIG-B signal. Therefore, when configured to synchronize to IRIG-B AM, the NI PXI-6682 supports IRIG-B 12X, and when configured to synchronize to IRIG-B DC, it supports IRIG-B 00X.
  • Page 53 – Free Technical Support—All registered users receive free Basic Service, which includes access to hundreds of Application Engineers worldwide in the NI Discussion Forums at . National Instruments Application Engineers ni.com/forums make sure every question receives an answer.
  • Page 54 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 to access the branch ni.com/niglobal...
  • Page 55 © National Instruments Corporation NI PXI-6682 User Manual Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 56 A/D and/or DIO devices plugged into a computer, and possibly generating control signals with D/A and/or DIO devices in the same computer direct current electrostatic discharge NI PXI-6682 User Manual ni.com Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 57 LabVIEW a graphical programming language light-emitting diode—a semiconductor light source © National Instruments Corporation NI PXI-6682 User Manual Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 58 The PXIbus standard was originally developed by National Instruments in 1997, and is now managed by the PXIbus Systems Alliance. NI PXI-6682 User Manual ni.com Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 59 PXI_Trig/PXI_Star the clock signal that is used to synchronize the PXI Triggers or PXI_STAR synchronization clock triggers on an NI PXI-6682 PXI Trigger the PXI timing bus that connects PXI devices directly, by means of connectors on top of the devices, for precise synchronization of functions...
  • Page 60 Glossary setup time setup volts virtual instrument NI PXI-6682 User Manual ni.com Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 61 ACT/LINK LED color explanation (table), 3-5 overview, 3-5 asynchronous routing Declaration of Conformity (NI resources), C-1 overview, 3-15 destinations, possible destinations (table), 3-11 sources and destinations, 3-16 diagnostic tools (NI resources), C-1 timing diagram, 3-15...
  • Page 62 Index GPS LED, 3-3 best practices, 4-3 NI PXI-6682 diagram, 3-3 GPS, 4-1 Speed LED, 3-4 IEEE1855, 4-3 front panel PFI terminals, using as inputs, 3-12 IRIG-B, 4-1 help technical support, C-1 generating a clock PXI_CLK10 and TCXO, 3-8 generating a clock or event...
  • Page 63 PXI_TRIG <0..7> hardware, 2-1 asynchronous routing, 3-16 software, 2-1 signal description (table), 3-7 parts locator diagram, 3-3 specifications, A-5 NI support and services, C-1 related documentation, viii operating environment, 4-4 RJ-45 Ethernet connector description, 3-6 routing architecture (figure), 3-10 routing signals PFI <0..2>...
  • Page 64 TCXO characteristics, A-5 specifications, A-5 timestamping characteristics, A-5 timing system performance, 4-4 Speed LED training and certification (NI resources), C-1 color explanation (table), 3-5 trigger bus. See PXI_TRIG <0..7> overview, 3-4 troubleshooting (NI resources), C-1 star triggers. See PXI_STAR <0..12>...
  • Page 65 Artisan Technology Group is your source for quality new and certified-used/pre-owned equipment SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT • FAST SHIPPING AND DELIVERY Experienced engineers and technicians on staff Sell your excess, underutilized, and idle used equipment at our full-service, in-house repair center We also offer credit for buy-backs and trade-ins •...

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