National Instruments NI 6608 User Manual
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National Instruments NI 6608 User Manual

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  • Page 1 (217) 352-9330 | Click HERE Find the National Instruments PCI-6601 at our website:...
  • Page 2 NI 660x User Manual NI 6601, NI 6602, and NI 6608 Devices NI 660x User Manual December 2006 372119A-01...
  • Page 3 Thailand 662 278 6777, Turkey 90 212 279 3031, United Kingdom 44 0 1635 523545 For further support information, refer to the Technical Support and Professional Services appendix. To comment on National Instruments documentation, refer to the National Instruments Web site at and enter ni.com/info the info code feedback ©...
  • Page 4 Warranty The NI 6601, NI 6602, and NI 6608 devices are 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

    When to Use Duplicate Count Prevention............2-7 When Not to Use Duplicate Count Prevention..........2-7 Transfer Rates ........................2-8 High Precision Clock (NI 6608) ..................2-9 Using the OCXO as the SOURCE Counter ............2-9 Using the OCXO as the 10 MHz PXI Backplane Clock .........2-9 Measuring OCXO Stable Frequency Deviation ..........2-10...
  • Page 7 Contents Chapter 3 Signal Connections Programmable Function Interfaces (PFIs)..............3-1 Digital Filtering ......................3-1 Power-On State......................3-3 Pin Assignments ......................3-4 I/O Connector Pinout..................... 3-6 Outputs .......................... 3-8 Counters......................... 3-10 Counter n Source Signal ................. 3-10 Counter Source to Counter Out Delay..........3-12 Counter n Gate Signal ..................

  • Page 8: About This Manual

    About This Manual This manual describes the electrical and mechanical aspects of the National Instruments NI 6601, NI 6602, and NI 6608 devices, and contains information about device operation and programming. Unless otherwise noted, text applies to all NI 660x devices. The PCI and PXI implementations are the same in functionality;...

  • Page 9: Related Documentation

    • NI 660x Specifications—This document contains specifications for the NI 6601, NI 6602, and NI 6608 devices. It available for download at ni.com/manuals • DAQ Getting Started Guide—This guide describes how to install the NI-DAQ 7.x software and the DAQ device, and how to confirm that the...

  • Page 10: Technical Support On The Web

    PDFs. Refer to the Adobe Systems Incorporated Web site at to download Acrobat Reader. Refer to the www.adobe.com National Instruments Product Manuals Library at ni.com/manuals updated documentation resources. © National Instruments Corporation NI 660x User Manual...

  • Page 11: Introduction

    TTL/CMOS-compatible digital I/O. The NI 6602 offers this capability and four additional 32-bit counter channels. The NI 6608 is a functional superset of the NI 6602 device with a high-stability clock called an oven-controlled crystal oscillator (OCXO). The counter/timer channels have many measurement and generation...

  • Page 12: Getting Started

    Chapter 1 Introduction The specification permits vendors to develop sub-buses that coexist with the basic PCI interface on the bus. Compatible operation is not guaranteed between devices with different sub-buses nor between devices with sub-buses and PXI. The standard implementation for does not include these sub-buses.

  • Page 13: Accessories And Cables

    BNC connector block with built-in test features CA-1000 Configurable connector accessory SCB-68 Shielded screw connector block TB-2715 Front-mount terminal block for NI PXI-660x TBX-68 DIN-rail connector block CB-68LP Low-cost screw connector block CB-68LPR Low-cost screw connector block © National Instruments Corporation NI 660x User Manual...

  • Page 14: Device Overview

    (or two) and rolls over. This counter is specifically designed for this application and can count signals that are faster than the general purpose counters. The CtrnSource signal on the general purpose counter will be the divided signal from the simple counter. © National Instruments Corporation NI 660x User Manual...

  • Page 15: Pad Synchronization

    Chapter 2 Device Overview Figure 2-1 shows an example of prescaling. External Signal Prescaler Rollover (Used as Source by Counter) Counter Value Figure 2-1. Prescaling Example Prescaling is intended for use with two counter period and frequency measurements where the measurement is made on a continuous, repetitive signal.
  • Page 16 PFI 38 at CTR 1 GATE 1/4 Cycle Synchronized GATE at Ctr0 Synchronized GATE at Ctr1 Figure 2-2. Counter 0 at Gate Edge on PFI 38 One Source Period before Counter 1 © National Instruments Corporation NI 660x User Manual...

  • Page 17: Duplicate Count Prevention

    Chapter 2 Device Overview Counter Source PFI 38 at Input to ASIC PFI 38 Synchronized at Pad 1 1/2 Cycles PFI 38 at CTR 0 GATE PFI 38 at CTR 1 GATE 1/4 Cycle Synchronized GATE at Ctr0 Synchronized GATE at Ctr1 Figure 2-3.

  • Page 18: Example Application That Works Correctly (No Duplicate Counting)

    So the counter does not detect a rising edge in the Gate until the next Source pulse. In this example, the counter stores the values in the buffer on the first rising Source edge after the rising edge of Gate. © National Instruments Corporation NI 660x User Manual...

  • Page 19: Example Application That Works Incorrectly (Duplicate Counting)

    Chapter 2 Device Overview Example Application That Works Incorrectly (Duplicate Counting) In Figure 2-5, after the first rising edge of Gate, no Source pulses occur. So the counter does not write the correct data to the buffer. No Source edge, so no value written to buffer.

  • Page 20: Enabling Duplicate Count Prevention In Ni-Daqmx

    When Not to Use Duplicate Count Prevention Use duplicate counter prevention only for buffered measurements with an external CtrnSource signal. Do not use it when the CtrnSource signal is greater than one-fourth of the maximum timebase. © National Instruments Corporation NI 660x User Manual...

  • Page 21: Transfer Rates

    Chapter 2 Device Overview Transfer Rates The maximum sustainable transfer rate a TIO device can achieve for a buffered acquisition depends on the following factors: • Amount of available bus bandwidth • Processor speed and operating system • Application software To reduce the amount of bus activity, limit the number of devices generating bus cycles.

  • Page 22: High Precision Clock (Ni 6608)

    High Precision Clock (NI 6608) The accuracy of your time measurement and pulse generation is determined by the timing accuracy of your counter clock. The NI 6608 device has an oven-controlled crystal oscillator (OCXO) that provides a highly stable 10 MHz clock that you can use as a GATE or SOURCE of a counter. You can also use the OCXO as the PXI backplane clock.

  • Page 23: Measuring Ocxo Stable Frequency Deviation

    Figure 2-7. OCXO as the 10 MHz PXI Backplane Clock Measuring OCXO Stable Frequency Deviation When you power the NI 6608 device, the OCXO requires adequate warm-up time to reach stable frequency. Five minutes is adequate warm-up time for a power-off duration of less than one hour, with maximum deviation within 20 ppb, or parts per billion, while four hours of operation is adequate for a power-off duration of up to 90 days.
  • Page 24 (days 366–375) will now be 5.63 ppb—the stable frequency in this case will be 10 MHz ± 5.63 ppb after 375 days of operation. Calibration does not affect the drift in frequency; it only changes the stable frequency. © National Instruments Corporation 2-11 NI 660x User Manual...

  • Page 25: Calibration

    Manual Calibration Procedures and select your device from the list. You can calibrate these devices in Traditional NI-DAQ (Legacy) only. Note When calibrating the NI 6608, use an external clock with a short-term stability (over a period of 100 s) of better than 5 × 10 –11 ;...

  • Page 26: Signal Connections

    The filter circuit samples the signal on the PFI line on each rising edge of the sampling clock. A change in the signal is propagated only if it maintains its new state for at least the duration © National Instruments Corporation NI 660x User Manual...
  • Page 27 Chapter 3 Signal Connections between two consecutive rising edges of the filter clock timebase. The frequency of the filter clock timebase determines whether a transition in the signal may propagate or not. The function of the internal sampling clock is to increase the sampling rate and prevent aliasing.

  • Page 28: Power-On State

    NI 660x. These connections affect the drive strength of the NI 660x when the lines pulled up or down are used as outputs. © National Instruments Corporation NI 660x User Manual...

  • Page 29: Pin Assignments

    Chapter 3 Signal Connections Pin Assignments Table 3-2 lists the pin assignments for the I/O connector on the NI 660x. Note The NI 6601 uses counters <0..3> only. Table 3-2. NI 660x Connector Pin Assignments Motion Counter Counter Motion Signal Encoder Context Context...
  • Page 30 — — Reserved PFI 38 index/z(0) — CTR 0 — — — Reserved GATE PFI 39 channel — CTR 0 — — — A(0) +5 V — — — — — — © National Instruments Corporation NI 660x User Manual...

  • Page 31: I/O Connector Pinout

    Chapter 3 Signal Connections I/O Connector Pinout Figure 3-2 shows the pin assignments for the I/O connectors on the NI 660x. Note The NI 6601 uses counters <0..3> only. NI 660x User Manual ni.com...
  • Page 32 D GND +5 V R GND RG: Reserved if using an SH68-68-D1 shielded cable. Ground if using an R6868 ribbon cable. No Connect on NI 6601 Figure 3-2. NI 660x Connector Pinout © National Instruments Corporation NI 660x User Manual...

  • Page 33: Outputs

    Chapter 3 Signal Connections Outputs PFI <0..7> are used for DIO only. PFI <32..39> are used for counters and motion encoders only. You can use PFI <8..31> as either of the three choices. When used as an output, you can individually configure each PFI line as a DIO line or a counter line (you need not distinguish between counter/encoder or DIO applications when you use a PFI line as an input).
  • Page 34 CTR 1 SOURCE PFI 36 CTR 0 OUT PFI 37 Input only PFI 38 CTR 0 GATE PFI 39 CTR 0 SOURCE Counters 4 through 7 are not available in NI 6601 devices. © National Instruments Corporation NI 660x User Manual...

  • Page 35: Counters

    The counters on TIO devices have two internal timebases: 100 kHz and 20 MHz. The counters on the NI 6602 and NI 6608 also have an 80 MHz timebase. Each counter has a gate, auxiliary, and source input. Each of these inputs can be an internal or external signal that connects to the I/O connector.
  • Page 36 (with prescaling) Tsrcper (without 50 ns 12.5 ns 50 ns CtrnSource minimum period prescaling) (without prescaling) Tsrcper (with 16.67 ns 8 ns 16.67 ns CtrnSource minimum period prescaling) (with prescaling) © National Instruments Corporation 3-11 NI 660x User Manual...

  • Page 37: Counter Source To Counter Out Delay

    Chapter 3 Signal Connections Counter Source to Counter Out Delay Figure 3-4 shows the CtrnSource to CtrnInternalOutput delay. CtrnSource CtrnInternalOutput Figure 3-4. CtrnSource to CtrnInternalOutput Delay Figure 3-4 shows the delay between the active edge of the CtrnSource signal and the active edge of the CtrnInternalOutput signal. In the figure, the CtrnSource and CtrnInternalOutput signals are active high.

  • Page 38: Counter N Gate Signal

    CtrnGate minimum pulse width For buffered measurements, the minimum period required for the CtrnGate signal is Note determined by how fast the system can transfer data from your device to computer memory. © National Instruments Corporation 3-13 NI 660x User Manual...

  • Page 39: Counter N Auxiliary Signal

    Chapter 3 Signal Connections Counter n Auxiliary Signal You can select any PFI or RTSI, as well as many other internal signals as the Counter n Auxiliary (CtrnAux) signal. Much like this CtrnGate signal, the CtrnAux signal is configured in edge-detection or level-detection mode depending on the application performed by the counter.

  • Page 40: Hardware Arm Start Triggers

    • Counting Edges • Frequency Measurement • Period Measurement • Position Measurement with Linear and Angular Encoders • Pulse Width Measurement • Semi-Period Measurement • Two-Edge Separation Measurement • Pulse Generation © National Instruments Corporation 3-15 NI 660x User Manual...

  • Page 41: Real-Time System Integration Bus

    NI-DAQmx Help, and/or use the examples that are available with NI-DAQmx. Real-Time System Integration Bus TIO devices use the National Instruments Real-Time System Integration (RTSI) bus to easily synchronize several measurement functions to a common trigger or timing event. In a PCI system, the RTSI bus consists of the RTSI bus interface and a ribbon cable.
  • Page 42 PCI chassis that does not have the 10 MHz PXI backplane clock, the phase locking is automatically disabled. Additionally, PXI trigger line 6 corresponds to PXI star trigger on PXI TIO devices. © National Instruments Corporation 3-17 NI 660x User Manual...

  • Page 43: +5 V Power Source

    Do not connect the +5 V power pin directly to D GND, RG, or any pin configured for output on the NI 660x device, or any voltage source or output pin on another device. Doing so can damage the device and the computer. National Instruments is not liable for damages resulting from such a connection.

  • Page 44: I/O Signals

    Protect signal lines from magnetic and electric fields caused by monitors, electric motors, welding equipment, breakers, transformers, or other devices by running them through special metal conduits. • Use appropriate digital filtering to remove noise. © National Instruments Corporation 3-19 NI 660x User Manual...

  • Page 45: Crosstalk

    Chapter 3 Signal Connections Crosstalk Crosstalk mainly occurs when the capacitance between lines in a cable induces a smaller transition on another line. Figure 3-9 shows an example of crosstalk. Cable PFI 11 Capacitance PFI 10 PFI 10 PFI 11 Figure 3-9.

  • Page 46: Inductive Effects

    The SH68-68-D1 cable is designed to help minimize inductive effects. Each signal line is twisted with a ground wire connected to a nearby pin. Each ground wire is shared by two signal lines. © National Instruments Corporation 3-21 NI 660x User Manual...
  • Page 47 Chapter 3 Signal Connections Table 3-9 lists the signals and the D GND pin number on the 68-pin connector block. Table 3-9. Signals and D GND Pin Number on 68-Pin Connector Block PFI Number Pin Number for D GND PFI 0 PFI 1 PFI 2 PFI 3...

  • Page 48: Transmission Line Effects

    For reflection problems that occur when the device drives the signal, use parallel AC termination at the destination. When using a National Instruments SH68-68-D1 cable, the recommended values for R and C 68 W and 150 pF, respectively. © National Instruments Corporation 3-23 NI 660x User Manual...
  • Page 49 Chapter 3 Signal Connections For reflection problems that occur when the NI 660x receives the signal, use series termination at the device driving the signal. The sum of R and the output impedance of the source is approximately 80 W. Typically, this condition results in a value of approximately 50 W for R .

  • Page 50: Technical Support And Professional Services

    Technical Support and Professional Services Visit the following sections of the National Instruments Web site at for technical support and professional services: ni.com • Support—Online technical support resources at ni.com/support include the following: – Self-Help Resources—For answers and solutions, visit the...
  • Page 51 Appendix A Technical Support and Professional Services • Calibration Certificate—If your product supports calibration, you can obtain the calibration certificate for your product at ni.com/calibration If you searched and could not find the answers you need, contact ni.com your local office or NI corporate headquarters. Phone numbers for our worldwide offices are listed at the front of this manual.

  • Page 52: Glossary

    To enable a counter to start an operation. If the application requires a trigger, an armed counter waits for the trigger to begin the operation. ASIC application specific integrated circuit © National Instruments Corporation NI 660x User Manual...
  • Page 53 Glossary asynchronous A property of an event that occurs at an arbitrary time, without synchronization to a reference clock. bit—one binary digit, either 0 or 1. byte—eight related bits of data, an eight-bit binary number. Also used to denote the amount of memory required to store one byte of data. base address A memory address that serves as the starting address for programmable registers.
  • Page 54 DIO boards plugged into a computer, and possibly generating control signals with D/A and/or DIO boards in the same computer. DAQ-STC A custom ASIC developed by National Instruments that provides timing information and general-purpose counter/timers on National Instruments E Series boards.
  • Page 55 Glossary direct memory access—a method by which data can be transferred to/from computer memory from/to a device or memory on the bus while the processor does something else. DMA is the fastest method of transferring data to/from computer memory. driver Software that controls a specific hardware device such as a DAQ board.
  • Page 56 The fastest internal timebase available on a device. For NI 6601 devices, the maximum timebase is 20 MHz. For NI 6602 devices, the maximum timebase is 80 MHz. minimum © National Instruments Corporation NI 660x User Manual...
  • Page 57 Glossary MITE A custom ASIC designed by National Instruments that implements the PCI bus interface. The MITE supports bus mastering for high speed data transfers over the PCI bus. motion encoders Transducers that generate pulses to indicate the physical motion of a device.
  • Page 58 The oscillation of a signal about a high-voltage or low-voltage state immediately following a transition to that state. RTSI Bus real-time system integration bus—the National Instruments timing bus that connects DAQ boards directly, by means of connectors on top of the boards, for precise synchronization of functions.
  • Page 59 Glossary start trigger A TTL level signal having two discrete levels, a high and a low level, that starts an operation. synchronous A property of an event that is synchronized to a reference clock. terminal count—a strobe that occurs when a counter reaches zero from either direction.
  • Page 60 Glossary Virtual Instrument. A LabVIEW program; so-called because it models the appearance and function of a physical instrument. wire Data path between nodes. © National Instruments Corporation NI 660x User Manual...

  • Page 61: Index

    3-1 to 3-3 DMA channels, 2-8 example (figure), 3-2 transfer rates, 2-8 to 2-9 pad synchronization, 2-2 Declaration of Conformity (NI resources), A-1 settings (table), 3-3 diagnostic tools (NI resources), A-1 © National Instruments Corporation NI 660x User Manual...
  • Page 62 (NI resources), A-1 register-level, 2-12 pulse width MITE, 1-1 digital filtering, 3-2, 3-3 table, 3-3 minimum, 3-11, 3-13 National Instruments support and services, minimum for internal signals (table), 3-13 PXI backplane clock noise, 3-3, 3-19 OCXO, 2-9 phase locking, 3-17 OCXO NI 660x User Manual ni.com...
  • Page 63 Counter n Internal Output, 3-14 Counter n Source, 3-10 software counter applications, 3-15 NI resources, A-1 register-level programming, 2-12 specifications, 1-1 stable frequency change in, 2-10 to 2-11 start triggers, 3-15 support, technical, A-1 © National Instruments Corporation NI 660x User Manual...

This manual is also suitable for:

Ni 6601Ni 6602Ni 660 seriesPci-6601

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