National Instruments DAQ PCI-1200 User Manual
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National Instruments DAQ PCI-1200 User Manual

Daq multifunctional i/o board for pci bus computers
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DAQ
PCI-1200 User Manual
Multifunctional I/O Board for PCI Bus Computers
PCI-1200 User Manual
July 1998 Edition
Part Number 320942C-01

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Summary of Contents for National Instruments DAQ PCI-1200

  • Page 1 PCI-1200 User Manual Multifunctional I/O Board for PCI Bus Computers PCI-1200 User Manual July 1998 Edition Part Number 320942C-01...
  • Page 2 Singapore 2265886, Spain 91 640 0085, Sweden 08 730 49 70, Switzerland 056 200 51 51, Taiwan 02 377 1200, United Kingdom 01635 523545 National Instruments Corporate Headquarters 6504 Bridge Point Parkway Austin, Texas 78730-5039 USA Tel: 512 794 0100 © Copyright 1996, 1998 National Instruments Corporation. All rights reserved.

  • Page 3: Important Information

    90 days from date of shipment, as evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace software media that do not execute programming instructions if National Instruments receives notice of such defects during the warranty period.

  • Page 4: Table Of Contents

    Chapter 1 Introduction About the PCI-1200 .......................1-1 What You Need to Get Started ..................1-1 Unpacking ........................1-2 Software Programming Choices ..................1-2 National Instruments Application Software ............1-2 NI-DAQ Driver Software ................1-3 Register-Level Programming ................1-4 Optional Equipment .......................1-5 Custom Cabling ......................1-5 Chapter 2 Installation and Configuration Software Installation ......................2-1...
  • Page 5 Controlled Acquisition Mode ............4-8 Freerun Acquisition Mode..............4-8 Interval Scanning Acquisition Mode ..........4-8 Single-Channel Data Acquisition ............. 4-9 Multichannel Scanned Data Acquisition .......... 4-9 DAQ Rates ...................... 4-10 Analog Output ....................... 4-11 PCI-1200 User Manual © National Instruments Corporation...
  • Page 6 Pretrigger DAQ Timing.................3-21 Figure 3-12. Interval-Scanning Signal Timing ............3-22 Figure 3-13. EXTUPDATE* Signal Timing for Updating DAC Output ....3-23 Figure 3-14. Event-Counting Application with External Switch Gating ....3-24 Figure 3-15. Frequency Measurement Application ...........3-25 © National Instruments Corporation PCI-1200 User Manual...
  • Page 7 Port C Signal Assignments ..............3-18 Table 3-6. Signal Names Used in Timing Diagrams ..........3-27 Table 4-1. Analog Input Settling Time Versus Gain..........4-10 Table 4-2. PCI-1200 Maximum Recommended DAQ Rates......... 4-10 PCI-1200 User Manual viii © National Instruments Corporation...

  • Page 8: About This Manual

    The PCI-1200 is a low-cost multifunction analog, digital, and timing board. The PCI-1200 is a member of the National Instruments PCI Series of expansion boards for PCI bus computers. These boards are designed for high-performance data acquisition (DAQ) and control for applications in laboratory testing, production testing, and industrial process monitoring and control.

  • Page 9: Conventions Used In This Manual

    Macintosh computers, unless otherwise noted. SCXI SCXI stands for Signal Conditioning eXtensions for Instrumentation and is a National Instruments product line designed to perform front-end signal conditioning for National Instruments plug-in DAQ boards. PCI-1200 User Manual © National Instruments Corporation...

  • Page 10: National Instruments Documentation

    Consult these guides when you are making your connections. • SCXI Chassis Manual—If you are using SCXI, read this manual for maintenance information on the chassis and installation instructions. © National Instruments Corporation PCI-1200 User Manual...

  • Page 11: Related Documentation

    • PCI-1200 Register-Level Programmer Manual This manual is available from National Instruments by request. If you are using NI-DAQ, LabVIEW, LabWindows/CVI, or other application software, you should not need the register-level programmer manual. Using NI-DAQ, LabVIEW, LabWindows/CVI or other application software, is easier than, and as flexible as, using the low-level programming described in the register-level programmer manual.

  • Page 12: Introduction

    ADC; two 12-bit DACs with voltage outputs; 24 lines of TTL-compatible digital I/O; and three 16-bit counter/timers for timing I/O. The PCI-1200 is a member of the National Instruments PCI Series of expansion boards for PCI bus computers. These boards are designed for...

  • Page 13: Unpacking

    • Remove the board from the package and inspect the board for loose components or any other sign of damage. Notify National Instruments if the board appears damaged in any way. Do not install a damaged board into your computer.

  • Page 14: Ni-Daq Driver Software

    An example of a low-level function is writing directly to registers on the DAQ device. NI-DAQ does not sacrifice the performance of National Instruments DAQ devices because it lets multiple devices operate at their peak performance.

  • Page 15: Register-Level Programming

    Even if you are an experienced register-level programmer, consider using NI-DAQ, LabVIEW, LabWindows/CVI or other National Instruments application software to program your National Instruments DAQ hardware. Using the National Instruments application software is easier than, and as flexible as, register-level programming, and can save weeks of development time.

  • Page 16: Optional Equipment

    Chapter 1 Introduction Optional Equipment National Instruments offers a variety of products to use with your PCI-1200 board, including cables, connector blocks, and other accessories, as follows: • Cables and cable assemblies • Connector blocks, 50-pin screw terminals • SCXI modules and accessories for isolating, amplifying, exciting, and multiplexing signals for relays and analog output.
  • Page 17 Chapter 1 Introduction The mating connector for the PCI-1200 is a 50-position, polarized, ribbon socket connector with strain relief. National Instruments uses a polarized (keyed) connector to prevent inadvertent upside-down connection to the PCI-1200. Recommended manufacturer part numbers for this mating connector are as follows: •...

  • Page 18: Installation And Configuration

    Installation and Configuration This chapter describes how to install and configure your PCI-1200. Software Installation If you are using NI-DAQ, or National Instruments application software, refer to the installation instructions in your software documentation to install and configure your software.

  • Page 19: Board Configuration

    Referenced single-ended (RSE) (reset condition) Nonreferenced single-ended (NRSE) Differential (DIFF) Both the analog input and analog output circuitries are software configurable. Refer to your software documentation for more information on changing these settings. PCI-1200 User Manual © National Instruments Corporation...

  • Page 20: Analog Output Polarity

    Analog Input Mode The PCI-1200 has three different input modes—RSE input, NRSE input, and DIFF input. The single-ended input configurations use eight channels. The DIFF input configuration uses four channels. Table 2-2 describes these configurations. © National Instruments Corporation PCI-1200 User Manual...

  • Page 21: Rse Input (Eight Channels, Reset Condition)

    NRSE input means that all input signals are referenced to the same common-mode voltage, which floats with respect to the PCI-1200 analog ground. This common-mode voltage is subsequently subtracted by the input instrumentation amplifier. The NRSE configuration is useful for measuring ground-referenced signal sources. PCI-1200 User Manual © National Instruments Corporation...

  • Page 22: Diff Input (Four Channels)

    Considerations for using the DIFF configuration are discussed in Chapter 3, Signal Connections. Notice that the signal return path is through the amplifier’s negative terminal and through channel 1, 3, 5, or 7, depending on which channel pair you select. © National Instruments Corporation PCI-1200 User Manual...

  • Page 23: Signal Connections

    You should not externally drive digital I/O lines while the computer is powered off; doing so can damage the computer. National Instruments is liable for any damages resulting from signal connections that exceed these maximum ratings.

  • Page 24: Signal Connection Descriptions

    Figure 3-1. PCI-1200 I/O Connector Pin Assignments Signal Connection Descriptions The following table describes the connector pins on the PCI-1200 I/O connector by pin number and gives the signal name and description of each signal connector pin. PCI-1200 User Manual © National Instruments Corporation...

  • Page 25: Table 3-1. Signal Descriptions For Pci-1200 I/O Connector Pins

    C. PC7 is the MSB, and PC0 is the LSB. EXTTRIG DGND External Trigger—External control signal to trigger a DAQ operation. EXTUPDATE* DGND External Update—External control signal to update DAC outputs. © National Instruments Corporation PCI-1200 User Manual...
  • Page 26 The connector pins are grouped into analog input signal pins, analog output signal pins, digital I/O signal pins, timing I/O signal pins, and power connections. The following sections describe the signal connection guidelines for each of these groups. PCI-1200 User Manual © National Instruments Corporation...

  • Page 27: Analog Input Signal Connections

    –250 to 249.877 mV –100 to 99.951 mV –50 to 49.975 mV Table 3-3. Unipolar Analog Input Signal Range Versus Gain Gain Setting Input Signal Range 0 to 9.99756 V 0 to 4.99878 V © National Instruments Corporation PCI-1200 User Manual...

  • Page 28: Figure 3-2. Pci-1200 Instrumentation Amplifier

    All signals must be referenced to ground, either at the source device or at the PCI-1200. If you have a floating source, you must use a ground-referenced input connection at the PCI-1200. If you have a PCI-1200 User Manual © National Instruments Corporation...

  • Page 29: Types Of Signal Sources

    Input Configurations You can configure the PCI-1200 for one of three input modes—RSE, NRSE, or DIFF. The following sections discuss the use of single-ended and differential measurements, and considerations for measuring both floating © National Instruments Corporation PCI-1200 User Manual...

  • Page 30: Table 3-4. Summary Of Analog Input Connections

    See text for information on bias resistors. NOT RECOMMENDED Single-Ended — Ground AIGND Referenced (RSE) Ground-loop losses, V , are added to measured signal Single-Ended — AISENSE AISENSE Nonreferenced (NRSE) AIGND AIGND See text for information on bias resistors. PCI-1200 User Manual © National Instruments Corporation...

  • Page 31: Differential Connection Considerations (Diff Configuration)

    The signal leads travel through noisy environments. Differential signal connections reduce picked-up noise and increase common-mode signal and noise rejection. With these connections, input signals can float within the common-mode limits of the input instrumentation amplifier. © National Instruments Corporation PCI-1200 User Manual...

  • Page 32: Differential Connections For Grounded Signal Sources

    With this type of connection, the instrumentation amplifier rejects both the common-mode noise in the signal and the ground-potential difference between the signal source and the PCI-1200 ground (shown as V Figure 3-3). PCI-1200 User Manual 3-10 © National Instruments Corporation...

  • Page 33: Differential Connections For Floating Signal Sources

    The 100 kΩ resistors shown in Figure 3-4 create a return path to ground for the bias currents of the instrumentation amplifier. If there is no return path, the instrumentation amplifier bias currents charge stray capacitances, © National Instruments Corporation 3-11 PCI-1200 User Manual...

  • Page 34: Single-Ended Connection Considerations

    PCI-1200 provides the reference ground point for the external signal. Use the NRSE configuration for ground-referenced signal sources; in this case, the external signal supplies its own reference ground point and the PCI-1200 should not supply one. PCI-1200 User Manual 3-12 © National Instruments Corporation...

  • Page 35: Single-Ended Connections For Floating Signal Sources (Rse Configuration)

    On the other hand, if the input circuitry of the PCI-1200 is referenced to ground, such as in the © National Instruments Corporation 3-13 PCI-1200 User Manual...

  • Page 36: Common-Mode Signal Rejection Considerations

    PCI-1200. The common-mode input range of the PCI-1200 instrumentation amplifier is the magnitude of the greatest common-mode signal that can be rejected. PCI-1200 User Manual 3-14 © National Instruments Corporation...

  • Page 37: Analog Output Signal Connections

    The following output ranges are available: • Bipolar output ±5 V* • Unipolar output 0 to 10 V* * Maximum load current ±2 mA for 12-bit linearity. © National Instruments Corporation 3-15 PCI-1200 User Manual...

  • Page 38: Digital I/O Signal Connections

    I/O ports. Refer to Appendix A, Specifications, for signal voltage and current specifications. The following specifications and ratings apply to the digital I/O lines. All voltages are with respect to DGND. PCI-1200 User Manual 3-16 © National Instruments Corporation...

  • Page 39: Logical Inputs And Outputs

    In Figure 3-8, port A is configured for digital output, and ports B and C are configured for digital input. Digital input applications include receiving TTL signals and sensing external device states such as the switch in © National Instruments Corporation 3-17 PCI-1200 User Manual...

  • Page 40: Port C Pin Connections

    Do not directly connect this +5 V power pin to analog or digital ground or to any Warning other voltage source on the PCI-1200 or any other device. Doing so can damage the PCI-1200 or your computer. National Instruments is liable for any damage due to incorrect power connections.

  • Page 41: Daq Timing Connections

    When you use EXTCONV* to time sample intervals, data acquisition is enabled on a rising edge of EXTTRIG followed by a rising edge on EXTCONV*. The first conversion occurs on the next falling edge © National Instruments Corporation 3-19 PCI-1200 User Manual...

  • Page 42: Figure 3-10. Posttrigger Daq Timing

    Notice that the sample counter has been programmed to allow five conversions after the rising edge on the EXTTRIG signal. Additional transitions on the EXTTRIG line have no effect until you initiate a new DAQ sequence. PCI-1200 User Manual 3-20 © National Instruments Corporation...

  • Page 43: Figure 3-11. Pretrigger Daq Timing

    EXTCONV*. The GATE signal disables conversions for the rest of the scan interval after the desired channels have been scanned. Refer to the Interval Scanning Acquisition Mode section in Chapter 4, Theory of Operation, for more information on interval scanning. © National Instruments Corporation 3-21 PCI-1200 User Manual...

  • Page 44: Figure 3-12. Interval-Scanning Signal Timing

    EXTUPDATE* line. CNTINT is the signal that interrupts the computer. This interrupt is generated on the rising edge of EXTUPDATE*. DACWRT is the signal that writes a new value to the DAC. PCI-1200 User Manual 3-22 © National Instruments Corporation...

  • Page 45: General Purpose Timing Signal Connections

    You can enable or disable the counting operation by controlling the gate input. Figure 3-14 shows connections for a typical event-counting operation in which a switch is used to gate the counter on and off. © National Instruments Corporation 3-23 PCI-1200 User Manual...

  • Page 46: Figure 3-14. Event-Counting Application With External Switch Gating

    The frequency of the input signal then equals the count value divided by the gate period. Figure 3-15 shows the connections for a frequency measurement application. You can also use a second counter to PCI-1200 User Manual 3-24 © National Instruments Corporation...

  • Page 47: Figure 3-15. Frequency Measurement Application

    – input logic high voltage 2.2 V min 5.3 V max – input logic low voltage –0.3 V min 0.8 V max –10 µA min +10 µA max – Input load current © National Instruments Corporation 3-25 PCI-1200 User Manual...

  • Page 48: Figure 3-16. General Purpose Timing Signals

    400 ns maximum outg Figure 3-16. General Purpose Timing Signals The GATE and OUT signals in Figure 3-16 are referenced to the rising edge of the CLK signal. PCI-1200 User Manual 3-26 © National Instruments Corporation...

  • Page 49: Timing Specifications

    Write Signal—This signal is the write signal generated from the PCI interface circuitry. DATA Bidirectional Data Lines at the Specified Port—This signal indicates when the data on the data lines at a specified port is or should be available. © National Instruments Corporation 3-27 PCI-1200 User Manual...

  • Page 50: Mode 1 Input Timing

    Data after STB* = 1 — RD* = 0 to INTR = 0 — RD* = 1 to IBF = 0 All timing values are in nanoseconds. Figure 3-17. Mode 1 Timing Specifications for Input Transfers PCI-1200 User Manual 3-28 © National Instruments Corporation...

  • Page 51: Mode 1 Output Timing

    ACK* = 0 to OBF* = 1 — ACK* pulse width — ACK* = 1 to INTR = 1 All timing values are in nanoseconds. Figure 3-18. Mode 1 Timing Specifications for Output Transfers © National Instruments Corporation 3-29 PCI-1200 User Manual...

  • Page 52: Mode 2 Bidirectional Timing

    ACK* = 0 to output ACK* = 1 to output float — RD* = 1 to IBF = 0 All timing values are in nanoseconds. Figure 3-19. Mode 2 Timing Specifications for Bidirectional Transfers PCI-1200 User Manual 3-30 © National Instruments Corporation...

  • Page 53: Theory Of Operation

    Timebase Divider Oscillator Figure 4-1. PCI-1200 Block Diagram The major components of the PCI-1200 are as follows: • MITE PCI interface circuitry • Timing circuitry • Analog input circuitry • Analog output circuitry © National Instruments Corporation PCI-1200 User Manual...

  • Page 54: Pci Interface Circuitry

    16-bit, or 32-bit transfers, but the PCI-1200 uses only 8-bit transfers. Data/Address Address Interface Control Data Digital Control Error Reporting Control/Data Control MITE Logic Interface Arbitration Interrupt Chip System Interrupt Figure 4-2. PCI Interface Circuitry PCI-1200 User Manual © National Instruments Corporation...

  • Page 55: Timing

    The PCI-1200 uses two 82C53 counter/timer integrated circuits for internal DAQ and DAC timing and for general purpose I/O timing functions. Figure 4-3 shows a block diagram of both groups of timing circuitry (counter groups A and B). © National Instruments Corporation PCI-1200 User Manual...
  • Page 56 OUT output pin. You can program all six counter/timers to operate in several useful timing modes. The first group of counter/timers is called group A and includes A0, A1, and A2. You can use these three counters for internal DAQ and DAC PCI-1200 User Manual © National Instruments Corporation...

  • Page 57: Analog Input

    Gain Select/ Interrupt Mux Counter ACH1 ACH3 ACH5 ACH7 Dither AISENSE/ Circuitry Dither Enable AIGND Dither Counter/Timer Timing External Trigger Signals EXTTRIG External Convert EXTCONV* External Scan Interval OUTB1 Figure 4-4. Analog Input Circuitry © National Instruments Corporation PCI-1200 User Manual...

  • Page 58: Analog Input Circuitry

    For more information on the effects of dither, see “Dither in Digital Audio” by John Vanderkooy and PCI-1200 User Manual © National Instruments Corporation...

  • Page 59: Daq Operations

    DAQ operations are initiated either externally through EXTTRIG or through software control. The DAQ operation is terminated either internally by counter A1 of the 82C53 (A) counter/timer circuitry, which © National Instruments Corporation PCI-1200 User Manual...

  • Page 60: Controlled Acquisition Mode

    For example, to sample channel 1, wait 12 µs, then sample channel 0; and if you want to PCI-1200 User Manual © National Instruments Corporation...

  • Page 61: Single-Channel Data Acquisition

    … To specify the scan sequence for a multichannel scanned analog input operation, select the start channel for the scan sequence. © National Instruments Corporation PCI-1200 User Manual...

  • Page 62: Daq Rates

    Table 4-2. PCI-1200 Maximum Recommended DAQ Rates Acquisition Mode Gain Rate Single-channel 1, 2, 5, 10, 20, 50, 100 100 kS/s Multichannel 100 kS/s 2, 5, 10 77 kS/s 66.6 kS/s 37 kS/s 16.6 kS/s PCI-1200 User Manual 4-10 © National Instruments Corporation...

  • Page 63: Analog Output

    –5.0000 to +4.9976 V. For unipolar output, 0.0000 V output corresponds to a digital code word of 0. For bipolar output, –5.0000 V output corresponds to a digital code word of F800 hex. One LSB is the © National Instruments Corporation 4-11 PCI-1200 User Manual...

  • Page 64: Dac Timing

    Address PA<0..7> DATA<0..7> PB<0..7> Interface Control Data DIO RD/WRT Digital 82C55A Control PC<0..7> Programmable Error Reporting Control Logic Peripheral MITE Interface Interface Arbitration Interrupt Chip System Interrupt Figure 4-6. Digital I/O Circuitry PCI-1200 User Manual 4-12 © National Instruments Corporation...
  • Page 65 2.5 mA of current and sourcing 2.5 mA of current on each digital I/O line. When the ports are not enabled, the digital I/O lines act as high-impedance inputs. © National Instruments Corporation 4-13 PCI-1200 User Manual...
  • Page 66 There are four different user areas. When the PCI-1200 is powered on, or the conditions under which it is operating change, you must load the calibration DACs with the appropriate calibration constants. © National Instruments Corporation PCI-1200 User Manual...

  • Page 67: Calibration At Higher Gains

    ±0.012% of its input range. For analog input calibration, use a precision DC voltage source, such as a calibrator, with the following specifications. • Voltage 0 to 10 V • Accuracy ±0.001% standard ±0.003% acceptable PCI-1200 User Manual © National Instruments Corporation...

  • Page 68: Using The Calibration Function

    RSE and for bipolar polarity, then configure the analog output circuitry for the polarity at which you want to perform output waveform generation. Refer to your software documentation for more details on the function and the 1200 Calibrate VI. Calibrate_1200 © National Instruments Corporation PCI-1200 User Manual...

  • Page 69: Appendix A Specifications

    ±1 V 0 to 2 V ±500 mV 0 to 1 V ±250 mV 0 to 500 mV ±100 mV 0 to 200 mV ±50 mV 0 to 100 mV Input coupling ........DC © National Instruments Corporation PCI-1200 User Manual...
  • Page 70 Postgain error before calibration ..±200 mV max Gain error (relative to calibration reference) After calibration.......0.02% of reading max Before calibration ......±2% of reading max Amplifier Characteristics Input impedance Normal powered on ......100 GΩ in parallel with 50 pF PCI-1200 User Manual © National Instruments Corporation...
  • Page 71 60 µs typ, 80 µs max System noise (including quantization error) Gain Dither off Dither on 1–50 0.3 LSB rms 0.5 LSB rms 0.5 LSB rms 0.7 LSB rms Stability Recommended warm-up time ....15 min. © National Instruments Corporation PCI-1200 User Manual...
  • Page 72 ±1 LSB of the ideal, one of its edges may be well beyond ±1.5 LSB; thus, the ADC would have a relative accuracy of that amount. National Instruments tests its boards to ensure that they meet all three linearity specifications defined in this appendix.
  • Page 73 ADC as nearly 0 LSB. From the relationship between the mean of the noise and the measured rms magnitude of the noise, the character of the noise can be determined. National Instruments has determined that the character of the noise in the PCI-1200 is fairly Gaussian, so the noise specifications given are the amounts of pure Gaussian noise required to produce our readings.
  • Page 74 After calibration.......±0.01% of reading max Before calibration ......±1% of reading max Voltage Output Ranges ............0 to 10 V, ±5 V, software selectable Output coupling ........DC Output impedance........0.2 Ω typ Current drive ..........±2 mA Protection..........Short circuit to ground PCI-1200 User Manual © National Instruments Corporation...
  • Page 75 Number of channels ....... 24 I/O (three 8-bit ports; uses 82C55A PPI) Compatibility ......... TTL Digital logic levels Level Input low voltage –0.3 V 0.8 V Input high voltage 2.2 V 5.3 V © National Instruments Corporation PCI-1200 User Manual...
  • Page 76 Max source frequency......8 MHz Min source pulse duration ......125 ns Min gate pulse duration ......50 ns Digital logic levels Level Input low voltage –0.3 V 0.8 V Input high voltage 2.2 V 5.3 V PCI-1200 User Manual © National Instruments Corporation...

  • Page 77: Bus Interface

    Dimensions..........17.45 by 10.56 cm (6.87 by 4.16 in.) I/O connector.......... 50-pin male Environment Operating temperature......0° to 50° C Storage temperature ....... –55° to 150° C Relative humidity ........5% to 90% noncondensing © National Instruments Corporation PCI-1200 User Manual...
  • Page 78 Electronic Services Bulletin Board Support National Instruments has BBS and FTP sites dedicated for 24-hour support with a collection of files and documents to answer most common customer questions. From these sites, you can also download the latest instrument drivers, updates, and example programs. For recorded instructions on how to use the bulletin board and FTP services and for BBS automated information, call 512 795 6990.
  • Page 79 Telephone and Fax Support National Instruments has branch offices all over the world. Use the list below to find the technical support number for your country. If there is no National Instruments office in your country, contact the source from which you purchased your software to obtain support.

  • Page 80: Technical Support Form

    National Instruments for technical support helps our applications engineers answer your questions more efficiently. If you are using any National Instruments hardware or software products related to this problem, include the configuration forms from their user manuals. Include additional pages if necessary.
  • Page 82 Complete a new copy of this form each time you revise your software or hardware configuration, and use this form as a reference for your current configuration. Completing this form accurately before contacting National Instruments for technical support helps our applications engineers answer your questions more efficiently.
  • Page 84 Documentation Comment Form National Instruments encourages you to comment on the documentation supplied with our products. This information helps us provide quality products to meet your needs. Title: PCI-1200 User Manual Edition Date: July 1998 Part Number: 320942C-01 Please comment on the completeness, clarity, and organization of the manual.
  • Page 85 < less than – negative of, or minus ≠ not equal to Ω ohms percent ± plus or minus positive of, or plus +5 V +5 Volts signal © National Instruments Corporation PCI-1200 User Manual...
  • Page 86 CLKB1, CLKB2 counter B1, B2 clock signals centimeters CMRR common-mode rejection ratio—a measure of an instrument’s ability to reject interference from a common-mode signal, usually expressed in decibels (dB) CNTINT counter interrupt signal PCI-1200 User Manual © National Instruments Corporation...
  • Page 87 DGND digital ground signal digital input DIFF differential digital input/output direct memory access differential nonlinearity digital output EEPROM electrically erasable programmable read-only memory—ROM that can be erased with an electrical signal and reprogrammed © National Instruments Corporation PCI-1200 User Manual...
  • Page 88 LSB of the worst-case deviation from the ideal A/D or D/A transfer characteristic of the analog I/O circuitry INTR interrupt request signal input/output PCI-1200 User Manual © National Instruments Corporation...
  • Page 89 (NRSE) measurement system reference, but the voltage at this reference can vary with respect to the measurement system ground OBF* output buffer full signal OUTB0, OUTB1 counter B0, B1 output signals OVERFLOW overflow error OVERRUN overrun error © National Instruments Corporation PCI-1200 User Manual...
  • Page 90 Also called a grounded measurement system. seconds PCI-1200 User Manual © National Instruments Corporation...
  • Page 91 © National Instruments Corporation PCI-1200 User Manual...
  • Page 92 (2) a LabVIEW software module (VI), which consists of a front panel user interface and a block diagram program volts, input high volts, input low measured voltage Vrms volts, root-mean-square signal source watts WRT* write signal PCI-1200 User Manual © National Instruments Corporation...
  • Page 93 2-4 settings (table), 2-2 recommended input configurations signal connections. See analog input signal (table), 3-8 connections. single-ended connections for floating specifications, A-1 to A-6 signal sources, 3-13 theory of operation, 4-5 to 4-11 © National Instruments Corporation PCI-1200 User Manual...
  • Page 94 3-14 to 3-15 circuitry, 4-11 to 4-12 ComponentWorks application software, 1-2 DAC timing, 4-12 configuration polarity analog input configuration, 2-3 analog I/O settings (table), 2-2 settings (table), 2-2 input modes, 2-3 to 2-5 PCI-1200 User Manual © National Instruments Corporation...
  • Page 95 DAQ timing connections, 3-19 to 3-23. See dither circuitry also general-purpose timing signal explanation, A-5 connections. theory of operation, 4-6 to 4-7 EXTCONV* signal, 3-19 to 3-21 DNL (differential nonlinearity) EXTCONV* signal timing (figure), 3-19 analog input, A-4 © National Instruments Corporation PCI-1200 User Manual...
  • Page 96 GATE, CLK, and OUT signals (figure), 3-26 fax and telephone support numbers, B-2 ground-referenced signal sources Fax-on-Demand support, B-2 differential connections, 3-10 floating signal sources purpose and use, 3-7 differential connections, 3-11 to 3-12 PCI-1200 User Manual © National Instruments Corporation...
  • Page 97 PC<7..0> signal (table), 3-3 manual. See documentation. PCI interface circuitry mode 1 input timing, 3-28 block diagram, 4-2 mode 1 output timing, 3-29 theory of operation, 4-2 to 4-3 mode 2 bidirectional timing, 3-30 © National Instruments Corporation PCI-1200 User Manual...
  • Page 98 3-15 to 3-16 DAQ and general-purpose timing signal connections DAQ timing connections, RD* signal (table), 3-27 3-19 to 3-23 referenced single-ended mode. See RSE input. general-purpose timing connections, register-level programming, 1-4 3-23 to 3-26 PCI-1200 User Manual © National Instruments Corporation...
  • Page 99 A-9 posttrigger and pretrigger modes, timing I/O, A-8 to A-9 3-19 to 3-20 square wave generation, 3-23 posttrigger timing (figure), 3-20 STB* signal (table), 3-27 pretrigger timing (figure), 3-21 system noise, A-5 © National Instruments Corporation PCI-1200 User Manual...
  • Page 100 2 bidirectional timing, 3-30 trigger, digital, A-9 unipolar signal range vs. gain (table), 3-5 to 3-6 unpacking the PCI-1200, 1-2 VirtualBench application software, 1-3 waveform generation timing sequence, 3-22 to 3-23 WRT* signal (table), 3-27 PCI-1200 User Manual © National Instruments Corporation...

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