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National Instruments DAQCard-1200 Analog Input Configuration, Analog Input Polarity

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Chapter 2 Installation and Configuration

© National Instruments Corporation 2-3 DAQCard-1200 User Manual

If you are using LabWindows/CVI, the software installation instructions

are in Part 1, Introduction to LabWindows/CVI, of the Getting Started with

LabWindows/CVI manual. After you have installed LabWindows/CVI,

refer to Chapter 1, Configuring LabWindows/CVI, of the LabWindows/CVI

User Manual for software configuration instructions. Then follow

DAQconfiguration instructions in your NI-DAQ user manual.

Analog Input Configuration

At startup, the DAQCard-1200 defaults to the following configuration:

• Referenced single-ended input mode

• ±5 V analog input range

Table2-1 lists the available analog I/O configurations for the

DAQCard-1200 and shows the default settings.

The analog input circuitry is software configurable.

Warning Connections, including power signals to ground and vice versa, that exceed any of

the maximum signal ratings on the DAQCard-1200 can damage your card and

computer. National Instruments is NOT liable for any damages or injuries resulting

from incorrect signal connections.

Analog Input Polarity

You can select the analog input on the DAQCard-1200 for either a unipolar

range (0 to 10 V) or a bipolar range (–5 to +5 V). If you select a bipolar

range, the two’s complement coding is selected. In this mode, –5 V input

corresponds to F800 hex (–2,048 decimal) and +5 V corresponds to

7FFhex (2,047 decimal). If you select a unipolar mode, the straight binary

coding is selected. In this mode, 0 V input corresponds to 0 hex, and +10 V

corresponds to FFF hex (4,095 decimal).

Table 2-1. Analog I/O Settings

Parameter Configuration

Analog Input

Polarity Bipolar—±5 V (default setting)

Unipolar—0–10 V

Analog Input Mode Referenced single-ended (RSE) (default setting)

Non-referenced single-ended (NRSE)

Differential (DIFF)

Contents

Main Page Important Information Warranty Copyright Trademarks WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS Contents Chapter 4 Theory of Operation Page Tables About This Manual Organization of This Manual Conventions Used in This Manual National Instruments Documentation Related Documentation Introduction About the DAQCard-1200 What You Need to Get Started Software Programming Choices LabVIEW and LabWindows/CVI Application Software NI-DAQ Driver Software Register-Level Programming Optional Equipment Unpacking Installation and Configuration Installation Configuration Analog Input Configuration Analog Input Polarity Analog Input Mode RSE Input (Eight Channels, Default Setting) NRSE Input (Eight Channels) DIFF Input (Four Channels) Analog Output Configuration Analog Output Polarity Digital I/O Configuration Counter Configuration Signal Connections I/O Connector Figure 3-1. DAQCard-1200 I/O Connector Pin Assignments Signal Connection Descriptions Analog Input Signal Connections + Types of Signal Sources Floating Signal Sources Ground-Referenced Signal Sources Input Configurations Differential Connection Considerations (DIFF Configuration) Differential Connections for Grounded Signal Sources Figure 3-3. Differential Input Connections for Grounded Signal Sources Differential Connections for Floating Signal Sources Figure 3-4. Differential Input Connections for Floating Sources Single-Ended Connection Considerations Single-Ended Connections for Floating Signal Sources (RSE Configuration) Single-Ended Connections for Grounded Signal Sources (NRSE Configuration) Common-Mode Signal Rejection Considerations Analog Output Signal Connections Digital I/O Signal Connections Page Port C Pin Connections Timing Specifications Mode 1 Input Timing Mode 1 Output Timing Mode 2 Bidirectional Timing Page DAQ and General-Purpose Timing Signal Connections DAQ Timing Connections Page Page Page General-Purpose Timing Signal Connections Page Page Figure 3-18. Frequency Measurement Application Chapter 3 Signal Connections DAQCard-1200 User Manual 3-30 National Instruments Corporation Figure 3-19. General-Purpose Timing Signals The GATE and OUT signals in Figure3-19 are referenced to the rising edge of the CLK signal. Power Connections National Instruments Corporation 4-1 DAQCard-1200 User Manual Theory of Operation This chapter explains the operation of each functional unit of the DAQCard-1200. Figure 4-1. DAQCard-1200 Block Diagram Functional Overview The block diagram in Figure 4-1 shows a functional overview of the DAQCard-1200. PC Card I/O Channel Interface Circuitry Timing Chapter 4 Theory of Operation Figure 4-3. Timing Circuitry DAQCard-1200 User Manual 4-4 National Instruments Corporation Analog Input Analog Input Circuitry Page Data Acquisition Timing Data Acquisition Operation Continuous Data Acquisition Interval Data Acquisition Data Acquisition Rates Page Analog Output Analog Output Circuitry Power-On State DAC Timing Digital I/O Calibration Calibration at Higher Gains Calibration Equipment Requirements Using the Calibration Function Page A Specifications Analog Input Input Characteristics Transfer Characteristics Amplifier Characteristics Dynamic Characteristics Stability Analog Output Output Characteristics Transfer Characteristics Page Timing I/O Digital Trigger Bus Interface Power Requirement Physical Page B Differences among the Lab-PC+, the DAQPad-1200, and the DAQCard-1200 Page C Power-Management Modes Page D PC Card Questions and Answers Configuration Operation Resources Page Page E Technical Support Resources NI Web Support Online Problem-Solving and Diagnostic Resources Software-Related Resources Worldwide Support Glossary Numbers/Symbols A B C D E F G Page Page V Index Numbers A B C D E F G I L M N O R S T U V W