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National Instruments PCI-1200 Analog Output Polarity, Analog Input Polarity, Analog Input Mode

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Chapter 2 Installation and Configuration

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

Analog Output Polarity

The PCI-1200 has two channels of analog output voltage at the

I/Oconnector. You can configure each analog output channel for either

unipolar or bipolar output. A unipolar configuration has a range of

0to 10 V at the analog output. A bipolar configuration has a range of

–5to +5 V at the analog output. In addition, you can select the coding

scheme for each D/A converter (DAC) as either two’s complement or

straight binary. If you select a bipolar range for a DAC, the two’s

complement coding is recommended. In this mode, data values written

tothe analog output channel range from F800 hex (–2,048 decimal) to

7FFhex (2,047 decimal). If you select a unipolar range for a DAC, the

straight binary coding is recommended. In this mode, data values written

tothe analog output channel range from 0 to FFF hex (4,095 decimal).

Analog Input Polarity

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

(0to 10 V) or a bipolar range (–5 to +5 V). In addition, you can select the

coding scheme for analog input as either two’s complement or straight

binary. If you select a bipolar range, the two’s complement coding is

recommended. In this mode, –5V input corresponds to F800 hex

(–2,048decimal) and +5 V corresponds to 7FFhex (2,047 decimal). If you

select a unipolar mode, the straight binary coding is recommended. In this

mode, 0V input corresponds to 0 hex, and +10 V corresponds to FFF hex

(4,095 decimal).

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. Table2-2 describes these

configurations.

Contents

Main Page Important Information Warranty Copyright Trademarks WARNING REGARDING MEDICAL AND CLINICAL 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 Customer Communication Introduction About the PCI-1200 What You Need to Get Started Unpacking Software Programming Choices National Instruments Application Software NI-DAQ Driver Software Register-Level Programming Optional Equipment Custom Cabling Page Installation and Configuration Software Installation Hardware Installation Board Configuration Analog I/O Configuration Analog Output Polarity Analog Input Polarity Analog Input Mode RSE Input (Eight Channels, Reset Condition) NRSE Input (Eight Channels) DIFF Input (Four Channels) Signal Connections I/O Connector Figure 3-1. PCI-1200 I/O Connector Pin Assignments Signal Connection Descriptions Page Page Analog Input Signal Connections Page Types of Signal Sources Floating Signal Sources Ground-Referenced Signal Sources Input Configurations Chapter 3 Signal Connections Table 3-4. Summary of Analog Input Connections Differential Connection Considerations (DIFF Configuration) Differential Connections for Grounded Signal Sources Figure 3-3. Differential Input Connections for G rounded 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 Logical Inputs and Outputs Port C Pin Connections Power Connections DAQ and General Purpose Timing Signal Connections DAQ Timing Connections Page Page Page General Purpose Timing Signal Connections Page Page Chapter 3 Signal Connections PCI-1200 User Manual 3-26 National Instruments Corporation Figure 3-16. General Purpose Timing Signals The GATE and OUT signals in Figure3-16 are referenced to the rising edge of the CLK signal. Timing Specifications Mode 1 Input Timing Mode 1 Output Timing Mode 2 Bidirectional Timing National Instruments Corporation 4-1 PCI-1200 User Manual Theory of Operation This chapter explains the operation of each functional unit of the PCI-1200. Functional Overview The block diagram in Figure4-1 shows a functional overview of the PCI-1200 board. Figure 4-1. PCI-1200 Block Diagram PCI Interface Circuitry Timing Chapter 4 Theory of Operation PCI-1200 User Manual 4-4 National Instruments Corporation Figure 4-3. Timing Circuitry Chapter 4 Theory of Operation National Instruments Corporation 4-5 PCI-1200 User Manual Analog Input Figure 4-4. Analog Input Circuitry Analog Input Circuitry DAQ Operations Controlled Acquisition Mode Freerun Acquisition Mode Interval Scanning Acquisition Mode Single-Channel Data Acquisition Multichannel Scanned Data Acquisition DAQ Rates Analog Output Analog Output Circuitry DAC Timing Digital I/O Page Calibration Calibration at Higher Gains Calibration Equipment Requirements Using the Calibration Function A Specifications Analog Input Input Characteristics Transfer Characteristics Amplifier Characteristics Dynamic Characteristics Stability Explanation of Analog Input Specifications Explanation of Dither Explanation of DAQ Rates Analog Output Output Characteristics Transfer Characteristics Voltage Output Dynamic Characteristics Stability Explanation of Analog Output Specifications Digital I/O Timing I/O Page B Customer Communication Electronic Services Bulletin Board Support FTP Support Fax-on-Demand Support Telephone and Fax Support Country Telephone Fax Technical Support Form Page PCI-1200 Hardware and Software Configuration Form National Instruments Products Other Products Page Documentation Comment Form Title: Edition Date: Part Number: Mail to: Technical Publications Fax to: Technical Publications Glossary Numbers/Symbols A C D E Page L M N O P R S T V W Index A B C D E F G I L M N O R S T U V W