National Instruments DAQCard-1200 C

© National Instruments Corporation C-1 DAQCard-1200 User Manual

C

Power-Management Modes

This appendix describes the power-management modes of the

DAQCard-1200.

• Normal Mode—This is the normal operating mode of the

DAQCard-1200 in which all the circuits are fully functional. This

mode draws about 150 mA from the 5 V supply (about 750 mW).

• Power-Down Mode—In this mode, the digital circuitry is powered on

and is functional. The analog input and output circuits are powered

down by setting the PWRDOWN bit in the PCMCIA Card

Configuration and Status Register. You can set the PWRDOWN bit by

using the DAQPOWER utility that is shipped with NI-DAQ. Use

DAQPOWER-D to power down and DAQPOWER-U to power up the

DAQCard-1200. This utility is also available in Windows and is

installed whenever you install NI-DAQ. Typically, the analog supplies

are not reduced to zero; negligible power is supplied to the analog

circuits. This mode draws about 50 mA from the 5 V supply (about

250mW).

TableC-1 shows the effects of different power-management modes on the

DAQCard-1200 circuits.

Table C-1. DAQCard-1200 Power-Management Modes

Normal Mode Power-Down Mode

Analog

Input Functional. Defaults to bipolar (±5 V)

RSE. Protected to ±35 V.

Impedance > 1 GΩ.

Nonfunctional. Draws negligible power.

Protected to ±25 V. Impedance = 4.7 kΩ,

which is the input protection resistance.

Analog

Output Functional. Defaults to bipolar (±5 V)

RSE. Output of each DAC remains at 0 V

(within 110 ms of card insertion) until

the first update is performed on that

DAC. Short circuit protected to 80 mA.

DC impedance = 0.5 Ω.

Nonfunctional. Draws negligible power.

Output of each DAC is ideally 0 V, but

may get some negligible value. Short

circuit protected to 80 mA. Assume

impedance = 0.5 Ω.

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