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NATIONAL INSTRUMENTS NI-9203

NI-9203 C Series Current Input Module User Manual

NATIONAL INSTRUMENTS

1. Product Overview

The NI-9203 is an 8-channel, ±20 mA, 16-bit analog input module designed for current measurements in industrial and scientific applications. It features 250 Vrms CAT II channel-to-earth isolation and operates within a temperature range of -40 °C to 70 °C. This module is part of the C Series, offering robust and reliable data acquisition capabilities.

Front view of the NI-9203 C Series Current Input Module

Figure 1: Front view of the NI-9203 module, showing the 8-channel input terminals (AI0-AI7, COM) and key specifications such as 8-Ch ±20 mA 16-Bit Analog Input and 250 Vrms CAT II Ch-to-Earth Isolation. The module also displays operating temperature range and various compliance markings.

Side view of the NI-9203 module showing the connector block

Figure 2: Side view of the NI-9203 module, highlighting the removable screw-terminal connector block. This block provides secure connections for the input channels and common ground, with clearly labeled pin numbers 0 through 9.

2. Setup and Installation

Proper installation is crucial for the reliable operation of the NI-9203 module. Follow these steps carefully:

  1. Power Off System: Ensure the CompactDAQ or CompactRIO chassis is powered off before inserting or removing any modules.
  2. Module Insertion: Align the NI-9203 module with an available slot in the chassis. Gently push the module until it clicks into place.
  3. Secure Latch: Press the module's latch down to secure it firmly in the chassis.
  4. Wiring Connections: Connect your current input signals to the screw-terminal connector. Refer to the pinout diagram on the module for correct wiring.
    • Connect current sources to AI0 through AI7.
    • Connect the common return path to the COM terminal.
  5. Power On System: Once all modules are securely installed and wired, power on the chassis.
Top view of the NI-9203 module showing the latch mechanism

Figure 3: Top view of the NI-9203 module, illustrating the latch mechanism used to secure the module within a CompactDAQ or CompactRIO chassis. This latch ensures a stable and reliable connection.

3. Operating Instructions

The NI-9203 module is designed to acquire current signals. Operation typically involves configuring the module through National Instruments software, such as LabVIEW or NI-DAQmx.

3.1. Software Configuration

  1. Install Drivers: Ensure NI-DAQmx drivers are installed on your host computer.
  2. Detect Device: Open NI Measurement & Automation Explorer (MAX) to verify the module is detected and recognized by the system.
  3. Create Task: In MAX or your programming environment (e.g., LabVIEW), create a new DAQmx task for analog input.
  4. Configure Channels: Add the NI-9203's analog input channels (ai0 to ai7) to the task. Specify the measurement type as current and set the input range to ±20 mA.
  5. Timing and Triggering: Configure the sampling rate and any necessary triggering parameters for your application.
  6. Start Acquisition: Run the DAQmx task to begin acquiring data from the current input module.

3.2. Data Acquisition

The NI-9203 converts analog current signals into digital data. The 16-bit resolution provides precise measurements. Ensure your current sources are within the ±20 mA range to prevent saturation or damage to the module.

4. Maintenance

The NI-9203 module is designed for robust industrial use and requires minimal maintenance. However, periodic checks can ensure optimal performance and longevity.

5. Troubleshooting

If you encounter issues with your NI-9203 module, refer to the following common troubleshooting steps:

ProblemPossible CauseSolution
Module not detected in NI MAX
  • Module not fully seated
  • Chassis not powered on
  • Driver issues
  • Ensure module is securely latched.
  • Verify chassis power.
  • Reinstall NI-DAQmx drivers.
Incorrect or no readings
  • Incorrect wiring
  • Input signal out of range
  • Software configuration error
  • Check wiring against pinout diagram.
  • Verify input current is within ±20 mA.
  • Review DAQmx task settings (e.g., range, channel type).
Module LED indicators not behaving as expected
  • Power issue
  • Module fault
  • Check chassis power supply.
  • Refer to NI documentation for specific LED behavior.
  • Try reseating the module.

6. Specifications

Key technical specifications for the NI-9203 C Series Current Input Module:

Bottom view of the NI-9203 module with product information

Figure 4: Bottom view of the NI-9203 module, displaying manufacturing details, serial number, and country of origin (Product of Hungary). This section also includes various regulatory compliance markings.

Rear view of the NI-9203 module showing National Instruments branding

Figure 5: Rear view of the NI-9203 module, featuring the "NATIONAL INSTRUMENTS" branding and logo. This side typically faces the chassis backplane when installed.

7. Warranty and Support

For warranty information and technical support, please refer to the official National Instruments website or contact their customer service directly. Keep your purchase receipt and module serial number handy when seeking support.