NI 9229 - User Manual

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Summary

Software

Documentation

Lists and describes documents related to NI 9229/9239 and NI-DAQmx software.

Test Equipment

Lists the recommended equipment for performance verification and adjustment procedures.

Test Conditions

Specifies the required setup and environmental conditions for accurate measurements.

Initial Setup

Outlines the steps required to set up the NI 9229/9239 for calibration.

Verification Procedures

Describes procedures to verify the performance of the NI 9229/9239.

Accuracy Verification

Procedure to determine the As-Found status of the NI 9229/9239 accuracy.

Gain Matching Verification

Procedure to determine the As-Found status of NI 9229/9239 channel-to-channel gain.

Phase Matching Verification

Procedure to determine the As-Found status of NI 9229/9239 channel-to-channel phase.

Adjustment Procedures

Describes the sequence of operations required to adjust the NI 9229/9239.

Accuracy Adjustment

Procedure to adjust the accuracy performance of the NI 9229/9239.

EEPROM Update

Details the process for updating the NI 9229/9239 internal calibration memory.

Reverification

Repeat the Verification section to determine the As-Left status of the device.

Accuracy Under Calibration Conditions

Lists calibration specifications valid under specific environmental and setup conditions.

Worldwide Support and Services

Provides resources for technical support, repairs, and product registration.

Summary

Software

Documentation

Lists and describes documents related to NI 9229/9239 and NI-DAQmx software.

Test Equipment

Lists the recommended equipment for performance verification and adjustment procedures.

Test Conditions

Specifies the required setup and environmental conditions for accurate measurements.

Initial Setup

Outlines the steps required to set up the NI 9229/9239 for calibration.

Verification Procedures

Describes procedures to verify the performance of the NI 9229/9239.

Accuracy Verification

Procedure to determine the As-Found status of the NI 9229/9239 accuracy.

Gain Matching Verification

Procedure to determine the As-Found status of NI 9229/9239 channel-to-channel gain.

Phase Matching Verification

Procedure to determine the As-Found status of NI 9229/9239 channel-to-channel phase.

Adjustment Procedures

Describes the sequence of operations required to adjust the NI 9229/9239.

Accuracy Adjustment

Procedure to adjust the accuracy performance of the NI 9229/9239.

EEPROM Update

Details the process for updating the NI 9229/9239 internal calibration memory.

Reverification

Repeat the Verification section to determine the As-Left status of the device.

Accuracy Under Calibration Conditions

Lists calibration specifications valid under specific environmental and setup conditions.

Worldwide Support and Services

Provides resources for technical support, repairs, and product registration.

The NI 9229/9239 are 4-channel, 24-bit simultaneous, channel-to-channel isolated analog input modules, designed to handle voltage inputs of ±60 V (NI 9229) or ±10 V (NI 9239). These modules are integral components for data acquisition systems, particularly when high-precision, isolated measurements are required. They are compatible with NI cDAQ-9174/9178 USB Chassis and are designed to work seamlessly within the National Instruments ecosystem, leveraging NI-DAQmx driver software for configuration and operation.

Function Description:

The primary function of the NI 9229/9239 modules is to acquire analog voltage signals with high resolution and accuracy. Their 24-bit resolution allows for very fine measurement granularity, making them suitable for applications demanding precise data capture. The simultaneous sampling capability across all four channels ensures that all measurements are taken at the exact same instant, which is crucial for analyzing correlated signals without phase distortion. Channel-to-channel isolation provides electrical separation between individual input channels and the system ground, preventing ground loops and common-mode noise from affecting measurements, thereby enhancing signal integrity and safety. This isolation is particularly beneficial in industrial environments where large common-mode voltages or noisy signals are prevalent. The modules support differential input configurations, which further improves noise rejection by measuring the voltage difference between two points, effectively canceling out common-mode noise present on both lines.

Important Technical Specifications:

Channels: 4 analog input channels.
Resolution: 24 bits, providing high precision for acquired data.
Input Ranges:
- NI 9229: ±60 V
- NI 9239: ±10 V
Sampling: Simultaneous sampling across all channels.
Isolation: Channel-to-channel isolation, ensuring electrical separation and noise immunity.
Input Configuration: Differential.
Driver Software: Requires NI-DAQmx 9.5 or later for operation and calibration.
Compatibility: Designed for use with NI cDAQ-9174/9178 USB Chassis.
Accuracy Under Calibration Conditions:
- Gain Error: ±0.04% for both NI 9229 and NI 9239.
- Offset Error: ±7.66 mV for NI 9229, ±1.35 mV for NI 9239.
Timing Configuration for Accuracy Verification:
- Sample Mode: Finite Samples
- Samples Per Channel: 2000
- Rate: 8330 samples/second
Timing Configuration for Gain/Phase Matching Verification:
- Sample Mode: Finite Samples
- Samples Per Channel: 25000
- Rate: 50000 samples/second
Gain Matching Channel-to-Channel Limit:
- ±0.22 dB
Phase Matching Channel-to-Channel Limits:
- NI 9229: ±0.045° (1 kHz), ±0.900° (20 kHz)
- NI 9239: ±0.075° (1 kHz), ±1.500° (20 kHz)

Usage Features:

The NI 9229/9239 modules are designed for ease of integration into existing or new test and measurement systems.

Software Integration: Full support through NI-DAQmx, which provides APIs for LabVIEW, LabWindows/CVI, ANSI C, Microsoft Visual C++, Microsoft Visual Basic .NET, and Microsoft Visual C#. This broad language support allows developers to choose their preferred programming environment.
Hardware Setup: Simple installation into slot 8 of an NI cDAQ-9178 chassis, with recommendations to leave slots 1 through 7 empty for optimal performance. Connections are made via screw terminals or BNC connectors, depending on the module variant, with specific guidance on using shielded copper wire and twisted-pair wires for noise reduction.
Self-Test Functionality: Users can perform a self-test via Measurements & Automation Explorer (MAX) to ensure the device is functioning correctly before deployment.
Documentation: Comprehensive documentation is available online at ni.com and through help files installed with the software, covering operating instructions, specifications, and calibration intervals.
Application Versatility: Suitable for a wide range of applications requiring high-accuracy voltage measurements, such as industrial process monitoring, sensor interfacing, power quality analysis, and general-purpose data acquisition in electrically noisy environments.

Maintenance Features:

Maintaining the accuracy and performance of the NI 9229/9239 modules involves regular calibration and adherence to specified environmental conditions.

Calibration Procedure: A detailed calibration procedure is provided, including steps for accuracy verification, gain matching verification, and phase matching verification. This allows users to determine the "As-Found" status of the device and ensure it meets published specifications.
Adjustment Procedure: If verification reveals the module is outside its specified limits, an adjustment procedure is available to restore its accuracy. This involves connecting to a high-precision calibrator (e.g., Fluke 5700A) and using specific NI-DAQmx functions to update the internal calibration memory (EEPROM).
EEPROM Update: After an adjustment, the module's internal calibration memory is automatically updated, ensuring that the new calibration data is stored persistently. Users can also update the calibration date and onboard temperature without making adjustments if desired.
Reverification: Post-adjustment, a reverification step is recommended to confirm the "As-Left" status of the device, ensuring that the adjustment was successful and the module now meets its specifications.
Environmental Conditions: Specific test conditions are outlined for calibration and verification, including ambient temperature (23 °C ± 5 °C), relative humidity (below 80%), and a warm-up time of at least 10 minutes to ensure stable operating temperature.
Support and Services: National Instruments provides extensive worldwide support and services, including technical support, factory installation services, repairs, extended warranty, and access to calibration certificates and declarations of conformity. This ensures users have resources for troubleshooting, maintenance, and compliance.
Obsolete Hardware Support: Apex Waves explicitly states that they stock new, new surplus, refurbished, and reconditioned NI hardware, including the NI 9229, indicating a commitment to supporting legacy test systems and providing parts for older NI series devices. This is a crucial feature for users with long-term deployments of NI equipment.