PXI-6704 National Instruments

Description

Product name： PXI-6704  National Instruments Power module
Product details:

The NI PXI-6704 is a static analog output module designed for use in PXI systems. It’s primarily used for applications requiring precise, software-timed voltage and current outputs.

Product Details

The NI PXI-6704 is a 16-bit, 32-channel analog output module. It’s a “static” device, meaning its outputs are updated by software commands rather than having a continuous, high-speed update rate. This makes it suitable for control applications where stable, set-point outputs are required. It also includes eight 5 V TTL/CMOS digital I/O lines.

Product Parameters (Specifications)

Here are key specifications for the NI PXI-6704:

• Analog Output Channels: 32 (16 voltage outputs, 16 current outputs)
• Analog Output Resolution: 16 bits
• Maximum Update Rate: Static (software-timed)
• Analog Output Voltage Range: -10.1 V to 10.1 V (independently settable per channel)
• Output Current Range: 0.1 mA to 20.2 mA (independently settable per channel, sources current only)
• Digital I/O Lines: 8 (5 V TTL/CMOS)
• Bus Connector: PXI Hybrid
• I/O Connector: 68-pin male SCSI II shielded connector
• Voltage Output Accuracy: Typically $\pm$1 mV
• Current Output Accuracy: Typically $\pm$2 µA
• Operating Temperature Range: 0°C to 55°C
• Recommended Warm-up Time: 15 minutes

Product Advantages

• High Channel Count: With 32 analog output channels, it offers ample connectivity for complex systems.
• Flexible Output Types: Provides both voltage and current outputs, allowing for a wide range of control applications.
• Independent Channel Control: Each analog output channel can be independently set for its voltage or current range, offering great flexibility.
• Integrated Digital I/O: The inclusion of 8 digital I/O lines adds versatility for basic control or status monitoring within the same module.
• PXI Platform Benefits: As a PXI module, it benefits from the PXI platform’s robust, modular, and synchronized architecture, ideal for automated test and measurement.
• Software-Timed Control: Optimized for applications where precise, stable DC setpoints are needed, rather than high-speed waveform generation.

Important Considerations (Precautions)

• Static Output: The PXI-6704 is a static analog output device. It is not designed for high-speed waveform generation or continuous, high-frequency updates. If your application requires dynamic, high-speed analog signals, you would need a different type of analog output module.
• Current Sourcing Only: The current outputs on the PXI-6704 only source current and do not sink current.
• Power Consumption: Ensure your PXI chassis can provide sufficient power for the module, although the PXI-6704 does not use power from the -12 V rail.
• Cabling and Connectivity: Use appropriate shielded 68-pin SCSI II cables and connector blocks (e.g., TBX-68, SCB-68A) to ensure signal integrity and proper operation, especially in noisy environments.
• Calibration: Regular calibration is important to maintain the specified accuracy of the outputs.
• Overload Protection: While the device has short-circuit protection for voltage outputs and short-circuit/open-circuit protection for current outputs, exceeding the specified current drive for voltage channels (e.g., trying to draw more than 10 mA) can cause internal fuses to open.

Product Applications

The NI PXI-6704 is well-suited for a variety of applications requiring stable and precise DC voltage or current outputs, including:

• Process Control and Automation: Providing setpoint signals to control valves, actuators, heaters, or other industrial equipment.
• Automated Test Equipment (ATE): Generating bias voltages or currents for testing electronic components, sensors, or circuits.
• Sensor Emulation: Simulating sensor outputs for system validation and testing without needing physical sensors.
• Device Characterization: Applying precise voltage or current levels to characterize the performance of semiconductor devices, power supplies, or other electronic systems.
• Laboratory Automation: Driving various lab instruments or experimental setups that require stable analog control signals.
• Calibration and Metrology: As a stable source for calibrating other measurement devices.

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