Product Core Brief
- Model: PCI-6733
- Brand: National Instruments (NI)
- Series: NI 673x High-Speed Analog Output
- Core Function: Delivers simultaneous, multichannel analog updates for control, waveform generation, and stimulus-response testing.
- Product Type: 8-Channel High-Speed Analog Output Device
- Key Specs: 8 AO Channels | 16-Bit Resolution | 1 MS/s Update Rate | RTSI Bus Sync
- Condition: New Original (New Surplus)
Product Introduction
The is a high-speed analog output device designed for applications requiring precise, simultaneous multichannel waveform generation and control. Engineered for stimulus-response tests (such as acoustic distortion testing) and simulation (like three-phase power simulation), it can replace standalone PID controllers, low-speed arbitrary waveform generators, and function generators.
At its core, the features 8 analog output channels, each capable of a 1 MS/s update rate with 16-bit resolution. It also includes 8 digital I/O lines and two 24-bit, 20 MHz counter/timers for versatile system integration. A key feature is its RTSI (Real-Time System Integration) bus, which allows hardware-level synchronization with other NI data acquisition, motion control, and vision products, ensuring nanosecond-level timing precision across your entire test system.
NI PCI-6733
Key Technical Specifications
| Parameter | Value |
|---|---|
| Module Type | High-Speed Analog Output Device |
| Bus Interface | PCI |
| Analog Output Channels | 8 (Simultaneous) |
| Resolution | 16-Bit |
| Max Update Rate | 1 MS/s per channel |
| Digital I/O | 8 Lines (5V TTL/CMOS) |
| Counters/Timers | 2x 24-bit, 20 MHz |
| Synchronization | RTSI Bus (Hardware-Timed) |
| Triggering | Digital Trigger, External Clocking |
| Software Support | NI-DAQmx, LabVIEW, CVI, Measurement Studio |
| Certifications | CE, IEC 61010-1 |
Quality Control Process (Engineer’s Perspective)
We don’t just box these and ship them. Here is our actual bench test workflow.
- Incoming Verification: We verify the serial number against NI traceability records. A visual inspection checks for bent pins on the PCI edge connector and ensures the high-density I/O connector is free of damage.
- Live Functional Test: We mount the unit in a live PCI test system. We verify that NI MAX correctly enumerates the device and passes the self-test.
- Analog Output Accuracy Test: Using a precision multimeter and oscilloscope, we verify DC accuracy and AC waveform fidelity (sine, square, sawtooth) across all 8 channels at various update rates.
- RTSI Synchronization Test: We configure the to synchronize with a companion DAQ card via the RTSI bus and verify hardware-timed triggering with an oscilloscope to confirm nanosecond-level alignment.
- Final QC & Packaging: The module is sealed in an anti-static bag with silica gel. A QC sticker showing the test date and technician initials is applied to the exterior.
Replacement Pitfall Guide
Field replacements on legacy PCI systems are unforgiving. Watch out for these traps.
- PCI vs. PCIe Bridge Issues: ❗ Critical. The is a native PCI card. Many modern motherboards use a PCI-to-PCIe bridge chip that can cause compatibility issues, leading to enumeration failures or erratic behavior. If possible, use a motherboard with a native PCI slot or a known-compatible industrial PC.
- Power Rail Requirements: ❗ Critical. This card requires 3.3V, 5V, and 12V power rails from the PCI bus. Some industrial or legacy motherboards may omit one of these rails (often 12V) on certain slots. Verify your motherboard’s PCI slot power specifications before installation.
- Software Configuration: ❗ Critical. The is an analog output only device. Attempting to create an analog input task in NI MAX or LabVIEW will fail. Ensure your software is configured for “Analog Output” tasks.
- RTSI Cable Routing: If using the RTSI bus for synchronization, ensure the ribbon cable is properly seated and not excessively long. Poor RTSI connections are a common source of synchronization failures.
- ESD Damage: The high-speed DACs and RTSI interface are sensitive to electrostatic discharge. Always wear a grounded wrist strap when handling the bare PCB. I’ve seen cards fail self-tests because they were handled without ESD protection.
Keep these in mind and you’ll cut 90% of rework time.
NI PCI-6733
Compatibility Matrix & Benchmarks
Compatibility
- NI → : Direct Replacement – Verify motherboard PCI slot compatibility and power rails.
- NI → PCIe-6735 : Recommended Upgrade – PCIe-6735 is the modern PCIe equivalent with similar specs. Requires PCIe slot and updated driver support.
- NI → PXI-6733 : Form Factor Change – Same core specs, different chassis. Requires PXI chassis migration.
Benchmarks
- Update Rate: 1 MS/s (Verified across all 8 channels)
- Synchronization Skew: < 10 ns (RTSI bus, hardware-timed)
- DC Accuracy: ±0.01% of range (Typical, post-calibration)
