PCI-6731 4-Channel 16-Bit Analog Output Device
The PCI-6731 is a four-channel, high-speed PCI analog output device designed for applications requiring precise amplitude control and synchronized waveform generation. Its four 16-bit voltage outputs support update rates up to 1 MS/s.
In addition to analog output, the PCI-6731 includes eight 5 V TTL/CMOS digital I/O lines, two 24-bit, 20 MHz counter/timers, digital triggering and external clocking. These resources allow the board to coordinate waveform generation with external instruments, DUT events and automated test sequences.
Key Features of the PCI-6731
- Four analog voltage-output channels
- 16-bit DAC resolution
- Up to 1 MS/s update rate
- Simultaneous multichannel updates
- ±10 V output range
- Eight 5 V TTL/CMOS digital I/O lines
- Two 24-bit, 20 MHz counter/timers
- External clock and digital trigger support
- 68-pin SCSI-type front connector
- PCI plug-in form factor
- NI-DAQmx software support
- Suitable for precision stimulus generation
PCI-6731 Technical Specifications
| Product Model | PCI-6731 |
|---|---|
| Part Number | 778511-01 |
| Product Type | High-speed analog output device |
| Bus Interface | PCI |
| Analog Output Channels | 4 voltage outputs |
| Output Resolution | 16 bits |
| Maximum Update Rate | Up to 1 MS/s |
| Output Range | ±10 V |
| Update Architecture | Hardware-timed simultaneous output |
| Digital I/O | 8 bidirectional 5 V TTL/CMOS lines |
| Counter/Timers | 2 × 24-bit, 20 MHz |
| Triggering | Digital triggering |
| External Clock | Supported |
| Front Connector | 68-pin male SCSI-type connector |
| Software Driver | NI-DAQmx |
PCI-6731 Part Number and Accessories
| Item | Part Number | Description |
|---|---|---|
| PCI-6731 | 778511-01 | Four-channel, 16-bit, 1 MS/s PCI analog output device |
| SH68-68-EPM | 199006 series | Recommended shielded 68-pin cable |
| SCB-68A | 782536-01 | Shielded screw-terminal connection block |
| BNC-2110 | 777643-01 | BNC connectivity accessory for laboratory use |
| TBX-68 | 777141-01 | DIN-rail screw-terminal block |
16-Bit Output Resolution
The PCI-6731 uses 16-bit digital-to-analog conversion, providing finer voltage increments than 12-bit and 13-bit members of the same analog-output family. This improves the ability to reproduce small amplitude changes across the configured output range.
Actual system accuracy also depends on calibration status, temperature, cable resistance, grounding, external noise and the characteristics of the connected load.
Four Synchronized Output Channels
The four analog channels can generate independent waveform data while sharing hardware timing. This is useful for quadrature signals, phase-related stimulus, multiaxis commands and coordinated controller inputs.
A hardware trigger can start generation at a defined system event, while an external clock can align sample updates with other instrumentation.
Buffered Continuous Generation
NI-DAQmx can stream waveform data from computer memory for continuous generation. Regeneration can repeat a stored waveform, while nonregenerative operation allows software to deliver changing waveform blocks during a test.
The host computer, PCI bus and software configuration should be evaluated when sustained high-rate generation is required on several channels.
PCI-6731 Applications
- Precision four-channel waveform generation
- Audio-frequency stimulus generation
- Sensor and actuator simulation
- Closed-loop control development
- Power-electronics command generation
- Hardware-in-the-loop testing
- Automated stimulus-response testing
- Multiphase and quadrature signal generation
- Research instrumentation
- Production functional testing
Precision Device Stimulation
The 16-bit resolution makes the PCI-6731 appropriate when a DUT must be stimulated with small, controlled voltage increments. Engineers can define every waveform sample and coordinate the stimulus with measurement hardware.
Closed-Loop Development
The board can generate analog commands for external actuators, amplifiers or controller inputs. Its counter/timers and digital lines can provide supporting timing and control functions, although an external power stage is required for high-current loads.
PCI-6731 Installation Workflow
Step 1: Review Compatibility
Confirm the presence of a conventional PCI slot and verify that the target operating system is supported by NI-DAQmx.
Step 2: Install the PCI-6731
Shut down the computer, use ESD protection and install the board securely.
Step 3: Configure the Device
Use NI MAX to confirm recognition, assign a device name and run basic diagnostics.
Step 4: Connect the Signals
Install the shielded 68-pin cable and selected terminal block. Confirm AO, AOGND, digital and timing terminal assignments.
Step 5: Perform a Functional Test
Generate a known DC level and a low-frequency waveform before connecting sensitive test hardware.
PCI-6731 Troubleshooting
The output has an unexpected offset
Check calibration status, grounding and the measuring instrument. Allow the device and test system to reach a stable operating temperature.
The waveform frequency is incorrect
Verify the sample-clock rate and number of samples per waveform period. Confirm whether an internal or external clock is selected.
Generation stops during a continuous task
Check for buffer-underflow errors and increase the software buffer or data-writing lead time.
The DUT loads the output
Measure the DUT input impedance. Add an external voltage buffer or amplifier when the load requires more current than the analog output supports.
Channels are not phase aligned
Create all required channels in one NI-DAQmx task and use a shared hardware timing configuration.
PCI-6731 Comparison
| Model | Channels | Resolution | Primary Advantage |
|---|---|---|---|
| PCI-6711 | 4 | 12 bits | Fast four-channel generation |
| PCI-6722 | 8 | 13 bits | Eight-channel 13-bit output |
| PCI-6731 | 4 | 16 bits | Higher-resolution four-channel output |
| PCI-6733 | 8 | 16 bits | Higher resolution and more channels |
The PCI-6731 is the appropriate choice when four analog outputs are sufficient and 16-bit resolution is more important than additional channel count. Choose the PCI-6733 when eight 16-bit channels are required.
PCI-6731 Frequently Asked Questions
What is the PCI-6731?
It is a four-channel, 16-bit PCI analog output device supporting hardware-timed waveform generation at up to 1 MS/s.
Does it support simultaneous output updates?
Yes. The device is designed for synchronized multichannel analog generation.
Can it drive motors directly?
No. An external motor driver or power amplifier is normally required because the board generates control-level voltage signals.
Can the PCI-6731 use external timing?
Yes. It supports external clocking and digital triggering.
What is the PCI-6731 part number?
The standard part number is 778511-01.
Recommended Related Products
- PCI-6711 12-Bit Analog Output Device
- PCI-6733 8-Channel Analog Output Device
- PCI-6722 13-Bit Analog Output Device
- PCIe-6738 Analog Output Device
Request a Quote for the PCI-6731
Contact us for pricing, availability and configuration assistance for the PCI-6731 16-bit analog output device. Compatible cables, terminal blocks and newer replacement options are also available.
