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General| Model | NI 6251 |
|---|---|
| Analog Input Resolution | 16 bits |
| Sampling Rate | 1.25 MS/s (aggregate) |
| Analog Output Channels | 2 |
| Analog Output Resolution | 16 bits |
| Digital I/O Channels | 24 |
| Maximum Update Rate | 2.86 MS/s |
| Category | Data Acquisition |
| Analog Input Channels | 16 (single-ended) or 8 (differential) |
| Interface | PCI |
| Operating System Compatibility | Windows, Linux |
| Bus Interface | PCI |
| Input Impedance | 10 GΩ |
Provides instructions for installing the NI-DAQmx software package.
Offers non-software-specific guidance for installing DAQ devices and accessories.
Explains the function of DAQ hardware in digitizing signals and performing conversions.
Details the M Series analog input/output calibration circuitry for error correction.
Explains how to program M Series devices using NI-DAQmx driver software.
Describes signals found on the I/O connectors, noting availability varies by device.
Explains input range settings and their effect on device resolution and signal attenuation.
Describes the function of lowpass filters in attenuating frequencies above the cutoff and reducing noise.
Details the analog input ground-reference settings supported by M Series devices.
Explains how to program channels for different ground references using DAQ Assistant or NI-DAQmx C API.
Discusses issues affecting accuracy in multichannel scanning, such as settling time.
Advises using sources with <1 kΩ impedance to ensure fast settling times and accuracy.
Explains how switching between large and small input ranges affects settling time and suggests scan order optimization.
Describes software-timed and hardware-timed acquisition methods, including buffered and non-buffered operations.
Details the three types of analog input triggering: start, reference, and pause triggers.
Summarizes recommended input configurations for different types of signal sources.
Explains how to connect floating signal sources using differential, NRSE, or RSE configurations.
Details how to connect ground-referenced signal sources, emphasizing DIFF connections.
Summarizes the timing signals provided by the analog input timing engine.
Explains how to set the AO range by configuring offset and reference signals.
Covers software-timed and hardware-timed generation methods, including buffered and non-buffered operations.
Details the two types of analog output triggering: start and pause triggers.
Summarizes the timing signals for analog output waveform generation.
Explains using AO Start Trigger to initiate waveform generation.
Describes using AO Pause Trigger to mask off samples in a DAQ sequence.
Details using AO Sample Clock to initiate AO samples and update DAC outputs.
Guides on using M Series devices for analog output applications in software.
Explains how M Series DIO lines can be used as static DI or DO lines for monitoring or control.
Describes triggering DI or DO operations for digital waveform acquisition or generation.
Details acquiring digital waveforms on Port 0 DIO lines using DI waveform acquisition FIFO.
Explains using DI Sample Clock to sample P0.<0..31> terminals and store results in the DI waveform acquisition FIFO.
Covers generating digital waveforms on Port 0 DIO lines using DO waveform generation FIFO.
Explains using DO Sample Clock to update DO terminals with samples from the DO waveform generation FIFO.
Guides on using M Series devices for various digital I/O applications in software.
Describes applications for counters, including counting edges, pulse-width, period, frequency, and position measurements.
Explains counting edges on the Source input after arming, including direction control.
Details how counters measure pulse width on the Gate input signal.
Explains how counters measure the period on the Gate input signal.
Outlines methods for measuring frequency using counters, depending on the application.
Describes using counters for position measurements with quadrature or two-pulse encoders.
Describes measuring the time between edges on two signals using Aux and Gate inputs.
Covers applications for counter outputs, including simple pulse generation and pulse train generation.
Lists the various counter timing signals available on M Series devices.
Details the three counter triggering actions: arm start, start, and pause.
Explains routing external timing signals to various M Series functions using PFI terminals.
Details protection against overvoltage, undervoltage, overcurrent, and ESD events for PFI and DIO signals.
Shows the clock routing circuitry of an M Series device, managing timing and clock signals.
Outlines methods for synchronizing multiple devices using RTSI bus and PXI clock/trigger signals.
Details independent DMA controllers for high-performance data transfers and USB Signal Stream for USB devices.
Describes DMA, IRQ, and programmed I/O for PCI/PCIe/PXI/PXIe devices, and USB Signal Stream for USB devices.
Explains generating triggers on digital signals using PFI, RTSI, or PXI_STAR signals.
Details generating triggers on analog signals using APFI <0..1> terminals or analog input channels.
Outlines configuring analog trigger circuitry for edge triggering, hysteresis, or window triggering.
Describes timing specifications for triggers and clock signals related to the analog input timing engine.
Addresses common analog input issues like crosstalk and ground-reference problems.
Provides online technical support resources, including self-help and free technical support.
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