USB-6423 Theory of Operation

NI Signal Streaming

NI signal streaming technology performs the USB communication. NI signal streaming technology allows for efficient, high-speed, bidirectional data streaming to and from the host computer. NI signal streaming uses USB bandwidth efficiently to support data transfer from the different analog input, analog output, and digital I/O subsystems on the USB-6423.

Analog Input

The USB-6423 analog input provides 32 single-ended or 16 differential input channels. The maximum input range of ±10 V is suitable for connection to a wide variety of electronics or sensors with conditioned outputs. A programmable gain instrumentation amplifier with four different ranges delivers a scaled signal to the 16-bit ADC to maximize resolution for lower voltage signals.

An accurate, low-drift onboard reference plus integrated self-calibration circuitry ensures accurate performance across time and temperature.

Analog Output

The analog output circuitry consists of four independent 16-bit, ±10 V analog outputs. You can use these outputs for stimulus or simple control. You can also make single-point updates or generate waveforms.

Digital I/O, Counters, and Timers

The USB-6423 has 16 digital I/O lines. You can configure each line individually as input or output. You can use the digital I/O lines for either single-point updates or high-speed waveform input/output.

The USB-6423 also has four 32-bit counters that you can route to the digital I/O lines. These counters can count events, measure frequency, measure using an incremental encoder, generate frequency, generate a pulse train, and more.

Flexible routing allows you to route any counter to any of the digital I/O lines.

Timing, Triggering, and Synchronization

Independent timing engines control how each device subsystem operates. This functionality allows the subsystems to either run independently or synchronously.

You can route timing and trigger signals to or from the digital I/O lines to synchronize with other equipment or DAQ devices. The timing and trigger signals include signals such as a Start Trigger to control when an operation starts or a Sample Clock, which toggles each time a sample is acquired.

Enclosure and Connectivity

All this functionality is housed in a rugged metal enclosure. You can use the enclosure as-is on a desk or mount it to equipment with built-in zip-tie mounting slots. Optional DIN rail, wall-mount, and rack-mount kits are available for mounting in other environments.

I/O connections are made through removable spring-terminal connectors. These connector blocks use push-in technology that enables you to wire of input signals rapidly. You can use the included backshells to protect the wiring and provide strain relief.