ADLINK USB-2405 Dynamic Signal Acquisition Module Deployment Guide

ADLINK USB-2405 24 bit Dynamic Signal Acquisition Module Application and Debugging Manual

In the fields of vibration analysis, acoustic measurement, structural health monitoring, and rotating machinery fault diagnosis, high-resolution and low-noise dynamic signal acquisition modules are the core front-end for obtaining real physical quantities. ADLINK USB-2405 is a 24 bit ∑ - Δ dynamic signal acquisition module powered by USB 2.0 bus, providing 4 synchronous sampling analog inputs, with a maximum sampling rate of 128 kS/s per channel, and built-in IEPE excitation source (2mA constant current), which can be directly connected to accelerometers and microphones. Its flexible triggering mode, programmable functional I/O, and complete self calibration capability make it an ideal choice for portable testing systems. This article systematically outlines the engineering application points of this module from hardware characteristics, signal conditioning, trigger configuration, software deployment to typical fault handling.

Product positioning and core advantages

USB-2405 is designed specifically for dynamic signal measurement that requires high dynamic range and low distortion, mainly targeting:

Vibration monitoring and order tracking of rotating machinery;

Environmental noise and sound quality analysis;

Structural modal testing (impact response);

Automotive NVH (Noise, Vibration, and Smoothness) test.

Its core advantages include:

4-channel synchronous sampling: no phase delay between channels, ensuring multi-channel signal correlation;

24 bit resolution: dynamic range up to 100dB (@ 1kHz, -60dBFS input), effectively capturing weak signals;

Built in anti aliasing filter: combining digital filters with analog RC filters to suppress out of band noise;

IEPE incentive source: Each channel has an independent 2mA constant current source, supports AC coupling, and is suitable for piezoelectric sensors;

Bus power supply: only required 400mA@5V No need for external power supply, excellent portability;

Multi functional bracket: supports desktop, DIN rail, and wall mounted installation, suitable for on-site layout.

Electrical specifications and precision indicators

2.1 Analog Input

Number of channels: 4 differential/pseudo differential (software configuration);

ADC type: 24 bit ∑ - Δ, built-in digital filter;

Input range: ± 10V (fixed), data format is binary complement code;

Input impedance: 200k Ω between positive and negative input terminals, 16.93k Ω between negative input terminal and ground;

Coupling method: AC or DC, software optional (AC cut-off frequency -3dB about 0.4Hz);

Sampling rate: High resolution mode (1k~52.734kHz) or high-speed mode (52.734kHz~128kHz), finely adjusted through DDS, with a resolution of 0.0003Hz;

FIFO: 8k sampling points (shared by all channels).

2.2 DC accuracy (typical at 25 ℃)

Offset error: ± 0.15mV (typical), ± 0.3mV (maximum);

Gain error: ± 0.15% (typical), ± 0.3% (maximum).

2.3 Dynamic performance (typical values)

THD+N (1kHz, 8.9Vpk differential input): -91dB;

CMRR（20Hz~1kHz）：60dB；

Crosstalk (1kHz): -102dB;

System noise (high-resolution mode): 50 μ Vrms;

Bandwidth: Approximately 0.49 x sampling rate at -3dB (e.g. bandwidth of approximately 25kHz at 51.2kS/s);

Passband flatness (20Hz~20kHz): ± 0.01dB.

2.4 Programmable Functional I/O (GPIO)

Two channels of 3.3V/TTL compatible single ended I/O;

Can be configured as static digital input/output, frequency counter (maximum 4MHz), PWM output (maximum 4MHz), digital trigger input, synchronous sampling clock input (maximum 128kHz);

Overvoltage protection: -2V~+7V.

Hardware installation and device identification

3.1 Unpacking and Connection

The package includes: USB-2405 module, multifunctional bracket, 2-meter USB cable, DIN rail installation kit, quick guide, and software CD.

Before first use, the driver (UD-DASK 1.2.2.0627 or above or DAQPilot 2.6.1.0628 or above) must be installed before connecting the USB cable. After the module is powered on, the firmware loads for about 6 seconds, and the LED indicator light changes from amber to green, indicating readiness. If the LED does not turn green, it may indicate insufficient power supply to the USB port (requiring 400mA). It is recommended to use a USB hub with built-in power supply or a rear port on the motherboard.

3.2 Device ID Setting

There is a rotary switch (0-7) on the back of the module for setting the device ID. When multiple modules of the same model are connected to the same PC, different IDs must be set, otherwise the drivers cannot be distinguished. The ID value is read during driver initialization and can be obtained through the API.

3.3 Installation method

The multifunctional bracket supports three types of fixation:

Desktop: Module card in bracket, providing cable management space at the bottom;

DIN rail: With the matching rail buckle, it can be quickly installed in the control cabinet;

Wall mounted: There are 4 mounting holes with a diameter of 3.4mm on the back of the bracket, which are fixed with flat head screws.

Detailed explanation of analog input signal conditioning

4.1 Front end configuration (see Figure 3-2)

Differential/pseudo differential selection: Differential mode is suitable for grounded reference signal sources and can suppress common mode noise; The pseudo differential mode is suitable for floating signal sources (such as uninsulated sensors), where the negative input terminal is connected to the local ground through a 20k Ω resistor to provide a reference potential.