DWYEROMEGA / OMEGA OMB-DAQ-56 Personal DAQ USB Data Acquisition Module

The OMB-DAQ-56 is a USB-powered personal data acquisition module engineered for portable signal capture and real-world measurement tasks. Built around a 22-bit A/D converter, It has 20 single-ended and 10 differential analog input channels within a compact form factor. Direct thermocouple measurement with integrated cold junction compensation supports eight industry-standard thermocouple types across temperature ranges from -200°C to +1400°C. Powered exclusively from the USB bus, the module requires no external power supplies and communicates via high-speed USB up to 5 m from the host PC. Scalability is inherent - up to 100 modules cascade through USB hubs to deliver 8000 total measurement channels from a single computer.

Technical Specifications Analog Input

22-bit A/D converter resolution

20 single-ended input channels

10 differential input channels

Programmable voltage ranges: ±31 mV to ±20 V full scale

Input resistance: >10 MΩ (single-ended), >20 MΩ (differential)

Bias current: 120 dB @ 60 Hz

Channel-to-channel crosstalk: <-120 dB (DC to 100 Hz) Thermocouple Measurement

Cold junction compensation accuracy: ±0.5°C

Type J: -100 to 700°C, ±1.1°C

Type K: -200 to 1200°C, ±1.2°C

Type T: -100 to 400°C, ±1.1°C

Type E: -100 to 500°C, ±1.0°C

Type R: -400 to 1400°C, ±2.5°C

Type S: 400 to 1400°C, ±2.6°C

Type B: 700 to 1400°C, ±3.3°C

Type N: -100 to 700°C, ±1.5°C Interface & Power

USB connectivity; bus-powered operation

Optional external supply: 6 to 16 Vdc when using bus-powered hubs

Maximum cable distance: 5 m (16.4 feet)

Multi-module capacity: up to 100 modules per PC, 8000 total channels

Key Features

Doubles the I/O capacity of the OMB-DAQ-55 in identical physical dimensions

Direct thermocouple support eliminates external signal conditioning

High input impedance and low bias current minimize loading effects

Exceptional channel isolation and common-mode rejection

Zero external power infrastructure required

Typical Applications

Industrial temperature monitoring and data logging

Multi-point voltage acquisition and transducer interfacing

Portable environmental and thermal testing

Research instrumentation requiring flexible channel expansion

Field diagnostics and system validation

Compatibility & Integration The module operates as a USB device requiring only driver software and standard hub infrastructure. Cascading up to 100 units through commercial USB hubs eliminates the need for specialized expansion chassis or external power distribution systems.