Fluke 2640A NetDAQ Networked Data Acquisition Unit

The Fluke 2640A NetDAQ is a networked data acquisition unit that combines universal analog inputs, digital I/O, and thermocouple measurement capability in a single distributed system. It acquires data from multiple sensor types simultaneously and transmits results across Ethernet networks, enabling remote monitoring and control across industrial and laboratory environments. Expandable to 400 channels using up to twenty units in networked configuration.

Technical Specifications

Channel Capacity

Analog Inputs: 20, expandable to 400 across networked systems

Computed Channels: 10 (addition, subtraction, multiplication, division, logarithm, exponentiation, square root, absolute value, integer function, average)

Digital I/O & Alarm Outputs: 8 total

Totalizer: 1

Measurement Ranges & Accuracy

DC Volts: 90 mV to 300 V, resolution 0.3 µV to 1 mV, ±0.01% accuracy (3-Sigma) AC Volts: 300 mV to 300 V, resolution 10 µV to 10 mV, ±0.3% accuracy (3-Sigma) Resistance: 300 Ω to 10 MΩ, resolution 300 mΩ to 3 MΩ, ±0.015% accuracy (3-Sigma) Frequency: 15 Hz to 1 MHz, resolution 0.01 Hz to 100 Hz, ±0.05% accuracy (3-Sigma) Temperature (Pt 100 RTD): −200 to 600 °C, resolution 0.003 °C, ±0.06 °C accuracy (3-Sigma) Temperature (J Thermocouple): −100 to 760 °C Current: 4–20 mA loops

Performance

Data acquisition rate: up to 1,000 readings/second system capacity; 2640A model delivers 100 measurements/second with 5½ digit resolution and 0.02% accuracy

Slow Scan: 6 readings/second

Medium Scan: 41–48 readings/second (50/60 Hz)

Fast Scan: 143 readings/second

A/D Converter: multi-slope type, 18-bit linear resolution to 0.3 µV and 0.02 °C

Common Mode Rejection: ≥120 dB (AC and DC)

Normal Mode Rejection: 50 dB @ 50/60 Hz

Maximum Common Mode Voltage: 300 VDC/VAC rms (Channels 1 & 11); 150 VDC/VAC rms (all others)

Key Features

Universal Input Module accepts any combination of input types without external signal conditioning

Ethernet (IEEE 802.3, 10Base2/10BaseT, TCP/IP) for remote access and control

Multi-range capability with automatic range selection

Typical Applications

Multi-point temperature and voltage monitoring in distributed environments

Industrial process data logging and control systems

Laboratory measurement networks requiring high precision and expandability