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