Fluke 2638A Hydra Series III Data Acquisition System/Digital M

The Fluke 2638A Hydra Series III is a multi-channel data acquisition system and 6.5-digit digital multimeter engineered for precision measurement and logging in industrial and laboratory settings. It combines universal differential analog inputs - expandable from 22 to 66 channels - with dedicated DMM functionality, delivering 0.0024% DC accuracy and 0.5 °C thermocouple accuracy. The instrument supports temperature profiling, process monitoring, environmental testing, and product validation through its diverse input types and 45 channels/second scan rate.

Technical Specifications

• DC Measurement Accuracy: 0.0024%


• Thermocouple Accuracy: 0.5 °C basic accuracy


• Channel Capacity: Expandable from 22 to 66 universal differential isolated inputs across three rear panel slots


• Input Types: DC voltage, AC voltage (300 V rms / 425 V peak front panel; 150 V CAT II / 250 V peak rear inputs), 2-wire and 4-wire resistance, thermocouples (15 types: R, S, N, E, B, C, D, G, L, M, U, W, J, K, T), RTD (2-, 3-, 4-wire), thermistor, frequency (20 Hz to 1 MHz), DC current, and AC current (0.2% or reading + 5 counts at ±20.99 mA; 1% or reading + 5 counts at ±21.0 to ±99.9 mA)


• AC Current Maximum Conductor Diameter: 0.177 in (4.5 mm)


• Scan Rate: 45 channels/second (DC)


• Digital Multimeter: Front-panel jacks; 6.5-digit precision engine supporting voltage, resistance, AC/DC modes, frequency, and temperature measurement

Key Features

• On-board memory stores over 57,000 scan/setup files


• USB flash drive support for extended data collection


• 20 on-board math channels


• Full-color display with intuitive menu navigation


• Dual-level security with administrator, five user, and guest access levels


• Industrial safety ratings

Typical Applications Process monitoring, environmental testing, product validation, temperature profiling.

Compatibility & Integration USB flash drive connectivity enables direct file transfer and storage management between internal memory and external drives.