Fluke 2638A/20 Hydra Series III Data Acquisition Unit

Fluke Calibration

Fluke Calibration authorised distributor.

Data Acquisition Unit / Data Logger: 20 universal channels. Includes one relay board (2638A-RLY) and one 2638A-100 connector.

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£ 1,805.00 rrp £ 1,900.00

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(£ 2,166.00 inc VAT.)

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The Fluke Hydra Series III continues the Hydra Series legacy of precision, multi-channel data acquisition. The new Series III improves on Hydra's industry-leading thermocouple accuracy and adds a new dimension to how you collect and view data in a portable system. The 2638A is expandable from 22 to 66 channels of differential analog inputs. A flexible, 22-channel Universal Input Connector lets you connect and disconnect any type of input to any channel, quickly and easily. Selectable inputs include dc voltage, ac voltage, resistance, thermocouple, RTD, thermistor, frequency and dc and ac current.

With DC measurement accuracy of 0.0024 %, basic 0.5 °C thermocouple accuracy, full-color display, easy-to-use menu system and industrial safety ratings put the 2638A in a category of its own as a precision data acquisition system. The dedicated 6.5 digit digital multimeter (DMM) mode provides additional utility and value.

If you need to “zero” a large number of thermocouples to a known reference temperature before starting a temperature profiling or validation test, the 2638A will normalize all readings to your reference channel at the push of a button and store the offsets for reference in a supporting data file.

Power selection: Specify 100 V, 120 V, 220 V, 240 V power when ordering (power settings may be changed by the user).


DC accuracy of 0.0024%.
Thermocouple accuracy of 0.5°C.
Up to 66 universal differential isolated inputs.
On-screen color trend graphing of up to four channels at a time.
Easy-to-use menu system for setup and data management.
Input types: ac V, dc V, ac I, dc I, thermocouple, PRT (2, 3, 4 w), thermistor, resistance (2-4 w), frequency.
Multi-channel real-time data display.
6.5-digit bench DMM function for front-panel inputs.
Monitor function for real-time viewing and charting between scans.
20 on-board math channels.
One-button screen capture of chart or data displays.
45 channels/second basic dc scan rate.
Internal 57,000 scan/setup file memory.
USB flash drive support.
Data security features.
300 V CAT II input safety rated.

Fluke 2638A Specifications:

  • DC Volts range: 100 MV to 300 V.
  • Resolution/Accuracy: 0.1 µV to 1 mV / 0.0024%.
  • AC Volts range: 100 mV to 300 V.
  • Resolution/Accuracy: 0.1 µV to 1 mV / 0.11%.
  • Resistance range: 100 Ω to 100 MΩ.
  • Resolution/Accuracy: 0.1 mΩ to 100 Ω / 0.01%.
  • Frequency range: 20 Hz to 1 MHz.
  • Accuracy: 0.01%.
  • RTD (Pt 100) range: -200 °C.
  • Resolution/Accuracy: 0.001 °C / 0.016 °C.
  • J Thermocouples range: -200 to 1,000.
  • Resolution/Accuracy: 0.01 °C / 0.53 °C.
  • K Thermocouples range: -200 °C to 1,000 °C.
  • Resolution/Accuracy: 0.01 °C / 0.60 °C.
  • T Thermocouples range: -270 °C to 400 °C.
  • Resolution/Accuracy: 0.01 °C / 0.62 °C.
  • Other Thermocouple types: R, S, N, E, B, C, D, G, L, M, U, W.
  • Channel Capacity Analog inputs: 22 to 66 channels; 8 Digital I/O & 6 Alarm Outputs (TTL).
  • Communication: LAN: 10/100 Mb TCPIP DHCP, Remote commands: SCPI command set.
  • Internal memory: 57,000 scans, 1000 setup files.
  • Language menus: English, Chinese, French, German, Japanese, Korean, Portuguese, Russian, Spanish.
  • Dimensions: 150 mm x 285 mm x 385 mm (5.91 in x 11.22 in x 15.16 in).
  • Weight: 6 kg (13.2 lbs).
  • Fluke 2638A warranty: 1 year.


Includes: Fluke 2638A/20 Data Acquisition Unit / Data Logger: 20 universal channels. Includes one relay board (2638A-RLY) and one 2638A-100 connector.

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Fluke 2638A/20 Hydra Series III Data Acquisition Unit