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The Unit

Zapisovalnik podatkov DL844

Datalogger DL844 can read up to 8 analog voltages and 4 digital channels. 4 current sources are available for resistive sensor supply. A sigma-delta AD converter with integrated multiplexer is used to convert the analog signals. Data can be time-stamped with internal battery-backed clock and stored to an SD card. FAT formatted data enables simple data readout using a personal computer.

Real-time access to the data is possible over RS-485 bus, whereas USB interface is provided for direct access to the SD card when data logging is inactive. A microcontroller LPC2368 running operating system NTKernel is in charge for control of the unit. Various supply options are available including internal rechargeable battery.

The datalogger is due to its universality useful in many applications. In our laboratory it is also being used for monitoring of our dye sensitized solar cells.

Brochure

User Manual

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Basic specifications

Analog inputs

  • number: 8 single-ended / 4 differencial (any combination possible)
  • scanning rate: up to 1 S/s
  • resolution: 24 bits
  • absolute input range: 0...3 V
  • evaluation: Platinum RTDs, thermocouples

Current source outputs

  • number: 4
  • current: 1 mA (other value on request)

Digital inputs

  • number: 4
  • protocol supported: 1-wire temperature sensors

Output voltages

  • 5 V, 3,3 V: 100 mA / 500 mA
  • reference output: 2,5 V

Data storage

  • medium: SD card up to 2 GB
  • file system: FAT12, FAT16 or FAT32
  • data format: comma separated values (CSV)

Interfaces

  • USB: Mass Storage Access to SD card
  • RS-232
  • RS-485

Power supply

  • external: 10...60 V
  • battery (internal): Li-ion 7.4 V 2.2 Ah (option for external)
  • options: different input voltage range, MPP tracking, charging from USB

Dimensions

  • size: 190 x 140 x 30 mm3
  • weight: 420 g (with Li-ion battery)
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Contacts and inquiry

If you would like more information on GPIB Controller you are invited to our page on Services.