DI-2108 Data Logger

High-speed, 16-bit USB Data Acquisition (DAQ) with Anti-alias filters

About the DI-2108 Data Logger

Analog Subsystem:
Model DI-2108 delivers premium analog performance at a surprisingly affordable price. Eight analog input channels provide differential measurement flexibility and a ±10 V full scale range. The differential input configuration provides noise rejection, easily adapts to single-ended signal sources, and is protected up to ±100 V dc or peak ac so that inevitable measurement mishaps will not harm the instrument. The front-end feeds a flexible resolution analog-to-digital converter that ranges from 12 to 16 bits as a function of sampling rate. Lower sampling rates deliver higher resolution readings. The maximum sampling throughput rate of the DI-2108 is 220 kHz, providing 12 bits of resolution. Rounding off the analog subsystem are anti-alias filters per channel with automatic selection of corner frequency at ap¬proximately one tenth of the sampling frequency. Finally, an external trigger input allows A-D conversion to be synchronized to external events.

Digital Port Subsystem:
The DI-2108 provides 7 digital ports, each configurable as an input or a switch. Input protection is provided to 30 V. When activated as inputs two ports allow dual functionality as discrete inputs, or programmed as a counter or rate input. The rate input features a 50 kHz maximum measurement allocated over twelve programmable measurement ranges (10 Hz to 50 kHz full scale.) The counter input provides 16-bit resolution and a terminal count value of 65,535. The discrete, counter, and rate inputs are members of the same internal scan list used by the analog input channels. This means that all enabled elements are acquired synchronously, which allows meaningful comparisons between analog and digital channels. For example, the rate input measuring engine speed allows rpm data to be acquired in lock-step with analog data. Configured as a switch a digital port can be used to control external loads up to 30 V @ 100 mA, and the switch can be controlled asynchronously without interfering with the scanning process.

Packaging and Controls:
We’ve released the DI-2108 in a new, sleek, low-profile package to allow it to fit in almost any location. Rubber feet on the bottom of the case prevent it from sliding around in your workspace. A multi-color LED conveys device status at a glance, and a side-mounted pushbut¬ton provides manual event marking capability when used with WinDaq software.

Key features DI-2108

  • Eight armored analog differential inputs Up to ±100 V without damage
  • 80 dB common mode rejection
  • Fixed measurement range of ±10 V full scale
  • Adaptable anti-alias filter per channel Corner frequency set as a function of sampling rate
  • Up to 16-bit analog-to-digital resolution
  • Up to 220 kHz sample throughput rate
  • Seven digital ports Programmable per port as input or switch
  • Support for rate measurements to 50 kHz
  • Support for 16-bit counter
  • External trigger input
  • Software support includes: Ready-to-run WinDaq software
  • Published protocol for software development in all operating systems




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