DI-245 Hardware Manual
Introduction
1
1. Introduction
This manual contains information designed to familiarize you with the features and functions of the DI-245 USB mil-
livolt, volt, and thermocouple data acquisition system.
Features
The
DI-245
data acquisition instrument is a portable data recording module that communicates through your com-
puter's USB port. Power is derived from the USB port so no external power is required. Features include:
•
4 fixed differential analog inputs protected to ±150V (transient) programmable as voltage or thermocouple
inputs.
•
±50V full scale measurement range.
•
12 programmable gain ranges per channel (±10, 25, 50, 100, 250, 500 mV; ±1, 2.5, 5, 10, 25, 50 V).
•
Thermocouple types J, K, T, B, R, S, E, and N are supported
•
Two dedicated digital inputs for W
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remote control operations (remote start/stop and remote events).
•
Sample throughput rates up to 2 kHz maximum (for a single channel - 200 Hz with multiple channels) and as low
as 0.709 samples per hour.
•
A push-button to tag insert event markers in W
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software.
•
Three status LEDs for easy notification of system status.
Analog Inputs
The DI-245 features four differential channel inputs located on the sixteen-position screw terminal blocks for easy
connection and operation (other terminals used for digital inputs). Each channel can be programmed to acquire data
as Voltage (ranges: ±10, 25, 50, 100, 250, 500 mV; ±1, 2.5, 5, 10, 25, 50 V) or Thermocouple temperature (types J,
K, T, B, R, S, E, and N are supported).
Utilize the functionality of W
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software to experience all the features encased in these small, inexpensive
instruments.
Digital Inputs
The DI-245 contains two digital lines (bits) for W
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remote control operations (Evnt/DI0 and Rcrd/DI1). Con-
nect switch closures or discrete levels with a maximum input of 30V and a threshold of 1.8V. The inputs float at 1
level, about 3.3V relative to the “-” terminal, and require sinking about 50uA to bring them down to 0.8V and guaran-
tee a 0.
Software
All software required to record and playback waveforms is included with the purchase of any DI-245 data acquisition
system via download.
W
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Recording and Playback Software
W
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Acquisition and W
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Waveform Browser allow you to record and play back data acquired through
your instrument. W
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software is an invaluable resource to record and analyze your data and is available for free
from our web site (www.dataq.com).