DATAQ Instruments is excited to announce the pending availability of our model DI-2008 USB data acquisition (DAQ) instrument, slated for March, 2017. This new instrument offers affordable and expandable measurement flexibility with full analog channel isolation that’s so critical for successful measurements in any situation. Follow along and learn why this low-cost data acquisition system supplies the performance of products many times its price.
DI-2008 Quick-look Overview
- Includes: DI-2008 instrument, WinDaq software, calibration cert, terminal screwdriver, USB
- Eight differential and isolated analog inputs (input-to-output and channel-to-channel)
- Seven bi-directional digital input ports, including:
- One counter input for totalizing applications
- One rate input for frequency/flow/rpm applications
- ChannelStretch™ channel expansion to 128 analog and 112 digital channels
- Programmable voltage and thermocouple measurements per channel
- 10 mV to 50 V programmable range per channel in 12 steps
- Programmable support for type J,K,T,B,R,S,E,N thermocouples per channel
- High resolution (16-bit) measurements
- 2000 Hz sample throughput for a single channel and 200 Hz for two or more channels
- USB interface
- Included WinDaq software for ready-to-run measurements
- Included .NET class
- Fully documented device protocol supports other operating systems
DI-2008 Analog Subsystem
Eight analog input channels adapt to a wide range of measurement types and applications. Each channel is independently programmed for a thermocouple or voltage measurement. Programmed as a voltage channel you can select one of twelve measurement ranges from ±10 mV to ±50 V. A range of ±5 V supports 4-20 mA measurements using typically a 250 Ω shunt resistor (model R250 sold separately.) Programmed as a thermocouple channel you can select from eight thermocouple types: J, K, T, B, R, S, E, N.
Linearization and cold junction compensation are automatically applied by the DI-2008 for the selected TC type to deliver values scaled in either °C or °F. Rounding out the DI-2008, a built-in 15 V sensor excitation power supply simplifies external wiring and further reduces overall system cost. Finally, all analog measurements benefit from a high resolution, 16-bit ADC to reveal even the smallest signal variations.
Virtually any measurement will experience a difference in ground potential between the instrument, the signal source, and even between signal sources. Known as common mode voltages, they cause noisy measurements in the best case or damage to the instrument in the worst case unless it’s specifically designed to tolerate them like the DI-2008. Each DI-2008 analog input is electrically isolated from other channels and from ground for safe and accurate measurements in the presence of common mode voltages. Channel isolation means that each analog input is free to float to an independent common mode voltage imposed upon it by the signal source up to 120 V rms, and still provide an accurate and noise-free measurement.
Digital and Pulse Subsystem
The DI-2008 provides 7 digital ports, each configurable as an input or a switch. Input protection is provided to 30 V. Configured as a switch a digital port is used to control external loads up to 30 V @ 100 mA, and the switch
is controlled asynchronously without interrupting the scanning process. When activated as inputs two ports allow dual functionality as discrete inputs, or one as a counter and the other a 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 acquire synchronously, which allows meaningful comparisons between analog and digital channels. For example, the rate input measuring engine speed allows rpm data to be acquired synchronously with analog data.
Supports ChannelStretch™ Channel Expansion
Need more than eight analog channels or seven digital ports?
Just add another DI-2008. In fact, add as many as 15 additional units for a total of 128 analog channels and 112 digital ports. Multiple DI-2008s connected to the same USB hub automatically synchronize to within 10 μS between units, and the maximum sample rate throughput of each instrument is preserved. If you need more USB ports to accommodate more DI-2008 units, simply cascade multiple hubs to expand USB port count. Best of all, when using WinDaq software the enabled channels of all synced units flow into the same WinDaq application. They’re displayed and recorded together as though they were all acquired from a single instrument.
More DI-2008 Information
There’s much more information, including pricing, available for the DI-2008 from the product’s web page at this link:
The instrument is CE-approved and should ship before the end of March, 2017.