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330-668-1444Model DI-245
Four-channel USB High-Common Mode, Low Cross Talk, Voltage and Thermocouple DAQ
Why is high common mode important?
Stock
- Includes a DI-245 instrument, a 6-foot USB cable, a screwdriver for signal connections, an NIST-traceable calibration certificate, and downloadable WinDaq software
- Four differential and isolated analog input channels
- Programmable voltage and thermocouple measurements per channel
- 10 mV to 50 V in 12 steps
- Support for type J, K, T, B, R, S, E, N thermocouples
- Sample rate of 2000 Hz for a single channel and 200 Hz throughput for two or more channels
- USB interface
- Included WinDaq software for ready-to-run measurements
- Fully documented protocol supports other operating systems
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Description
DI-245 USB Thermocouple Data Acquisition system with Windaq software. Features 4 analog input channels programmable as a thermocouple or voltage input, 16-bit measurement resolution, and a full scale range of ±10mV to ±50V for voltage measurements or Thermocouple types J, K, T, B, R, S, E, or N.
Model DI-245 is a low-cost data acquisition system that offers the performance of products many times its price. Four analog input chan-nels adapt to a wide range of measurement types and applications. Each channel can be programmed to make a thermocouple or voltage measurement. Programmed as a voltage channel you can select one of twelve measurement ranges supporting full scale values from ±10 mV to ±50 V. Programmed as a thermocouple channel you can select from eight thermocouple types: J,K,T,B,R,S,E,N.
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, these potential differences will cause noisy measurements in the best case or dam-age to the instrument in the worst case unless it’s specifically designed to tolerate them. Each analog input of the DI-245 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, and still provide an accurate and noise-free measurement.
Accessories
Description
Ferrite choke reduces interference for USB-based data acquisition products.
Description
250 Ω ±0.1% Precision, Metal Film, 1/2W, Axial Resistor
Exceptionally low noise; typically 0.10 μV/V
Low voltage coefficient to ±5 ppm/V
Flame retardant coating. RoHS
compliant. Learn More
Description
Pressure sensor measures PSI ranges of 0-30 up to 0-500 PSI dependant on model. Requires seperate 5V power supply. Made with 316 stainless steel and high temperature auto-graded plastic. 2% Accuracy. 0.5V – 4.5V linear voltage output.
Description
2000361-HX 4-20mA Output High precision pressure sensor measures PSI ranges of -14.5 to 10000 PSI dependant on model. 8-30V supply voltagle, such as a car battery. Made with 316 stainless steel and high temperature auto-graded plastic. 0.5% accuracy. 4-20mA linear current output. 10% Educational Discount
J, K and T Thermocouple Wires
Teflon® coated or High Temp Glassbraisd J, K and T Thermocouple Wires in various length
50-500mm Thermowells
8mm diameter, 50-500mm length, 1/2" MNTP, stainless thermowells with cable gland to protect your thermocouples
Description
Re-calibration Service, this calibration certificate is included with new instruments. NIST-traceable certificate for model DI-245 Thermocouple and Voltage data acquisition product. Includes before and after data. Shipping charges do apply when ordering online. Learn more about Calibrating your device.
Software
WinDaq
Data Acquisition Recording and Playback Software
Included FREE with your DI-245 purchase. Record all channels at 2,000 S/s for a single analog channel or 200 S/s throughput rate for more than one analog channel. Installs drivers and WinDaq recording and playback software.
Drivers
Drivers only Download
Installs drivers for all contemporary data acquisition hardware products that support WinDaq software.
WinDaq/XL
WinDaq-to-Excel Real Time Link
Real-time data logging directly to Microsoft Excel (supports MS Office 2003 or higher). No programming required. Free Trial Version. Purchase full version on WinDaq/XL product page.
WinDaq Add-ons and Utilities
Library
Library of add-on packages for WinDaq Software, such as live XY plot, FFT, Spectrogram, Meter, Gauge, Alarm, etc.
DATAQ SDK .Net
Solutions for .NET Programming Environments
FREE .Net control communicates directly with your DATAQ Instruments device using any .Net programming language. Detailed sample programs included. Fully documented help file. Requires .NET Version 4
Python Example Programs
Available on GitHub
FREE Python example programs using the fully documented device protocol. All sample programs are well-commented to help you get up and running quickly.
MATLAB Example Program
Program in Protocol Level
Learn how to program with MATLAB® in protocol level. Does not require MathWorks' Data Acquisition Toolbox.
Specifications
| Analog Inputs | ||||||||||||||||||||||||||||
| Number of Channels: | 4 | |||||||||||||||||||||||||||
| Configuration: | Differential, Isolated | |||||||||||||||||||||||||||
| Programmable measurements per channel: | Voltage, Thermocouple | |||||||||||||||||||||||||||
| Programmable thermocouple types and measurement range per channel: Over 25 ±5 °C ambient temperature range. Stable ambient temperature. Following 30 minutes warm-up. Excluding common mode error. Excluding thermocouple error. |
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| Programmable voltage measurement ranges per channel: | ±10 mV, ±25 mV, ±50 mV, ±100 mV, ±250 mV, ±500 mV, ±1 V, ±2.5 V, ±5 V, ±10 V, ±25 V, ±50 V | |||||||||||||||||||||||||||
| Voltage measurement accuracy: At 25 °C ambient temperature. Following 30 minutes warm-up. Excluding common mode error. |
±(0.05% of range + 10 µV) | |||||||||||||||||||||||||||
| Input impedance: | 1 MΩ, all ranges | |||||||||||||||||||||||||||
| Isolation: | 350Vpp, Input-to-output, Channel-to-channel | |||||||||||||||||||||||||||
| Absolute maximum input without damage: | 120 V rms | |||||||||||||||||||||||||||
| Maximum common mode voltage: | 120 V rms | |||||||||||||||||||||||||||
| Min common mode rejection (330Ω unbalance): | >100 dB (DC to 60 Hz) | |||||||||||||||||||||||||||
| Channel-to-channel crosstalk rejection: (Rsource ≤ 330 Ω; Freqsource ≤ 60 Hz) | > 100 dB at any throughput | |||||||||||||||||||||||||||
| Digital Inputs | ||||||||||||||||||||||||||||
| Number of channels: | 2 | |||||||||||||||||||||||||||
| Pull-up value: | 4.7 KΩ | |||||||||||||||||||||||||||
| Isolation: | None | |||||||||||||||||||||||||||
| Input high voltage threshold: | 1.80 V minimum | |||||||||||||||||||||||||||
| Input low voltage threshold: | 1.40 V maximum | |||||||||||||||||||||||||||
| Absolute max input without damage: | ±30 V peak | |||||||||||||||||||||||||||
| Power | ||||||||||||||||||||||||||||
| Power Consumption: | 0.75 Watts (from USB port) | |||||||||||||||||||||||||||
| ADC Characteristics | ||||||||||||||||||||||||||||
| Voltage Measurement Resolution: |
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| Thermocouple Temperature Measurement Resolution: |
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| 4-20 mA current loop resolution (5 VFS range with 250-Ω shunt resistor): | 6553 ADC counts over the 4-20 mA range | |||||||||||||||||||||||||||
| Maximum sample throughput rate: | Single enabled channel: 2,000 S/s Two or more enabled channels: 200 S/s |
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| Minimum sample throughput (hardware): | 3.58423 S/s with a single enabled channel 0.358423 S/s with two or more enabled channels |
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| Minimum sample throughput (using WinDaq): | 0.709 samples per hour | |||||||||||||||||||||||||||
| Sample rate timing accuracy: | 50 ppm | |||||||||||||||||||||||||||
| Indicators and Connections | ||||||||||||||||||||||||||||
| Interface: | USB 2.0 (mini-B style connector) | |||||||||||||||||||||||||||
| Indicator lights: | 3 LEDs: Power, Active, Event | |||||||||||||||||||||||||||
| Input Connections: | One 16-position terminal strips | |||||||||||||||||||||||||||
| Pushbutton: | Manual event when used with WinDaq software | |||||||||||||||||||||||||||
| Environmental | ||||||||||||||||||||||||||||
| Operating Temperature: | 0 to 70 °C | |||||||||||||||||||||||||||
| Storage Temperature: | -20 to 70 °C | |||||||||||||||||||||||||||
| Storage Humidity: | 0 to 90% non-condensing | |||||||||||||||||||||||||||
| Physical Characteristics | ||||||||||||||||||||||||||||
| Enclosure: | Hardened Plastic | |||||||||||||||||||||||||||
| Mounting: | Desktop; bulkhead | |||||||||||||||||||||||||||
| Dimensions: | 2.625D × 5.5W × 1.53H in. (6.67D × 13.97W × 3.89H cm.) | |||||||||||||||||||||||||||
| Weight: | 4 oz. (114 grams) | |||||||||||||||||||||||||||
| Software Support | ||||||||||||||||||||||||||||
| WinDaq software: | OS support | |||||||||||||||||||||||||||
| Programming: | Instrument protocol, ActiveX Control | |||||||||||||||||||||||||||
Articles
Making Parallel Thermocouple Measurements
How To Use Protocol-level Commands
Sub-zero Thermocouple Measurements
Why You Need Channel-to-Channel Isolation
How To Calculate Common Mode Rejection Ratio
4-20 mA Measurement Resolution
Frequency and True RMS Data Acquisition
Intelligent Oversampling Methods Extend Measurement Flexibility
4-20mA Current Loop Data Acquisition
Common DI-245 Installation Problems and Resolutions
Videos
Common Mode Rejection
This video demonstrates the ability of the DI-245 to reject common mode voltage. Very impressive!
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Quick Product Comparison
| Model (DI-) |
Analog channels |
Measurement Range |
Expansion with other models (DI-) |
Max Sample Rate (Hz) |
Low-pass Filter |
ADC Resolution |
Digital I/O |
Stand-alone Capability |
Counter Channel |
Rate Channel |
| 1100 | 4 | ±10 V | - | 40,000 | - | 12 | 2 In | - | - | - |
| 2108 | 4 or 8 | ±10 V | - | 160,000 | Yes | 12-14 | 7 Bi | Yes | Yes | Yes |
| 2108-P | 4 or 8 | B† | 2108-P | 160,000 | Yes | 16 | 7 Bi | Yes | Yes | Yes |
| 4108 | 4 or 8 | C† | 4108, 4208, 4718B, 4730 | 160,000 | Yes | 12-16 | 7 Bi | Yes | Yes | Yes |
| 4208 | 4 or 8 | A† | 4208, 4108, 4730, 4718B | 160,000 | Yes | 12-16 | 7 Bi | Yes | Yes | Yes |
*Expand with ChannelStretch™. Compatibility with other units dependent on model.
†Use the following chart to determine Measurement Ranges:
| A | B | C |
| ±2 V ±5 V ±10 V ±20 V ±50 V ±100 V |
±2.5 V ±5 V ±10 V 0-5 V 0-10 V |
±200 mV ±500 mV ±1 V ±2 V ±5 V ±10 V |