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Model DI-245

Four-channel USB High-Common Mode, Low Cross Talk, Voltage and Thermocouple DAQ

Why is high common mode important?

  • 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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DI-245 Thermocouple DAQ
This data acquisition unit features four analog inputsThis data acquisition system has two digital inputs
This data logger has a USB interfaceThis data acquisition system has a 30-day Money back guaranteeThis data logger is manufactured in the United States of America


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.



USB Ferrite Choke

Ferrite Choke


Ferrite choke reduces interference for USB-based data acquisition products.


4-20mA Current Loop Shunt Resistor

$ 2.99
R250 Shunt Resistor


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


Standard Pressure Sensors

Pressure Sensor


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.


4-20mA Output High Accuracy Pressure Sensors

Pressure Sensor


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.

J, K and T Thermocouple Wires

Teflon® coated 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



Calibration Certificate

NIST Calibration Certificate


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.



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.

WinDaq Data Acquisition Software


Drivers only Download

Installs drivers for all contemporary data acquisition hardware products that support WinDaq software.

Starter Kit Drivers


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 Data Acquisition Software

WinDaq Add-ons and Utilities


Library of add-on packages for WinDaq Software, such as live XY plot, FFT, Spectrogram, Meter, Gauge, Alarm, etc.

WinDaq Data Acquisition Add-on Software


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.

DATAQ Python Example Programs

MATLAB Example Program

Program in Protocol Level

Learn how to program with MATLAB® in protocol level. Does not require MathWorks' Data Acquisition Toolbox.



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.
Thermocouple Type Temperature Measurement Range (°C) Accuracy (°C)
J -190 to 1200 ±(0.1% of span + 2)
K -180 to 1360 ±(0.1% of span + 2)
T -190 to 400 ±(0.1% of span + 1)
B 600 to 1000
1001 to 1810
±(0.2% of span + 4)
±(0.1% of span + 3)
R -40 to 300
301 to 1760
±(0.2% of span + 6)
±(0.1% of span + 3)
S -40 to 400
401 to 1750
±(0.2% of span + 6)
±(0.1% of span +3)
E -160 to 990 ±(0.1% of span + 1)
N -170 to 50
51 to 1290
±(0.1% of span + 3)
±(0.1% of span + 1)
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 Consumption: 0.75 Watts (from USB port)
ADC Characteristics
Voltage Measurement Resolution:
Range Resolution
±10 mV 1.22 µV
±25 mV 3.05 µV
±50 mV 6.10 µV
±100 mV 12.20 µV
±250 mV 30.52 µV
±500 mV 61.04 µV
±1 V 122.07 µV
±2.5 V 305.18 µV
±5 V 610.35 µV
±10 V 1.22 mV
±25 V 3.05 mV
±50 V 6.10 mV
Thermocouple Temperature Measurement Resolution:
TC Type Resolution
J 0.086 °C
K 0.096 °C
T 0.037 °C
B 0.096 °C
R/S 0.111 °C
E 0.073 °C
N 0.092 °C
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
Minimum sample throughput (hardware): 3.58423 S/s with a single enabled channel
0.358423 S/s with two or more enabled channels
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
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


Introducing the DI-245 Voltage and Thermocouple DAQ
Introducing the DI-245

The DI-245 features 4 inputs programmable as Voltage or Thermocouple.
The DI-245 and Common Mode Rejection
Common Mode Rejection

This video demonstrates the ability of the DI-245 to reject common mode voltage. Very impressive!
Making Thermocouple Temperature Measurements Using a DATAQ Instruments Data Logger
Thermocouple DAQ

Learn how to make Thermocouple Temperature Measurements.
Exporting Data to Excel
Export data to Excel

Learn how to export data from WinDaq Waveform Browser to Microsoft Excel.
Introduction to WinDaq Data Acquisition Software
WinDaq Data Acquisition Software

Introduction to WinDaq Data Acquisition Software.

Similar Products

Quick Product Comparison

Expansion with
other models (DI-)
Max Sample
Rate (Hz)
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:

±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