Digilent DT8874-24T-00R-00V – MEASURpoint Ethernet DAQ Instrument (24 Thermocouple Inputs)

The DT8874 MEASURpoint Ethernet data acquisition (DAQ) devices and DT9874 MEASURpoint USB data acquisition (DAQ) systems provide simultaneous analog input and any combination of isolated temperature, resistance, and voltage measurements. These devices feature one A/D per channel and auto calibration in a rugged half rack enclosure for immediate productivity.

QuickDAQ: Acquire and display from all Data Translation USB and Ethernet devices that support analog input streaming. Acquire data, record data to disk, display the results in both a plot and digital display, and read a recorded data file. Two additional options can be purchased to add FFT analysis capabilities to the base package. Also, data can be exported to other applications like Microsoft Excel® and MATLAB® for more advanced analysis

IVI-COM driver: Works in any development environment that supports COM programming, including Visual Basic®, Visual C#® .NET, MATLAB®, VEE Pro, NI LabVIEW® or LabWindow, and others.

SCPI support (DT8874 only): SCPI (Standard Commands for Programmable Instruments) is a universal programming language for electronic test and measurement instruments, based on the IEEE 488.1 and IEEE 488.2 standards

*Supported Operating Systems: Windows 10/8/7/Vista/XP 32/64-bit

• DT8874-00T-00R-16V: MEASURpoint Ethernet Instrument; 16 Voltage inputs
• DT8874-00T-00R-48V: MEASURpoint Ethernet Instrument; 40 Voltage inputs
• DT8874-00T-16R-32V: MEASURpoint Ethernet Instrument; 16 RTD inputs, 32 Voltage inputs
• DT8874-00T-40R-08V: MEASURpoint Ethernet Instrument; 40 RTD inputs, 8 Voltage inputs
• DT8874-08T-00R-40V: MEASURpoint Ethernet Instrument; 8 Thermocouple inputs, 40 Voltage inputs
• DT8874-16T-16R-16V: MEASURpoint: Ethernet Instrument; 16 Thermocouple inputs, 16 RTD inputs, 16 Voltage inputs
• DT8874-24T-00R-24V: MEASURpoint Ethernet Instrument; 24 Thermocouple inputs, 24 Voltage inputs
• DT8874-40T-00R-08V: MEASURpoint Ethernet Instrument; 40 Thermocouple inputs, 8 Voltage inputs

DT9874 Series

• DT9874-16T-00R-00V: MEASURpoint USB Instrument; 16 Thermocouple inputs
• DT9874-48T-00R-00V: MEASURpoint USB Instrument; 48 Thermocouple inputs

Voltage Channel Features:

• Direct connection of analog input channels for differential voltage inputs; removable screw terminal blocks for each channel for quick wiring
• Software-selectable input range of ±10 V or ±60 V per channel (note that for the ±60 V range, no more than 30 Vrms, 42.4 Vpk, 60 VDC is allowed)

Thermocouple Channel Features:

• One CJC (cold junction compensation) input for each thermocouple channel
• B, E, J, K, N, R, S, and T thermocouple types supported; the instrument automatically linearizes the measurements and returns the data as a 32-bit, floating-point temperature values
• Input range of ±0.075 V (with 0.25 V RMS A/D noise using no software filtering)
• Break-detection circuitry to detect open thermocouple inputs
• RTD Channel Features

General Features:

• One 24-bit, Delta-Sigma A/D converter per channel for simultaneous, high-resolution measurements
• 30 VAC, 60 VDC continuous functional isolation ch-ch and ch-gnd, verified by a 500 Vpk withstand
• Throughput rate of up to 10 Samples/s for all channels
• Software or external, digital trigger on digital input line 0 starts acquisition
• Auto-calibrating front-end resets the zero point on each power-up; in addition, the instrument supports anytime calibration, performing an auto-calibration function on

software command

• Measurement Instrument Calibration Utility allows you to calibrate the instrument in the field (see page 21 for more information on this utility)
• 8 opto-isolated digital input lines; you can read the digital input port through the analog input data stream for correlating analog and digital measurements
• 8 opto-isolated digital output lines; the outputs are solid-state relays that operate from ±30 V at currents up to 400 mA (peak) AC or DC

RTD Channel Features:

• Configurable analog input channels for RTDs and differential voltage inputs; easy-access jacks for each channel for quick wiring
• 100 Ω, 500 Ω, and 1000 Ω platinum RTD types supported using alpha curves of 0.00385 (European) or 0.00392 (American)

The MEASURpoint instrument series provides up to 48 configurable channels (depending on the model), allowing for ultimate flexibility with thermocouple, RTD, and voltage inputs. Because MEASURpoint architecture uses an A/D per channel, sampling rates of up to 10 Hz per channel simultaneously can be achieved.

The RTD input channels provide a 4-wire RTD input with Kelvin sensing for maximum accuracy by eliminating errors due to wire resistance. You can attach a voltage input or any of the following RTD types to these channels in a mix and match fashion: Platinum 100 Ω (Pt100), Platinum 500 Ω (Pt500), or Platinum 1000 Ω (Pt1000) RTD using an European alpha curve of 0.00385 or an American alpha curve of 0.00392. The supported temperature measurement range for these RTD types is –200 °C (–328 °F) to 850 °C (1562 °F). You can also measure a resistance value in Ohms, if desired. The analog input range is ±1.25 V.

Thermocouples are “relative” not “absolute” temperature measuring devices that generate voltage as a function of the temperature difference between both ends. The DT9874 and DT8874 incorporate an independent CJC circuit for every channel. The board-level CJC is embedded in a metal bar for excellent thermal conductivity and optimum consistency

A trigger is an event that occurs based on a specified set of conditions. Acquisition starts when the instrument detects the initial trigger event and stops when the buffer has been filled or you stop the operation. MEASURpoint instruments support a software trigger and an external trigger on digital input line 0.

MEASURpoint instruments feature eight, isolated, digital input lines. The digital input lines operate from +3 to +28 VDC, with a switching time of 2 ms maximum.

MEASURpoint instruments are perfect for driving relays directly, featuring eight, isolated, digital output lines. The outputs are solid-state relays that operate at ±30 V and 400 mA peak (AC or DC) with a 2 ms max switching time.

MEASURpoint uses high-precision, high-stability, lowdrift voltage references rated at 4 PPM per degree and 100 PPM drift per year. This means MEASURpoint is accurate now and will remain that way over time.

Our custom DC-DC converters circuits have a unique power distribution system that supplies power to only 2 of the 6 boards at any one time. Cycling non-adjacent boards in this manner creates less power surges, reduces noise, and improves the overall system performance.

MEASURpoint instruments provide channel-to-channel functional isolation of 60 VDC maximum continuous working voltage, meaning that each input can be referenced to 60 VDC maximum, with a 500 Vpk withstand rating, verified by a 5 s dielectric withstand test. By providing isolation, MEASURpoint instruments minimize common-mode noise and ground loop problems to preserve accuracy for all sensor inputs. This is especially useful when conditions change in the electrical environmental due to motor current surges, electromagnetic radiation, or noisy industrial equipment turning on/off.

Users can calibrate any MEASURpoint instrument in the field using precise calibration equipment and the Measurement Instrument Calibration Utility. This free utility allows you to revert to the factory calibration for any or all channels, or revert back to the last user calibration values, if desired. In addition, this utility generates a report that lists the starting and ending calibration values for each channel, allowing traceability.

The network-ready versions of MEASURpoint are LXI™ Class C compliant and provide a standard Ethernet connection to support remote monitoring and control from the field or on the factory floor. Channels can be expanded by adding more instruments to the network.

QuickDAQ allows you to acquire and display from all Data Translation USB and Ethernet data acquisition devices that support analog input streaming. Combine QuickDAQ with Data Translation hardware to acquire data, record data to disk, display the results in both a plot and digital display, and read a recorded data file.

Be productive right out of the box with this powerful data logging software. Data can be exported to other applications like Microsoft Excel® and Mathworks MATLAB® for more advanced analysis. Two additional options can be purchased to add FFT analysis capabilities