IEPE Measurement HAT

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MCC 172
IEPE Measurement DAQ HAT for Raspberry Pi®
The MCC 172 is a two channel DAQ HAT for making sound and vibration measurements from IEPE sensors like accelerometers and microphones. It features a 24-bit A/D per channel and a maximum sample rate of 51.2 kS/s/Ch. Up to eight MCC HATs can be stacked onto one Raspberry Pi allowing users to create high-channel count, multifunction solutions of different signal types.

All MCC DAQ HATs include easy-to-use C/C++® and Python™ open-source libraries and examples for taking reliable, quality measurements quickly.

NOTE: Raspberry Pi is not included with the MCC 172.

MCC DAQ HATs WHITE PAPER

Supporting Raspberry Pi® in OEM and Test and Measurement Applications
Popularity of Raspberry Pi
MCC DAQ HATsThere is a lot of buzz surrounding the Raspberry Pi platform. Due to its eye-popping capabilities and low price, engineers are investigating more ways to use it in their designs.
Raspberry Pi is the 3rd best-selling general-purpose computer platform, trailing only the Microsoft® Windows® PC and Apple® Macintosh®. The secrets to its success are in price, performance, and flexibility. For $35 the Raspberry Pi 4 Model B offers a 64-bit quad-core ARM processor, gigabit ethernet, wireless, Bluetooth, 4 USB ports, micro SD slot, and dual HDMI outputs.
While originally created for the education market to teach computer science to students across the globe, it has rapidly expanded beyond the intended market into the hobbyist/maker market and increasingly into industrial/commercial markets.

Raspberry Pi Used in MCC Product Design
The power and capabilities of the Raspberry Pi is starting to be leveraged widely across industry, including by Measurement Computing where it is integrated into the design of its WebDAQ Series of data loggers. With the Raspberry Pi Compute Module 3 and a data acquisition device, MCC created the high performance WebDAQ 504 acoustic/vibration data logger which acquires and logs 4 channels of 24-bit data, performs an FFT on all 4 channels, and displays the data to the user from a responsive web server. The success of the Raspberry Pi in processor intensive, professional engineering applications such as this demonstrates why it is now being considered as an OEM option for industrial designs.

Raspberry Pi in Test and Measurement
The Raspberry Pi does not have built-in Test and Measurement capabilities such as Analog-to-Digital Converters (ADCs), Digital-to-Analog Converters (DACs), or conditioned Digital Inputs and Outputs (DIO). These capabilities can, however, be expanded either through the USB port or a 40-pin header that provides GPIO pins which support both SPI and I2C. A device that connects directly to the 40-pin device and stack on the Raspberry Pi is called a HAT (Hardware Attached on Top).

Over the years, individuals have published open-source designs and small companies have sold low-cost HATs for a variety of tasks, including support for analog and digital I/O. These designs and products are adequate for the education and hobbyist/maker market but have some serious short comings for professional Test and Measurement applications. Most of these devices are provided partially assembled, without specifications or programming support, and without performance guarantees that can only be achieved with a thorough device validation process.

Device validation is a vitally important step in the design process as it ensures that quality metrics are adhered to and the product performs as specified. Without this process, data derived from the product might be inaccurate and endanger results that are shared, published or used for critical design decisions. The exhaustive design and validation process under-taken by Measurement Computing and other Test and Measurement companies, makes for a significant difference between most open-source designs and low-cost Raspberry Pi HATs and commercial measurement products.

MCC Support for Raspberry Pi Applications
In order to bring professional-quality measurement products to the Raspberry Pi platform, Measurement Computing has released Universal Library for Linux™ (UL for Linux) and a family of HATs specifically for professional Test and Measurement applications.

UL for Linux™ is an open-source Linux library which supports our most popular USB devices and provides a programming interface for both Python™ and C/C++®. This library is verified on multiple Linux distributions including Raspbian®, the distribution most popular on Raspberry Pi computers. UL for Linux and MCC’s wide selection of USB DAQ devices, greatly expands the capabilities of the Raspberry Pi computer.

While USB is the preferred option for interfacing DAQ devices in many applications, it still requires an additional cable and box. When the form-factor and physical size of the Raspberry Pi is critical to the design, a HAT solution may be more appropriate.

MCC’s family of HATs are specifically for the Test and Measurement and OEM/ODM markets. MCC DAQ HATs come with high-quality SW libraries that support Python and C/C++ to facilitate quick and easy development. Like all MCC products, the DAQ HATS are designed in the USA, use parts sourced through proven distributors, are fully tested and come with a 30-day money back guarantee and a 1-year warranty.

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About Measurement Computing
Measurement Computing designs and manufactures data acquisition devices that are easy to use, easy to integrate, and easy to support. Included software options are extensive and provided for both programmers and non-programmers. Free technical support and low cost of ownership make Measurement Computing the easiest choice for DAQ.