Introduction
Software-configurable analog input/output (I/O) modules for industries open up new possibilities for compact and convenient calibrators. These modules are crucial for transmitting and receiving precise low-level voltage and current signals from sensors and actuators in factory workshops. Over time, their performance can decline due to extended use and environmental changes, necessitating regular calibration to ensure they meet predefined standards.
Current Calibration Instruments
Calibrating various channel types on I/O modules typically requires voltage sources, meters (usually in the ±10 V range), current sources, and meters (typically ±20 mA range). Additionally, a source simulating different thermocouples and RTDs (PT100/PT1000) is needed for temperature measurements. Technicians often need to carry multiple devices to the control cabinet, as integrated precision instruments can be expensive, bulky, and heavy.
Portable Calibrator
The MAXREFDES183# reference design (see Figure 2) offers a solution as a software-configurable, battery-powered precision calibrator compatible with common industrial analog inputs and outputs, as well as voltage and current ranges. It provides precise analog voltage and current output and input, along with high-precision temperature measurement and simulation. Notably, it is compact, lightweight, and portable compared to traditional calibrators.
Features
MAXREFDES183 is based on MAX22000, a software-configurable industrial-grade analog I/O (SWIO) device designed for measuring voltage and current, with additional inputs for measuring temperature. It features fast-settling 18-bit digital-to-analog converters (DACs) and a 24-bit Sigma-Delta analog-to-digital converter (ADC) for each converter. The IC uses a high-speed SPI bus for configuration and transmitting conversion results. Operating at 2.7 V to 3.6 V for analog and digital power and ±24 V high-voltage power, the device comes in a 64-pin LGA package, operating within an industrial temperature range of -40°C to +125°C. The reference design also includes MAX32625, an ultra-low-power Arm Cortex-M4 microcontroller with 512 KB flash and 160 KB static random-access memory (SRAM), interfacing with MAX22000 via SPI.
Performance
MAXREFDES183# performance is comparable to or even better than other calibrators on the market, with high accuracy and stability. The compact size and lightweight design make it highly portable.
Calibration Procedure
MAXREFDES183# includes a user-friendly pre-programmed calibration menu (see Figure 3) that guides technicians through the calibration process. It provides clear feedback, ensuring users understand the results and whether they fall within an acceptable range.
Conclusion
MAXREFDES183# is a cutting-edge precision calibrator based on software-configurable analog input/output. Its compact design, portability, and high-performance features make it a benchmark for the next generation of calibrators. It offers distinct advantages over traditional counterparts, combining accuracy, efficiency, and ease of use in a single device.
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