Automatic Test Equipment on a

文章摘要：When designing the hardware for a test instrument, using the proper design technique from the beginning eliminates or minimizes difficult-to-solve problems that could occur as the design progresses. Separating digital and analog grounds, using optoisolators, identifying high-impedance nodes, spendin

Automatic Test Equipment on a,标签：计算机控制技术,工厂电气控制技术,http://www.88dzw.com

When designing the hardware for a test instrument, using the proper design technique from the beginning eliminates or minimizes difficult-to-solve problems that could occur as the design progresses. Separating digital and analog grounds, using optoisolators, identifying high-impedance nodes, spending time on component placement, accounting for voltage drops in power and ground traces, and other techniques all increase the chances of a successful design.

Developing the test instrument's software also mandates careful design. Write the software in small steps, making sure to partition the software so that future changes can be made readily. If possible, use SCPI commands when working with IEEE-488 buses. When debugging software, the PC's RS-232 serial port provides a convenient means of communicating with the tester's microprocessor. Keep memory locations used for diagnostic purposes available in the final version of the software, as customers and field technicians could benefit from them. In addition, use a watchdog timer, because these devices provide a convenient method for extricating a microprocessor from an infinite loop.

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