Present-day benchtop and rack-and-stack automated test systems predominantly utilize IEEE 488 digital multimeters (DMMs) while PC-based test systems tend to use data acquisition boards as the primary measurement instruments. This is because PC plug-in DMMs have not been around very long, and many of the early plug-ins failed to meet the requirements of benchtop and system DMMs. Newly developed 4.5-, 5.5-, and 6.5-digit PC plug-in DMMs are making inroads into test systems, ranging from automotive and disk-drive manufacturing to just about any automated test application. These new PC plug-in DMMs work without the extra interface cards and cables required with an external DMM.
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