The Automation of Standard Cell Intercomparisons
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A system has been installed to intercompare standard cells under total computer control with a repeatability of 5 nV.
[1] Andrew F. Dunn. Maintenance of a Laboratory Unit of Voltage , 1971 .
[2] Andrew F. Dunn. Automatic Intercomparison of Standard Cells , 1974 .
[3] E. So. A Current-Comparator-Based 20-Bit Digital-to-Analog Converter , 1985, IEEE Transactions on Instrumentation and Measurement.