Brooke, I had the very same encounter in 1989/1990. I received the new 3458A in November 1989, and only 1 month later, on 1st January 1990, the New Volt (SI-1990) went effective. As my instrument came directly from the U.S., the difference in calibration was 9.264ppm, which the instrument now was reading high. You may read my whole volt-nuts story related to this SI - change here: http://www.eevblog.com/forum/metrology/1000-my-(hi)story-of-the-weston-cell-of-the-volt-and-of-being-a-volt-nuts/. The 332B might not have been your reference standard, as its uncertainty is 10ppm / 60days only. Maybe you had a 732A, or a bank of Weston cells in your lab, otherwise this change could not securely be observed by a solitary Fluke 33xB/D. best regards Frank
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