Westinghouse / ABB D5S (1983 to 1996) Previous
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The D5S meter was a slight redesign of the D4S, and the most significant chage was moving the light-load adjuster back to the right side of the frame. A number of other small changes were made to better adapt this model to automated assembly equipment and to improve the meter's operating characteristics. Some of the earlier examples of this model did have issues with the disk bearings, causing accuracy concerns on light loads.
When ABB bought Westinghouse's meter division in 1990, the ABB logo was phased in gradually, and these later D5S meters have aluminum faces instead of the white faces used since the DS was introduced.
Westinghouse D5S
Photo by David Dahle