Graph of mains voltage (Vrms) and frequency (Hz) over one day or week at Elmac Services

Description

This graph shows the mains frequency and voltage, recorded every 2 seconds and averaged over a 10 minute period throughout the day. The main line shows the actual average while the shading shows the spread of maximum and minimum values recorded during the 10 minute period. Select the date(s) to view from the boxes below, and hover the mouse over the graph to see the actual values at any given time. The graph can be zoomed by dragging within it, but to unzoom you will need to refresh the page and date. NB we're taking a break in August and yes, there are some gaps in the dates!
Graphing courtesy of Dygraphs

Commentary

A description of the measurement system used for these graphs,  and some comments regarding the issue of mains frequency which triggered this project, can be found here.
Last updated: 16th August 2020
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