This low cost module measures the short-term accuracy of 60 Hz sources. A bright bargraph indicator displays variations around the ideal frequency.

Description

Many devices make use of the 60 Hz waveform from the local power utility as a timing standard. While the long-term accuracy of this source is assured through periodic adjustments made to the power grid, there is significant drift above and below the expected norm throughout the course of a typical day. This useful tool shows at a glance whether the power line frequency is currently above or below 60 Hz in 0.005 Hz increments (1 part in 12000).
 

Features

• Simple plug-in measurements of 110 VAC power lines;
• Microcontroller-based for low cost, high reliability;
• Crystal controlled time-base for stable measurements;
• Twenty-segment bargraph display for precise readout;
• "On-Frequency" indicator and optional high/low capture mode.

More Information

• Circuit Details
• Prototype Photo