What is the purpose of the External Accuracy Test (EAT) with a tuning fork?

The purpose of the External Accuracy Test (EAT) with a tuning fork is to verify the accuracy of RADAR readings. This test involves using a tuning fork that emits a specific frequency that corresponds to a precise speed. When the tuning fork is struck and held near the RADAR unit, the RADAR should read the emitted frequency accurately. If the RADAR produces a reading that matches the intended speed from the tuning fork, it confirms that the device is functioning correctly at that specific frequency and speed.

This process is crucial for ensuring that the RADAR units provide accurate readings when measuring the speed of moving objects, such as vehicles. Regular checks with the tuning fork help maintain the integrity of the speed detection process and ensure that law enforcement operations are based on reliable data. The EAT is therefore essential for validating the performance of the RADAR system before it is used in the field.