![]() ![]() ![]() One fork simulates the patrol car speed, the other fork simulates a moving target reflection. Two tuning forks with different tones are required to test moving mode. Moving mode test is a little more involved and a little confusing. The fork's "side" must be facing the antenna to register a speed reading. Once the fork is vibrating place it a few inches in front of the antenna. To start the fork vibrating gently strike the top side against a hard object such as wood or plastic, not metal. Testing the radar stationary mode is straight forward, place a vibrating fork a few inches from the front of the antenna, the radar should read the speed the fork is calibrated to induce. For dual antenna radars, the test should be conducted on each antenna. Some places also require the test when a citation is issued, and/or at end of shift. The test should be conducted at start of shift, at a minimum. The forks should be labeled with, Speed, Radar Frequency, and Serial Number for tracking and accountability.Ī radar should be tested with tuning forks on a daily basis. The radar calibration certificate should include the tuning fork serial numbers that go with that radar. The supplied forks are the only forks that should be used to test the radar. The radar is measuring the microwave reflection of the fork or speaker diaphragm - a complete end-to-end test.Īll radars come with tuning forks tuned for that radar. A radar will also measure a tone from an audio speaker diaphragm. supply voltage (car or internal battery)Ī police or sports Doppler microwave radar will register a speed from a vibrating tuning fork's narrow side, the higher the tone the higher the speed. ![]() Tests / Automatic Adjustments may include Self-test only checks and adjusts a portion of the electronics, the radar should also be checked with calibrated tuning forks before use. The degree a radar self-test and automatically adjust circuits varies with model and ranges from none or little to testing 50 percent or more of the electronics. Long range, most sensitive, may make the radar susceptible to local interference. The Range Control is actually the receiver sensitivity setting. Set radar to Receive Only mode and scan for interference at operation site. Best to run test at operational location. Test vehicle should have a calibrated speedometer for a valid test. Test Radar against Vehicle of Known Speed.Two (2) tuning forks with different resonances required to test moving modes. Check Radar with Calibrated Tuning Fork(s).A sticker on the radar, or records, should indicate last calibration test, next (due) test, and who tested. Most states require a radar be tested by a certified shop periodically, typically once or twice a year. To insure radar hardware is setup and functioning properly the operator should perform several actions. Next Speed Radar Test and Calibration Contents. Acceleration Parameters Constants / Conversions Police 10 Codes Universal Time (UTC) Links Blog Previous |
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