Signal tracer For long pulse trains, a cyclic redundancy check may be calculated and displayed, giving the tech insight into the content of circuits that are switching rapidly. Signal tracer A signal tracer is a piece of electronic test equipment used to troubleshoot radio and other electronic circuitry. Usually a very simple device, it normally provides an amplifier, and a loudspeaker, often battery-powered and packaged into a small, hand-held test probe. An optional diode detector is usually also provided, allowing the detection of amplitude-modulated signals. The technician injects a test signal into the device under test. Then, by using the signal tracer,
Fuel saving device difference in economy or power in tests on ten separate vehicles, finding that the device did nothing but light up. "Car and Driver" magazine found that the device contains nothing but "a simple circuit board for the LED lights", and disassembly and circuit analysis reached the same conclusion. The maker disputed claims that the device has no effect, and proposed changes to the "Consumer Reports" testing procedure, which when implemented made no difference to the results. Another device described as 'electronic' is the 'Electronic Engine Ionizer Fuel Saver'. Testing of this device resulted in a loss of power and an