The decaying AC ringing waveform is fed into a high-speed voltage comparator (like the or an internal microcontroller comparator).
When a good inductor is pulsed with a voltage, it creates a "ringing" effect—a decaying sinusoidal wave. If there is even one shorted turn in the winding, the energy is absorbed, and the ringing is instantly damped or eliminated. Key Applications
Here’s the process in detail:
When the transistor abruptly turns off, the energy stored in the magnetic field of the DUT (Lx) collapses. This energy transfers back and forth between the inductor and the internal tank capacitor (Cx), creating a decaying AC sine wave oscillation (ringing). 3. Threshold Detection and Display blue ring tester schematic diagram exclusive
For detailed assembly or a full schematic layout, resources such as the Blue Ring Tester Kit Assembly Manual from AnaTek Corporation or community-driven documentation on Scribd provide comprehensive diagrams. Help with Blue Ring Tester - General Electronics
4. Pulse Counter and LED Driver (The Microcontroller Approach)
The decaying AC voltage generated by the ringing coil is rectified by a fast switching diode (like a 1N4148) and fed into a series of voltage comparators. Quad op-amps or comparators like the LM324 or LM339 are ideal for this stage. The decaying AC ringing waveform is fed into
The "exclusive" nature of this tester's efficiency comes from its ability to:
Blue Ring Tester is a specialized diagnostic tool used to identify shorted windings in high-Q inductive components like flyback transformers (FBT), switch-mode power supply (SMPS) transformers, and deflection yokes. Unlike a standard ohmmeter, which only measures DC resistance, a ring tester applies a fast voltage pulse to the component and counts the resulting resonant "rings" (damped oscillations) to determine its quality factor, or Core Schematic & Component Overview
The output pulse passes through a switching transistor to isolate the logic from the test probes. A high-quality capacitor sits in parallel with the test leads. When you clip the probes to a transformer winding, this capacitor forms the resonant LC tank circuit. Clamping diodes are placed across the inputs to protect the sensitive ICs from high-voltage spikes generated by large inductors. 3. The Pulse Waveform Inverter (CD4069UB) Key Applications Here’s the process in detail: When
The transformer winding is completely short-circuited or completely open. Tuning and Calibration Tips
Ignition coils operate at high voltage and are prone to internal arcing (carbon tracking) which creates a shorted turn. Test them out of the vehicle with this circuit.