A standard multimeter measures resistance (DC), but it cannot detect a single shorted turn in a high-inductance coil. The resistance difference between a good transformer and a defective one is often less than 0.1 ohms—invisible to a standard ohmmeter.
The coil is functional. Lower readings are common for smaller inductors or specific yoke windings.
Always desolder at least one leg of the transformer or yoke from the circuit board before testing to prevent in-circuit components from dampening the ring. blue ring tester schematic diagram exclusive
When the pulse is applied to the component under test, it forms an implicit LC (Inductor-Capacitor) tank circuit. The is the device under test. The tester provides the resonant capacitor.
Drop a comment below. Let's keep the old analog magic alive. A standard multimeter measures resistance (DC), but it
Every time the ringing waveform swings cleanly above this threshold, the open-collector output of the LM393 pulses low, pulling down the charge stored in the integration network ( R4cap R sub 4 C2cap C sub 2 3. The Integrator and Visual Driver Stage (LM3914) The pulse train from the comparator is integrated by R4cap R sub 4 C2cap C sub 2
The Blue Ring Tester operates on the principle of or "ringing." Lower readings are common for smaller inductors or
This article provides an in-depth look at the , explaining how this powerful circuit functions to save hours of diagnosis time. What is a Blue Ring Tester?
I have designed this to look like a high-value "share" within the electronics community.