Fault Detection Methods in Circuit Testing:
- Direct Observation Method: This method involves checking the instrument selection and usage, power supply voltage level and polarity, component pin connections, wiring, and observing for signs of overheating or burning.
- Multimeter Static Operating Point Check: Using a multimeter to measure the DC working state of the circuit and resistance values in the line, analyzing measured values for faults. Oscilloscope can also be used for determining static operating points.
- Signal Tracing Method: Injecting a signal into the circuit and using an oscilloscope to observe waveform and amplitude changes step by step, identifying abnormal stages in the circuit.
- Comparison Method: Comparing parameters with normal or theoretical values to identify abnormality and determine the fault point.
- Parts Replacement Method: Replacing parts with corresponding components from a working instrument to isolate and identify the fault.
- Bypass Method: Using a appropriately sized capacitor to eliminate unwanted signals and identify the source of parasitic oscillations.
- Short-Circuit Method: Temporarily short-circuiting parts of the circuit to identify open circuit faults.
- Open Circuit Method: A method of narrowing down suspected failure points by gradually disconnecting branches of the circuit.
