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Difficulty: MediumSpecialized Testers

During the bench repair of an analog power supply, an electronics technician needs to verify whether a suspected bipolar junction transistor has suffered internal junction breakdown and determine its direct current gain (hFEh_{FE} or β\beta). Which specialized test instrument is specifically engineered to perform these component checks?

  1. A
    Digital wattmeter
  2. B
    AC voltmeter
  3. Transistor testerAnswer
  4. D
    Galvanometer

Answer

The transistor tester is specifically designed to test the internal junctions, identify leads, and measure the DC current gain (hFEh_{FE}) of bipolar junction transistors.
A transistor tester is engineered specifically to test solid-state bipolar transistors. It applies precise DC biasing to the device under test, measures the resulting collector and base currents, computes the DC current gain (hFE=IC/IBh_{FE} = I_C / I_B), and verifies whether the internal P-N junctions are open, shorted, or normal.

Step-by-Step Solution

1
Analyze the diagnostic task and parameters required
The technician needs to determine transistor junction health (checking for open or shorted junctions) and measure the direct current amplification factor (hFE=IC/IBh_{FE} = I_C / I_B).
Selecting the correct specialized tool requires matching the tool's built-in functions with the specific component parameters being tested.
2
Evaluate the capabilities of specialized electronics testing instruments
A transistor tester supplies calibrated base currents, monitors collector responses, calculates current gain (hFEh_{FE}), and detects open or shorted internal diodes.
Standard multimeters, voltmeters, and wattmeters do not provide the active parametric test environment needed for complete semiconductor analysis.

Key Concept

Specialized semiconductor testers supply dedicated DC test currents to evaluate internal junction integrity and measure active parameters such as current gain (hFEh_{FE}).
Estimated Time:1m 0s
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Specialized Testers

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