In electronic measurement and experiment, the following principles should be followed when connecting electronic instruments and instruments to the circuit under test:
1. "Common ground" connection principle
The so-called "common ground" is to use the electronic instrument to measure the electronic circuit, the grounding end of the instrument used (usually marked with the "⊥" symbol, indicating that the end of the instrument has been connected to the instrument) and the ground of the circuit under test (also marked The "⊥" symbol, which means the AC reference zero potential point of the circuit, is firmly connected. The purpose of this is to prevent the introduction of interference and ensure the accuracy of the measurement; the second is to protect the measuring instrument and not damage the circuit under test.
2. Principle of orderly placement of instruments
The instruments used should be placed in an orderly manner in the direction of the signal flow to avoid crossover and feedback of the input and output signals, resulting in new interference and self-excitation. As the frequency of the test signal increases, more attention should be paid to the principle of orderly placement. This also facilitates testing and inspection.
3. DC stabilized power supply according to the circuit polarity requirements, the correct access principle
Electronic circuits are usually powered by DC. Because of the different devices used in the circuit, the power supply ground terminal is connected to the ground of the circuit under test.
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