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Multimeters & Oscilloscopes

Multimeters and oscilloscopes are enabling the measurement and analysis of electrical signals and parameters in circuits.

Multimeters

Usage

  • Voltage Measurement:
    • Measure AC and DC voltage levels in circuits.
  • Current Measurement:
    • Measure current flowing through a circuit (both AC and DC).
  • Resistance Measurement:
    • Determine the resistance of components and circuits.
  • Continuity Testing:
    • Check if there is a complete path for current flow, often with an audible beep.
  • Diode Testing:
    • Test the functionality of diodes.

Theory

  • Basic Functionality:
    • Multimeters operate based on the principle of Ohm's Law, using a combination of resistors and transistors to measure voltage, current, and resistance.
  • Modes:
    • Most multimeters have different modes for measuring voltage, current, resistance, and continuity.

Models:

  • Entry-Level
    • ANENG A830L(<$10) : very cheap one from Aliexpress for example, can break though
  • Mid-Range
    • crenova ms8223d ($25): Frequently used by myself, very reliable
  • High-End
    • Fluke 115 (>$200): very precise, but not really needed if you are not a professional

Oscilloscopes

Usage

  • Waveform Visualization:
    • Display and analyze the waveform of electrical signals over time.
  • Signal Analysis:
    • Measure parameters like frequency, amplitude, rise time, and signal integrity.
  • Debugging
    • Identify issues in electronic designs, such as timing problems or noise in signals.
  • Protocol Analysis
    • Analyze digital signals and communication protocols.

Theory

  • Basic Functionality
    • Oscilloscopes measure voltage over time and display the results on a screen, usually as a graph. They work by sampling the input signal at high speeds and reconstructing the waveform.
  • Components
    • Key components include the vertical amplifier (for voltage), horizontal time base (for time), and triggering system (to stabilize the waveform display).

Models

  • Entry-Level
    • PeakTech 1401($200) : Entry level, good reviews
  • Mid-Range
    • Rigol MSO5000 Serie ($1000): Used by myself, very reliable
  • High-End
    • SDS2000X ($3000): High bandwidth, 2GSa/s sampling rate, large memory depth, but not really needed if you are not a professional

Resources