All Of The Following Are Common Dmm Ranges Except:

All of the Following Are Common DMM Ranges Except: Understanding Digital Multimeter Measurements

Digital multimeters (DMMs) are essential tools for electricians, electronics hobbyists, and anyone working with electrical circuits. They measure various electrical properties, and understanding their different ranges is crucial for accurate and safe measurements. This article will explore common DMM ranges and identify which option isn't typically found on a standard DMM. We'll also delve into the importance of selecting the correct range for your specific measurement needs.

Common DMM Measurement Ranges

DMMs are versatile instruments capable of measuring a wide range of electrical parameters. Here are some of the most common ranges you'll encounter:

• Voltage (DC and AC): This measures the potential difference between two points in a circuit. DC (direct current) voltage is constant, while AC (alternating current) voltage changes polarity periodically. You'll find ranges like 200mV, 2V, 20V, 200V, and even 1000V on most DMMs. The range you select depends on the expected voltage level; choosing an incorrect range can damage the meter.

• Current (DC and AC): This measures the rate of flow of electric charge. Similar to voltage, you'll find ranges for both DC and AC current, often starting at lower milliamp (mA) ranges and progressing to higher amp (A) ranges. Always start with the highest range and carefully reduce it as needed, as exceeding the maximum current rating can damage the meter.

• Resistance: This measures the opposition to the flow of electric current. Ranges typically start at lower ohms (Ω) and go up to megaohms (MΩ), allowing for accurate resistance measurements in various components and circuits. Always ensure the circuit is de-energized before measuring resistance.

• Capacitance: Some DMMs also measure capacitance, the ability of a component to store electrical energy. This is usually measured in farads (F), ranging from picofarads (pF) to microfarads (µF) or even millifarads (mF) depending on the DMM's capabilities.

• Frequency: Many modern DMMs include a frequency measurement function, measuring the number of cycles per second (Hz) of an AC signal. This is especially helpful for analyzing AC waveforms.

• Temperature: Some DMMs have a built-in thermocouple to measure temperature, often in degrees Celsius (°C) or Fahrenheit (°F).

The Uncommon Range

Considering the typical ranges of a standard DMM, a common range that is exceptional is the measurement of inductance (in Henries - H). While some specialized DMMs or LCR meters offer inductance measurement, it's not a standard feature on most general-purpose digital multimeters. You would need a dedicated inductance meter or a more advanced multimeter with this capability.

Choosing the Right Range

Selecting the appropriate range is crucial to ensure accurate readings and protect your DMM. Always start with the highest range and gradually decrease it until you obtain a stable and readable measurement. Never attempt to measure a voltage or current significantly higher than the DMM's maximum rating.

Conclusion

Understanding the various ranges on a DMM is essential for safe and effective use. While voltage, current, resistance, and capacitance are common features, inductance measurement is typically not found on standard DMMs. Remember to always select the correct range before making any measurement to avoid damaging the meter and obtaining inaccurate results.