What does DVI mean in UNCLASSIFIED

A Digital Voltage Indicator (DVI) is a device used to measure and display the voltage of an electrical circuit. It provides a digital readout of the voltage, typically in volts (V), and is designed for non-contact voltage detection.

DVIs utilize capacitive coupling to detect the presence of voltage in a circuit. They contain a high-impedance input that senses the electric field surrounding the conductor without making physical contact. The detected field is then converted into a digital signal that is displayed on the indicator.

DVIs offer several advantages over traditional voltage testers:

• Non-Contact Measurement: They eliminate the risk of electric shock by allowing voltage measurement without physical contact with the circuit.
• Safety: They provide a safer method to detect voltage, especially in high-voltage applications.
• Convenience: They are easy to use, requiring no special training or expertise.
• Accuracy: Modern DVIs offer accurate voltage readings with high resolution.

DVIs have certain limitations:

• Sensitivity: They may not be sensitive enough to detect very low voltage levels.
• Accuracy: While accurate, DVIs can be affected by external factors like environmental noise or interference.
• Polarity Detection: Some DVIs may not indicate the polarity of the voltage (positive or negative).

When using a DVI, it is important to follow these safety precautions:

• Disconnect Circuit: Always ensure that the circuit under test is de-energized before using any voltage indicator.
• Check Calibration: Regularly calibrate the DVI to ensure accurate readings.
• Avoid Contact: Do not touch the conductors or terminals while using the DVI.
• Inspect Equipment: Inspect the DVI before each use for any damage or defects.