What are the safety precautions for high-voltage testing instruments?

High-voltage testing involves handling high-voltage electricity, and safety is always the top priority. Your concern about this issue indicates you already value risk management, which is crucial.

General Safety Principles: The fundamental principles that all high-voltage tests must adhere to.

Personnel Qualifications and Protection

Operators must undergo professional training and be familiar with instrument performance and emergency procedures.

Wear qualified insulating gloves (withstand voltage ≥10kV) and insulating shoes (withstand voltage ≥6kV). Metal jewelry is prohibited.

Long hair should be tied up to avoid contact with live parts during operation.

Testing Environment Control

The testing site should be dry and well-ventilated, with a relative humidity ≤85%. Operation is prohibited in rainy weather or on damp ground without an insulating mat.

Set up "High-Voltage Testing, Do Not Approach" warning signs and designate a safety cordon. Unauthorized personnel are prohibited from entering this area.

Keep away from strong electromagnetic interference sources (such as large transformers and frequency converters) to prevent signal interference leading to misjudgments.

Equipment grounding must be reliable.

Both the test instrument and the device under test must be reliably grounded, with a grounding resistance ≤ 4Ω, to prevent electric shock caused by induced voltage or leakage.

The wiring sequence must be: connect the grounding wire first, then the disconnect wire, to prioritize establishing a discharge circuit and protect the instrument and personnel.

Power supply and connection checks:

Confirm that the power supply voltage matches the instrument requirements (usually AC 220V±10%), and the power socket must have reliable grounding.

Avoid short-circuiting the test instrument's output ground wire to the AC power cord; otherwise, the casing may carry high voltage, which is extremely dangerous.