The Extech 7400 series safety analyzer operation manual provides safety rules, installation steps, specifications, and calibration procedures.
This manual describes the Extech 7400 series safety comprehensive analyzer (models 7410, 7420, 7430, 7440). It covers safety symbols, technical terminology, installation, detailed technical specifications, front‑ and rear‑panel descriptions, operation keys, interface options, and calibration procedures.
The document also includes warranty information, service contacts for Taiwan, China, and Malaysia, and detailed calibration steps for DC current, insulation resistance, and ground‑impedance measurements. This manual is written in Chinese.
| Input voltage | 115 V or 230 V |
|---|---|
| Safety class | Class I |
| DC calibration current range | up to 3500 µA |
| Ground‑impedance test voltage | ≈ 7 VAC |
| Ground‑impedance test current | ≈ 30 A |
The instrument complies with Safety Class I, which includes a protective grounding terminal.
The user can select either 115 V or 230 V input voltage.
Enter the desired current value with the numeric keys and press ENTER; for example, DC 3500 µA is entered for calibration.
The analyzer outputs approximately 7 VAC during ground‑impedance voltage calibration.