Key facts
- Brand
- EXTECH
- Model
- 400 Series
- Category
- multimeter
- Documents
- 3
- Languages
- ZH · EN
- Last added
- 2026-10-07
Start here
Extech 7400 Series Safety Analyzer Operation Manual
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.
EXTECH 400 Series specifications
| 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 |
All EXTECH 400 Series documents by type
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What safety class does the analyzer comply with?
The instrument complies with Safety Class I, which includes a protective grounding terminal.
Which input voltages can be selected for the analyzer?
The user can select either 115 V or 230 V input voltage.
Which models in the 400 Series have a built-in IR Thermometer?
The EX450 and EX470 models offer a built-in InfraRed Thermometer.
What is the low current measurement capability?
The meters can measure down to 0.1μA.
What is the distance‑to‑target ratio of the IR thermometer?
The IR thermometer has an 8:1 distance‑to‑target ratio.
From: Extech 400 Series Multimeter + IR Thermometer Datasheet
What temperature range can the IR thermometer measure?
It measures from –4 °F to 1382 °F (–20 °C to 750 °C).
From: Extech 400 Series Multimeter + IR Thermometer Datasheet