Digital multimeter Voltcraft AT-400 — handheld measuring instrument, CAT IV 600 V safety rating

The Voltcraft AT-400 is a compact digital handheld multimeter designed for electrical measurement tasks requiring robust transient protection. With a CAT IV 600 V safety rating, the instrument supports measurements of DC and AC voltage, current, and resistance in both professional and domestic environments. Its portable design makes it suitable for on-site troubleshooting and inspection of electrical installations where higher overvoltage categories are expected.

Advantages

The device combines a high safety rating with a clear numeric display and straightforward control layout, allowing users to perform common diagnostics quickly. Mechanical housing and input protection are engineered to reduce risk when measuring in distribution panels and near service entries. Compact dimensions and battery operation enable convenient transport and use in confined spaces or at remote locations.

Suitable for

• Electrical distribution panel inspection and maintenance
• Field service troubleshooting for residential and commercial sites
• Measuring DC and AC voltage and current during installations
• Basic resistance and continuity checks on wiring and components

Key specifications

• Safety rating: CAT IV 600 V for enhanced transient protection
• Functions: DC/AC voltage, DC/AC current, resistance, continuity
• Display: digital numeric readout for clear measurement values
• Power supply: battery-operated for portable use
• Form factor: handheld, compact and lightweight for field work

How to use

Select the required measurement function and range (or auto-range if available), connect the test leads to the appropriate input jacks and probes, and place the probes on the circuit or component under test. Observe the display and any polarity or range indicators. Always disconnect power where practical before measuring resistance or continuity. When measuring live circuits, keep a safe grip on insulated probe handles and follow the specified safety rating limits.

Recommendations

Verify test lead condition before use, avoid exceeding the CAT IV 600 V boundary, and follow local electrical safety regulations. Use personal protective equipment when working near exposed conductors and perform regular battery and calibration checks to maintain reliable readings.