F404T – AC/DC multifunction clamp meter for photovoltaic systems with patented AutoCheck function
The F404T is an AC/DC multifunction clamp meter specifically designed for work on photovoltaic systems. It reliably verifies the absence of DC current in module strings, providing the basis for safe working conditions before any intervention on the system. Its key advantage: the patented AutoCheck function allows the correct operation of the clamp meter to be verified before the actual current-free test is performed.

When opening a string that continuously carries direct current, there is a risk of an electric arc that can endanger personnel and cause considerable damage to equipment. An incorrectly configured or defective standard clamp meter may falsely indicate that no current is flowing, creating an additional safety hazard. The F404T addresses this risk with an integrated self-test function that confirms the correct operation of the clamp meter in three simple steps before each test. In addition, its 12-bit TRMS acquisition method covers a broad measurement range for AC and DC currents and voltages, while a type K thermocouple supports spot temperature monitoring on photovoltaic modules.

Your benefits at a glance

• Patented AutoCheck function for reliable verification of the absence of current before any intervention
• The AutoCheck function confirms correct clamp operation before each measurement, ensuring reliable current-free testing on PV strings
• DC measuring ranges up to 1700 V and 1500 A reliably cover the requirements of modern photovoltaic systems
• Safety category 1000 V CAT IV / 1500 V CAT III meets the highest requirements
• High measurement accuracy thanks to fast digital 12-bit TRMS acquisition, even with highly distorted signals
• Robust IP54 housing with standards-compliant drop resistance from a height of 2 metres, suitable for demanding field conditions
• Type K thermocouple enables spot temperature measurements on photovoltaic modules without an additional instrument

Typical applications

• Verification of the absence of DC current before maintenance and repair work on photovoltaic systems
• Replacement of modules, connectors or defective cables in PV strings
• Work on inverters or fuses in solar power systems
• Monitoring the operation of a photovoltaic system during normal operation
• Temperature measurements on the rear side of photovoltaic modules

Technical highlights

• DC current range up to 1500 A, AC current range up to 1000 A (1500 A peak)
• DC voltage range up to 1700 V, AC voltage range up to 1200 V (1700 V peak)
• IP54 protection rating, clamping diameter 48 mm
• Type K temperature measurement from -60.0 °C to +1000 °C
• Additional functions: Min/Max, ΔREL, True Inrush, adapter function and automatic power-off

Scope of delivery

• 1 set of PVC test leads with angled and straight Ø 4 mm safety plugs, length 1.5 m, CAT IV 1000 V – CAT III 1500 V, 15 A
• 1 set of 2 test probes with insulated Ø 4 mm socket, CAT IV 1000 V – CAT III 1500 V, 15 A
• 1 set of PVC test leads with Ø 4 mm safety plug/type MC4 connector (socket and plug)
• 1 wire thermocouple with insulated Ø 4 mm safety plugs, 19 mm spacing
• Tools for solar connectors
• 4 alkaline AA batteries, 1.5 V
• 1 printed quick-start guide in 5 languages
• 1 MultiFix carrying case

Technical data