The Fluke 1630-2 FC is an earth loop clamp meter specifically designed for measuring earth loop resistance in multi-grounded systems. The device is suitable for applications in commerce, industry, and power supply companies. It enables measurement of earth loop resistance and AC leakage currents without interrupting the circuit, making testing in live installations safe and efficient. Its compact and robust design makes it suitable for use in confined spaces and under challenging environmental conditions. The integrated continuity test function with acoustic alarm, as well as the ability to hold the display value (Display Hold), supports practical and comfortable operation.

Applications
The Fluke 1630-2 FC is used in areas where reliable earth loop testing is required, particularly in industrial facilities, power supply networks, or buildings where traditional earth stakes cannot be used. The stakeless testing method allows measurements to be performed at locations where installing earth stakes is not possible or practical, such as on power poles or indoors. The measurement is carried out without disconnecting parallel deep earth electrodes, saving time and making the testing process faster and safer.

Functions and Features in Detail
The device uses a stakeless testing method, where the clamp is placed directly on the deep earth electrode or connection cable. A known voltage is induced through half of the clamp, while the other half measures the flowing current. Based on these values, the device automatically calculates the earth loop resistance. At least two earth connections on the system under test are required for this measurement method to close the current path of the induced voltage. Additionally, the device can measure AC leakage currents without interrupting the circuit. The Display Hold function allows fixing a measurement value on the display, for example, during documentation or testing.

Technology Explained Simply
The technology of the Fluke 1630-2 FC is based on inductive voltage excitation and current measurement via the clamp. This eliminates the need to drive additional earth stakes into the ground, making testing faster and more flexible. The measurement is performed in the frequency range of 40 Hz to 1 kHz, which is sufficient for most industrial and commercial applications. The maximum voltage to ground is 1000 V, and the device is approved for measurement categories CAT IV 600 V and CAT III 1000 V, ensuring safe use in electrical installations. The IP30 protection rating with the clamp closed protects against solid foreign objects, but not against water or dust.

Compatibility and Accessories
The device is compatible with the wireless Fluke-Connect system, enabling transmission and storage of measurement data. Data can be stored, transmitted, and shared via the Fluke-Connect system, simplifying documentation and analysis of measurement results. The integrated data logging function stores at least 32,760 measurement values, with the logging interval adjustable between 1 second and 59 minutes 59 seconds. This enables detailed long-term monitoring of grounding systems.

Installation and Mounting
Installation is done by directly placing the clamp on the deep earth electrode or connection cable. No additional grounding or mechanical connection is required. The robust jaws remain properly aligned and calibrated even with frequent use in industrial environments. The operating temperature of the device ranges from −10 °C to +50 °C, allowing use in a wide variety of environments. Power is supplied by 4 AA alkaline batteries (IEC/EN LR6), providing an operating time of over 15 hours.

Operational Advantages
The Fluke 1630-2 FC offers a fast and safe method for testing earth loop resistance without interrupting the circuit. The stakeless technology reduces testing time and eliminates the need to install additional earth stakes. The integrated data logging function and wireless data transmission via Fluke Connect simplify documentation and analysis of measurement results. The robust construction and high operational reliability make the device a reliable solution for professional users in electrical engineering.