Red Phase 4025D and Recoil 545

The Red Phase 4025D and Recoil 545 Tunable Multimeter is a frequency-selective ammeter and voltmeter used to measure the magnitude and phase angles of signals produced by the Model 4024/4024B Injection Units. The voltmeter part of the 4025D allows touch and step voltages to be measured quickly and accurately, which is essential for the safety of both the general public and utility personnel. The current input is used explicitly with a (Rogowski) Type 545 worm coil or a LEM~flex RR3020 AC probe.

The Rogowski coil and LEM current probe are optional accessories. These are very convenient current measuring devices that can be simply wrapped around current-carrying structures. The ability to measure currents in various structures is crucial for tracking Earth currents during investigations. Utility engineers need an accurate picture of the earth currents flowing in substations, power stations and similar large installations when designing protection systems. The multimeter operates in the 40–69 Hz range, catering to both 50 Hz and 60 Hz power frequencies. The high quality of the multimeter’s filters allows it to be used at frequencies up to a limit of 1Hz from the power frequency and still reject power frequency interference. The Model 4025D is designed for portable use in the field — powered by an internal rechargeable battery.

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• Versatile Frequency Range

Measures magnitudes and phase angles of signals across a frequency range of 40–69 Hz, suitable for 50 Hz and 60 Hz systems.

• Enhanced Safety Testing

Accurately measures touch and step voltages, critical for ensuring safety in public and utility environments.

• Portable Design

Powered by a rechargeable lithium-ion battery with 8 hours of life, ideal for field operations.

• Precision Filtering

High-quality filters reject interference, operating effectively up to 1 Hz away from the power frequency.

• User-Friendly Operation

Features an LCD screen, intuitive push-button controls, and front-panel LEDs for error indication and confirmation of target outputs.

Operation: Front LCD screen with push buttons.

Operating temperature range: 0 °C … +35 °C

Nominal temperature range: 18 °C … +28 °C

Storage temperature range: -30 °C … +60 °C

Battery life span: Lithium Ion Battery with 8 hours of battery life

Weight: 6kg

• Increased operational safety and compliance in utility and public spaces.
• Portable and easy-to-use design for field applications.
• Accurate and reliable measurements to support advanced engineering analyses.
• Flexible use with optional accessories like the Recoil 545 or LEM current probes.
• Long-lasting battery life to meet the demands of on-site testing.

• Utility Grid Analysis

Provides utility engineers with accurate earth current measurements in substations, power stations, and similar installations, helping in designing reliable protection systems.

• Safety Compliance Testing

Ensures environments meet safety standards by measuring touch and step voltages, safeguarding the public and personnel.

• Electrical Fault Diagnosis

Identifies electrical faults in grids by measuring signal magnitudes and phase angles, aiding in locating and resolving issues efficiently.