Red Phase 4025D

Frequency selective multimeter

The Model 4025D 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 easily and accurately, which is important for the safety of both the general public and utility personnel. The Model 4025D is designed for portable use in the field; powered via an internal rechargeable battery.

Key Features

• Frequency range: 40 - 69 Hz
• Frequency increment: 1 Hz
• Linearity Error: < 1%
• Magnitude Error: < 1%
• Phase Error: < 1 degree max, +/- 3 counts typ.
• Noise overload level: +17.5dB typically above full scale
• Maximum power consumption 3.5 Watts
• LCD backlight consumption 1.3 Watts

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Red Phase 4023 & 4024

Injection unit & Coupling Transformer

The Model 4024B is a switch mode voltage source that is used with the Model 4023 Coupling Transformer to produce a high current low voltage or high voltage low current in an earth loop.

The current from the Model 4023 is coupled into the earth loop being investigated via a selectable multi-tap output. In most cases the operator will try to inject the maximum current into the earth loop being tested since that gives maximum signal for the Model 4025. For that reason the 4023 has tap settings for earth loop impedances from 0.5 OhmS to 40 OhmS which covers most test situations.

Key Features

• The Model 4024B has a 160 X 128, LED back-lit graphical LCD and a keyboard
• The software enables automatic or manual ramping from zero to maximum current in any tap setting, and ramping down to zero
• The software will prompt the operator to change tap settings if maximum current is not attained
• LEDs are located on the front panel to show error conditions and when the target output is reached
• The 4024B mains input is protected with a magnetic circuit breaker

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Megger DET4TC2

Soil resistivity testing

The instrument is easy to use with a large rotary selector switch and one-press test button, both of which permit operation with gloved hands. Unlike some instruments, the design negates the need for a shorting link when making two pole measurements.

There are no hidden functions with the instrument: clearly labelled auxiliary controls are used to select the test frequency (94 Hz, 105 Hz, 111 Hz and 128 Hz), output voltage (50 V or 25 V where local standards apply) and to switch the backlight on or off.

Key Features

• 2, 3 and 4 point testing
• Stakeless or clamp-on testing option
• ART (Attached Rod Technique) capability
• Multiple, user selectable test frequencies
• Resistance measurement range to 200 kΩ
• IP54 rated
• Warning indicators prevent test failure
• Simple one button operation
• Included leads, stakes, calibration certificate and rugged carry case

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