Overview
The Megger LTW425 two wire earth loop tester verifies the loop impedance of a live electrical circuit, ie without the need to disconnect the electrical supply. The instrument also offers a 2 wire loop testing solution that does not trip 30 mA RCD's and can be used on a wide range of voltages.
Features
- 2 Wire Non-tripping loop tester
- 50 V to 440 V operation
- 110 V centre-tap loop testing
- Backlight display
- CATIV installation testing
- AUTO start - operation
- High resolution (0.001Ω) 2 wire testing + maxZ + (R1+R2)
Technical
Voltage measurement
AC 50V to 440V
Voltage accuracy ±2% ±1V
Voltage range 25Hz to 99.99Hz
Voltage accuracy ±0.1Hz
No-trip loop and high current loop test
Source voltage 50V to 440V (50Hz)
Display range 0.01Ω to 2000Ω
Accuracy ±5% ±0.03Ω
Nominal test current No-Trip loop test 15 mA (at nominal 230Vac supply) High current loop test 4 A (at nominal 230 Vac supply)
Operational range 0.30Ω to 1000Ω
High resolution loop test
Source voltage 50 V to 440 V (50Hz)
Display range 0.001Ω to 2000Ω
Accuracy ±5% ±0.01Ω
Nominal test current 4A at nominal 230V supply
Operational range 0.30Ω to 1000Ω
Prospective Fault Current (PFC)
Prospective fault current Measured Source Voltage / Loop resistance
Maximum range 40 kA; accuracy is derived from loop test and voltage measurement.
Battery life 2000 consecutive tests
Weight 1kg approximately excluding test leads
Dimensions 203 x 148 x 78 mm