Megger LTW425 High Resolution Loop Tester

The Megger LTW425 Loop Impedance Tester is three phase safe and category IV 300V rated, making it suitable for use on supplies from 50V to 300V AC single phase, as well as on 440V three phase installations. The LTW425 Tester automatically averages a large number of results over the duration of the test. This enables non trip testing to be performed without DC injection, a technique which is, in any case, proving ineffective with electronic RCDs. The LTW425 offers a high current high resolution loop test to three decimal places. This is ideal for establishing the correct Ze on an incoming supply, especially on PME installations. Results of this test can also be used to calculate higher PFC results. FEATURES 2 Wire Non-tripping loop tester. 50 V to 440 V operation. 110 V centre-tap loop testing. CATIV installation testing. AUTO start - operation. 0.01 Ω resolution. Megger LTW Summary Chart Function LTW315 LTW325 LTW335 LTW425 2-Wire Non Tripping Loop Testing 2-Wire Fast Test (High Current) 110V to 280V Applications 50V to 440V Applications - Phase to Phase Testing - 20KA PFC Range 40KA PFC Range - - - 0.01Ω Resolution 0.001Ω Resolution - - - AUTO Noise Detection AUTO Start Loop Test Voltage Measurements Frequency Measurements Max Zs Display - R2+R2 Display - Backlit Display (White Light) Built-In Front Cover (Foldaway) IP54 Weatherproof Case Accepts Rechargeable Batteries Test Result Storage - - - Downloading Test results - - - Test Lead Set with Crocs Mains Socket Test Lead Full Calibration Certificate Megger LTW425 Specifications Accuracy All accuracy statements are based on: Ambient Temperature 23° +2°C. Nominal Voltage Source 230 V a.c +1%. Voltage Measurements (ac only) 50 V to 440 V. Accuracy +2% +1 V. Frequency Measurements Range 25 Hz to 99.99 Hz. Accuracy +0.1 Hz. A warning will be shown if applied voltage exceeds 440 V. Damage will occur if applied voltage exceeds 600 V rms. Loop Testing Accuracy +5% +0.03 Ω @230 V a.c. +/-10% +/-0.02 ohms @100 V a.c and 280V a.c. +10% +0.03 Ω @100 V a.c and 300V a.c. +15% +0.03 Ω @50 V a.c. No Trip Loop and High Current Loop Test Source Voltage 50 V to 440 V (49 Hz to 50.1 Hz). Display Range 0.01 to 2000 Ω. Accuracy +5% + 0.03 Ω. No Trip Loop Test Nominal Current 15 ma (at nominal 230 V a.c supply). High Current Loop Test 4 A (at nominal 230 V a.c supply). Operational Range 0.30 to 1000 Ω. High Resolution Loop Test Source Voltage 50 V to 440 V (50 Hz). Display Range 0.001 Ω to 2000 Ω. Accuracy +5% +0.01 Ω. Nominal Test Current 4 A at nominal 230 V supply. Operational range 0.30 Ω to 1000 Ω. Prospective Fault Current (PFC) Prospective Fault Current =Measured Source Voltage/Loop Resistance. Maximum Range No Trip Mode: 20 KA. Accuracy is derived from loop test and voltage measurement. Safety IEC 61010 Designed to IEC61010-1 Designed for 300 volts to Earth Category IV with phase to phase voltages to 440V. Fuse protected to 600 volts rms AC. EN61557 Complies with the following parts of EN61577: Electrical Safety in Low Voltage Systems up to 1000V ac and 1500V dc - Equipment for testing, measuring or monitoring of protective measures: Part 1: General Requirements. Part 3 - Loop Resistance E.M.C In accordance with IEC61326-1. Power Supply Battery 8 x 1.5V Cells IEC LR6 Type (AA Alkaline). Rechargeable 8 x 1.2V NiCd or NIMH Cells. Battery Life 2000 consecutive tests. Mechanical Weight 1000g +10% excluding test leads. Dimensions 203 x 148 x 78 mm.

For more information on Megger LTW425 High Resolution Loop Tester talk to Cuthbertson Laird Group