Megger LTW315 User Manual

M
LTW300 Series
Earth Loop testers
User Guide

Megger LTW315 Specifications

General

Display	LCD
Continuity resolution	0.01Ω
Frequency	50/60 Hz
Type	Loop Impedance/Continuity Tester
Continuity range	0.01 Ω to 2000 Ω
Loop impedance range	0.1 Ω to 2000 Ω
PSC range	1A to 20kA
Accuracy	±2% ±2 digits
Power Supply	Battery
Dimensions	200 x 100 x 50 mm
Safety Standards	EN61010-1, EN61557

Summary

Safety Warnings and Precautions

Symbols Used on the Instrument

Explains instrument symbols for safety and compliance.

Connection Panel

Preparations for Use

General Operating Instructions

Test Lead Connection

Details on connecting the instrument's test leads for various tests.

Loop Testing Methods

No-Trip Test Description

Details the no-trip test method for RCD-protected circuits.

Performing a Loop Test

No-Trip Testing with Mains Socket Lead

Step-by-step guide for no-trip tests using the mains socket lead.

High Current Loop Test

High Current Phase to Earth Test

Procedure for performing a high current phase-to-earth loop test.

High Resolution Loop Test

Prospective Fault Current (PFC)

Possible Sources of Error

Deriving R1+R2 Value

Measuring Zref

Measuring R1+R2

Voltage and Frequency Measurement

Phase to Earth/Neutral Voltage Measurement

How to measure voltage and frequency for phase-to-earth/neutral.

Storing and Downloading Test Results (LTW335)

Downloading Results to PC

SETUP Menu Configuration

Warning and Status Messages

Loop Test Inhibit/Termination

Explains conditions that stop or prevent loop tests from running.

Replacing Batteries and Fuses

Battery Replacement Procedure

Step-by-step guide for safely replacing the instrument's batteries.

Technical Specifications

General Specification

Provides general technical data, ranges, and accuracy for the instrument.

Repair and Warranty

Calibration, Repair, and Spare Parts

Contact information and procedures for instrument service and parts.