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HT COMBI420 User Manual

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Copyright HT ITALIA 2012 Release EN 1.07 - 05/06/2012
400 Series
User manual
ISO410 - SPEED418 - COMBI419 - COMBI420

Table of Contents

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HT COMBI420 Specifications

General IconGeneral
Continuity TestYes
Diode TestYes
Data HOLDYes
MAX/MINYes
Auto Power OFFYes
BacklightYes
Display4000 counts
StandardIEC/EN61010-1
SafetyCAT III 600V
Operating Temperature0°C

Summary

Safety Precautions and Procedures

Preliminary Instructions

Initial checks and safety guidelines before using the instrument.

Overvoltage Categories

Definitions and implications of different overvoltage categories for measurements.

Operation Description

Instrument Description

Detailed overview of the instrument's physical components and controls.

Keyboard Description

Description of the function of each key on the instrument's keypad.

Main Menu

Set - Instrument Settings

Configuration options for language, auto power off, voltage, and system.

Electrical System Test

AUTO Test

Automatic sequence for earth resistance, RCD tripping, and insulation.

LOWOHM Continuity Test

Measuring continuity of protective and equipotential conductors.

ΜΩ Insulation Resistance

Measuring insulation resistance at various test voltages.

RCD Test

Testing general and selective RCDs for tripping time and current.

LOOP Impedance Measurement

Measuring line/loop impedance and calculating fault current.

POWER Mains Analysis

Measuring voltage, current, power, and harmonics.

AUTO Test Procedure

Parameter Selection

Selecting and modifying test parameters like IdN, RCD type, UL, and VNom.

LOWOHM Continuity Test Results

CAL Mode Procedure

Steps for calibrating test cables for accurate measurements.

ΜΩ Insulation Resistance Test Procedure

Parameter Configuration

Setting Func, VNom, Lim, and Temp parameters for the test.

RCD Test on A-type and AC-type RCDs

Operating Modes

Explanation of AUTO, x1/2, x1, x2, x5, and RA modes for RCD testing.

LOOP Impedance Measurement

Operating Modes

Explanation of P-N, P-P, and P-PE modes for impedance testing.

AUXILIARY Measurements

Overview of Environmental Parameters

Measuring air speed, humidity, temperature, dB, Lux, and voltage.

LEAK: Real Time Leakage Current

Measurement Setup

Connecting the clamp for indirect or direct leakage current measurement.

MAINS ANALYSIS: Power Measurement

Overview of PWR Modes

Explanation of PAR, HRM V, and HRM I modes for mains analysis.

MEMORY: Saving Measures

How to Save a Measure

Procedure for saving measurement data using the SAVE key.

Maintenance

Battery Replacement

Procedure and precautions for replacing the instrument's batteries.

Specifications

Technical Features (Continuity, Insulation, RCDs)

Detailed specifications for continuity, insulation, and RCD tests.

Safety Specification

Electrical safety ratings and compliance standards.

Service

Warranty Conditions

Terms and conditions for instrument warranty coverage.

Practical Reports for Electrical Tests

Continuity Measurement on Protective Conductors

Purpose, parts to check, and allowable values for continuity tests.

Insulation Resistance Measurement

Purpose and procedure for insulation resistance tests.

Practical Reports (Continued)

Working Test of RCDs

Checking the proper functioning of general and selective RCDs.

Practical Reports (Continued)

Test of RCD Tripping Current

Verifying the real tripping current of RCDs.

Practical Reports (Continued)

Fault Loop Impedance Measurement

Measuring fault loop impedance and prospective fault current.

Practical Reports (Continued)

Voltage and Current Harmonics

Understanding voltage/current harmonics and their effects.

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