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Measuring Instruments
COMBI421
User manual
HT COMBI421 User Manual
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Contents
Table of Contents
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Table of Contents
Table of Contents
Safety Precautions and Procedures
Preliminary Instructions
During Use
After Use
Overvoltage Categories - Definitions
General Description
Introduction
Instrument Operation
Preparation for Use
Initial Checks
Instrument Power Supply
Calibration
Storage
Nomenclature
Instrument Description
Backlighting
Keyboard Description
Display Description
Initial Screen
Main Menu
Auto ÷ Pwr
SET - Instrument Settings
Language
Auto Power off
Nominal Voltage
Frequency
System
Mem
Rs232
Operating Instructions
Auto
Description of Anomalous Results
LOWOHM: Continuity Test of Earth Leads with 200Ma
CAL Mode
Description of Anomalous Results
M: Measurement of the Insulation Resistance
Description of Anomalous Results
RCD: Test on A-Type and AC-Type Rcds
AUTO Mode
Mode
X1, X2, X5 Mode
Mode
RA Mode
Description of Anomalous Results
LOOP: Measurement of Line/Loop Impedance
P-N Mode
P-P Mode
P-PE Mode in TT or TN Systems
P-PE Mode in IT Systems
Description of Anomalous Results
R a : Measurement of the Total Earth Resistance through the Socket-Outlet
Description of Anomalous Results
123: Phase Sequence Test
Description of Anomalous Results
AUX: Real Time Measurement of the Environmental Parameters
AIR, RH, TMP °F, TMP °C, Lux Mode
Description of Anomalous Results
LEAK: Real Time Measurement of the Leakage Current through an External Clamp
Description of Anomalous Results
Mains Analysis
PWR: Real Time Measurement of the Mains Parameters
PAR Mode
HRM V Ane HRM I Mode
Memory
How to Save a Measure
Description of Anomalous Results
Saved Data Management
How to Recall a Measure
How to Delete the Last Measure or All of Them
Description of Anomalous Results
Connecting the Instrument to the Pc
Maintenance
General
Battery Replacement
Instrument Cleaning
End of Life
Specifications
Technical Feratures
Reference Guidelines
General
Reference Standards for Verification Measurements
General Characteristics
Environment
Environmental Working Conditions
Accessories
Service
Warranty Conditions
Practical Reports for Electrical Tests
Continuity Measurement on Protective Conductors
Purpose of the Test
Installation Parts to be Checked
Allowable Values
Insulation Resistance Measurement
Purpose of the Test
Check of the Circuit Separation
Definitions
Purpose of the Test
Installation Parts to be Checked
Allowable Values
Working Test of RCDS
Purpose of the Test
Installation Parts to be Checked
Allowable Values
Note
Test of RCD Tripping Current
Purpose of the Test
Installation Parts to be Checked
Allowable Values
Note
Measurement of Short-Circuit Impedance
Purpose of the Test
Installation Parts to be Checked
Allowable Values
Fault Loop Impedance Measurement
Earth Resistance Measurementin TT Systems
Purpose of the Test
Installation Parts to be Checked
Voltage and Current Harmonics
Theory
Limit Values for Harmonics
Presence of Harmonics: Causes
Power and Power Factor Definition
Presence of Harmonics: Consequences
Note
Conventions on Powers and Power Factors
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Copyright HT ITALIA 2014
Release EN 2.02 - 24/09/2014
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Summarization of Contents
Safety Precautions and Procedures
Preliminary Instructions
Instructions to follow before using the instrument for the first time.
During Use
Recommendations and instructions for safe operation of the instrument.
After Use
Procedures for turning off and storing the instrument after measurements.
Overvoltage Categories Definitions
Explanation of measurement categories (overvoltage categories) as per IEC/EN61010-1.
General Description
Introduction
Overview of the instrument models and measurement functions.
Instrument Operation
Description of the tests the instrument can perform.
Preparation for Use
Initial Checks
Procedure for checking the instrument for damage after transport.
Instrument Power Supply
Information on battery type, life, and replacement.
Calibration
Details on instrument calibration and warranty period.
Storage
Guidelines for storing the instrument to ensure accurate measurements.
Nomenclature
Instrument Description
Identification of the instrument's parts and connectors.
Backlighting
Information on activating and managing the display backlighting.
Keyboard Description
Explanation of the function of each key on the instrument.
Display Description
Description of the graphical display and its indicators.
Initial Screen
Details displayed when the instrument is turned on.
Main Menu
AUTO + PWR
Accessing measurement functions directly from the main menu.
SET - Instrument Settings
Configuration options for language, auto power off, voltage, etc.
MEM
Accessing the memory management functions.
RS232
Enabling data transfer to a PC.
Operating Instructions
AUTO
Performing automatic sequence of tests: earth resistance, RCD, insulation.
LOWOHM: Continuity Test of Earth Leads with 200mA
Measuring continuity of protective/equipotential conductors.
ΜΩ: Measurement of the Insulation Resistance
Measuring insulation resistance between active conductors and earth.
RCD: Test on A-Type and AC-Type RCDs
Testing tripping time and current of RCDs.
LOOP: Measurement of Line/Loop Impedance
Measuring line/loop impedance and prospective short circuit current.
RA: Measurement of Total Earth Resistance Through the Socket-Outlet
Measuring total earth resistance via socket-outlet.
123: Phase Sequence Test
Testing the phase sequence by direct contact.
AUX: Real Time Measurement of the Environmental Parameters
Measuring environmental parameters using external probes.
LEAK: Real Time Measurement of the Leakage Current Through an External Clamp
Measuring leakage current using an external clamp.
Mains Analysis
PWR: Real Time Measurement of the Mains Parameters
Measuring voltage, current, power, and harmonics of mains.
Memory
How to Save a Measure
Procedure for saving measured data.
Saved Data Management
Recalling, deleting, and managing stored measurements.
Connecting the Instrument to the PC
Maintenance
General
General recommendations for using and storing the instrument.
Battery Replacement
Procedure for replacing the instrument's batteries.
Instrument Cleaning
Instructions for cleaning the instrument.
End of Life
Information on proper disposal of the equipment.
Specifications
Technical Features
Technical specifications and performance data for measurements.
Reference Guidelines
Safety and technical documentation standards compliance.
General Characteristics
Mechanical data, power supply, and display information.
Environment
Environmental conditions for instrument operation and storage.
Accessories
List of included accessories.
Service
Warranty Conditions
Details on warranty coverage and exclusions.
Service
Procedures for troubleshooting and returning the instrument.
Practical Reports for Electrical Tests
Continuity Measurement on Protective Conductors
Procedure for checking continuity of protective conductors.
Insulation Resistance Measurement
Measuring installation insulation resistance against standards.
Check of the Circuit Separation
Testing insulation resistance for SELV, PELV, and electrical separation.
Working Test of RCDs
Checking RCD installation, adjustment, and features over time.
Test of RCD Tripping Current
Checking the real tripping current of general RCDs.
Measurement of Short-Circuit Impedance
Checking protection device tripping power against fault current.
Fault Loop Impedance Measurement
Measuring fault loop impedance and prospective fault current.
Earth Resistance Measurement in TT Systems
Checking RCD coordination with earth resistance value.
Voltage and Current Harmonics
Theory, limit values, causes, and consequences of harmonics.
Power and Power Factor Definition
Definitions and formulas for electrical power and power factor.
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