METREL MD 9272 Manual de usuario

Leakage Clamp TRMS Meter with

Power Function

MD 9272

Instruction manual

Bedienungsanleitung

Version .1.8; Code 20 752 381

Distributor:

METREL d.d.

Ljubljanska cesta 77

1354 Horjul

Slovenia

E-mail: metrel@metrel.si

web site: http://www.metrel.si/

Metrel GmbH

Mess und Prüftechnik

Orchideenstrasse 24

90542 Eckental -Brand

Germany

E-mail: metrel@metrel.de

Internet: http://www.metrel.de/

Metrel UK

Test & Measurement

Unit 16, 1st Qtr Business Park Blenheim Road

Epsom

Surrey

KT19 9QN, GREAT BRITAINE-mail: info@metrel.co.uk

Internet: http://www.metrel.co.uk/

Mark on your equipment certifies that this equipment meets the requirements of all

EU (European Union) related regulations.

No part of this publication may be reproduced or utilized in any form or by any means without

permission in writing from METREL.

MD9272 Leakage Clamp TRMS Meter with Power Function Table of contents / Inhalt

English

1. General Instructions.....................................................................................................4

2. Instrument Description.................................................................................................6

3. Description of Functions............................................................................................11

4. Data Retention Mode.................................................................................................19

5. Technical Specifications ............................................................................................20

6. Maintenance..............................................................................................................23

Deutsch

1. Allgemeine Anweisungen ..........................................................................................25

2. Gerätebeschreibung ..................................................................................................27

3. Beschreibung der Funktionen....................................................................................32

4. Datenspeicherungsmodus.........................................................................................39

5. Technische Daten......................................................................................................40

6. Wartung.....................................................................................................................43

MD9272 Leakage Clamp TRMS Meter with Power Function General Instructions

1. General Instructions

This instrument has been designed in accordance with IEC 61010 series standards that

regulates safety requirements for the electronic measuring equipment and current

measuring clamps. Present user manual shall be read carefully in order to get the best

out of this equipment. Safety instructions shall always be complied.

Safety measures

General

•If the clamp-meter is used in a manner not specified in this user’s manual, the

protection provided by the equipment may be impaired!

•This equipment can be used to carry out measurements in the CAT.III1600V

environment.

•When using this clamp meter, the user should comply with all the safety measures

regarding:

- Protection against the electric current hazards.

- Protection of the clamp A-meter against incorrect use.

- Protection against electric shock hazard.

•For operator security, only the test probes supplied with the instrument shall be

used.

Do not use the clamp-meter and its accessories if any damage is noticed!

During use

•Before carrying out any measurements, the instrument shall be warmed up for at

least 30 seconds.

•If the clamp-meter is used near any high level noise generating equipment, the

screen might become unstable or show errors of importance.

•The maximum limits of the input values shown on the technical specifications

tables shall not be exceed to avoid damage to the equipment.

•The rotary switch shall be in the correct position before starting a new

measurement.

•Working near bare conductors or busbars shall be extremely careful.

•Any accidental contact with the bare conductor may cause an electric shock.

•Working with voltages higher than 60V d.c. or 30V a.c. r.m.s shall be careful to

avoid a risk of electric shock.

•The test probe(s) shall be disconnected from the circuit that is being tested before

changing the function.

•During measurement fingers shall always be kept behind the protection guard

(check point 2 of this manual)

•the battery shall be changed when the symbol is shown in order to avoid

incorrect measurement readings.

(1): Measurement category III is for measurements performed in the building installation. Examples are

measurements on distribution boards, circuit-breakers, wiring, including cables, bus-bars, junction boxes,

switches, socket-outlets in the fixed installation, and equipment for industrial use and some other

equipment, for example, stationary motors with permanent connection to the fixed installation.

MD9272 Leakage Clamp TRMS Meter with Power Function General Instructions

Symbols

The symbols used in this manual and in the equipment are as follows:

Warning: check the instruction manual. Any incorrect use may cause damage to the

equipment or its components.

Earth

Complies with European Union Directives.

This equipment has double insulation.

Allows use with dangerous voltage conductors.

Instructions

•Before opening the equipment, the instrument shall be disconnected from any

source of electricity supply and shallbe ensured that the operator isfree from static

electricity, as this could destroy the internal components.

•Before using this equipment it shall be checked for proper operation; by turning

the rotary switch to A or V position and verification a double beep and the display

activity.

•Any adjustment or repair or maintenance work on the clamp A-meter must only be

carried out by a qualified person, always taking into account the instructions

included in this manual.

•A “qualified person” means somebody familiar with the installation, construction

and operation of the equipment, and with the risks implied. This person should be

trained and authorized to charge and discharge energy from the circuits and the

equipment in accordance with established practice.

•When the equipment is open, some internal components can retain dangerous

power, even after the equipment has been disconnected from the mains electricity

supply.

•In the case of abnormal operation and/or performance, the equipment shall not be

used until it has been repaired/verified.

•The battery shall be removed from the clamp-meter if it is not going to be used for

a long period, and shall not be stored in a high temperature or humid environment.

WARNING

This equipment is designed according to EMC standards for portable measuring and test

instruments. Anyway, it is recommended to disconnect the test leads during current

measurements, as a high radiation radiofrequency electromagnetic field might be

present, which can negatively affect the accuracy of the measurement.

MD9272 Leakage Clamp TRMS Meter with Power Function Instrument Description

2. Instrument Description

Becoming familiar with the equipment

1 Transformer jaws

2 Protection ring

3 Jaw opening trigger

4 Function switch

5 Keypad

6 LCD display

7 Terminals

Transformer clamps

Capture the a.c. flowing through the conductor. D.c. cannot be measured.

Keyboard

The clamp A-meter keyboard consists of four push buttons. Table 1 describes the function

of each one.

MD9272 Leakage Clamp TRMS Meter with Power Function Instrument Description

Table 1. Keyboard

Key

Use

Function

F –Function

Any position of the

rotary switch

Function selection key. Depending on the

rotary switch position, the functions will

vary, (refer to section 3).

Pressing this button cycles through the

various functions.

A and V, in the

RMS function only

Pressed for more than 2 s, alternates the

second display information from THD to

Hz.

H –Hold

Any position of the

rotary switch in all

the functions

except in PEAK

function

When pressed the data switch retention

mode is accessed and the screen

information is not updated. Pressed

again, the MAX mode is accessed for the

Next pressed, the MIN mode is accessed

for the register of minimum values.

Pressed again returns to the normal

mode.

Light

Any position of the

rotary switch, in all

the functions

With a long press of the key (more than 2

s) the LCD screen retro-illumination is lit

up. 30 s after any button was pressed, it

switches off automatically.

Auto

A and V, in the

RMS function only

Cycles through the different manual

ranges until the Autorange is active again.

A and V in the

harmonic

measurement

function

Increase the number of harmonic to be

measured.

AC/DC

V, in the RMS

function only

Alternates between V a.c. or V d.c.

measurements.

A and V in the

harmonic

measurement

function

Decreases the number of harmonic to be

measured.

Table 2. Rotary switch positions

Position

Function

OFF

OFF position.

Measurement of a.c. current up to 100 A.

Measurement of a.c. or d.c. voltage up to 600 V.

Measurement of power of up to 60 kVA, with limits of 100 A

and 600 V.

MD9272 Leakage Clamp TRMS Meter with Power Function Instrument Description

LCD Screen

Data retention indication.

Maximum reading indication.

Minimum reading indication.

PEAK

Peak measurement function, this is the maximum value of the

measured magnitude, whether voltage or current.

Phase angle measurement function of the current in reference to

the voltage.

Indicates that the current is in front compared to the voltage.

Indicates that the current is behind compared to the voltage.

Indication of a loss, possibly due to insulation defects, only in the

mA measurement mode.

Indication of a loss, possibly due to insulation defects and

accumulation of non-lineal loads, only in the mA measurement

mode.

Indication of a loss, possibly due to a high accumulation of non-

lineal loads, only in the mA measurement mode.

Indication that the measured magnitude is expressed in a true

effective value.

Measurement function of the crest factor of the measured

magnitude.

AC input indication.

DC input indication.

mA, A

mili Amperes, Amperes.

MD9272 Leakage Clamp TRMS Meter with Power Function Instrument Description

Volts.

VAr, kVAr

Reactive Volt amperes, Reactive Kilovolt amperes. Reactive power

measuring units.

VA, kVA

Volt amperes, Kilovolt amperes. Apparent power measuring units.

W, kW

Watts, Kilowatts. Active power measuring units.

Indicates the measurement of a percent value.

THD

Total harmonic distortion ratio

Power factor.

HARMONIC

Indication of the measured harmonic.

Frequency measurement unit.

Indication that range is selected automatically.

Full battery.

Medium battery.

Low battery.

Battery is close to be discharged

Input

Table 3 shows the information on input.

Table 3: Input

Input

Description

COM

Input received by the black test probe as common reference.

Input received by the red test probe for the voltage and

power measurements.

MD9272 Leakage Clamp TRMS Meter with Power Function Instrument Description

Measurement of power Measurement of current Measurement of voltage

Standby Mode

If the clamp-meter is not used for a period of 15 minutes, the screen will go blank and the

clamp-meter will go into standby mode. To remove the clamp-meter from standby mode,

the rotary switch needs to be turned to the OFF position and then back to the function to

reactive the screen.

Accessories

•Test probes

•Batteries (2 AA 1,5V batteries)

•Instruction manual

•Carrying Case

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