METREL MD 9250 Manual de usuario

METREL MD 9250

Industrial TRMS AC/DC CAT IV 1000 V

MD 9250

User Manual

Bedienungsanleitung

Version 1.1, Code no. 20 752 003

Distributor:

METREL d.d.

Ljubljanska cesta 77

1354 Horjul

Slovenia

e-mail: [email protected]

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

Metrel GmbH

Mess und Prüftechnik

Orchideenstrasse 24

90542 Eckental -Brand

Germany

E-mail: [email protected]

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

Metrel UK Ltd.

Test & Measurement

Unit 16, 1st Qtr Business Park

Blenheim Road

Epsom

Surrey

KT19 9QN,

Great Britain

E-mail: [email protected]

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

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

(European Community) regulations concerning safety and electromagnetic compatibility.

No part of this publication may be reproduced or utilized in any form or by any means

without permission in writing from METREL.

MD 9250 Clamp Meter Series Table of contents / Inhalt

Table of contents/ Inhalt

English

1 Safety ...........................................................................................................................4

2 Cenelec Directives........................................................................................................6

3 Product Description ......................................................................................................7

4 Operation......................................................................................................................8

5 Specifications..............................................................................................................16

6 Maintenance...............................................................................................................21

Deutsch

1 Sicherheitsbestimmungen ..........................................................................................23

2 Cenelec-Richtlinien.....................................................................................................24

3 Produktbeschreibung..................................................................................................25

4 Betrieb........................................................................................................................26

5 Spezifikationen ...........................................................................................................34

6 Wartung......................................................................................................................39

MD 9250 Clamp Meter Series Safety

1 Safety

MaintenanceThis manual contains information and warnings that must be followed for

operating the instrument safely and maintaining the instrument in a safe operating

condition. If the instrument is used in a manner not specified by the manufacturer, the

protection provided by the instrument may be impaired.

The meter protection rating, against the users, is double insulation per IEC/EN61010-1

2nd Ed., UL61010-1 2nd Ed., CAN/CSA C22.2 No. 61010.1-0.92, IEC/EN61010-2-032,

UL61010B-2-032, CAN/CSA C22.2 No. 61010-2-032-04 & IEC/EN61010-

031:2002/A1:2008:

Measurement Category IV 1000V AC & DC.

PER IEC61010 OVERVOLTAGE INSTALLATION CATEGORY

OVERVOLTAGE CATEGORY II

Equipment of OVERVOLTAGE CATEGORY II is energy-consuming equipment to be

supplied from the fixed installation.

Note –Examples include household, office, and laboratory appliances.

OVERVOLTAGE CATEGORY III

Equipment of OVERVOLTAGE CATEGORY III is equipment in fixed installations.

Note –Examples include switches in the fixed installation and some equipment for

industrial use with permanent connection to the fixed installation.

OVERVOLTAGE CATEGORY IV

Equipment of OVERVOLTAGE CATEGORY IV is for use at the origin of the installation.

Note –Examples include electricity meters and primary over-current protection

equipment.

TERMS IN THIS MANUAL

WARNING identifies conditions and actions that could result in serious injury or even

death to the user.

CAUTION identifies conditions and actions that could cause damage or malfunction in

the instrument.

WARNING

To reduce the risk of fire or electric shock, do not expose this product to rain or moisture.

The meter is intended only for indoor use.

To avoid electrical shock hazard, observe the proper safety precautions when working

with voltages above 60 VDC or 30 VAC rms. These voltage levels pose a potential

shock hazard to the user.

Keep your hands/fingers behind the hand/finger barriers (of the meter and the test leads)

that indicate the limits of safe access of the hand-held part during measurement.

Inspect test leads, connectors, and probes for damaged insulation or exposed metal

before using the instrument. If any defects are found, replace them immediately.

MD 9250 Clamp Meter Series Safety

This Clamp-on meter is designed to apply around or remove from uninsulated

hazardous live conductors. But still, individual protective equipment must be used if

hazardous live parts in the installation where measurement is to be carried out could be

accessible.

CAUTION

Disconnect the test leads from the test points before changing meter functions.

INTERNATIONAL ELECTRICAL SYMBOLS

Caution ! Refer to the explanation in this Manual

Caution ! Risk of electric shock

Earth (Ground)

Double Insulation or Reinforced insulation

Fuse

AC--Alternating Current

DC--Direct Current

Application around and removal from hazardous live conductors is

permitted

MD 9250 Clamp Meter Series Cenelec Directives

2 Cenelec Directives

The instruments conform to CENELEC Low-voltage directive 2006/95/EC and

Electromagnetic compatibility directive 2004/108/EC

MD 9250 Clamp Meter Series Product Description

3 Product Description

This user's manual uses only representative model(s) for illustrations. Please refer

specification details for function availability to each model.

1) Antenna for Non-Contact EF-

Detection

2) Hand/Finger Barrier to indicate

the limits of safe access of the

meter during measurement

3) Rotary-switch Selector to turn

the power ON/OFF and Select a

function

4) Push-buttons for special

functions & features.

5) Input Jack for all functions

EXCEPT non-invasive DCA &

ACA current functions

6) Common (Ground reference)

Input Jack for all functions

EXCEPT non-invasive DCA &

ACA current functions

7) 3-5/6 digits 6000 counts & 3-

1/2 digits 2000 counts dual

numeric LCD display

8) Jaw trigger for opening the

clamp jaw

9) Jaw center (& DCA polarity)

Indicator, at where best DCA &

ACA accuracy is specified

10) Hall-effect Clamp Jaw for AC

& DC current magnetic field pick

MD 9250 Clamp Meter Series Operation

4 Operation

CAUTION: Before and after hazardous voltage measurements, test the voltage

function on a known source such as line voltage to determine proper meter

functioning.

AutoCheckTM mode

This innovative AutoCheckTM feature automatically selects measurement function of

ACVHz,DCV, or Resistance ()based on the input via test leads.

●With no input, the meter displays “Auto” when it is ready.

●With no voltage signal but a resistance below 10M(nominal) is present, the meter

displays the resistance value. When the resistance is below the “Audible Threshold”,

the meter further gives a continuity beep tone.

●When a signal above the voltage threshold of 1.5V DC or AC up to the rated 1000V

is present, the meter displays the voltage value in appropriate DCV or ACV,

whichever larger in peak magnitude.

Note:

*Range-Lock and Function-Lock Feature: When a measurement reading is being

displayed in AutoCheckTM mode, press the RANGE or SELECT button momentarily 1

time can lock the range or function it was in. Press the button momentarily repeatedly to

step through the ranges or functions.

*As Hazardous-Alert: When making resistance measurements in AutoCheckTM mode,

an unexpected display of voltage readings alerts you that the object under test is being

energized.

MD 9250 Clamp Meter Series Operation

*Ghost-voltage Buster: Ghost-voltages are unwanted stray signals coupled from

adjacent hard signals, which confuse common multimeter voltage measurements. Our

AutoCheckTM mode provides low (ramp-up) input impedance (approx. 2.5kΩ at low

voltage) to drain ghost voltages leaving mainly hard signal values on meter readings. It

is an invaluable feature for precise indication of hard signals, such as distinguishing

between hot and open wires (to ground) in electrical installation applications.

WARNING:

AutoCheckTM mode input impedance increases abruptly from initial 2.5kΩ to a few

hundred kΩ’s on high voltage hard signals. “LoZ” displays on the LCD to remind the

users of being in such low impedance mode. Peak initial load current, while probing

1000VAC for example, can be up to 566mA (1000V x 1.414 / 2.5kΩ), decreasing

abruptly to approx. 3.37mA (1000V x 1.414 / 420kΩ) within a fraction of a second. Do

not use AutoCheckTM mode on circuits that could be damaged by such low input

impedance. Instead, use rotary-switch selector or high input impedance voltage

modes to minimize loading for such circuits.

VFD-ACVHz & ACVHz functions

Inputs are made through the test leads terminals.

VFD-ACV Hz function is to deal with VFD (Variable Frequency Device) signals. It,

however, further pre-selects the most appropriate voltage-ranges and thus the Hz

trigger levels to best cope with most VFD-Voltage and VFD-Frequency applications.

Note: The Hz trigger level is determined by the AC/DC+AC Voltage or Current

function-range being in use. Press RANGE button to select different function-ranges

and thus trigger levels manually.

DCV & DC+ACVHz functions

Inputs are made through the test leads terminals. Defaults at DCV Function. Press

SELECT button momentarily and release to select DC+ACVHz.

MD 9250 Clamp Meter Series Operation

ACA Hz, DCA & DC+ACAHz functions

Input is made through the clamp jaws for non-invasive current measurements. Defaults

at ACA Hz Function. Press SELECT button momentarily and release to select the

subject functions in sequence.

CAUTION (Application and removal of the Clamp-on meter)

For non-invasive current measurements, press the jaw trigger and clamp the jaws

around conductor(s) of only one single pole of a circuit for load current measurement.

Make sure the jaws are completely closed, or else it will introduce measurement errors.

Enclosing conductor(s) of more than one pole of a circuit may result in differential

current (like identifying leakage current) measurement. Locate the conductor(s) at the

Jaws center as much as possible to get the best measuring accuracy. For removal,

press the jaw trigger and remove the jaws from the conductor(s).

Adjacent current-carrying devices such as transformers, motors and conductor wires will

affect measurement accuracy. Keep the jaws away from them as much as possible to

minimize influence.

Resistance & Continuity functions

Inputs are made through the test leads terminals. Defaults at Resistance. Press

SELECT button momentarily and release to select. Continuity

Capacitance & Diode functions

Inputs are made through the test lead terminals. Defaults at Capacitance. Press

SELECT button momentarily and release to select Diode.

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