Sonel MZC-305 User manual

OPERATING MANUAL

FAULT LOOP IMPEDANCE METER

MZC-305

SONEL SA

ul. Wokulskiego 11

58-100 Świdnica, Poland

Version 1.08 25.01.2016

OPERATING MANUAL MZC-305 version 1.08

The MZC-305 meter is a modern, easy in use and safe measuring device. Please acquaint yourself

with the present manual in order to avoid measuring errors and prevent possible problems related to

operation of the meter.

OPERATING MANUAL MZC-305 version 1.08

CONTENTS

1SAFETY....................................................................................................................5

2MEASUREMENTS..................................................................................................6

2.1 SELECTION OF GENERAL MEASUREMENT PARAMETERS.........................................6

2.2 REMEMBERING THE LAST MEASUREMENT RESULT ................................................7

2.3 MEASUREMENT OF ALTERNATING VOLTAGE .........................................................8

2.4 CHECKING CORRECTNESS OF PE (PROTECTIVE EARTH)CONNECTIONS..................8

2.5 MEASUREMENT OF FAULT LOOP PARAMETERS ......................................................8

2.5.1 Selection of measurement parameters ...........................................................9

2.5.2 Prospective short-circuit current.................................................................10

2.5.3 Measurement of fault loop parameters in the L-N and L-L circuits ............11

2.5.4 Measurement of fault loop parameters in the L-PE circuit .........................13

2.5.5 Measurement of short circuit loop impedance in L-PE circuit protected with

a residual current device (RCD)..................................................................15

3MEMORY OF MEASUREMENT RESULTS.....................................................17

3.1 STORING THE MEASUREMENT RESULT DATA IN THE MEMORY .............................17

3.2 CHANGING THE CELL AND BANK NUMBER...........................................................19

3.3 VIEWING MEMORY DATA.....................................................................................20

3.4 DELETING MEMORY DATA...................................................................................21

3.4.1 Deleting bank data.......................................................................................21

3.4.2 Deleting the whole memory .........................................................................22

3.5 COMMUNICATION WITH A COMPUTER .................................................................23

3.5.1 Computer connection accessories ...............................................................23

3.5.2 Data transmission........................................................................................23

3.5.3 Software update...........................................................................................24

4TROUBLESHOOTING.........................................................................................25

5METER POWER SUPPLY...................................................................................26

5.1 MONITORING OF THE POWER SUPPLY VOLTAGE...................................................26

5.2 REPLACEMENT OF BATTERIES .............................................................................26

5.3 GENERAL RULES OF USING THE NICKEL METAL HYDRIDE (NI-MH) BATTERIES..28

6CLEANING AND MAINTENANCE....................................................................29

7STORAGE ..............................................................................................................29

8DISMANTLING AND DISPOSAL.......................................................................29

9TECHNICAL SPECIFICATIONS .......................................................................30

9.1 BASIC DATA ........................................................................................................30

OPERATING MANUAL MZC-305 version 1.08

9.2 ADDITIONAL DATA..............................................................................................32

9.2.1 Additional uncertainties according to IEC 61557-3 (Z)..............................32

10 EQUIPMENT .........................................................................................................33

10.1 STANDARD EQUIPMENT.......................................................................................33

10.2 OPTIONAL ACCESSORIES .....................................................................................33

11 MANUFACTURER ...............................................................................................35

OPERATING MANUAL MZC-305 version 1.08

1 Safety

The MZC-305 meter is designed for testing the protection against electric shock in the mains

systems. The meter is used to make measurements which results determine the electrical installation

safety level. Consequently, in order to ensure safe operation and correct measurement results,

observe the following recommendations:

Before you proceed to operate the meter, acquaint yourself thoroughly with the present manual

and observe the safety regulations and recommendations of the manufacturer.

Any application that differs from those specified in the present manual may cause damage of the

instrument and a serious hazard to its user.

The MZC-305 meters must be operated solely by appropriately qualified personnel with relevant

certificates to perform measurements of electric installation. Operation of the instrument by

unauthorized personnel may result in damage to the device and constitute a hazard to the user.

Using this manual does not exclude the need to comply with occupational health and safety

regulations and with other relevant fire regulations required during the performance of a particular

type of work. Before starting the work with the device in special environments, e.g. potentially fire-

risk/explosive environment, it is necessary to consult it with the person responsible for health and

safety.

It is unacceptable to operate the following:

a damaged meter which is completely or partially out of order,

leads with damaged insulation,

a meter which ahs been stored to long in unsuitable conditions (for example is wet). When the

meter is transferred from cold environment to warm and humid one, do not make

measurements until the meter warms up to the ambient temperature (about 30 minutes).

Remember that the message on the display means that the power supply voltage is too low

and indicates the need to replace/ charge the batteries. The measurements performed with the

meter with insufficient supply voltage have additional measuring errors which are impossible to be

evaluated by the user and cannot be the basis to determine the correct protection of the tested

installation.

Do not leave the discharged batteries in the meter as they can leak and damage the instrument.

Before starting the measurement, check if the leads are connected to correct measuring

terminals.

Never use the meters with open or only partially closed battery compartment cover and use only

the power supplies specified in this manual.

Repairs may be performed solely by an authorized service outlet.

NOTE

Use only standard and optional accessories intended for a given instrument which are

listed in the “Equipment” section. Using other accessories may cause damage of the

measuring terminal and additional measuring errors.

Note:

An attempt to install drivers in 64-bit Windows 8 may result in displaying "Installation

failed" message.

Cause: Windows 8 by default blocks drivers without a digital signature.

Solution: Disable the driver signature enforcement in Windows.

OPERATING MANUAL MZC-305 version 1.08

Note:

Due to continuous development of the meter software, the display view for some

functions may be a bit different from the view shown in this manual.

2 Measurements

WARNING:

During measurements, the earthed parts and parts accessible in the electrical

installation being tested must not be touched.

WARNING:

During a measurement, switching of the range switch is forbidden because it

may damage the meter and pose a threat to the user.

2.1 Selection of general measurement parameters

Keeping the SETUP button

depressed, turn on the meter and wait

for the parameter selection screen.

SEL

The SEL button is used to go to the next

parameter and to confirm the changes in the

currently displayed parameter.

Use the and buttons to change the

parameter value. The value or symbol to be

changed is flashing.

The symbol indicates an active parameter,

the symbol indicates an inactive one.

Set the parameters according to the following algorithm:

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