Sonel MZC-320S User manual

USER MANUAL

SHORT-CIRCUIT LOOP

IMPEDANCE METERS

MZC-320S ● MZC-330S

SONEL S.A.

Wokulskiego 11

58-100 Świdnica

Poland

Version 1.11 04.10.2023

MZC-320S and MZC-330S meters are modern, easy in use and safe measuring devices. Please ac-

quaint yourself with this manual in order to avoid measuring errors and prevent possible problems in

operation of these meters.

MZC-320S ● MZC-330S –USER MANUAL

TABLE OF CONTENTS

1General information.........................................................................................5

1.1 Safety symbols......................................................................................................... 5

1.2 Safety.......................................................................................................................6

2Graphical display panel (LCD)........................................................................8

3Menu................................................................................................................10

3.1 Display contrast adjustment................................................................................... 10

3.2 Display settings...................................................................................................... 10

3.3 Loop measurement settings................................................................................... 11

3.4 Language selection................................................................................................ 11

3.5 Advanced functions................................................................................................ 12

3.5.1 Expected dispersion of results.........................................................................................12

3.5.2 Upgrading the firmware...................................................................................................13

3.6 Information about the manufacturer and the software............................................ 13

4Measurements................................................................................................14

4.1 Conditions for performing tests and obtaining correct results................................. 15

4.2 Remembering the last measurement result............................................................ 16

4.3 Measurement of alternating voltage....................................................................... 16

4.4 Measurement of fault loop parameters................................................................... 17

4.4.1 Measurement of ntwork voltage and frequency...............................................................18

4.4.2 Measurement of network voltage and frequency .............................................................18

4.4.3 Displaying all measurement results or the main result only .............................................18

4.4.4 Displaying the measurement results in terms of impedance or short-circuit current.........18

4.4.5 Measurement of touch voltage UST and touch shock voltage UT......................................19

4.4.6 Selection of test cables length (for measurements using two-pole method).....................21

4.4.7 Results display................................................................................................................21

4.4.8 Measurement of short-circuit loop parameters using two-pole method..................................22

4.4.9 Measurement of short-circuit loop parameters using four-pole method............................24

4.4.10 measurement of earthing resistances..............................................................................26

5Remote control of the meter.........................................................................28

6Saving the measurement results .................................................................29

6.1 Storing measurement results in the memory.......................................................... 29

6.2 Memory browsing................................................................................................... 30

6.3 Memory erasing ..................................................................................................... 30

7Data transmission..........................................................................................31

7.1 Set of accessories to connect the meter to a PC ................................................... 31

7.2 Data transmission via USB..................................................................................... 31

7.3 Data transmission via Bluetooth............................................................................. 32

7.3.1 Activation and transmission.............................................................................................32

7.3.2 Read-out and change of PIN code for Bluetooth .............................................................32

7.4 Data transmission using Wi-Fi................................................................................ 33

7.4.1 Activation of transmission................................................................................................33

7.4.2 Transmission to PC software...........................................................................................33

7.4.3 Transmission via the network interface............................................................................34

8Troubleshooting.............................................................................................35

8.1 Warnings and information displayed by the meter ................................................. 35

8.1.1 Exceeding the measurement range.................................................................................35

MZC-320S ● MZC-330S –USER MANUAL

8.1.2 Battery status display......................................................................................................35

8.2 Self-test error messages........................................................................................ 35

8.3 Before you send the device for repairs................................................................... 36

9Power supply of the meter............................................................................36

9.1 Power supply voltage monitoring ........................................................................... 36

9.2 Charging battery..................................................................................................... 37

9.3 General principles for using Li-Ion rechargeable batteries..................................... 37

10 Cleaning and maintenance ...........................................................................38

11 Storage............................................................................................................38

12 Dismantling and disposal .............................................................................38

13 Technical specifications ...............................................................................38

13.1 Basic data .............................................................................................................. 38

13.2 Other technical data............................................................................................... 41

13.3 Additional data ....................................................................................................... 42

13.3.1 Additional uncertainties according to IEC 61557-3 (Z).....................................................42

14 Manufacturer ..................................................................................................42

MZC-320S ● MZC-330S –USER MANUAL

1 General information

1.1 Safety symbols

Symbols

and warnings

Description

NOTE

WARNING

NOTE and WARNING messages in the following document indicate important information that should be read before using

the meter.

Triangle with an exclamation mark inside it, marked on the meter housing indicates that user must read important infor-

mation in the user manual.

The device is protected by double or reinforced insulation.

The device is CE certified and meets the necessary European requirements.

CAT IV 600 V

Measurement Category IV is applicable to test and measurement circuits connected to the source of low voltage power

supply system of the building.

It is expected that this part of the system will have at least one level of overcurrent protection between the transformer and

the connection points of the measuring circuit.

Due to the high short-circuit currents, which may be accompanied by a high level of energy, the measurements in these

areas are extremely dangerous. Take all necessary precautions to avoid the risk of a short circuit.

Examples include measurements on devices installed upstream the main fuse or circuit breaker of the building system.

Grounding symbol at the end of the string of symbols reminds that the specified voltage is the voltage relative to

the ground.

Do not dispose of with other household waste

AC current/voltage

DC current/voltage

MZC-320S ● MZC-330S –USER MANUAL

Measurement categories according to IEC 61010-2-030:

CAT II –concerns measurements performed in circuits directly connected to low voltage in-

stallations,

CAT III –concerns measurements performed in buildings installations,

CAT IV –concerns measurements performed at the source of low voltage installation.

1.2 Safety

MZC-320S and MZC-330S meters are designed for performing check tests of protection against

electric shock in mains systems. The meters are used for making measurements and providing results

to determine safety of electrical installations. Therefore, in order to provide conditions for correct oper-

ation and accuracy of obtained results, the following recommendations must be observed:

Before you proceed to operate the meter, acquaint yourself thoroughly with this manual and ob-

serve the safety regulations and specifications provided by the producer.

Any application that differs from those specified in the manual may result in a damage to the de-

vice and constitute a source of danger for the user.

MZC-320S and MZC-330S meters must be operated only by appropriately qualified personnel with

relevant certificates authorizing the personnel to perform works on electric systems. Operating the

meter by unauthorized personnel may result in damage to the device and constitute a source of

danger for the user.

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

lations 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:

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

a meter with damaged insulation,

a meter stored for an excessive period of time in disadvantageous conditions (e.g. excessive

humidity). If the meter has been transferred from a cool to a warm environment with a high

level of relative humidity, do not start measurements until the meter is warmed up to the ambi-

ent temperature (approximately 30 minutes).

MZC-320S ● MZC-330S –USER MANUAL

One should remember that when the word Bat! appears on the display, it indicates insufficient

voltage of power supply and the need to charge the battery. Measurements performed by means

of the meter whose supply voltage is too low are burdened with additional errors that are impossi-

ble to be estimated by the user. Such measurements must not be relied on in order to state cor-

rectness of protection of a tested network.

Before measurements may commence, make sure the leads are connected to the appropriate

measurement sockets.

Repairs may be performed only by an authorized service point.

The correct operation of the instrument and accessories must be checked regularly to avoid any

hazard which may result from erroneous results.

In a situation where the product works with other instruments or accessories, the lowest meas-

urement category of the connected devices is used.

WARNING

Only standard and additional accessories for a given device should be used. Using

other accessories may cause damage to measuring terminals and introduce additional

measurement uncertainty.

An attempt to install drivers in 64-bit Windows 8 and Windows 10 may result in dis-

playing "Installation failed" message.

o Cause: Windows 8 and Windows 10 by default blocks drivers without a digital

signature.

o Solution: Disable the driver signature enforcement in Windows.

Due to continuous development of the meter’s software, the actual appearance of

the display, in case of some of the functions, may slightly differ from the display pre-

sented in this operating manual.

MZC-320S ● MZC-330S –USER MANUAL

2 Graphical display panel (LCD)

Fig. 1 Screen appearance after switching the meter on

(loop impedance measurement –all results)

Fig. 2 Screen layout in alternating voltage measurement mode

Fig. 3 Screen layout in short-circuit loop impedance measurement mode (all results)

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