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OPERATING MANUAL
FAULT LOOP IMPEDANCE METER
MZC -20E
SONEL S.A.
ul. Wokulskiego 11
58-100 Świdnica, Poland
Version 1.00 01.12.2016
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MIC-20 meter is a modern, high quality, easy to use and safe measuring device. Please acquaint
yourself with this manual in order to avoid measuring errors and prevent possible problems in operation of the meter.
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CONTENTS
1 SAFETY .................................................................................................................... 4
2 MEASUREMENTS .................................................................................................. 5
2.1 TURNING THE METER ON AND OFF, DISPLAY BACKLIGHT .......................................... 5
2.2 SELECTION OF GENERAL MEASUREMENT PARAMETERS ............................................ 5
2.3 REMEMBERING THE LAST MEASUREMENT RESULT ................................................... 6
2.4 MEASUREMENT OF ALTERNATING VOLTAGE (AC) .................................................... 7
2.5 MEASUREMENT OF FAULT LOOP PARAMETERS ......................................................... 7
2.5.1 Cable length selection ....................................................................................... 7
2.5.2 Prospective short-circuit current ...................................................................... 8
2.5.3 Measurement of fault loop parameters in the L-N(PEN) and L-L circuits ....... 8
2.6 MEASUREMENT OF RESISTANCE-TO-EARTH ............................................................ 10
3 TROUBLESHOOTING ......................................................................................... 11
4 POWER SUPPLY .................................................................................................. 12
4.1 MONITORING THE POWER SUPPLY VOLTAGE ........................................................... 12
4.2 REPLACING (RECHARGEABLE) BATTERIES .............................................................. 12
4.3 GENERAL PRINCIPLES REGARDING USING NI-MH RECHARGEABLE BATTERIES ....... 13
5 CLEANING AND MAINTENANCE .................................................................... 14
6 STORAGE .............................................................................................................. 14
7 DISMANTLING AND DISPOSAL ....................................................................... 14
8 TECHNICAL SPECIFICATIONS ....................................................................... 15
8.1 BASIC DATA ........................................................................................................... 15
8.2 ADDITIONAL DATA ................................................................................................. 16
9 ACCESSORIES ...................................................................................................... 16
9.1 STANDARD EQUIPMENT .......................................................................................... 16
9.2 OPTIONAL ACCESSORIES......................................................................................... 17
10 MANUFACTURER ............................................................................................... 18
11 LABORATORY SERVICES ................................................................................. 19
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1 Safety
MZC-20E meter is designed for performing check tests of protection against electric shock in
mains systems. The meter is used for making measurements and providing results to determine safety of electrical installations. Therefore, in order to provide conditions for correct operation and accuracy of obtained results, the following recommendations must be observed:
Before you proceed to operate the meter, acquaint yourself thoroughly with the present manual
and observe 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-20E meters must be operated only by appropriately qualified personnel with relevant certifi-
cates authorising the personnel to perform works on electric systems. Unauthorized use of the
meter may result in its damage and may be a source of serious hazard to 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 firerisk/explosive environment, it is necessary to consult it with the person responsible for health and
safety.
It is unacceptable to operate the device when:
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 ambient temperature (approximately 30 minutes).
One should remember that when the word appears on the display, it indicates insufficient volt-
age of power supply and the need to charge the accumulator or replace batteries. Measurements
performed by means of the meter whose supply voltage is too low are burdened with additional
uncertainties that are impossible to be estimated by the user. Such measurements must not be
relied on in order to state correctness of protection of a network tested.
Battery spill and damage to the meter may occur if discharged batteries are left in the meter.
Before measurements may commence, make sure the leads are connected to the appropriate
measurement sockets.
Do not operate a meter with an open or incorrectly closed battery (accumulator) compartment or
power it from other sources than those specified in the present manual.
Repairs may be performed only by an authorised service point.
ATTENTION!
Only standard and additional accessories for a given device should be used, as listed in
the "Equipment" section. Using other accessories may cause damage to measuring terminals and introduce additional measurement uncertainty.
Note:
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 presented in this
operating manual.
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2 Measurements
WARNING:
During the fault loop measurements, the earthed parts and parts accessible in the electrical installation being tested must not be touched.
CAUTION!
If an installation with residual current protection was modified for the time of measurement
in order to ignore the RCD, remember to restore the state of the device that ensures correct operation of that switch.
2.1 Turning the meter on and off, display backlight
Briefly press the button to turn on the meter . Press it for a longer time to turn it off (text is
displayed ). Press briefly the button during meter operation to turn on/off the display.
2.2 Selection of general measurement parameters
+
Keeping START button depressed, turn
on the meter with the on/off button and
wait a moment for the parameter selection
screen. Briefly press the on/off, button keeping the START button depressed to turn on
the meter without display backlight. Press
the on/off button for a longer time with the
START button depressed to turn on display
backlight.
or
Press the button down
or up to
go to
different values in a given setting.
Validate the set parameter using the START
button while moving to the next setting.
Leave the parameter settings without validation using the on/off button and go to the meter readiness to measure.
Set the parameters according to the following algorithm:
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Press START to validate the changes and go to the
measurement function, or…
...press on/off to go the measurement function
without validating the changes.
Note:
- Before the first measurements, select the mains rated voltage Un (220/380V, 230/400V or 240/415V)
used in in the area where measurements are performed. This voltage value is used for calculating the
values of prospective short-circuit current Ik.
- Symbol indicates that no auto-off time has been set.
2.3 Remembering the last measurement result
The last measurement result is remembered until another measurement is started. The parameters of the settings will be changed or the device will turn off automatically (AutoOff). After a period of
idle time since the last measurement (about 10 seconds) the meter will indicate its readiness for an-
other measurement. Information is displayed after 5 seconds since the measurement was
taken, and the measurement result disappears from the display after 10 seconds. Press the up or
down arrow to restore the last measurement result. Re-press any of the arrows to recall the value
of short-circuit current IK and the real and imaginary component of the measured impedance (R, XL).
Measuring lead
length setting
Nominal voltage
to calculate the
short-circuit current IK
Beeper
Auto Off
Switching to the measuring
function
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2.4 Measurement of alternating voltage (AC)
After connecting the meter to the tested network its readiness for measurement is indicated by
displaying information
.
The main display field shows alternating current of the network. This
voltage is measured for the frequencies within the range of 45...65 Hz.
Battery/accumulator charge status
The meter is ready for measurement.
The set length of the phase conductor.
The voltage value in the tested network.
2.5 Measurement of fault loop parameters
If residual current devices have been installed in the network tested, they should be bypassed
at the input and output of the active RDC cable (bridging). However, it should be remembered
that the tested circuit is modified in this way and the obtained results may slightly differ from
the actual results.
Each time after the measurements have been taken, remember to restore a state that ensures
proper operation of the RCD switch and check whether it operates.
Measurements of short-circuit loop impedance downstream the inverters are ineffective and
measurement results unreliable. This is due to the fluctuations of internal impedance of the
inverter during its operations. Do not perform measurements of short-circuit loop impedance
directly downstream inverters.
2.5.1 Cable length selection
Set the parameters according to the following algorithm, and according to the rules described in
general parameters setting (see section 2.2)
Using cables terminated with banana plugs, before starting to measure, select the appropriate length
of the phase conductor, compatible with the length of cable used for measurement.
Cables from known manufacturers and selection of the correct length guarantees the declared measurement accuracy.
Measuring lead
length setting
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2.5.2 Prospective short-circuit current
The meter always measures impedance. The short-circuit current is calculated according to the
following formula:
S
n
k
Z
U
I
where: Un - mains rated voltage, ZS - measured impedance.
On the basis of Un rated voltage selected (section 2.2), the meter automatically recognizes the
measurement at phase-to-neutral or phase-to-phase voltage and takes it into account in the calculations.
If the voltage of the network being tested is outside the tolerance range, the meter will not be
able to determine a proper rated voltage for the short-circuit current calculation. In such a case, horizontal dashes will be displayed instead of short-circuit current value. The following diagram shows
voltage ranges for which short-circuit current value is calculated.
230
400
440
U [V]
Zakresy napięć U , dla których
liczony jest prąd zwarciowy
L-N
Zakres napięcia, dla którego wykonywany
jest pomiar impedancji
207
253
360
220
380
418
198
242
342
373
415
440
216
240
264
440
U [V]
U [V]
U =220V
n
U =230V
n
U =240V
n
Zakresy napięć U , dla których
liczony jest prąd zwarciowy
L-L
2.5.3 Measurement of fault loop parameters in the L-N(PEN) and L-L circuits
Turn on the meter. Depending on needs, select cable
length according to section 2.5.1.
and the value of nominal voltage of the tested network in
accordance with section 2.5.2.
Connect test leads according to
the drawing
a) for measurement in the L-N circuit
b) for measurement in the L-L circuit
b) for measurement in L-PEN circuit
The voltage range for which the impedance measurement
is performed
The voltage range U
L-N,
for which the short-
circuit current is calculated
The voltage range U
L-L
, for which the short-
circuit current is calculated
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The meter is ready for measurement.
Phase conductor length L
U
L-N
or U
L-L
voltage
Make measurement by pressing START pushbutton.
Read the main measurement result:
mains voltage at the time of
measurement
fault loop impedance ZS
or
The value of short-circuit current Ik and of individual impedance components ZS (R, XL)
may be read when pressing the up or
down arrow buttons
for indications dis-
played in reverse order.
Indication:
Standby
Cable length
Short-circuit current IK
R fault loop resistance
XL fault loop reactance
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Note:
Minimum interval between successive measurements is 5 seconds. This minimum interval requirement is controlled by the meter. The next measurement may be performed only when a message
appears on the screen.
Additional information displayed by the meter
The meter is ready for measurement.
Voltage on terminals L and PEN is not within the measurable range. Conductor N (PEN) is not connected.
Incorrect voltage frequency (outside the range of 45...65
Hz)
Error in the measurement.
Error in the measurement of: loss of voltage after the
measurement.
Short circuit malfunction!
This message displayed after the measurement indicates
major noise in the system during the measurement. The
measurement result may be affected by a large, unspecified error.
The temperature inside the meter has risen above the limit.
The measurement is blocked.
Measuring range is exceeded.
2.6 Measurement of resistance-to-earth
The MZC-20E meter can be used for approximate measurements of resistance to earth For this
purpose, the phase conductor is used as a secondary source of voltage which generates test current.
Connection diagram for the instrument for such measurement in the TN-C, TN-S and TT systems is
shown in the figure below.
During the measurement, check the connections of the measured earth electrode with the electrical installation. For correct measurement, the tested earthing systm should be disconnected from the
electrical installation (N and PE conductors). If you want to measure the earth electrode, for instance
in the TN-C-S system and simultaneously use the phase of the same system as a secondary source
of current, disconnect the PE and N conductors from the measured earth electrode (see figure below).
Otherwise, the meter will measure an incorrect value (the test current will flow not only through the
measured earthing system.
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Note:
WARNING:
Disconnection of protective conductors is a serous life hazard for the staff performing the
measurements and also third parties. When the measurements are completed, the protective and neutral conductors MUST be reconnected.
- If it is not possible to disconnect the conductors, use an earth resistance meter from the MRU range.
- As the measurement result is the sum of impedances of the measured earth electrode, operational
earthing system, source and phase conductor, it contains a positive error. However, if such error does
not exceed a limit value for the tested earthing system, it can be concluded that the earthing has been
made correctly and there is no need for a more accurate measurement methods.
3 Troubleshooting
Before returning the meter for repair, call the service, perhaps the meter is not damaged, and the
problem has occurred for another reason.
The meter repairs should be carried out only in the outlets authorized by the manufacturer.
The following table describes recommended activities in some situations that may occur during
operation of the meter.
Symptom
Cause
Solution
The meter does not
start after pressing the
on/off
button.
The symbol is displayed
during the voltage
measurement
The meter turns off during the measurement
Discharged or incorrectly placed batteries/ rechargeable batteries
Check if the batteries are
placed correctly, replace
and/or recharge the rechargeable batteries. If
this does not help, sent
the meter for servicing.
Measurement errors after
moving the meter from
cold environment to warm
and humid environment.
No acclimatization
Do not perform the measurements until the meter
reaches the ambient temperature (about 30
minutes) and dries.
Further results obtained
in the same measuring
point are significantly
different from each other
Incorrect connections in
the tested system.
Check the connections
and remove defects
Mains with high noise or
unstable voltage
Perform a larger number
of measurements, average the results
Disconnect
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Symptom
Cause
Solution
The meter indicates the
values close to zero or zero irrespective of the location of measurement and
these values are significantly different than expected.
Incorrectly selected test
leads in the meter settings.
4 Power supply
4.1 Monitoring the power supply voltage
The charge level of the batteries or rechargeable batteries is indicated by the symbol in the right
upper corner of the display on a current basis:
Batteries/rechargeable batteries charged.
Batteries/rechargeable batteries discharged
Replace batteries or recharge rechargeable batteries!
Note:
Symbol in the display means that the supply voltage is too low and indicates that the batter-
ies must be replaced or recharged.
Measurements performed with an insufficient supply voltage will be at risk of additional errors
which the user is unable to evaluate. The charge level of the batteries or rechargeable batteries is indicated by the symbol in the right upper corner of the display on a current basis.
4.2 Replacing (rechargeable) batteries
The MZC-20E is powered by four LR6 batteries or AA size rechargeable batteries. The (recharge-
able) batteries are placed in the compartment at the bottom of the enclosure.
WARNING:
Before replacing the (rechargable) batteries, disconnect the test leads from the meter.
To replace the batteries/ rechargeable batteries:
Disconnect the leads from the measuring circuit and turn off the meter,
Remove the screw that secures the battery cover (the bottom of the compartment),
Replace all batteries (rechargeable batteries). Observe the correct polarity when inserting new
batteries/rechargeable batteries ("-" on the elastic part of the contact plate). Reverse polarity will
not damage the meter or the batteries, but the meter will not work.
Place and tighten the battery compartment cover.
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CAUTION!
Have the meter serviced in case of battery leakage inside the compartment.
Rechargeable batteries must be recharged in an external charger.
4.3 General principles regarding using Ni-MH rechargeable batter-
ies
- If you do not use the device for a prolonged period of time, then it is recommended to remove the
rechargeable batteries and store them separately.
- Store the accumulators in a dry, cool and well ventilated place and protect them from direct sunlight.
The temperature of the environment in the case of prolonged storage should not exceed 30°C. If the
rechargeable batteries are stored for a long time in a high temperature, then the occurring chemical
processes may reduce their lifetime.
- Rechargeable batteries NiMH usually lasts for 500-1000 charging cycles. The rechargeable batteries
reach their maximum capacity after being formatted (2-3 charge and discharge cycles). The most important factor which influences the lifetime a a rechargeable battery is the level of its discharging. The
deeper the discharge level of the batteries, the shorter their lifetime.
- The memory effect is limited in the case of NiMH batteries. These batteries may be charged at any
point with no serious consequences. It is however, that every few cycles, they are completely discharged.
- During storage of Ni-MH rechargeable batteries they are discharged at the rate of approximately
30% per month. Storing batteries in high temperatures may increase this process even twofold. In order to prevent excessive discharge of rechargeable batteries, after which it would be necessary to
format them, it is recommended to charge them from time to time (even if they are not used).
- Modern fast chargers detect both too low and too high a temperature of the battery pack and react to
the situation adequately. Too low temperature should prevent starting the process of charging, which
might irreparably damage rechargeable batteries. An increase of the temperature of the rechargeable
batteries is a signal to stop charging and is a typical phenomenon. However charging at a high ambi-
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ent temperature apart from reducing batteries' lifetime causes an accelerated increase of their temperature and the result is that the batteries are not charged to their full capacity.
- Please note that when the batteries are charged with a fast-charger they are charged only to approx.
80% of their capacity - better results can be achieved by continuing charging: the charger enters trickle-charging mode and during the next few hours batteries are charged to their full capacity.
- Do not charge or use the batteries in extreme temperatures. Extreme temperatures reduce the lifetime of batteries and rechargeable batteries . Avoid placing devices powered by rechargeable batteries in very hot environments. The nominal working temperature must be absolutely observed.
5 Cleaning and maintenance
CAUTION!
Use only the maintenance methods specified by the manufacturer in this manual.
The casing of the meter and its case may be cleaned with a soft, damp cloth using all-purpose
detergents. Do not use any solvents or cleaning agents which might scratch the casing (powders,
pastes, etc.).
Clean the probe with water and dry it. Before the probe is stored for a prolonged period of time it
is recommended to grease it with any machine lubricant.
The reels and test leads should be cleaned with water and detergents, and then dried.
The electronic system of the meter does not require maintenance.
6 Storage
In the case of storage of the device, the following recommendations must be observed:
Disconnect all the test leads from the meter.
Clean the meter and all its accessories thoroughly.
Wind the long test leads onto the reels.
If meter is to be stored for a prolonged period of time, the batteries must be removed from the de-
vice.
In order to prevent a total discharge of the accumulators in the case of a prolonged storage,
charge them from time to time.
7 Dismantling and Disposal
Worn-out electric and electronic equipment should be gathered selectively, i.e. it must not be
placed with waste of another kind.
Worn-out electronic equipment should be sent to a collection point in accordance with the law of
waste electrical and electronic equipment.
Before the equipment is sent to a collection point, do not dismantle any elements.
Observe local regulations concerning disposal of packages, waste batteries and accumulators.
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8 Technical specifications
8.1 Basic data
Abbreviation "m.v" used in the specification of measurement uncertainty means a standard
measured value
Voltage measurement
Display range
Resolution
Basic uncertainty
0...440 V
1 V
(2% m.v. + 3 digits)
Frequency range: 45...65 Hz
Measurement of fault loop impedance Z
L-PE
, Z
L-N
, Z
L-L
Measurement of fault loop impedance ZS
Test range according to IEC 61557:
Test lead
Test range ZS
1.2 m
0.24...200
5 m
0.26...200
10 m
0.28...200
20 m
0.35...200
Display range:
Display range
Resolution
Basic uncertainty
0.00...19.99
0.01
(2,5% m.v. + 5 digits)
20.0...99.9
0.1
(2,5% m.v. + 3 digits)
100...200
1
(3% m.v. + 3 digits)
Rated operating voltage U
nL-N
/ U
nL-L
: 220/380 V, 230/400 V, 240/415 V
Operating voltage range: 180…270 V (dla Z
L-PE
i Z
L-N
) oraz 180…440 V (for Z
L-L
)
Rated mains frequency fn: 50 Hz, 60 Hz
Operating frequency range: 45…65Hz
Maximum measuring current: 15,3 A dla 230 V (10 ms) and 26,7 A dla 400 V (10 ms)
Indications of fault loop resistance RS and fault loop reactance XS
Display range
Resolution
Basic uncertainty
0,00..9,99
0.01
(5% + 5 digits) value ZS
Calculated and displayed for ZS<10
Indications of short-circuit current IK
Test range according to IEC 61557 can be calculated on the basis of test ranges ZS and rated voltages.
Display range
Resolution
Basic uncertainty
1.15 ... 9.99 A
0.01 A
Calculated on the basis of
uncertainty for fault loop
10.0 ... 99.9 A
0.1 A
100...999 A
1 A
1.00...9.99 kA
0.01 kA
10.0 ... 40.0 kA
0.1 kA
Prospective fault current calculated and displayed by the meter may slightly differ from the val-
ue calculated by the user with a calculator, basing on the displayed value of the impedance,
because the meter calculates the current from unrounded value of fault loop impedance (which
is used for displaying). As the correct value, consider IK current value, displayed by the meter.
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Other technical data
a) type of insulation .......................................................... double, acc. to EN 61010-1 and IEC 61557
b) measurement category ........................................................................ III 300 V acc. to EN 61010-1
c) degree of housing protection acc. to EN 60529 ........................................................................ IP67
d) meter power supply ............. LR6 alkaline batteries or NiMH rechargeable batteries size AA (4 pcs)
e) dimensions .............................................................................................................. 220x98x58 mm
f) weight of the meter and battery pack ...................................................................................... 509 g
g) storage temperature ..................................................................................................... –20...+70C
h) operating temperature ................................................................................................... -10...+50C
i) humidity ............................................................................................................................. 20...80%
j) reference temperature ..................................................................................................... +23 ± 2C
k) reference humidity ............................................................................................................. 40...60%
l) altitude (above sea level) .................................................................................................. < 2000 m
m) time to Auto-OFF ................................................................................................ max. 900 seconds
n) number of measurements Z (for rechargeable batteries) ........ >5000 (2 measurements per minute)
o) display ........................................................................................................................LCD segment
p) quality standard ................................................ design and manufacturing are ISO 9001 compliant
q) device meets the requirements of IEC 61557 standard
r) the product meets EMC requirements (immunity for industrial environment) according to the fol-
lowing standards............................................................ EN 61326-1:2006 and EN 61326-2-2:2006
8.2 Additional data
Data on additional uncertainties in accordance with IEC 61557-3 (Z) are useful mainly when the
meter is used in non-standard conditions and for metrological laboratories for the purpose of calibration.
Significant parameter
Designation
Additional uncertainty
Position
E1
0%
Supply voltage
E2
0% ( BATis not lit)
Temperature 0...35°C
E3
1.2 m lead
5 m lead – 0.011Ω
10 m lead – 0.019Ω
20 m lead – 0.035Ω
Phase angle 0..30° at the bottom of test range
E
6.2
0.6%
Frequency 99%..101%
E7
0%
Network voltage 85%..110%
E8
0%
Harmonic
E9
0%
DC component
E10
0%
9 Accessories
9.1 Standard equipment
The standard set of equipment supplied by the manufacturer includes:
meter MZC-20E – WMPLMZC20E
set of measuring leads 1.2 m (CAT III 1000 V) with banana plugs – 2 pcs (red -
WAPRZ1X2REBB and blue - WAPRZ1X2BUBB)
accessories
crocodile clip (CAT III 1000 V) – 1 pc (red K02 – WAKRORE20K02)
test probes with banana socket (CAT III 1000 V) – 2 pcs(red – WASONREOGB1 and blue –
WASONBUOGB1)
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stiff hanger with hook – WAPOZUCH1
meter case and accessories – WAFUTM10
meter harness – WAPOZSZE4
CD SONEL
operating manual
guarantee card
calibration certificate
4 LR6 batteries
9.2 Optional accessories
Additionally, the following items that are not included in the scope of standard equipment can be
purchased from the manufacturer or the distributors:
lead 5 m red WAPRZ005REBB
lead 10 m red WAPRZ010REBB
lead 20 m red WAPRZ020REBB
test prod with banana socket WASONYEOGB1
AGT-16P adapter for three-phase sockets
WAADAAGT16P - five-wire version
WAADAAGT16C - four-wire version
triple phase socket adapter AGT-63P
WAADAAGT63P - five-wire version
folding test probe of 2 m length
WASONSP2M
"SONEL Pomiary Elektryczne" ( SONEL Electrical
Measurements) - software for generating measurement reports - WAPROSONPE4
software for creating measurement calculations
"SONEL PE Kalkulacje” (SONEL Calculations) -
WAPROKALK
software for creating drawings, electrical installa-
tion diagrams "SONEL PE Schematic"-
WAPROSCHEM
calibration certificate LSWPLMZC20E
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Note
The software is supported by the following systems: Windows XP (Service Pack 2),
Windows Vista and Windows 7.
10 Manufacturer
The manufacturer of the device and provider of guarantee and post-guarantee service:
SONEL S.A.
ul. Wokulskiego 11
58-100 Świdnica
Poland
tel. +48 74 858 38 60
fax +48 74 858 38 09
E-mail: [email protected]
Web page: www.sonel.pl
Note:
Service repairs must be performed only by the manufacturer.
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11 Laboratory services
Research and Calibration Laboratory of SONEL SA offers calibration of the following instruments
used for electrical/non-electrical measurements:
- meters for electrical protective measurements: insulation resistance, impedance and resistance of
short-circuit loops, earthing resistances and earth resistivity, RCD parameters and multi-functional
meters that perform the above functions,
- electrical safety meters,
- multimeters,
- power quality analysers,
- meters for measuring low resistance values,
- infra-red cameras,
- pyrometers,
- luxmeters.
In addition, the Laboratory performs voltage, current and resistance calibration.
A calibration certificate is a document confirming compliance of parameters declared by the man-
ufacturer of tested device with national standards, specifying the measurement uncertainty.
Pursuant to standard EN ISO 10012:2003 "Measurement management systems — Requirements
for measurement processes and measuring equipment", SONEL S.A. recommends for its instruments
to be periodically tested, observing the interval of 13 months.
For new devices with calibration certificates, the next metrological inspection (calibration) is recommended within 13 months from the date of purchase, but not later than 19 months from the date
of manufacture.
Note:
In case of instruments used for tests related to the protection against electric shock, the
person performing measurements should have complete confidence in the efficiency of
operated apparatus. Measurements carried out with malfunctioning meter may cause wrong
assessment of tested equipment in terms of its protection features
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NOTES
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