Metrix MX 57 EX User manual

Copyright © X02137C00 - Ed. 1 - 06/07
MX 57 EX
Multimètre - Multimeter
Multimeter - Multimetro - Multímetro
50 000 points - counts - Punkte - punti - puntos
de sécurité intrinsèque
intrinsically safe
mit Eigensicherheit
a sicurezza intrinseca
de seguridad intrínseca
Notice de fonctionnement
User's manual
Bedienungsanleitung
Libretto d’istruzioni
Manual de instrucciones
FRANÇAIS - page 4 - Chapitre
ENGLISH - page 24 - Chapter
DEUTSCH - Seite 44 - Kapitel
ITALIANO - pagina 64 - Capitolo
ESPAÑOL - página 84 - Capítulo
I
I
I
IV
III
V

X02137C00 - Ed. 1 - 06/07 Chapitre I
2 Multimètre digital portable de sécurité intrinsèque
17
4
20
5
15
16
14
13
12
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19
6
8
7
9
10
11
1 2 3
IECEx LCI 07.0010 X
LCIE 02 ATEX 6005 X
II 2 G D or I M2
Ex ib I
Ex ib IIC T5 or T4 or T3
Ex ibD 21 T
( See User’s manual )
U < 60V ; I< 500 mA
- ATTENTION : Ne pas ouvrir si une atmosphère explosive peut être présente.
- WARNING : Do not open when an explosive atmosphere may be present.
- ACHTUNG : Nicht öffnen, wenn eine explosive Atmosphäre anwesend sein kann.
IEC 61010-1
CAT III
600V
IP 67

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1. GENERAL INSTRUCTIONS
You have just acquired an intrinsically safe portable digital multimeter and we thank you for
your confidence.
For your own safety and that of the unit, you must observe the instructions described in this
manual to ensure safe operation of the multimeter, in the specified conditions of use.
This MX 57 EX multimeter complies with safety standard EN 61010-1 (2001), double insulation,
relative to electronic measuring instruments. This instrument has been designed for indoor use, in
an environment with pollution level 2, at an altitude of less than 2000 m, at a temperature
between 0°C and 50°C, with relative humidity of less than 80% up to 40°C.
It can be used for measurements on Measurement category III type of circuits for voltages no
higher than 600 V (AC or DC) in relation to the earth.
The safety of any system incorporating this instrument is the responsibility of the system
assembler.
It meets Cenelec European standards EN 60079-0, EN 60079-11 and EN 61241-11
(electrical equipment for explosive atmospheres) as per Directive 94/9/CE (ATEX) and
international standards IEC 60079-0, IEC 60079-11, IEC 61241-0, IEC 61241-11 as per
the IECEx certification system.
It enables electrical measurement in explosive atmospheres in intrinsically safe circuits (gas per
group II C, temperature class depends on the battery) in potential danger zones (zone 1) and in
gassy mines (group I). In accordance with the standard, the certification allows voltage
measurements up to 60 V, current measurements less than 500 mA and not over 40°C.
1.1. Safety measures
After a use on circuits other than those of intrinsically safety, the user must observe a
period of 3 min. waiting before carrying the multimeter in a dangerous area of EX class.
1.1.1. Utilisation of the intrinsically safe multimeter in danger zones
The safe use of equipment in danger zones requires familiarity with the group of gases and
comparison of the self-ignition temperature of the gas mixtures involved with the temperature
indicated on the equipment.
This multimeter must be used only by personnel who are familiar with the rules for explosive
atmosphere equipment and have undergone appropriate training.
1.1.2. Before use
∗Before use in explosive atmospheres, check the type of battery fitted in the
instrument to determine the authorised class of temperature.
If necessary, adapt the battery according to the references in the tables in the Power
Supply §. on page 43.
∗Comply with environmental and storage conditions.
∗The electrical parameters of the intrinsically safe circuit must comply with the
following values : U ≤60 V (peak value) or I ≤500 mA.
The MX 57 EX multimeter may be used for short measurement operations on
category ″ ib ″ intrinsically safe circuits. ″ "Short" means that the multimeter must
not be used continuously, nor be used as a fixed unit.
The MX 57 EX multimeter may be considered as a passive element without
energy accumulator, i.e. with no inductance lint ≈ 0, or capacitance Cint ≈ 0.
During a voltage measurement, to prevent any overload, the existing intrinsically
safe safety circuit must never be opened.

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∗ For your own safety, only use the measuring probes which have been delivered with the
instrument. Before use, check that they are in good condition.
∗ In an explosive atmosphere, use only accessories that have a certificate of conformity
authorising their use with this multimeter.
1.1.3. During use
∗ When the multimeter is linked to measurement circuits, do not touch unused
terminals.
∗ When the scale of the value to be measured is unknown, check that the scale
initially set on the multimeter is the highest possible or, wherever possible, choose
the autoranging mode.
∗ Before changing functions, disconnect the test leads from the circuit under test.
∗ When performing current measurements, never change of range, do not connect or
disconnect leads without first isolating the current. If you do, there is a risk of
generating surge currents which can blow the fuse or damage the instrument.
∗ Never perform resistance measurements on live circuits.
1.1.4. Symbols
Warning: Risk of danger. Refer to the operating manual to find out the nature of the
potential hazards and the action necessary to avoid such hazards.
Earth Dual insulation According to WEEE directive 2002/96/EC
1.1.5. Definition of measurement categories
CAT III: Measurement category III corresponds to measurements on building
installations.
Example: measurements on distribution panels, cabling, etc.
1.1.6. Opening the instrument (performed outside explosive atmosphere only)
∗ Before opening the instrument, always disconnect from all sources of electric
current and make sure not to be loaded with static electricity, which may destroy
internal components.
∗ The F1 fuse certified for EX classified danger zones, as well as the F2 fuse, must
be replaced by a model identical to the origin fuses.
(See §. 3.5.3. Replacing the battery or one fuse).
∗ Any adjustment, maintenance or repair work carried out on the multimeter should
be carried out only by appropriately qualified personnel, after having taken into
account the instructions in this present manual. A "qualified person" is one who
is familiar with the installation, construction and operation of the equipment and the
hazards involved.
This qualified person must be familiar with equipment for explosive atmospheres
and be trained in the general rules for intrinsic safety.
∗ When the instrument is open, for maintenance purposes for example, remember
that some internal capacitors can retain a dangerous potential even after the
instrument is powered down.
∗
Never exceed the protective limiting values given in the characteristics specific to
each type of measurement.

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∗ If any faults or abnormalities are observed, take the instrument out of service and
ensure that it cannot be used until it has been checked out.
∗ It is recommended to remove the battery from the instrument if not used.
1.2. Protection devices
ASYC II series instruments are fitted with various protection devices :
∗
A protection by varistors allows a chopping of transient overvoltages present at
the terminals of measurement.
∗ A PTC (Positive Temperature Coefficient) resistor protects against permanent
overvoltages of up to 600 V during resistance, capacitance and diode test
measurements. This protection is reset automatically after overload.
∗ One F1 intrinsically safe fuse provides protection during current measurements.
∗ A special intrinsic safety case ensures IP 67 sealing.
1.3. Safety devices
∗ The battery unit and fuse cannot be accessed without first disconnecting the
measuring leads.
∗ When measuring voltages above 24 V, the sign blinks on the display.
∗ If the maximum range is repeatedly exceeded, an intermittent audible signal indicates
the risk of electric shock.
1.4. Warranty
This equipment is warranted against any defects of manufacture or materials according to
the general conditions of sale.
During the warranty period (3 years), defective parts will be replaced, the manufacturer
reserving the right to repair or replace the product. In the event of the equipment being
returned to the after sale department or to a local agency, carriage to the centre shall be
payable by the customer.
The warranty does not cover the following :
1. Repairs necessitated by misuse of the equipment or use in association with
incompatible equipment.
2. Modification of the equipment or any related software without the explicit authorization of
the manufacturer.
3. Repairs necessitated by attempts to repair or maintain the product made by a person
not approved by the manufacturer.
4. Adaptation to a specific application not provided for in the specifications of the
equipment or the user manual.
5. Damage after a drop, a shock or flooding.
The contents of this manual must not be reproduced in any form whatsoever without the
consent of the manufacturer.

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1.5. Maintenance
Maintenance of this unit can only be performed by a person who has undergone training on
intrinsic safety rules.
Return your instrument to your distributor for any work to be done within or outside the
guarantee.
1.6. Unpacking - Repacking
This equipment has been fully checked out mechanically and electrically before shipping.
All precautions have been taken to ensure that the instrument arrives at its destination
undamaged.
However, it is advisable to carry out a rapid check for damage sustained in shipping.
If there is any evidence of damage, make this known immediately to the shipper.
Caution Should you need to return the instrument, preferably use the original
packaging and indicate the reasons as clearly as possible on an
accompanying note.

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2. DESCRIPTION
This multimeter is one of the ASYC II (Advanced SafetY Concept, second generation) range,
designed for a high degree of user safety, maximum protection and unrivalled performance.
2.1. Selector switch
This standalone, handheld professional measuring instrument is capable of measuring the
following quantities (accessed by the eight-position rotary selector switch) :
∗AC voltages with AC (or RMS) capacitive coupling
∗AC voltages with AC+DC (or TRMS) direct coupling
∗DC voltages
∗AC currents with AC (or RMS) capacitive coupling
∗AC currents with AC+DC (or TRMS) direct coupling
∗DC currents
∗resistance values
∗continuity (with beeper)
∗capacitance
∗diode threshold voltage
∗frequencies
∗duty cycles
∗pulse counting
∗pulse width
∗dBm
∗ resistive power
∗ temperature
2.2. Keypad
An nine-key keypad lets you :
∗select the autoranging mode (RANGE)
∗store a value (HOLD)
∗measure fast peaks (PK+/-)
∗set the measurement relative to a reference value (REL)
∗select a function derived from the main function, or switch on the multimeter again after it
has been shut down automatically (SEL/ON)
∗select time-domain measurements: frequency, duty cycle, stopwatch, pulse counter (Hz)
∗activate the MIN- MAX- AVG detection mode (SURV)
∗ activate sending data to a printer or a computer (PRINT)
2.3. Display
The display shows :
∗clearly legible figures (14 mm high)
∗an analogue readout of the parameter being measured through a 34-segment bargraph
∗perform 50 000-point measurements (high resolution)
∗perform 5 000-point measurements (low resolution)
2.4. Power supply
It is powered by a standard 9 V (6LF22, 6LR61) battery which provides approximately
300 hours of operation (in V DC mode). It is prohibited to use batteries other than those
specified (see §. 3.5.3. Replacing the battery or fuse).
2.5. Input terminals
Measurements are performed using two measuring leads supplied with the instrument connected
to input terminals 1, 2, 3 and 4, as indicated in §. 3.1.

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3. COMMISSIONING
3.1. Connecting the test leads
Connect the black lead to the COM socket (for all measurements). Depending on the position of
the selector switch, connect the red lead as follows :
Rotary selector switch position Input terminal
V
AC
, mV
DC
, V
DC,
Ω, , °C VΩ
µA mA
DC
µA / 500 mA
3.2. Switching on the instrument
Turn the selector switch to the required function.
All segments of the display come on for a few seconds. The instrument is then ready for
measurements.
3.3. Switching off the instrument
The instrument can be switched off manually by returning the selector switch to the OFF
position, or automatically after approximately half an hour if no key is pressed or the switch is
not operated.
Note Automatic shutdown of the instrument is disabled in order to avoid
interrupting the surveillance mode (SURV), peak measurements (PK+/-), the
pulse counting mode or a data printout.
For user safety, automatic shutdown is also disabled when a measured
magnitude (Voltage / Current) present at the input exceeds dangerous
levels ( indicator displayed).
3.4. Special configurations
To adapt the configuration of the instrument to the measurement environment, the user can:
- Choose 50 Hz or 60 Hz rejection :
Switch on with the rotary switch while holding down the HOLD key. The selection is
reversed from the last configuration, is displayed for two seconds and remains backed
up in non-volatile memory.
- Choose the input impedance for measurements in the mV range :
Switch on with the rotary switch while holding down the RANGE key. The selection is
reversed from the last configuration, is displayed for two seconds, and remains backed
up in non-volatile memory.
- Choose a low resolution mode (5 000 counts) :
Switch on with the rotary switch while holding down the REL key. The selection is
displayed for two seconds.

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3.5. Multimeter maintenance
Any internal intervention can only be performed outside the danger zone.
3.5.1. Fuse self-test
F1 Fuse: When the switch is set to the µA mA position and the (0.500 A, 125 V) F1 fuse
of intrinsic safety is cut, the display shows "FUSE".
Replace it by a fuse of identical model.
F2 Fuse : The (1 A, 600 V, 30 kA) F2 fuse does not have automatic control. To check it,
set the switch to the continuity test position, connect the COM input and the V
input by a cord; if the buzzer is active, the (1 A) F2 fuse is in good condition, if
the buzzer is not active, F2 is out of order.
Replace it by a fuse of identical model.
Note When the F2 fuse is cut, replace it : voltage measurements are possible,
but the specifications are not guaranteed any more. The other types of
measurements are not possible any more.
3.5.2. Battery self-test
When the “BAT” indication is displayed continuously on the display, the instrument still has
approximately 10 hours of operation (in VDC mode), but specifications can no longer be
guaranteed.
Replace the battery.
3.5.3. Replacing the battery or one fuse
Open the multimeter casing as follows (refer to last page of the manual) :
1. Remove the stand from the back of the instrument. Figures 1 and 2
2. Remove the front cover using the stand as a lever. Figure 3
3. Remove the flexible seal.
4. Unscrew the screw maintaining the sealed casinglocated under the movable panel.
5. Replace the battery or fuse.
Before using the unit, check that the flexible seal and the upper case cover are carefully
repositioned.
3.5.4. Cleaning
Clean the multimeter using a damp cloth and soap. Let it dry before using. Do not use
abrasives or solvents.
When changing parts (performed outside the danger zone only, EX class), check
that a fuse of the correct calibre and specified type is used.
Use of a non-compliant fuse and short-circuiting of the fuse holder are strictly prohibited.
Use only a 9 V battery (6LF22, 6LR61) verified as being on the certified list. It is prohibited
to use batteries other than those specified.
Certified batteries : See the list on page 43 of this user manual.
CAUTION: The temperature class depends on the battery used.
Certified fuse : F1 intrinsically safe fuse 0.5 A, 125 V
LITTLEFUSE : part-number 259.500
F2 fuse 1 A, 600 V, 30 kA, 6 x 32 mm

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4. FUNCTIONAL DESCRIPTION
4.1. SEL/ON key
This can be used to switch on the multimeter again after an automatic shutdown. It can also
be used to access secondary functions associated with the selector switch positions.
The flowcharts below define these various functions.
4.1.1. V
AC
position
4.1.2. V
DC
position
dBm measurement
SEL/ON
SEL/ON
AC voltage measurement
E LECTRICAL S PECIFICATIONS OF I NTRINSICALLY S AFE C IRCUITS
U ≤
≤≤
≤60 V (peak value)
E LECTRICAL S PECIFICATIONS OF I NTRINSICALLY S AFE C IRCUITS
U ≤
≤≤
≤60 V (peak value)
SEL/ON
SEL/ON
AC+DC voltage measurement
DC voltage measurement
Resistive power measurement

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4.1.3. mV position
4.1.4. Ω
ΩΩ
Ωposition
4.1.5. position
Warning ! Do not perform capacity measurements in danger zones.
SEL/ON
AC + DC voltage measurement
500 mV range
DC voltage measurement
500 mV range
SEL/ON
SEL/ON
SEL/ON
Continuity test
Resistance measurement
SEL/ON
SEL/ON
Diode voltage measurement
Capacitance measurement

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4.1.6. µA mA DC position
4.1.7. °
°°
°C Position
°C/°F selection and Pt 100 / Pt 1000 selection are saved in non-volatile memory.
Pt 100 selection is indicated by display of Ωsymbol and Pt 1000 by display of kΩsymbol.
Warning ! The use of non-certified probes with this multimeter is not authorised
in danger zones. Only use probes (system manufacturer's certification)
with a certificate of conformity authorising their use with this
multimeter.
SEL/ON
SEL/ON
AC current measurement
DC current measurement
SEL/ON
AC+DC current measurement
E LECTRICAL S PECIFICATIONS OF THE I NTRINSICALLY S AFE C IRCUITS
I ≤
≤≤
≤500 mA
Connections
short
-
circuited
SEL/ON < 1 sec.SEL/ON > 1 sec.
Temperature measurement
Scale selection
°
C
/
°
F
Sensor selection
Pt 100 / Pt 1000
Temperature measurement
with connection resistance
compensation
REL

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4.2. RANGE key
•In AUTO mode, to switch to MANUAL mode (short press).
•In MANUAL mode, to select the next range (short press) or return to AUTO mode (long
press).
Measurements concerned : voltages, capacitance, resistance, currents.
•When making time measurements (frequency, duty cycle, pulse width, pulse count) : if
the range change made during previous measurements (Voltage or Current) was in
manual mode, it may be necessary to adapt this measurement range to the signal level
injected at the input. This is why the RANGE key is used to change from one range
(Voltage or Current) to the next range. The new range is then displayed for 2 seconds.
4.3. REL key
Short press : mode REL, the last value measured becomes the reference value
derived from subsequent measurements.
Long press : When in REL mode, a long press displays the reference being used.
This value may be adjusted using the SEL/ON key (selection of digits
and a sign) and the RANGE key (increment the selected digit).
4.4. PK+/- key
The fast positive or negative peak measurement functions (≥1 ms) can be accessed by
repeatedly pressing this key in the V
DC
, mV
DC
, and mA
DC
functions.
4.5. HOLD key
Short press : Fixes the display on the current value.
Long press : Accesses or quits the autostore mode. Can be accessed in the V
DC
, mV,
V
AC
positions.
Autostore
Set the probes on the point to be measured. An audio signal indicates if the measurement is
stable. When you remove the probes, a second audible signal indicates that this stable value
displayed has been stored.
4.6. ZOOM key
You can press this key to expand the bargraph readout five times for positive measurements
and eleven times for bipolar measurements, one centred around zero (centre zero mode).
Adjusts ohm-value references in dB and resistive power measurements
When the current measurement is dB or resistive power, you can display the resistance
reference with the ZOOM key (long press). This value can then be adjusted using the
SEL/ON and RANGE keys (this value is common to dBm and resistive power
measurements).
You quit the ohm reference adjustment mode with the ZOOM key (short press).

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4.7. SURV key
If you press this key (long press), you access the surveillance mode (or coming out), in which
minimum (MIN), maximum (MAX) and sliding average (AVG) values of the current
measurement are stored (capture time ≥500 ms).
You can look up each of these values by repeatedly pressing the same key (short press). The
symbols MIN, MAX or AVG flicker with the selected value.
Note When entering in the SURV mode, non-coherent values may be displayed
momentarily.
4.8. Hz key
When the current positions are V
AC
, V
DC
, mV, mA, the Hz key invokes, in turn :
- frequency measurement,
- positive duty cycle measurement (% +),
- negative duty cycle measurement (% -),
- positive pulse count ( )
- negative pulse count ( )
- positive pulse width measurements ( )
- negative pulse width measurements ( )
A long press on Hz key allows a direct selection of the voltage or current function.
4.9. PRINT key (for use with optional interface accessory for printer or PC)
Short press : Activates/deactivates « send measurements to printer » mode at the rate
defined by the user.
Long press : Adjusts the rate varying from 00000 s (a single transmission) up to 9h
59min 59s, using the SEL/ON key (selection of digits) and the range key
(increment the selected digit).

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5. TECHNICAL SPECIFICATIONS
Only those values assigned tolerances or limits are guaranteed values. Values without
tolerances are given for information only (French standard NFC 42-670).
{Accuracy : ‘’n% R + nD’’ means ‘’n% of the reading + n digits’’ as per IEC 485}
Note If voltage measurements are out of the specifications or if other
measurements are no longer possible, first check the F2 fuse.
(See §. 3.5.1. Fuse self-test).
5.1. DC voltages
Selector
switch position
Ranges Accuracy Input
impedance Protection Resolution
mV 500 mV 10 MΩ/1GΩ * ± 1100 VPK ***
10 µV
5 V 11 MΩ100 µV
V
DC
50 V
0.025%R ** + 2D
± 1100 VPK 1 mV
(♦) 500 V 10 mV
(♦) 600 V
0.05%R ** + 2D 10 MΩ
100 mV
* Refer to §. 3.4. ** at 23°C ±2°C *** 1 min max.
Number of counts : 50 000 (or 5 000 - refer to §. 3.4.)
Range selection : automatic or manual for the 5 V, 50 V, 500 V, 600 V ranges
Common mode rejection : at 50 and 60 Hz, better than 120 dB
Serial mode rejection : at 50 and 60 Hz, better than 60 dB
Additional error in PK+/- mode for a pulse of ≥1 ms : 1% R ±50 D
For measurements performed on alternative signals, the selected range must tally with the
max. value of the signal peak.
5.2. AC voltages (AC and AC+DC)
Selector
switch
position Ranges Accuracy Input
impedance Protection Reso- lution
DC* 40 Hz to
1 kHz 1 kHz to
4 kHz 4 kHz to
10 kHz 10 kHz to 30 kHz 30 kHz to 50 kHz
from 5 % to 100 % of the range from 10 % to 100 % of the range
mV +
SEL/ON 500 mV* 7 % R + 30 D ///////////// 10MΩ/1G**
// 100 pF ±1100VPK
*** 10 µV
5 V 11MΩ//100pF
100 µV
V AC or 50 V
0.3% R + 30 D
1% R + 30 D
2 % R + 30 D
3% R+ 30 D
± 1100 VPK 1 mV
(♦) 500 V 10 mVV
DC +
SEL/ON
(♦) 600 V
///////////
10MΩ//100pF
100 mV
* AC+DC only ** Refer to §. 3.4. *** 1 min max.
(♦) When the measurement terminals are connected to an intrinsically safe circuit,
the electrical specifications of intrinsically safe circuits must conform following
values : U ≤
≤≤
≤60 V (peak value) or I ≤
≤≤
≤500 mA.
After a use on circuits other than those of intrinsic safety, the user must observe
a period of 3 minutes waiting before carrying the multimeter in a dangerous area
of EX class.

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Number of counts : 50 000 (or 5 000 - refer to §. 3.4.)
Range selection : automatic or manual for the 5 V, 50 V, 500 V,
600 V ranges
Common mode rejection : at 50 and 60 Hz, better than 80 dB
Additional error according to crest factor : 0.2 % for a crest factor of 2 to 3
0.5 % for a crest factor of 3 to 6
(Specification given full scale for a squarewave signal pulse 200 µs wide)
Curve showing typical measurement error (5 V, 50 V, 500 V ranges)
1000 pts
1 kHz 10 kHz 100 kHz
Vin = 100 % F.S.
Vin = 50 % F.S.
Vin = 15 % F.S.
50000 pts
25000 pts
7500 pts
2500 pts
1%
5% 10%
2%
Vin = 5 % F.S.
5.3. DC current
Selector
switch
position Ranges Accuracy Max.
voltage
drop Protection Fuse* Resolution
500 µA 0.2%R + 5 D
10 nA
5 mA 0.2%R + 2 D
100 nA
50 mA 0.05%R+2 D
700 mV 1 µA
µA mA
500 mA 0.2%R + 2 D
1.5 V
600 V RMS F1
10 µA
* Refer to fuse specifications, §. 6.1.1.
Number of counts : 50 000 (or 5 000 - refer to §. 3.4.)
Range selection : automatic or manual for the 500 µA, 5 mA,
50 mA, 500 mA ranges
Additional error in PK+/- mode for a pulse width of ≥1 ms : 1 % R ±50 D
For measurements performed on alternative signals, the selected range must tally with the
max. value of the signal peak.
5.4. AC currents (AC and AC+DC)
Ranges Accuracy Protection Fuse* Resolution Max. Crest
40 Hz to 5 kHz5 % to 100 % of range
500 µA 0.75 % R + 30 D 10 nA 1 mA
5 mA 100 nA 10 mA
50 mA 0.6 % R + 30 D 1 µA 100 mA
500 mA 0.7 % R + 30 D
600 V RMS F1
10 µA 1 A
* Refer to fuse specifications, §. 6.1.1.

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Number of counts : 50 000 (or 5 000 - refer to §. 3.4.)
Range selection : automatic or manual for the 500 µA, 5 mA, 50 mA,
500 mA ranges
Additional error according to crest factor : 0.2 % for a crest of 2 to 3
0.5 % for a crest of 3 to 6
(Specification given full scale for a squarewave signal pulse 200 µs wide)
Additional error in IAC+DC with a direct current at input : 1 %
5.5. Resistance / Continuity
Ranges Accuracy Measurement
current Protection∗Resolution
500 Ω / 0.07% R + 8 D 1 mA 10 mΩ
5 kΩ0.07% R + 5 D 100 µA 100 mΩ
50 kΩ10 µA 1 Ω
500 kΩ0.07% R + 2 D 1 µA 10 Ω
5 MΩ∗∗ 0.3% R + 2 D 100 nA 100 Ω
50 MΩ∗∗ 1% R + 2 D 50 nA
600 V RMS
1 kΩ
∗Overload protection can be reset automatically.
∗∗ It is highly recommended to use very short and shielded test leads for measurements in
this range (> 1 MΩ).
Number of counts : 50 000 (or 5 000 - refer to §. 3.4.)
Range selection : automatic or manual (fixed in continuity mode)
Maximum open circuit voltage : 7 V
Detection threshold in continuity mode : 10 Ωto 20 Ω
Response time in continuity mode : 1 ms
5.6. Capacitance
Discharge all capacitors before performing measurements.
Ranges Accuracy Measurement current Max measurement
time
Protection ∗
Resolution
50 nF∗∗ 100 nA 10 pF
500 nF 1 µA 100 pF
5 µF 10 µA 1 nF
50 µF 100 µA
0.5 s
10 nF
500 µF 1.5 s 100 nF
5000 µF 1 µF
50 mF
1% R + 2 D
1 mA 3 s/mF
600 V RMS
10 µF
∗Overload protection can be reset automatically.
∗∗ It is highly recommended to use very short and shielded test leads for measurements in
this range.
Number of counts : 5 000
Range selection : automatic or manual
Maximum open circuit voltage : 7 V
Caution ! Do not perform capacitance measurements in dangerous zones.

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40
5.7. Diode threshold voltage measurement
Measurable voltages : 0 to 2 V
Measurement current : 1 mA ± 20 %
Resolution : 1 mV
Protection : 600 V RMS , can be reset automatically.
5.8. dB function
Displays measured values in dBm relative to a resistance reference which can be adjusted
from 1 to 9999 ohms and backed up in non-volatile memory (factory-set to 600 ohms, refer to
adjustment procedure in §. 4.6).
Resolution : 0.01 dB
Absolute error in dB : 0.09 x V
AC
relative error as a percent
Additional computation error : ± 0.01 dB
Measurement range : 10 mV
AC
to 600 V
AC
( ♦ )
Protection : ± 1100 V
5.9. Resistive power function
Displays resistive power relative to a resistance reference which can be adjusted from 1 to
9999 ohms and backed up in non-volatile memory (factory-set to 600 ohms, refer to
adjustment procedure in §. 4.6.).
Measured function is : (measured voltage)
2
/ Rref
Resolution : 100 µW
Accuracy : 2 x V
AC
accuracy (%)
Measurement max. voltage : 600 V
AC + DC
( ♦ )
Protection : ± 1100 V
Display unit : VA
5.10. Frequencies
Selector switch setting : V
AC
, mV, V
DC
, mA
Measurement range : 0.62 Hz to 500 kHz
Accuracy : 0.03 % ± D
Protection : 1100 V in V
AC
, mV, V
DC
modes
600 V RMS (F1) in mA mode
Display : 50 000 counts
SENSITIVITY
Range 500 µA
to 500 mA 500 mV 5 V to 500 V
(♦) 600 V
(♦)
0,62 Hz to 5 kHz* 3 % of range 5 % of range 2 % of range 100 V
5 kHz to 50 kHz 5 % of range 6 % of range 5 % of range 250 V
50 kHz to 500 kHz 10 % of range ///////////// 10 % of range /////////////
* rectangular signal
Additional positive limit in DC : + 3 % of range, except in 600 V
DC
range (150 V additional)
( ♦ ) Refer to page 37.

Chapter II X02137C00 - Ed. 1 - 06/07
Intrinsically safe portable digital multimeter
41
5.11. Duty cycle: %+, %-
θ
T
θ
T% - =
θ
Tx 100
% + =
θ
Tx 100
Resolution : 0.01%
Minimum duration for θor T - θ : 2 µs
Maximum duration for T : 0.8 s
Minimum duration for T : 100 µs
Absolute error as a % :
310
4
.
−
T
Sensitivity : Refer to sensitivity in frequency measurement mode
Absolute additional error on θ, due to the zero crossing slope : 0.1 x
C
P
with C : V or A range (C : 5000 V for 600 V
DC
or 600 V
AC
ranges
with P : slope in V/s or in A/s
5.12. Positive ( ) or negative ( ) pulse count
Minimum pulse duration : 2 µs
Count up to : 99999
Limit of triggering : 3 % of range except in :
600 V
AC
and 600 V
DC
ranges (limit : 150 V)
This limit is positive in ( ) and negative in ( ).
Reset the count to zero with the REL key.
5.13. Positive ( ) or negative ( ) pulse width
Resolution : 10 µs
Minimum pulse width : 20 µs
Accuracy : 0.1 % ± 10 µs
Maximum duration of a period : 12.5 s
Limit of triggering : 3 % of range except in :
600 V
AC
and 600 V
DC
ranges (limit : 150 V).
This limit is positive in ( ) and negative in ( ).
Additional error on measurement due to the zero crossing slope : refer to duty cycle
measurement.
5.14. Temperature function
Temperature range : -200
°C to + 800 °C
Resolution : 0.1 °C
Accuracy : ±1 °C from -150 °C to -125 °C
±0.5 °C from -125 °C to 75 °C
±1 °C from 75 °C to 700 °C
Temperature sensors * : platinum probes Pt 100 or Pt 1000
Unity * : °C or °F
Connection* resistance compensation with REL key
* refer to §. 4.1.7. for Pt 100/Pt 1000 selection, °C / ° F selection and connection resistance
compensation procedure.
Warning ! Only use probes (system manufacturer's certification) with a
certificate of conformity authorising their use with this multimeter.

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42
6. GENERAL SPECIFICATIONS
Adjustment
The MX 57 EX multimeter incorporates a non-volatile memory containing the adjustment
characteristics for all measurement ranges. It is supplied with a certificate of conformity.
Safety
acc. to IEC 61010-1 Ed. 2 (2001)
Insulation class 2
Degree of pollution 2
Utilisation indoor
Altitude < 2000 m
Measurement category
of "measurement" inputs CAT III, 600 V in relation to earth
Intrinsic Safety
As per Directive ATEX 94/9/CE II 2G D ou I M2
EN 60079-0 (2004), EN 60079-11 (2007),
EN 61241-11 (2006)
EC type Examination Certificate LCIE 02 ATEX 6005X
Supplementary EC type Examination Certificate LCIE 02 ATEX 6005X / 01
Amendment to EC Examination Certificate type LCIE 02 ATEX 6005 X / 02
As per the IECEx Certification System IEC 60079-0 (2004), IEC 60079-11 (1999),
IEC 61241-0 (2004), IEC 61241-11 (2005)
Certificate IECEx LCI 07.0010X
Type of protection ATEX and IECEx
Ex ib I
Ex ib IIC T5 or T4 or T3
Ex ib D 21 T
The battery must be replaced outside danger zone only.
Casing FR90 Bayblend, RD 3020 (red)
Labels sticking polycarbonat, 8A85 quality
PCB’s IRC > 100
Protecting varnish IRC (2 layers) > 100
Environment
Reference temperature 18°C to 28°C
Rated range of use 0°C to 50°C
Limit range of operation -10°C to 60°C
Storage temperature range -40°C to 70°C
Temperature coefficient max 0.1 x accuracy /°K
max. 0,2 x accuracy /°K in V DC and 50 mA DC
Relative humidity 0 to 80% from 0°C to 40°C (70% max. for 5 MΩ/50 MΩ),
0 to 70% from 40°C to 50°C,
60% above 50°C
Max. temperature of use
in danger zone ≤ 40 ° C