SEFRAM MW3366 User manual
USER MANUAL
MW3366
600A
TRMS AC+DC
CLAMP METER
1
1) SAFETY
This manual contains information and warnings that must be followed for operating the
meter safely and maintaining the meter in a safe operating condition. If the meter is
used in a manner not specified by the manufacturer, the protection provided by the
meter may be impaired.
Observe proper safety precautions when working with voltages above 30 Vrms, 42.4
Vpeak or 60 VDC. These voltage levels pose a potential shock hazard to the user. Do
not expose this product to rain or moisture. The meter is intended only for indoor use.
Keep your hands/fingers behind the hand/finger barriers (of the meter and the test
probe assembly, where applicable) that indicate the limits of safe access of the hand-
held parts during measurements. Inspect lead wires, connectors, and probes for
damaged insulation or exposed metal periodically. If any defects are found, replace
them immediately. Only use the test probe assembly provided with the meter or a UL
Listed test probe assembly to the same meter ratings or better.
Optional offer premium test probe assembly using silicone lead wire insulation, at
agent’s discretion, is equipped with white inner insulation layers as wear indicators.
Replace them immediately if any of the white layers has become visible.
Disconnect the test leads from the test points before changing functions.
The meter meets IEC/EN/BSEN/CSA_C22.2_No./UL standards of 61010-1 Ed. 3.1 and
61010-2-032 Ed. 4.0 to Measurement Categories CAT III 600V and CAT IV 300V AC &
DC
The accompanied test probe assembly meets IEC/EN/BSEN/CSA_C22.2_No./UL
standards of 61010-031 Ed. 2.0 to the same meter ratings or better. The 61010-031
requires exposed conductive test probe tips to be ≤ 4mm for CAT III & CAT IV ratings.
Refer to the category markings on your probe assemblies as well as on the add-on
accessories (like detachable Caps or Alligator Clips), if any, for applicable rating
changes.
2
INTERNATIONAL SYMBOLS
Marking of Electrical and Electronic Equipment (EEE). Do not dispose of this
product as unsorted municipal waste. Contact a qualified recycler.
Refer to the explanation in this Manual.
Possibility of electric shock
Earth (Ground)
Meter protected throughout by Double Insulation or Reinforced insulation
Fuse
Direct Current (DC)
Alternating Current (AC)
3 Three-phase Alternating Current
Application around and removal from hazardous live conductors is permitted
Brief Information about Measurement Categories
Measurement Category IV is applicable to test and measuring circuits connected at
the source of the building’s low-voltage MAINS installation. Examples are
measurements on devices installed before the main fuse or circuit breaker in the
building installation.
Measurement Category III is applicable to test and measuring circuits connected to
the distribution part of the building’s low-voltage MAINS installation. Examples are
measurements on distribution boards (including secondary meters), circuit-breakers,
wiring, including cables, bus-bars, junction boxes, switches, socket-outlets in the fixed
installation, and equipment for industrial use and some other equipment such as
stationary motors with permanent connection to the fixed installation.
Measurement Category II is applicable to test and measuring circuits connected
directly to utilization points (socket outlets and similar points) of the low-voltage MAINS
installation. Examples are measurements on MAINS CIRCUITS of household
appliances, portable tools and similar equipment.
2) EUROPEAN DIRECTIVES AND UK STATUTORY REQUIREMENTS
The instruments conform to EUROPEAN (CE) Low-Voltage Directive 2014/35/EU,
Electromagnetic Compatibility Directive 2014/30/EU, and RoHS 2 Directive 2011/65/EU
plus amendment Directive (EU) 2015/863. The instruments also conform to the UK
(UKCA) Electrical Equipment (Safety) Regulations 2016, Electromagnetic Compatibility
Regulations 2016, and The Restriction of the Use of Certain Hazardous Substances in
Electrical and Electronic Equipment Regulations 2012.
3
3) PRODUCT DESCRIPTION
1) Antenna area for Non-Contact
EF-Detection
2) Jaw center indicator (with DCA
polarity), at where best current
accuracy is specified
3) Rotary Selector to turn the
power ON/OFF and Select a
function
4) 3-5/6 digits 6000 counts
numeric LCD display
5) Input Jack for all functions
EXCEPT non-invasive DCA,
DC+ACA, or ACA current
functions
6) Common (Ground reference)
Input Jack for all functions
EXCEPT non-invasive DCA,
DC+ACA, or ACA current
functions
7) Push-buttons for special
functions & features.
8) Jaw trigger for opening the
clamp jaw
9) Hand/Finger Barrier to indicate
the limits of safe access of the
meter
10) Clamp Jaw for DC or AC
current magnetic field pick up
11) Additional center indicator for
AmpTipTM Low-current function,
at where best AmpTipTM current accuracy is specified
4
4) OPERATION
WARNING: Before and after hazardous voltage measurements, test the voltage
function on a known source such as line voltage to determine proper meter functioning.
ACV, DCV, DC+ACV, & Line-level Hz functions
Inputs are made through the test lead terminals COM/+. Defaults at ACV* Function.
Press SELECT button momentarily to select DCV, DC+ACV or Line-level Hz function
in sequence.
Note:
*ACV (and hence AC+DCV & Line-level Hz) function is equipped with digital low-pass
filter, and is capable of dealing with VFD (Variable Frequency Drives) signals. It also
improves ACV reading stability in noisy electrical environments.
5
Electric Field EF-Detection
The meter displays “EF” when it is ready. Signal strength is indicated as a series of
bar-graph segments on the display together with variable beep tones.
●Non-Contact EF-Detection: An antenna is located along the top-right end of the
stationary clamp jaw, which detects electric field surrounds energized conductors. It is
ideal for tracing live wiring connections, locating wiring breakage and to distinguish
between live or earth connections.
●Probe-Contact EF-Detection: For more precise indication of live wires, such as
distinguishing between Live and Ground connections, use one single probe to test via
terminal COM for direct contact EF-Detection with best sensitivity.
6
NOTES for Non-Invasive (Clamp-on) Current Measurements:
NOTE
(Application and Removal of the Clamp-on Jaws) 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. Align the conductor(s) to the Jaws center indicators
(Regular or AmpTip™ indicators where applicable) 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
may affect measurement accuracy. Keep the jaws away from them as much as
possible to minimize influence.
NOTE
Do not use the meter to measure currents above the rated frequency (400Hz).
Circulating currents may cause the magnetic circuits of the Jaws reach a hazardous
temperature.
7
Non-Invasive AmpTipTM Low-Current Functions:
ACA, DCA, DC+ACA & Hz
Input is made via the clamp jaws with best accuracy specified near the jaw tip area for
small conductors low-current measurements. Defaults at ACA function. Press SELECT
button momentarily to select the subject functions in sequence.
Non-Invasive Regular Current Functions:
ACA, DCA, DC+ACA, & Hz
Input is made via the clamp jaws with best accuracy specified at the jaw center for
regular current measurements. Press SELECT button momentarily to select the subject
functions in sequence.
8
Resistance, Continuity, & Diode functions
Inputs are made through the test lead terminals COM/+. Defaults at Resistance.
Press SELECT button momentarily to select the subject functions in sequence.
9
NOTE
When using Diode test function, normal forward voltage drop (forward biased) for a
good silicon diode is between 0.400V to 0.900V. A reading higher than that indicates a
leaky diode (defective). A zero reading indicates a shorted diode (defective). An OL
indicates an open diode (defective). Reverse the test leads connections (reverse
biased) across the diode. The digital display shows OL if the diode is good. Any other
readings indicate the diode is resistive or shorted (defective).
NOTE
Using Resistance, Continuity or Diode function in a live circuit will produce false results
and may damage the meter. In many cases, the suspected component(s) must be
disconnected from the circuit to obtain an accurate measurement reading.
Capacitance functions
Inputs are made through the test lead terminals COM/+.
NOTE
1. Using Capacitance function in a live circuit will produce false results and may
damage the meter. In many cases the suspected component(s) must be disconnected
from the circuit to obtain an accurate measurement reading.
Table of contents
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