Sefram MW3366 600A TRMS AC+DC Clamp Meter User Manual
- June 10, 2024
- Sefram
Table of Contents
Sefram MW3366 600A TRMS AC+DC Clamp Meter
Product Information
Model: MW3366
The MW3366 is a 600A TRMS AC+DC Clamp Meter that is designed to measure AC/DC voltage, AC/DC current, resistance, frequency, diode,continuity, and non- contact electric field detection. The meter is built with safety features to protect the user from potential shock hazards. It 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.
Product Usage
Before using the MW3366 clamp meter, read the safety instructions provided in the user manual carefully. Observe proper safety precautions when working with voltages above 30 Vrms, 42.4 Vpeak or 60 VDC. The meter is intended for indoor use only, and it should not be exposed to rain or moisture.
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. Disconnect the test leads from the test points before changing functions.
The MW3366 clamp meter comes with a non-contact electric field detection feature, and it can measure DC or AC current magnetic field pick up using the clamp jaw. The meter has a rotary selector to turn the power ON/OFF and select a function. The numeric LCD display shows 3-5/6 digits and can display various measurements such as voltage, current, resistance, frequency, diode, and continuity.
The meter also has a jaw center indicator (with DCA polarity) that indicates where the best current accuracy is specified. The hand/finger barrier is used to indicate the limits of safe access of the meter during measurements. The meter is equipped with push-buttons for special functions and features, and the jaw trigger is used for opening the clamp jaw.
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. If you have any questions about using the MW3366 clamp meter, refer to the user manual or contact customer support for assistance.
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.
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)
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.
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.
PRODUCT DESCRIPTION
- Antenna area for Non-Contact EF-Detection
- Jaw center indicator (with DCA polarity), at where best current accuracy is specified
- Rotary Selector to turn the power ON/OFF and Select a f unction
- 3-5/6 digits 6000 counts numeric LCD display
- Input Jack for all functions EXCEPT non-invasive DCA, DC+ACA, or ACA current functions
- Common (Ground reference) Input Jack for all functions EXCEPT non-invasive DCA,DC+ACA, or ACA current functions
- Push-buttons for special functions & features.
- Jaw trigger for opening the clamp jaw
- Hand/Finger Barrier to indicate the limits of safe access of the meter
- Clamp Jaw for DC or AC current magnetic field pick up
- Additional center indicator for AmpTipTM Low-current function,at where best AmpTipTM current accuracy is specified
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.
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.
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.
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.
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.
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).
- 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
- 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.
- When using Capacitance function, discharge capacitor(s) before making any measurements. Large value capacitors should be discharged through an appropriate resistance load
Hold
Hold feature freezes the display for later view. LCD “ ” turns on. Press the
HOLD button momentarily to toggle the hold feature.
Record mode
Press REC button momentarily to activate MAX/MIN/AVG recording mode. LCD “ ” &
“MAX MIN AVG” turn on. The meter beeps when new MAX (maximum) or MIN (minimum)
reading is updated. AVG (Average) reading is calculated over time. Press the
button momentarily to read the MAX, MIN and AVG readings in sequence. Press
the button for 1 second or more to exit this mode. Auto-Power-Off is disabled
automatically in this mode.
Relative-Zero ( ZERO) mode
Relative-Zero allows the user to offset the meter consecutive measurements
with the main display displaying reading as the reference value. LCD “ ” turns
on. Press the ZERO (HOLD) button for one second or more to toggle Relative-
Zero mode. DC-Zero mode is set instead of Relative-Zero mode, however, to only
offset the non-zero DCA residuals caused by magnetic hysteresis of the jaws as
in DCA & DC+ACA functions. Press the ZERO (HOLD) button for one second or more
to activate/ re-activate this mode. Apply this mode before making any single
DCA or DC+ACA measurement for best measuring accuracy. The meter shows “dc_0”
shortly to confirm activation before continuing measurements. The beeper will
sound 3 short beeps, however, to warn for null activation if the residual is
beyond a reasonable hysteresis reading of -5 to 5 DCA.
80ms PEAK-RMS mode
Press PEAK-RMS button for one second or more to toggle PEAK-RMS mode to
capture inrush current or voltage RMS values in duration as short as 80ms. LCD
P-RMS turns on. Auto-Power-Off is disabled automatically in this mode.
Backlighted LCD display
Press the SELECT button for 1 second or more to toggle the LCD backlight. The
backlight will also be turned off automatically after 32 seconds to extend
battery life.
Intelligent Auto-Power-Off (APO)
The Auto-Power-off (APO) mode turns the meter off automatically to extend battery life after approximately 32 minutes of no specified activities, where applicable:
- Rotary switch or push button operations
- Significant measuring readings of above 8.5% of ranges
- Non-OL readings for Resistance, Continuity or Diode function
- Non-zero readings for Hz function
- Significant movement indication as in Phase Rotation functions
In other words, the meter will intelligently avoid entering the APO mode when it is under normal measurements. To wake up the meter from APO, press the SELECT button momentarily and release, or turn the rotary switch OFF and then back on. Always turn the rotary switch to the OFF position when the meter is not in use.
MAINTENANCE
NOTE
To avoid electrical shock, disconnect the meter from any circuit, remove the test leads from the input jacks and turn OFF the meter before opening the case. Do not operate with open case.
Trouble Shooting
If the instrument fails to operate, check batteries and test leads etc., and
replace as necessary. Double check operating procedure as described in this
user’s manual.
If the instrument voltage-resistance input terminal has subjected to high
voltage transient (caused by lightning or switching surge to the system under
test) by accident or abnormal conditions of operation, the protective
impedance components in series might be blown off (become high impedance) like
open fuses to protect the user and the instrument. Most measuring functions
through this terminal might then be open circuit. Such components should only
be replaced by qualified technician. Refer to the LIMITED WARRANTY section for
obtaining warranty or repairing service.
Accuracy and Calibration
Accuracy is specified for a period of one year after calibration. Periodic
calibration at intervals of one year is recommended to maintain meter
accuracy. Refer to the LIMITED WARRANTY section for obtaining calibration,
repairing or warranty service.
Cleaning and Storage
Periodically wipe the case with a damp cloth and mild detergent; do not use
abrasives or solvents. If the meter is not to be used for periods of longer
than 60 days, remove the batteries and store them separately.
Battery replacement
The meter uses standard 1.5V AAA Size (IEC R03) battery X 2
Loosen the 2 captive screws from the battery cover case. Lift the battery
cover case. Replace the batteries. Replace battery cover case. Re-fasten the
screws.
GENERAL SPECIFICATIONS
-
Display: 3-5/6 digits 6000 counts.
-
Polarity: Automatic
-
Update Rate: 5 per second nominal.
-
Operating Temperature: 0C to 40C
-
Relative Humidity: Maximum relative humidity 80% for temperature up to 31C decreasing linearly to 50% relative humidity at 40C
-
Pollution degree: 2
-
Storage Temperature: -20C to 60C, < 80% R.H. (with battery removed)
-
Altitude: Operating below 2000m
-
Temperature Coefficient: nominal 0.15 x (specified accuracy)/ C @(0C — 18C or 28C — 40C), or otherwise specified
-
13 Sensing: True RMS
-
Safety: Certified per IEC/EN/CSA_C22.2_No./UL standards: 61010-1 Ed. 3.1, 61010-2-032 Ed. 4.0, & 61010-031 Ed. 2.0 to Measurement Categories CAT III 600V and CAT IV 300V ac & dc
-
Transient Protection: 6.0kV (1.2/50s surge)
-
Overload Protections: Current & Hz functions via jaws: 600ADC/AAC rms at <400Hz
Voltage & 3-Phase Rotation functions via terminals: 660VDC / 920VAC rms Other functions via terminals: 600VDC/VAC rms -
E.M.C.: Meets EN61326-1
-
DCA and DC+ACA Functions, in an RF field of 1V/m:
Total Accuracy = Specified Accuracy + 20 digits at around 405MHz DCA and Ohm Functions, in an RF field of 1V/m:
Total Accuracy = Specified Accuracy + 25 digits -
Other Functions, in an RF field of 3V/m:
Total Accuracy = Specified Accuracy + 20 digits -
Power Supply: 1.5V AAA Size battery X 2
-
Power Consumption: Typical 13mA for Current functions
-
Low Battery:
Below approx. 2.85V for Capacitance & Hz
Below approx. 2.5V for other functions -
APO Timing: Idle for 32 minutes
-
APO Consumption: 5A typical
-
Dimension (LxWxH): 223 x 76 x 37mm
-
Weight: 234g
-
Jaw opening & Conductor diameter: 35mm max
-
Accessories: Test lead set, User’s manual, Soft carrying pouch,
-
Special Features: AmpTipTM low-current range; MAX/MIN/AVG Recording mode; Display Hold; EF-Detection (NCV); Backlighted LCD; 80ms Peak-RMS mode for inrush current; Relative-Zero
Electrical Specifications
Accuracy is (% reading digits + number of digits) or otherwise specified, at
23C 5C.
Maximum Crest Factor < 2.5: 1 at full scale & < 5: 1 at half scale or
otherwise specified, and with frequency spectrum not exceeding the specified
frequency bandwidth for non-sinusoidal waveforms.
DC Voltage
RANGE | Accuracy |
---|---|
600.0V | 1.0% + 5d |
Input Impedance: 10M, 100 pF nominal
AC Voltage (with Digital Low-Pass Filter)
RANGE | Accuracy |
---|
50Hz ~ 60Hz
600.0V| 1.0% + 5d
Input Impedance: 10M, 100 pF nominal
DC+AC Voltage (with Digital Low-Pass Filter)
RANGE | Accuracy |
---|
DC, 50Hz ~ 60Hz
600.0V| 1.2% + 7d
Input Impedance: 10M, 100 pF nominal
PEAK-rms (ACV & ACA)
Response: 80ms to > 90%
Audible Continuity Tester
Audible Threshold: At between 10 and 250 Response time: 32ms approx.
Ohm
RANGE | Accuracy |
---|---|
600.0W, 6.000KW, 60.00KW | 1.0% + 5d |
Open Circuit Voltage: 1.0VDC typical
Capacitance
RANGE | Accuracy 1) |
---|---|
200.0mF, 2500mF | 2.0% + 4d |
Accuracies with film capacitor or better
Diode Tester
RANGE | Accuracy |
---|---|
2.000V | 1.5% + 5d |
Test Current: 0.3mA typically
Open Circuit Voltage: < 3.5VDC typically
AmpTipTM clamp-on ACA
RANGE | Accuracy1) 2) 3) 4) |
---|
50Hz ~ 60Hz
60.00A| 1.5% + 5d
-
Induced error from adjacent current-carrying conductor:
<0.01A/A for Models -
Specified with Relative Zero mode applied to offset the non-zero residual readings, if any
-
Add 10d to the specified accuracy @ < 4A
AmpTipTM clamp-on DCA
RANGE | Accuracy1) 2) 3) |
---|---|
60.00A | 2.0% + 5d |
- Induced error from adjacent current-carrying conductor: <0.01A/A
- Specified with DC-Zero mode applied to offset the non-zero residual readings, if any
- Add 10d to the specified accuracy @ < 4A
AmpTipTM clamp-on DC+ACA
RANGE | Accuracy1) 2) 3) |
---|
DC, 50Hz ~ 60Hz
60.00A| 2.0% + 7d
- Induced error from adjacent current-carrying conductor: <0.01A/A
- Specified with DC-Zero mode applied to offset the non-zero residual readings, if any
- Add 10d to the specified accuracy @ < 4A
Regular Clamp-on ACA
RANGE | Accuracy 1) 2) 3) |
---|
50Hz ~ 100Hz
60.00A 4) 5), 600.0A| 1.8% + 5d
100Hz ~ 400Hz
60.00A 4) 5), 600.0A| 2.0% + 5d
-
Induced error from adjacent current-carrying conductor:
<0.01A/A for Models -
Maximum Crest Factor < 2: 1 at full scale & < 4 : 1 at half scale 4) add 10d to the specified accuracy @ < 9A
Regular Clamp-on DCA
RANGE | Accuracy 1) 2) |
---|---|
60.00A 3), 600.0A | 2.0% + 5d |
- Induced error from adjacent current-carrying conductor: <0.01A/A
- Specified with DC-Zero mode applied to offset the non-zero residual readings, if any
- Add 10d to the specified accuracy @ < 9A
Regular Clamp-on DC+ACA
RANGE | Accuracy 1) 2) |
---|
DC, 50Hz ~ 100Hz
60.00A 3), 600.0A| 2.2% + 7d
100Hz ~ 400Hz
60.00A 3), 600.0A| 2.7% + 7d
- Induced error from adjacent current-carrying conductor: < 0.01A/A
- Specified with DC-Zero mode applied to offset the non-zero residual readings, if any
- Add 10d to the specified accuracy @ < 9A
Hz Line Level Frequency
Function | Sensitivity 1) (Sine RMS) | Range |
---|---|---|
600V | 50V | 5.00Hz ~ 999.9Hz |
60A (AmpTipTM) | 40A | 50.00Hz ~ 400.0Hz |
60A, 600A | 40A | 50.00Hz ~ 400.0Hz |
Accuracy: 1%+5d
- DC-bias, if any, not more than 50% of Sine RMS
Non-Contact EF-Detection
Typical Voltage | Bar-Graph Indication |
---|---|
20V (tolerance: 10V ~ 36V) | – |
55V (tolerance: 23V ~ 83V) | – – |
110V (tolerance: 59V ~ 165V) | – – – |
220V (tolerance: 124V ~ 330V) | – – – – |
440V (tolerance: 250V ~ 600V) | – – – – – |
Indication: Bar-graph segments & audible beep tones proportional to the
field strength Detection Frequency: 50/60Hz
Detection Antenna: Inside the top side of the stationary jaw
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.
LIMITED WARRANTY
SEFRAM warrants to the original product purchaser that each product it
manufactures will be free from defects in material and workmanship under
normal use and service within a period of one year from the date of purchase.
SEFRAM’s warranty does not apply to accessories, fuses, fusible resistors,
spark gaps, varistors, batteries or any product which, in SEFRAM’s opinion,
has been misused, altered, neglected, or damaged by accident or abnormal
conditions of operation or handling.
To obtain warranty service, contact your nearest SEFRAM authorized agent or
send the product, with proof of purchase and description of the difficulty,
postage and insurance prepaid, to SEFRAM INSTRUMENTS. SEFRAM assumes no risk
for damage in transit. SEFRAM will, at its option, repair or replace the
defective product free of charge. However, If SEFRAM determines that the
failure was caused by misused, altered, neglected, or damaged by accident or
abnormal conditions of operation or handling, you will be billed for the
repair.
THIS WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED
OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OR
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR USE. SEFRAM WILL NOT BE
LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES.
SEFRAM
32 Rue Edouard Martel, BP55, 42009 Saint-Etienne – France
04 77 59 01 01
http://www.sefram.com
PRINTED ON RECYCLABLE PAPER,
References
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