Sefram MW3366 600A TRMS AC+DC Clamp Meter User Manual

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

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 f unction
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

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

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.
2. 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:

1. Rotary switch or push button operations
2. Significant measuring readings of above 8.5% of ranges
3. Non-OL readings for Resistance, Continuity or Diode function
4. Non-zero readings for Hz function
5. 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: 0C to 40C

• Relative Humidity: Maximum relative humidity 80% for temperature up to 31C decreasing linearly to 50% relative humidity at 40C

• Pollution degree: 2

• Storage Temperature: -20C to 60C, < 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 23C  5C.
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

Input Impedance: 10M, 100 pF nominal

AC Voltage (with Digital Low-Pass Filter)

50Hz ~ 60Hz
600.0V| 1.0% + 5d

Input Impedance: 10M, 100 pF nominal

DC+AC Voltage (with Digital Low-Pass Filter)

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

Open Circuit Voltage: 1.0VDC typical

Capacitance

Accuracies with film capacitor or better

Diode Tester

Test Current: 0.3mA typically
Open Circuit Voltage: < 3.5VDC typically

AmpTipTM clamp-on ACA

50Hz ~ 60Hz
60.00A| 1.5% + 5d

1. Induced error from adjacent current-carrying conductor:
   <0.01A/A for Models

2. Specified with Relative Zero mode applied to offset the non-zero residual readings, if any

3. Add 10d to the specified accuracy @ < 4A

AmpTipTM clamp-on DCA

1. Induced error from adjacent current-carrying conductor: <0.01A/A
2. Specified with DC-Zero mode applied to offset the non-zero residual readings, if any
3. Add 10d to the specified accuracy @ < 4A

AmpTipTM clamp-on DC+ACA

DC, 50Hz ~ 60Hz
60.00A| 2.0% + 7d

1. Induced error from adjacent current-carrying conductor: <0.01A/A
2. Specified with DC-Zero mode applied to offset the non-zero residual readings, if any
3. Add 10d to the specified accuracy @ < 4A

Regular Clamp-on ACA

50Hz ~ 100Hz
60.00A 4) 5), 600.0A| 1.8% + 5d
100Hz ~ 400Hz
60.00A 4) 5), 600.0A| 2.0% + 5d

1. Induced error from adjacent current-carrying conductor:
   <0.01A/A for Models

2. 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

1. Induced error from adjacent current-carrying conductor: <0.01A/A
2. Specified with DC-Zero mode applied to offset the non-zero residual readings, if any
3. Add 10d to the specified accuracy @ < 9A

Regular Clamp-on DC+ACA

DC, 50Hz ~ 100Hz
60.00A 3), 600.0A| 2.2% + 7d
100Hz ~ 400Hz
60.00A 3), 600.0A| 2.7% + 7d

1. Induced error from adjacent current-carrying conductor: < 0.01A/A
2. Specified with DC-Zero mode applied to offset the non-zero residual readings, if any
3. Add 10d to the specified accuracy @ < 9A

Hz Line Level Frequency

Accuracy: 1%+5d

1. DC-bias, if any, not more than 50% of Sine RMS

Non-Contact EF-Detection

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

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References

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