Extech MM750W Operating Manual
USER MANUAL
Wireless Datalogging CAT IV True RMS Multimeter
Model MM750W
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Table of contents
Introduction ...................................................................................................... 3
FEATURES ............................................................................................................................................... 3
Safety ............................................................................................................... 3
Meter Description ............................................................................................. 6
Control Buttons ................................................................................................. 7
Display Symbols ................................................................................................ 7
Multimeter Operating Instructions .................................................................... 8
AUTORANGING/MANUAL RANGE SELECTION ............................................................................................ 8
MAXIMUM (MAX), MINIMUM (MIN), and MAX minus MIN modes .............................................................. 8
RELATIVE ZERO MODE ............................................................................................................................. 8
LCD BACKLIGHT ...................................................................................................................................... 9
DATA HOLD ............................................................................................................................................. 9
AUTO POWER OFF (APO) ......................................................................................................................... 9
LOW BATTERY INDICATION ...................................................................................................................... 9
DC VOLTAGE MEASUREMENTS ............................................................................................................... 10
AC VOLTAGE, FREQUENCY, DUTY CYCLE MEASUREMENTS ......................................................................... 10
DC CURRENT MEASUREMENTS .............................................................................................................. 11
AC CURRENT, FREQUENCY, DUTY CYCLE MEASUREMENTS ........................................................................ 12
CLAMP ADAPTOR MEASUREMENTS AC/DC ............................................................................................. 13
RESISTANCE MEASUREMENTS ................................................................................................................ 14
CONTINUITY CHECK .............................................................................................................................. 14
DIODE TEST .......................................................................................................................................... 15
CAPACITANCE MEASUREMENTS ............................................................................................................. 15
TEMPERATURE MEASUREMENTS ............................................................................................................ 16
NCV NON-CONTACT (EF) VOLTAGE MEASUREMENTS ................................................................................ 16
Wireless Communication ................................................................................ 17
WIRELESS COMMUNICATIONS OVERVIEW............................................................................................... 17
INSTALLING A WIRELESS MODULE .......................................................................................................... 17
OBTAINING THE APPLICATION (APP) ....................................................................................................... 17
USING THE APPLICATION ....................................................................................................................... 17
FCC COMPLIANCE ................................................................................................................................. 18
Maintenance .................................................................................................. 18
BATTERY INSTALLATION ......................................................................................................................... 19
FUSE REPLACEMENT ............................................................................................................................. 19
Specifications .................................................................................................. 20
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Introduction
Thank you for selecting the Extech Model MM750W Wireless Datalogging CAT IV True
RMS Multimeter. Proper use and care of this meter will provide many years of reliable
service. Please visit our website (www.extech.com) to check for the latest version of this
User Manual and Customer Support.
FEATURES
• True RMS responding Auto/Manual Range DMM
• 6000 count (3-3/4 digit) backlit LCD
• Measure AC/DC Voltage and Current, Frequency, Duty Cycle, Capacitance, Continuity,
Diode, and Temperature (Type-K thermocouple)
• Non-contact voltage detection
• Accepts external clamp adaptor input
• Data Hold
• MAXIMUM, MINIMUM, and MAX minus MIN recording
• Relative Zero mode
• Auto Power OFF (APO), can be temporarily disabled
• Wireless connectivity with Smart phones and Tablets
• Bluetooth® Wireless Datalogger Module (DAT12) stores over 15k readings for wireless
transmission using the ExView® W‐Series application
• Rated CAT IV 600V, CAT III 1000V
Safety
This symbol adjacent to another symbol, terminal or operating device indicates that the
operator must refer to an explanation in the Operating Instructions to avoid personal
injury or damage to the meter.
WARNING indicates that a potentially hazardous situation, which if not avoided,
could result in death or serious injury.
CAUTION indicates that a potentially hazardous situation, which if not avoided,
may result damage to the product.
This symbol advises the user that the terminal(s) so marked must not be
connected to a circuit point at which the voltage with respect to earth ground
exceeds (in this case) 1000 VAC or VDC.
This symbol adjacent to one or more terminals identifies them as being
associated with ranges that may, in normal use, be subjected to particularly
hazardous voltages. For maximum safety, the meter and its test leads should not
be handled when these terminals are energized.
This symbol indicates that a device is protected throughout by double insulation
or reinforced insulation.
WARNING
CAUTION
MAX
1000V
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PER IEC1010 OVERVOLTAGE INSTALLATION CATEGORY
OVERVOLTAGE CATEGORY I
Equipment of OVERVOLTAGE CATEGORY I is equipment for connection to circuits in which
measures are taken to limit the transient overvoltages to an appropriate low level.
Note – Examples include protected electronic circuits.
OVERVOLTAGE CATEGORY II
Equipment of OVERVOLTAGE CAT EGORY II is energy-consuming equipment to be supplied from
the fixed installation.
Note – Examples include household, office, and laboratory appliances.
OVERVOLTAGE CATEGORY III
Equipment of OVERVOLTAGE CATEGORY III is equipment in fixed installations.
Note – Examples include switches in the fixed installation and some equipment for industrial use
with permanent connection to the fixed installation.
OVERVOLTAGE CATEGORY IV
Equipment of OVERVOLTAGE CATEGORY IV is for use at the origin of the installation.
Note – Examples include electricity meters and primary over-current protection equipment
CAUTIONS
• Improper use of this meter can cause damage, shock, injury or death. Read and understand
this user manual before operating the meter.
• Always remove the test leads before replacing the battery or fuses.
• Inspect the condition of the test leads and the meter itself for any damage before operating
the meter.
• Use great care when making measurements if the voltages are greater than 25VAC rms or
35VDC. These voltages constitute a shock hazard.
• Warning! This is a class ‘A’ device. This equipment can cause residential radio signal
interference.
• Always discharge capacitors and remove power from the device under test before
performing Diode, Resistance or Continuity tests.
• Voltage checks on electrical outlets can be difficult and misleading because of the
uncertainty of the connection to the recessed electrical contacts. Use other means to
ensure that the terminals are not ‘live’.
• Do not operate this device in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired.
• Do not allow children or pets access to this device, its batteries and other accessories, or
the packaging materials.
• If this device is going to be unused for an extended period, remove the batteries.
• Expired or damaged batteries can cause cauterization on contact with the skin. Always use
suitable hand protection.
• Do not short-circuit the batteries and do not dispose of batteries in fire.
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We designed this device for safe use but please operate with caution. Follow the safety rules,
below, for safe operation.
1. NEVER apply voltage or current to the meter that exceeds the specified maximum:
Input Protection Limits
Function
Maximum Input
V DC or V AC
1000VDC / AC rms
uA AC/DC
600mA 1000V fast acting fuse
mA AC/DC
600mA 1000V fast acting fuse
A AC/DC
10A 1000V fast acting fuse (15 seconds max.;
always turn the meter OFF for 15 minutes between
10A measurement cycles)
Frequency/Duty Cycle, Resistance,
Diode Test, Capacitance, Continuity
1000V DC / AC rms
2. USE EXTREME CAUTION when working with high voltages.
3. DO NOT measure voltage if the voltage on the "COM" input jack exceeds 600V above earth
ground.
4. NEVER connect the meter leads across a voltage source while the function switch is in the
current, resistance, or diode position; doing so can damage the meter.
5. ALWAYS discharge filter capacitors in power supplies and disconnect the power when making
resistance or diode tests.
6. ALWAYS turn off the power and disconnect the test leads before opening the covers to replace
the fuse or batteries.
7. NEVER operate the meter unless the back cover and the battery and fuse covers are in place
and fastened securely.
8. Do not use the device immediately after moving it from a cold to a warm environment;
condensation may form and damage the meter. Leave the device switched off until it has
reached room temperature before use.
9. Do not use the meter immediately before, during, or after an electrical storm (thunder,
lightning, etc.).
10. If the equipment is used in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired.
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Meter Description
METER FRONT
1. Non-Contact Voltage Detector
2. LCD
3. Control buttons
4. Function switch
5. Positive 10A input terminal
6. COM negative input terminal
7. Positive terminal for all inputs except 10A
METER BACK
1. Wireless module compartment
2. Test lead holders
3. Battery compartment
4. 600mA/1000V Fuse compartment
5. Tilt stand
6. 10A/1000V Fuse compartment
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Control Buttons
Short press to enter Manual range and to select range manually
Long press to return to Auto range
Short presses step through Maximum/Minimum readings, and MAX
minus MIN; Long press to exit. Note that Auto Range is not
operational in MAX/MIN mode. Refer to the MAX/MIN section of
this manual for details
Short press for Relative mode ON/OFF
Long press for data transmission ON/OFF
Short press to select one of the functions available for a given rotary
switch position; Long press while powering up to defeat Auto Power
OFF (APO)
Short press for Data Hold ON/OFF
Long press backlight ON/OFF
Short press to step throughFrequency/Duty Cycle and to exit
Display Symbols
1. Automatic range
2. Diode test
3. Continuity test
4. Data hold
5. Relative zero
6. Maximum-Minimum mode
7. Temperature units
8. Non-contact voltage detector
9. Units of measure
10. Measurement display digits
11. Low battery icon
12. Minus sign
13. AC and DC symbols
14. Wireless Transmission
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