Extech Instruments MA3110 User manual

USER MANUAL
3000A TRUE RMS AC Flexible Clamp Meter
Model MA3110
Additional User Manual Translations available at www.extech.com

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Introduction
Thank you for choosing the Extech Model MA3110 Flexible AC Clamp meter with automatic
ranging, data hold, and auto power OFF. The MA3110 is a professional CAT III 1000V instrument
that measures up to 3000A AC RMS. The MA3110 also measures DC and AC Voltage, Resistance,
Capacitance, Diode, and Continuity (beeper). This device is shipped fully tested and calibrated
and, with proper use, will provide years of reliable service. Please visit our website
(www.extech.com) to check for the latest version of this User Guide, Product Updates, Product
Registration, and Customer Support.
Features
600A and 3000A AC True RMS Current Measurement ranges
AC (True RMS) and DC Voltage Measurements
Automatic ranging
Meets IEC61010-1, 3rd Edition (2010) CAT III 1000V Safety requirements.
Resistance, Capacitance, Diode, and Continuity Beeper
Data Hold feature freezes displayed reading
6000 count large scale LCD display
Convenient Flexible Clamp with locking mechanism
8mm (0.3”) coil diameter for measuring in tight spaces
Coil length 300mm (11.8“)
Auto Power OFF after 15 minutes of inactivity
Overload Protection for most ranges
Durable, long-lasting components, enclosed in strong, lightweight ABS-plastic housing.

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Safety Information
To ensure the safe operation and service of the meter, follow these instructions closely. Failure to
observe warnings can result in severe injury.
Precautions and Preparations for Measurements
Ensure that the batteries are connected in the correct polarity and placed in the battery
compartment (rear) correctly.
Place the red and black test leads into the proper input terminals before making
measurements.
Remove the test leads from the circuit under test when changing the measurement ranges.
Do not exceed the maximum rated voltage and current on the meter input terminals.
Remove the battery if the meter is to be stored for long periods
Replace the test leads only with ones rated for CAT III 1000V or better.
The meter has an automatic power OFF (APO) utility that switches the meter OFF after 15
minutes of inactivity. Press any key to wake the meter. To disable this feature, press and
hold the M (mode) button while switching the meter ON.
Warnings
Warnings identify hazardous conditions and actions that could cause BODILY HARM or DEATH.
Individual protective equipment should be used if HAZARDOUS LIVE parts in the installation
where measurements are to be carried out could be accessible.
If the equipment is used in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired.
To reduce the risk of fire or electric shock, do not expose this product to rain or moisture.
Verify the meter operation by measuring a known current. If in doubt, have the meter
serviced.
Do not apply more than the rated voltage/current as marked on the meter.
To avoid false readings that can lead to electric shock and injury, replace battery as soon as
the low battery indicator appears.
Do not use the meter in or around explosive gas or vapor.
Do not use a flexible current sensor if the inner copper wire of the flexible cord is visible.
De-energize the installation under test or wear suitable protective clothing when placing or
removing the flexible current probe from a test setup.
Do not apply/remove the flexible current probe to/from UNINSULATED HAZARDOUS LIVE
conductors that may cause electric shock, electric burn, or arc flash.

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CAUTIONS
CAUTIONS identify conditions and actions that could cause DAMAGE to the meter or equipment
under test. Do not expose the meter to extremes in temperature or high humidity.
Safety Symbols that are typically marked on meters and instructions
Caution: Do not apply voltage or current to the input terminals or clamp that
exceeds the specified ranges
Caution: Risk of electric shock!
Equipment protected by double or reinforced insulation
Conforms to EU directives
Do not discard this product in household trash.
AC measurement
Earth ground
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 over-voltages to an appropriate low level.
Note –Examples include protected electronic circuits.
OVERVOLTAGE CATEGORY II
Equipment of OVERVOLTAGE CATEGORY 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.

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Description
Meter Description
1. Flexible Current Clamp
2. Clamp Lock Mechanism
3. 6000-count LCD Display
4. Power button
5. Data Hold Button
6. MODE (M) Button
7. Function Switch
8. COM (-) test lead input terminal
9. Positive (+) test lead terminal
Display Icons
H Data Hold
AUTO Automatic Range mode
AC Alternating Current
DC Direct Current
Low battery icon (flashing when measurements cannot be expected to be in-
specification)
Continuity alert (beeper)
V Unit for Voltage measurements
A Unit for Current measurements
Ω, KΩ, MΩUnits for Resistance measurements
nF, uF Units for Capacitance measurements
Diode measurements
OL ‘Overload’ for over range measurements (voltage, current and resistance)
- Minus symbol (negative) when the measurement value is negative

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Operation
NOTES: Read and understand all Warning and Caution statements in this operation manual
prior to using this meter.
Meter Power
The meter is powered by two (2) 1.5V ‘AAA’ batteries. The battery compartment is located on the
back of the meter. Press the Power button to switch the device ON or OFF.
Low battery indication
When the low battery icon appears ( ) the batteries should be replaced immediately,
although in-specification measurements can still be made temporarily. When the low battery
icon begins blinking, in-specification measurements are no longer supported and batteries must
be replaced before further measurements can be made. Refer to the battery replacement
procedure in the maintenance section.
Automatic Power OFF
The meter switches OFF automatically after a 15-minute period of inactivity. To disable the Auto
Power OFF feature:
With the meter power OFF, press and hold the Mode (M) button while powering the
meter ON.
The APO feature is now disabled and the meter will not shut off automatically.
Note that the next time the meter is powered up, the Auto Power OFF function will be
enabled again and the user will have to repeat the Auto Power OFF disable instructions
to disable this function when desired.
Data Hold
Press the H(HOLD) button with the meter ON to freeze the displayed reading. The Hicon will
appear along with the held reading. Press the H(HOLD) button again to release the HOLD feature.
The Hicon will switch OFF and the meter will show real time readings.

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DC and AC Voltage Measurements
WARNING: Use the test lead probe covers for CAT IV 600V installations. Do not measure
voltages greater than 1000V.
CAUTION: When connecting the test leads to the circuit or device under test, connect the
black lead before the red; when removing the test leads, remove the red before the black lead.
1. Connect the black test lead into the COM terminal.
2. Connect the red test lead into the ‘V’ terminal.
3. Power the meter using the power button .
4. Put the function switch to the ‘V’ position.
5. The display will show the ‘AUTO’ icon (Auto Range mode).
6. Press the M (MODE) button to select AC or DC voltage.
7. Press the test leads across the circuit under test and read the voltage on the display.
8. In the Auto Range mode, the meter will automatically select the optimal range. AC voltage
measurements are True RMS readings.

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AC Current Measurements
WARNING: Ensure that power to the device under test is OFF before starting this
procedure. Switch power to the device under test ON only after the clamp has been safely
attached to the device under test.
CAUTION: Do not move fingers above the LCD at any time during a test.
1. Switch the meter OFF and switch OFF power to the device under test.
2. Switch the meter ON and select ‘A’ with the function switch. The display will show the
automatic range icon (AUTO).
3. Turn the knurled clamp lock mechanism counter-
clockwise to release the flexible clamp.
4. Fully enclose only one conductor of the device under
test with the flexible clamp probe (see accompanying
diagrams). Do not attempt to measure current higher
than the specified current limit.
5. Re-lock the clamp turning the clamp lock clockwise.
6. Switch power to the device under test ON. Never move fingers above the LCD when
running a test.
7. Read the current value in the display. The meter will automatically select the appropriate
range (600.0A and 3000A).

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Resistance Measurements
CAUTION: Disconnect power to the circuit or device under test when making resistance
measurements
1. Connect the black test lead into the COM terminal.
2. Connect the red test lead into the ‘Ω’ terminal.
3. Power the meter using the power button .
4. Put the function switch to the ‘Ω’ position.
5. The display will show the ‘AUTO’ icon (Auto Range mode).
6. Press the M (Mode) button to select resistance Ω mode.
7. Press the test leads across the circuit under test and read the resistance on the display.
8. In the Auto Range mode, the meter will automatically select the optimal range.

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Continuity Measurements
CAUTION: Disconnect power to the circuit or device under test when making continuity
measurements
1. Connect the black test lead into the COM terminal.
2. Connect the red test lead into the ‘ohms’ terminal.
3. Power the meter using the power button .
4. Put the function switch to the ‘ohms’ position.
5. The display will show the ‘AUTO’ icon (Auto Range mode).
6. Press the M (Mode) button to select continuity mode.
7. The display will show “MANU” icon (Manual Range mode).
8. Press the test leads across the circuit under test. The meter will beep and the display will
show the continuity symbol when the resistance is < 20 ohms.