Klein Tools MM325 User manual

ENGLISH

600V

10A

Manual-Ranging

Digital Multimeter

INSTRUCTION MANUAL

• LEAD ALERT
PROTECTION

• DATA HOLD

• AUDIBLE
CONTINUITY

• BATTERY TEST

• DIODE TEST

• AUTO
POWER-OFF

Ω

2m

MM325

5000573

CAT III
600V

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GENERAL SPECIFICATIONS

Klein Tools MM325 is a manual-ranging multimeter that measures
AC/DC voltage, DC current, and resistance. It can also test batteries,
diodes, and continuity.

• Environment: Indoors. DO NOT expose to moisture, rain, or snow.

• Operating Altitude: 6562 ft. (2000m)

• Relative Humidity: <80% non-condensing

• Operating Temp: 32° to 104°F (0° to 40°C)

• Storage Temp: 14° to 140°F (-10° to 60°C)

• Accuracy: Values stated at 65° to 83°F (18° to 28°C)

• Temp Coef cient: 0.1 x (Quoted Accuracy) per °C above 28°C

or below 18°C, corrections are required when ambient working
temp is outside of Accuracy Temp range

• Dimensions: 6.41" × 3.13" × 1.83" (162.7 × 79.4 × 46.6 mm)

• Weight: 8.8 oz. (250 g)

• Calibration: Accurate for one year

• Standards: IEC EN 61010-1, 61010-2-030, 61010-2-033.

IEC EN 61326-1, 61326-2-2.

Conforms to UL STD.61010-1, 61010-2-030, 61010-2-033.

61010-2-033.

• Pollution degree: 2

• Accuracy: ± (% of reading + # of least significant digits)

• Drop Protection: 6.6 ft. (2m)

• Safety Rating: CAT III 600V, Class 2, Double insulation

Certified to CSA STD.C22.2 NO. 61010-1, 61010-2-030,

CAT III: Measurement category III is applicable to test and

measuring circuits connected to the distribution part of the
building’s low-voltage MAINS installation.

Specifications subject to change.

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ELECTRICAL SPECIFICATIONS

Function Range Resolution Accuracy

200.0mV 0.1mV

DC Voltage

(V DC)

AC Voltage

(V AC)

50 to 60Hz

DC Current

(A DC)

Resistance

Battery Test

20.00V 0.01V

200.0V 0.1V
600V 1V

200.0V

600V

200.0μA 0.1μA

200.0mA 100μA

10.00A 10mA ±(2.0% + 5 digits)

200.0Ω 0.1Ω

2000Ω 1Ω

20.00kΩ 0.01kΩ

200.0kΩ 0.1kΩ
2000kΩ 1kΩ ±(1.0% + 3 digits)

9V 10mV

1.5V 1mV

0.1V ±(1.0% + 3 digits)

1V ±(1.2% + 5 digits)

±(0.5% + 3 digits)2000mV 1mV

±(0.8% + 3 digits)

±(1.0% + 5 digits)20.00mA 10μA

±(0.8% + 3 digits)

±(1.0% + 2 digits)

• Diode Test: Approx. 1.0mA, open circuit voltage 2.0V DC

• Continuity Check: Audible signal <50Ω

• Battery Test: 9V (approx. 20mA, 450Ω load);

1.5V (approx. 15mA, 100Ω load)

• Sampling Frequency: 2 samples per second

• Overload: "OL" indicated on display, overload protection

600V RMS in all settings

• Polarity: "-" on display indicates negative polarity

• Display: 3 ½ digit, 2000 Count LCD

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WARNINGS

To ensure safe operation and service of the meter, follow these
instructions. Failure to observe these warnings can result in
severe injury or death.

• Before each use verify meter operation by measuring a known
voltage or current.

• Never use the meter on a circuit with voltages that exceed the
category based rating of this meter.

• Do not use the meter during electrical storms or in wet weather.

• Do not use the meter or test leads if they appear to be damaged.

• Use only with CAT III or CAT IV rated test leads.

• Probe assemblies to be used for MAINS measurements should
meet EN61010-031 standard, rated CATIII 600V, 10A or better.

• Ensure meter leads are fully seated, and keep fingers away
from the metal probe contacts when making measurements.

• Do not open the meter to replace batteries while the probes
are connected.

• Use caution when working with voltages above 25V AC RMS
or 60V DC. Such voltages pose a shock hazard.

• To avoid false readings that can lead to electrical shock,
replace batteries when a low battery indicator appears.

• Do not attempt to measure resistance or continuity on a live
circuit.

• Always adhere to local and national safety codes. Use personal
protective equipment to prevent shock and arc blast injury
where hazardous live conductors are exposed.

SYMBOLS ON METER

Alternating Current

AC

Resistance (in Ohms) Ground
Diode Audible Continuity
Fuse (with rating below symbol) Double Insulated Class II
Backlight Read Instructions
Warning or Caution:

meter, follow all warnings and instructions detailed in this manual.

Risk of Electrical Shock:

of electrical shock. Follow all warnings and instructions detailed in
this manual.

To ensure safe operation and service of this

Improper use of this meter can lead to risk

DC

Direct Current

SYMBOLS ON LCD

Data Hold Audible Continuity

H

Diode Low Battery
Hazardous Voltage Auto Power-Off

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FEATURE DETAILS

1

6

2

3 54

8

NOTE: There are no user-serviceable parts inside meter.

2000 count LCD display

1.

Function selector switch

2.

"10A" jack

3.

"COM" jack

4.

"VΩ" jack

5.

"HOLD" (Data Hold) button

6.

Backlight button

7.

Lead Alert LEDs

8.

7

5

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FUNCTION BUTTONS

ON/OFF
Power-ON: Rotate the Function Selector switch2 from the OFF

setting to any measurement setting.

Power-OFF: Rotate the Function Selector switch2 to the OFF setting.
Auto Power-OFF: By default, the meter will automatically Power-

OFF after 15 minutes of inactivity. Reactivate meter by pressing any
button. To deactivate the automatic Power OFF feature, power the
meter ON with the "HOLD" button6 depressed. When automatic
Power OFF is deactivated, the Auto Power-OFF symbol will not
be visible in the display.

HOLD (DATA HOLD)

Press the "HOLD" button
Press again to release the display and return to live measuring.

BACKLIGHT

Press and hold the Backlight button
to turn the backlight on or off. Backlight automatically turns off
after approximately 3 minutes.

LEAD ALERT LEDs

When the Function Selector switch
setting, the Lead Alert LEDs
the test leads are inserted into the appropriate jacks. The lights will
automatically turn off after 2 minutes. To disable the Lead Alert LEDs

, power the meter ON while holding the Backlight button7.

8

to hold the measurement on the display.

6

for more than one second

7

is rotated to a measurement

2

will illuminate green to ensure that

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NOTE: Lead Alert function will reactivate by default when the meter

powers OFF or when the Function Selector switch is rotated.

OPERATING INSTRUCTIONS

CONNECTING TEST LEADS

Do not test if leads are improperly seated. Results could cause
intermittent display readings. To ensure proper connection, firmly
press leads into the input jack completely.

INCORRECT

CORRECT

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OPERATING INSTRUCTIONS

5/32

(4 mm)

TESTING IN CAT III / CAT IV MEASUREMENT LOCATIONS

Ensure the test lead shield is pressed firmly in place. Failure to use
the CAT III / CAT IV shield increases arc-flash risk.

5/32"

(4 mm)

TESTING IN CAT II MEASUREMENT LOCATIONS

CAT III / CAT IV shields may be removed for CAT II locations. This
will allow testing on recessed conductors such as standard wall
outlets. Take care not to lose the shields.

0.7" (18 mm)

AC VOLTAGE (LESS THAN 600V)

1. Insert RED test lead into VΩ jack
COM jack

highest V AC (

, and rotate Function Selector Switch 2 to the

4

) setting (600V).

, and BLACK test lead into

5

2. Measure voltage and rotate the Function Selector Switch

to successively lower V AC (

) settings to obtain higher

resolution measurements.

NOTE: The hazardous voltage indicator will appear for voltages >30V.
NOTE: Do not attempt to measure more than 600V or 200mA.

Red leadBlack lead

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DC VOLTAGE (LESS THAN 600V)

1. Insert RED test lead into VΩ jack
COM jack

highest V DC (

, and rotate Function Selector Switch 2 to the

4

) setting (600V).

, and BLACK test lead into

5

2. Measure voltage and rotate the Function Selector Switch
to successively lower V DC (

) settings to obtain higher

resolution measurements.

NOTE: When in a voltage setting and the test leads are open,
readings of order mV may appear on the display. This is noise and
is normal. By touching the test leads together to close the circuit
the meter will measure zero volts.

NOTE: The hazardous voltage indicator will appear for voltages >30V.
NOTE: Do not attempt to measure more than 600V or 200mA.

Red leadBlack lead

DC CURRENT 200mA to 10A

1. For DC currents more than 200mA and less than 10A, insert

RED test lead into 10A jack

jack

, and rotate Function Selector Switch 2 to the

4

, and BLACK test lead into COM

3

10A DC setting.

Red lead Black lead

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OPERATING INSTRUCTIONS

DC CURRENT LESS THAN 200mA

1. For mA DC currents less than 200mA, insert RED test lead into VΩ
jack 5, and BLACK test lead into COM jack 4, and rotate Function

Selector Switch 2 to the highest mA DC setting (200mA).

Red leadBlack lead

2. To measure current: Remove power from circuit, open circuit at

measurement point, connect meter in-series in the circuit using
the test leads, and apply power to circuit.

NOTE: If measuring mA, the Function Selector Switch 2 may
be rotated to successively lower mA DC settings to obtain higher
resolution measurements.

Do not attempt to measure more than 10A.

When measuring currents greater than 6A, a measurement
time of 30 seconds followed by 10 minutes of recovery time
is recommended.

RESISTANCE MEASUREMENTS

1. Insert RED test lead into VΩ jack 5, and BLACK test lead into

COM jack 4,
highest Ω setting (2MΩ).

2. Remove power from circuit.

3. Measure resistance by connecting test leads to circuit and

rotating the Function Selector Switch 2to successively
lower Ω settings to obtain higher resolution measurements.

and rotate Function Selector Switch 2 to the

Red leadBlack lead

NOTE: When in a Resistance setting and the test leads are open
(not connected across a resistor), or when a failed resistor is under
test, the display will indicate O.L. This is normal.

DO NOT attempt to measure resistance on a live circuit.

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OPERATING INSTRUCTIONS

CONTINUITY

1. Insert RED test lead into VΩ jack 5 and BLACK test lead into COM

, and rotate Function Selector Switch 2 to the setting.

jack

4

2. Remove power from circuit.

3. Test for continuity by connecting conductor or circuit with test

leads. If resistance is measured less than 100Ω, an audible
signal will sound and display will show a resistance value
indicating continuity. If circuit is
open, display will show "OL".

Red leadBlack lead

DO NOT attempt to measure continuity on a live circuit.

DIODE TEST

1. Insert RED test lead into VΩ jack 5 and BLACK test lead into COM

, and rotate Function Selector Switch 2 to the setting.

jack

4

2. Touch test leads to diode. A reading of 200-700mV on display

indicates forward bias, OL indicates reverse bias. An open
device will show OL in both
polarities. A shorted device
will show approximately 0mV.

Red leadBlack lead

BATTERY TEST

1. Insert RED test lead into VΩ jack

COM jack
or 9V battery test setting.

, and rotate Function Selector Switch 2to the 1.5V

4

and BLACK test lead into

5

2. Connect BLACK lead to negative, and RED lead to positive

terminal of battery.

3. Measure voltage on display,

batteries in good condition
should be within approx. 10%
of rated voltage.

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Red leadBlack lead

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MAINTENANCE

BATTERY REPLACEMENT

When the indicator is displayed, the batteries must be replaced.

1. Remove screw from battery door.

2. Replace 2 x AAA batteries (note proper polarity).

3. Replace battery door and fasten securely with screw.

T

o avoid risk of electric shock, disconnect leads from any

voltage source before removing battery door.

To avoid risk of electric shock, do not operate meter while
battery door is removed.

FUSE REPLACEMENT

A fuse may blow if more than 200mA is applied to the
or more than 10A is applied to the 10A jack

1. Remove screw from battery door.

2. Replace blown fuse(s) with:

VΩ (μA/mA) jack5: 200mA/600V fast-blow, interrupting rating 1kA

(Klein Cat. No. 69031)

10A jack3: 10A/600V fast-blow, interrupting rating 10kA

(Klein Cat. No. 69032)

3. Replace battery door and fasten securely with screw.

VΩ

jack 5,

. To access fuses:

3

To avoid risk of electric shock, disconnect leads from any
voltage source before accessing fuses.

To avoid risk of electric shock, do not operate meter while
back housing is removed.

2× AAA batteries

200mA/600V fast-blow fuse

(Klein Cat No. 69031)

10A/600V fast-blow fuse

(Klein Cat. No. 69032)

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CLEANING

Be sure meter is turned off and wipe with a clean, dry lint-free
cloth.

Do not use abrasive cleaners or solvents.

STORAGE

Remove the batteries when meter is not in use for a prolonged
period of time. Do not expose to high temperatures or
humidity. After a period of storage in extreme conditions
exceeding the limits mentioned in the General Specifications
section, allow the meter to return to normal operating
conditions before using.

FCC & IC COMPLIANCE

for FCC compliance information.

Canada ICES-003 (B) / NMB-003 (B)

WARRANTY

DISPOSAL / RECYCLE

Do not place equipment and its accessories in the trash.
Items must be properly disposed of in accordance with local
regulations. Please see www.epa.gov/recycle for additional
information.

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