MM325 - Multimeter Klein Tools - Free user manual and instructions

Product Type	Manual Range Digital Multimeter
Brand	Klein Tools
Model	MM325
Dimensions	162.7 × 79.4 × 46.6 mm (6.41 × 3.13 × 1.83 in)
Weight	250 g (8.8 oz)
Power Supply	2 AAA batteries
Display	3 1/2 digit digital LCD, 2000 counts
Sampling Frequency	2 samples per second
Measurement Functions	AC/DC voltage, DC current, resistance, battery test, diode test, continuity
DC Voltage Range	200.0 mV to 600 V
AC Voltage Range	200.0 V to 600 V (50-60 Hz)
DC Current Range	200.0 μA to 10 A
Resistance Range	200.0 Ω to 2 MΩ
Basic Accuracy	±(0.5% to 2.0% + digits) depending on function
Special Features	Data hold (HOLD), backlight, auto-off (15 min), audible continuity indicator, test lead alert LED
Safety	CAT III 600 V, double insulation, 2 m drop protection
Fuses	200 mA/600 V (cat. 69031) and 10 A/600 V (cat. 69032), fast-acting
Operating Temperature	0 °C to 40 °C
Storage Temperature	-10 °C to 60 °C
Relative Humidity	< 80% non-condensing
Operating Altitude	Up to 2000 m
Cleaning	Lint-free cloth, no solvents or abrasives
Warranty	See www.kleintools.com/warranty

Frequently Asked Questions - MM325 Klein Tools

How to measure AC voltage with the MM325?

Insert the red lead into the VΩ jack and the black into COM. Turn the selector to AC V (V~) and start with the highest range (600 V). Measure by connecting the probes to the circuit. The hazardous voltage indicator displays for >30 V.

How to replace the multimeter batteries?

First disconnect the test leads. Remove the screw of the battery compartment on the back. Replace the 2 AAA batteries observing polarity. Replace the cover and tighten the screw.

What to do if the screen displays 'OL'?

'OL' means overload or open circuit. In resistance mode, if the leads are not contacting or the resistance is too high, 'OL' displays. In voltage mode, 'OL' indicates a voltage higher than the selected range.

How to disable auto power off?

Turn on the multimeter while holding the HOLD button. The auto power off symbol disappears from the display. Auto power off is reactivated after a power cycle.

Which fuses to use for the MM325?

For the VΩ (μA/mA) jack: fast-acting fuse of 200 mA/600 V (ref. 69031). For the 10A jack: fast-acting fuse of 10 A/600 V (ref. 69032).

How to test a diode with this multimeter?

Select the diode mode. Insert the red lead into VΩ and the black into COM. Touch the diode with the probes. A reading of 200-700 mV indicates forward bias; 'OL' for reverse. A short circuit shows ~0 mV.

Is the multimeter suitable for measuring on CAT III circuits?

Yes, the MM325 is CAT III 600 V certified. Use the protective screens on the probes for CAT III/IV measurements. For CAT II, the screens can be removed.

How to use the data hold (HOLD) function?

Press the HOLD button to freeze the displayed reading. Press again to release and resume real-time measurements.

What does the test lead alert LED mean?

The green LED lights when you turn the selector to remind you to check the leads are properly connected. It turns off after 2 minutes. To permanently disable it, hold the backlight button when turning on the meter.

How to measure DC current >200 mA?

Insert the red lead into the 10A jack and the black into COM. Select the 10A DC range. Connect the multimeter in series with the circuit. For currents >6A, limit measurement to 30 minutes followed by 10 minutes of rest.

USER MANUAL MM325 Klein Tools

Grid of 12 black square icons representing electronic components and indicators including voltage, ammeter, resistor, test, lightbulb, battery, and LCD display.

ESPAÑOL pág. 13

FRANÇAIS p. 25

KLEIN® TOOLS

KLEIN TOOLS AC DC H 18.88 BATT μmVA MkΩ -+ -+0 HOLD 600 OFF 600 V- 200 20 2 200 m 9V BATT 1.5V 200μ 20m 200m 10 A 2M Ω MM325 Original Multi-Master 10A COM +VD - μAmA 10A A-16S 200mA AMOS CAT Ⅲ MAX 10A

CE UK CA

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^ (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 Coefficient: 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.
  Certified to CSA STD.C22.2 NO. 61010-1, 61010-2-030, 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

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.

ELECTRICAL SPECIFICATIONS

Function Range Resolution Accuracy
DC Voltage (V DC)	200.0mV 0.1mV		±(0.5% + 3 digits)2000r
	20.00V 0.01V
	200.0V 0.1V		±(0.8% + 3 digits)
	600V 1V
AC Voltage (V AC) 50 to 60Hz	200.0V	0.1V ±(1.0% + 3 digits)
	600V	1V ±(1.2% + 5 digits)
DC Current (A DC)	200.0μA 0.1μA		±(1.0% + 5 digits)20.00
	200.0mA 100μA
	10.00A 10mA ±(2.0% + 5 digits)
Resistance	200.0Ω 0.1Ω		±(0.8% + 3 digits)
	2000Ω 1Ω
	20.00kΩ 0.01kΩ
	200.0kΩ 0.1kΩ
	2000kΩ 1kΩ ±(1.0% + 3 digits)
Battery Test	9V 10mV		±(1.0% + 2 digits)
	1.5V	1mV

• 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

⚠️ 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

AC Alternating Current DC Direct Current

Ω Resistance (in Ohms) Ground

Diode Audible Continuity

Fuse (with rating below symbol) Double Insulated Class II

Backlight Read Instructions i

Warning or Caution: To ensure safe operation and service of this meter, follow all warnings and instructions detailed in this manual.

Risk of Electrical Shock: Improper use of this meter can lead to risk of electrical shock. Follow all warnings and instructions detailed in this manual.

SYMBOLS ON LCD

Data Hold Audible Continuity Diode Low Battery Hazardous Voltage Auto Power-Off

FEATURE DETAILS

KLEIN TOOLS 18.8.8 AC DC H BATT μmVA MkΩ HOLD 600 OFF 600 V~ 200 200 2 200 9V BATT 1.5V 200μ 20m 200m 10 A= MM325 Digital Multi-Meter +VD μAmA COM 10A 3 4 5 3 4 8

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

1. 2000 count LCD display
2. Function selector switch
3. "10A" jack
4. "COM" jack
5. "VΩ" jack
6. "HOLD" (Data Hold) button
7. Backlight button
8. Lead Alert LEDs

FUNCTION BUTTONS

ON/OFF

Power-ON: Rotate the Function Selector switch ② from the OFF setting to any measurement setting.

Power-OFF: Rotate the Function Selector switch ② 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" button 6 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 ⑥ to hold the measurement on the display. Press again to release the display and return to live measuring.

BACKLIGHT

Press and hold the Backlight button ⑦ for more than one second to turn the backlight on or off. Backlight automatically turns off after approximately 3 minutes.

LEAD ALERT LEDs

When the Function Selector switch ② is rotated to a measurement setting, the Lead Alert LEDs ⑧ will illuminate green to ensure that the test leads are inserted into the appropriate jacks. The lights will automatically turn off after 2 minutes. To disable the Lead Alert LEDs ⑧, power the meter ON while holding the Backlight button ⑦.

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

OPERATING INSTRUCTIONS

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) CAT IV 800V CAT III 1000V 10A

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.

CAT IV 800V CAT III 1000V 0.7" (18 mm)

AC VOLTAGE (LESS THAN 600V)

1. 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 V AC (V\~) setting (600V).
2. Measure voltage and rotate the Function Selector Switch to successively lower V AC (V\~) 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.

MM325 10A Diode: Black leader +V0 → μA mA⁻¹ COM Red leadBlack lead

600 OFF 600 V- 299 200 20 4+ 2 2k 200 m 9V 200k BATT 200k 1.5V 3M 200μ 20m 200m 10 Amm

DC VOLTAGE (LESS THAN 600V)

1. 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 V DC (V⋯) setting (600V).
2. Measure voltage and rotate the Function Selector Switch to successively lower V DC (V---) 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.

MM125 Digital Multimeter 10A COM +V0 → μA mA Red lead Black lead

600 OFF 600 200 20 2 200 m 9V 8A1F 1.5V 200μ 20m 200m 10 A- 2M Ω

DC CURRENT 200mA to 10A

1. For DC currents more than 200mA and less than 10A, insert RED test lead into 10A jack ③, and BLACK test lead into COM jack ④, and rotate Function Selector Switch ② to the 10A DC setting.

MM325 Display Mode Meter 10A COM +V0 ← -0 μA.mA Red lead Black lead

600 OFF 600 280 200 200m 2k 9V 20K BATY 200K 1.5V 2M 200V 20m 200m 10 A-

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).

MM325 Digital Multi-Water 10A COM +VDD μA.mA 10A COM 10A 10A 10A 10A

Red leadBlack lead

600 OFF 600 V- 299 200 20 2k 2 20k 200m 9V 200k BATT 1.5V 2M 200μ 20m 200m 10 A-

1. 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, and rotate Function Selector Switch 2 to the highest Ω setting (2MΩ).
2. Remove power from circuit.
3. Measure resistance by connecting test leads to circuit and rotating the Function Selector Switch 2 to successively lower settings to obtain higher resolution measurements.

MM325 Engine Multi-pressor 10A COM +VΩ → μA mA⁻¹ ΔΩ ΔΩ ΔΩ CAT B control

Red leadBlack lead

600 OFF 600 V~ 200 200 2k 200 200k 2M Ω V~ 200 20 200m 200m 10 RATI 1.5V 200μ A

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.

OPERATING INSTRUCTIONS

CONTINUITY

1. Insert RED test lead into VΩ jack 5 and BLACK test lead into COM jack 4, and rotate Function Selector Switch 2 to the -setting.

2. Remove power from circuit.

3. Test for continuity by connecting conductor or circuit with test leads. If resistance is measured less than 100 , an audible signal will sound and display will show a resistance value

indicating continuity. If circuit is open, display will show "OL".

MM325 Digital Multi-Mechan 10A COM +V μA.mA CAT 8 MOS: MDD

Red leadBlack lead

600 OFF 600 V- 200 200 200 2k 20k 200k 200k Ω 1.5V 200μ 20m 260m 10 A-

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 jack ④, and rotate Function Selector Switch ② to the -setting.

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.

MM325 Digital Multi-Motor 10A COM +VΩ → μA mA⁻¹

Red leadBlack lead

600 OFF 600 V~ 200 200 2 200 m 9V RATTY 1.5V 200M 200m 10 A~ 2k 20k 200k 2M

BATTERY TEST

1. Insert RED test lead into VΩ jack ⑤ and BLACK test lead into COM jack ④, and rotate Function Selector Switch ② to the 1.5V or 9V battery test setting.

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.

MM325 Digital Multi-Accrer 10A COM +VD → μA mA⁻¹ ΔV ΔV ΔV ΔV ΔV

600 OFF 600 V~ 200 200 20 2k 2 200 m 200k 9V 200k BAT1 1.5V 2M 300V 20m 200m 10 A~

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.

⚠️ To 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 VΩ jack ⑤, or more than 10A is applied to the 10A jack ③. To access fuses:

1. Remove screw from battery door.
2. Replace blown fuse(s) with:

VΩ (μA/mA) jack ⑤: 200mA/600V fast-blow, interrupting rating 1kA (Klein Cat. No. 69031)

10A jack ③: 10A/600V fast-blow, interrupting rating 10kA (Klein Cat. No. 69032)

1. Replace battery door and fasten securely with screw.

⚠️ 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)

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

See this product's page at www.kleintools.com

for FCC compliance information.

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

WARRANTY

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.

CUSTOMER SERVICE

KLEIN TOOLS, INC.

450 Bond Street

Lincolnshire, IL 60069

1-800-553-4676

[e-mail]

www.kleintools.com

Grid of 12 black square icons representing electronic components and indicators including voltage, ammeter, resistor, test, lightbulb, battery, and LCD display.

KLEIN TOOLS AC DC H BATT μmVA MkΩ HOLD 600 OFF 600 V 200 200 2k 200 200k 200μ 20m 200m 10 2M MM325 Digital Multi-Meter +VD++ μAmA 10A COM 10A MAX EXT B MIN 10A

CE UK CA

Intertek

5000573

KLEIN® TOOLS

CAT III

600 V

BOTÓN "HOLD" (RETENER)

Grid of 12 black square icons with standard electronic symbols and labels including V, A, Ω, mV, mA, μA, HOLD, TEST, lightbulb, LED, APO, and a battery symbol.

KLEIN TOOLS AC DC H BATT μm VA Mk Ω HOLD 600 OFF 600 V~ 200 200 20 2k 200 20k 200μ 200k 1.5V 2M 200μ 200m 10 A= MM325 Digital Multi-Meter +VD++ μAmA 10A COM 10A MAX OUT B MAX

CE UK CA

Intertek

5000573

KLEIN® TOOLS

CAT III

600 V

CARACTÉRISTIQUES GÉNÉRALES

BOUTON HOLD (MAINTIEN DES DONNÉES)

REPLACEMENT DES PILES