Klein Tools MM300 Digital Multimeter Instruction Manual
- June 1, 2024
- KLEIN TOOLS
Table of Contents
Klein Tools MM300 Digital Multimeter
GENERAL SPECIFICATIONS
Klein Tools MM300 is a manual ranging multimeter that measures AC/DC voltage, DC current, and resistance. It can also test batteries, diodes, and continuity.
- Operating Altitude: 6562 ft. (2000m)
- Relative Humidity: <80% non-condensing
- Operating Temp: 32°F to 104°F (0°F to 40°C)
- Storage Temp: 14°C to 140°F (-10°C 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 the ambient working temp is outside of the Accuracy Temp range
- Dimensions: 6.04″ x 3.07″ x 1.78″ (153.4 x 78.0 x 45.2 mm)
- Weight: 8.1 oz. (230 g)
- Calibration: Accurate for one year
- Standards:
- Conforms to: UL STD 61010-1, 61010-2-030, 61010-2-033.
- Certified to: CSA STD C22.2 # 61010-1, 61010-2-030, 61010-2-033.
- IEC EN 61010-1, 61010-2-030, 61010-2-033, 61326-1.
- Pollution degree: 2
- Accuracy: ± (% of reading + # of least significant digits)
- Drop Protection: 3.3 ft. (1m)
- 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.
- Electromagnetic Environment: IEC EN 61326-1. This equipment meets requirements for use in basic and controlled electromagnetic environments like residential properties, business premises, and light-industrial locations.
Specifications subject to change.
ELECTRICAL SPECIFICATIONS
| Function | Range | Resolution | Accuracy |
|---|
DC Voltage (V DC)
| 200.0mV| 0.1mV| ****
±(0.5% + 3 digits)
2000mV| 1mV
20.00V| 0.01V
200.0V| 0.1V| ±(0.8% + 3 digits)
600V| 1V
AC Voltage (V AC)| 200.0V| 0.1V| ±(1.2% + 10 digits)
50 to 60Hz
600V| 1V
DC Current (A DC)
| 200.0µA| 0.1µA| ±(1.0% + 5 digits)
20.00mA| 10µA
200.0mA| 100µA| ±(1.2% + 5 digits)
10.00A| 10mA| ±(3.0% + 5 digits)
Resistance
| 200.0O| 0.1O| ****
±(1.0% + 5 digits)
2000O| 1O
20.00kO| 0.01kO
200.0kO| 0.1kO
2000kO| 1kO| ±(1.5% + 5 digits)
Battery Test| 9V| 10mV| ±(1.0% + 2 digits)
1.5V| 10mV| ±(1.0% + 2 digits)
- Diode Test: Approx. 1mA, open circuit voltage 2.0V DC
- Continuity Check: Audible signal <100Ω
- Battery Test: 9V (6mA); 1.5V (100mA)
- 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.
- 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
-
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 the risk of electrical shock. Follow all warnings and instructions detailed in this manual.
SYMBOLS ON LCD
FEATURE DETAILS
NOTE: There are no user-serviceable parts inside meter.
- 2000 count LCD display
- Function selector switch
- “10A” jack
- “COM” jack
- “VΩ” jack
- “HOLD” (Data Hold) button
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.
-
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.
-
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.
AC VOLTAGE (LESS THAN 600V)
- 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 ( ) setting (600V).
- Measure voltage and rotate the function selector switch to successively lower V AC ( ) settings to obtain higher resolution measurements.
NOTE: Do not attempt to measure more than 600V or 200mA.
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 ( ) setting
(600V).
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: Do not attempt to measure more than 600V or 200mA.
DC CURRENT 200mA to 10A
-
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.
DC
CURRENT LESS THAN 200mA -
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).
-
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.The meter will autorange to display the measurement in the most appropriate range.
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
- Insert RED test lead into V jack 5 , and BLACK test lead into COM jack 4 , and rotate function selector switch 2 to the highest setting (2M ).
- Remove power from circuit.
- Measure resistance by connecting test leads to circuit and rotating the function selector switch 2 to successively lower settings to obtain higher resolution measurements.
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.
CONTINUITY
- Insert RED test lead into V jack 5 and BLACK test lead into COM jack 4 , and rotate function selector switch 2 to the setting.
- Remove power from circuit.
- 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”.
DO NOT attempt to measure continuity on a live circuit.
DIODE TEST
- Insert RED test lead into V jack 5 and BLACK test lead into COM jack 4 , and rotate function selector switch 2 to the setting.
- 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.
BATTERY TEST
- Insert RED test lead into V 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.
- Connect BLACK lead to negative, and RED lead to positive terminal of battery.
- Measure voltage on display, batteries in good condition should be within approx. 10% of rated voltage.
DATA HOLD
- Press Data Hold button 6 to hold the measurement on the display.
- Press again to release the display and return to live measuring.
BATTERY REPLACEMENT
When indicator is displayed on LCD, batteries must be replaced.
- Remove screw from battery door.
- Replace 2 x AAA batteries (note proper polarity).
- 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 V jack 5 , or more than
10A is applied to the 10A jack 3 . To access fuses:
- Remove 6 screws from back of meter and remove back housing.
- Replace blown fuse(s) with: V ( A/mA) jack 5 : 200mA/600V fast-blow (Klein Cat. No. 69031) 10A jack 3 : 10A/600V fast-blow (Klein Cat. No. 69032)
- Replace back housing and fasten securely with screws.
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.
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 or www.erecycle.org for additional information.
CUSTOMER SERVICE
KLEIN TOOLS, INC. 450 Bond Street Lincolnshire, IL 60069
FREQUENTLY ASKED QUESTIONS
What are the key features of the Klein Tools MM300 Digital Multimeter?
The Klein Tools MM300 Digital Multimeter boasts features such as voltage, current, and resistance measurements, along with continuity and diode testing capabilities.
What type of power source does the Klein Tools MM300 Digital Multimeter use?
The Klein Tools MM300 Digital Multimeter is powered by 4 AAAA batteries, providing portable and convenient operation.
What are the dimensions and weight of the Klein Tools MM300 Digital Multimeter?
The Klein Tools MM300 Digital Multimeter measures 3.5 x 0.9 x 6 inches and weighs approximately 15.1 ounces, ensuring easy handling and storage.
What is the item model number of the Klein Tools MM300 Digital Multimeter?
The item model number of the Klein Tools MM300 Digital Multimeter is MM300, facilitating easy identification and reference.
Who is the manufacturer of the Klein Tools MM300 Digital Multimeter?
The Klein Tools MM300 Digital Multimeter is manufactured by Klein Tools, a reputable company known for producing high-quality electrical tools and instruments.
What is the price of the Klein Tools MM300 Digital Multimeter?
The Klein Tools MM300 Digital Multimeter is priced at $39.97, offering excellent value for its functionality and reliability.
What warranty is provided with the Klein Tools MM300 Digital Multimeter?
Klein Tools offers a one-year warranty from the date of purchase for the MM300 Digital Multimeter, ensuring peace of mind for the user against any manufacturing defects or issues.
What should I do if the display on my Klein Tools MM300 Digital Multimeter is not turning on?
First, ensure that the batteries are inserted correctly and are not depleted. Try replacing them with fresh AAAA batteries as specified by the manufacturer. If the issue persists, contact Klein Tools customer support for further assistance with your MM300 model.
Why am I getting inaccurate voltage readings with my Klein Tools MM300 Digital Multimeter?
Inaccurate readings could be due to several factors. Ensure that the test leads are securely connected to the correct terminals and that there are no loose connections or damaged leads. Additionally, check if the range setting is appropriate for the voltage being measured.
How can I troubleshoot continuity testing issues with my Klein Tools MM300 Digital Multimeter?
If continuity testing is not functioning properly, check the test leads for any damage or breaks. Ensure that the probes are making good contact with the test points. If the issue persists, try cleaning the probe tips and retesting.
What should I do if the resistance measurement feature is not working on my Klein Tools MM300 Digital Multimeter?
Verify that the component under test is not powered and disconnected from any circuit. Ensure that the test leads are properly connected and that the resistance range setting is appropriate for the expected resistance value.
How do I address issues with the rotary dial selector on my Klein Tools MM300 Digital Multimeter?
If the rotary dial selector is not functioning correctly, ensure that it is not obstructed or stuck between positions. Gently rotate the dial through its entire range to see if it frees up.
How can I troubleshoot issues with the display screen flickering on my Klein Tools MM300 Digital Multimeter?
Flickering or erratic display behavior may indicate a power supply issue or a fault in the display circuitry. Check the battery contacts for corrosion or poor connections and ensure that the batteries are securely installed.
What should I do if the input jacks on my Klein Tools MM300 Digital Multimeter are not making proper contact?
Ensure that the test leads are inserted fully into the correct input jacks and that there is no debris or damage obstructing the connections. Try cleaning the jacks with compressed air or a gentle brush.
What steps should I take if my Klein Tools MM300 Digital Multimeter is not functioning properly after a drop or impact?
Inspect the exterior of the multimeter for any visible damage, focusing on the display, selector dial, and input jacks. If there is significant damage, discontinue use and contact Klein Tools for repair or replacement options.
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