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Crucial safety instructions and precautions to prevent injury or death during meter operation.
Explanation of symbols displayed on the multimeter's housing for identification.
Key to understanding the various icons and indicators shown on the digital display.
Detailed guide for measuring AC voltage, including setup and range selection.
Instructions for measuring DC voltage, including settings and notes on readings.
Procedures for measuring DC current within 200mA and 10A ranges.
Steps for measuring resistance, including circuit preparation and range selection.
How to perform continuity tests, including audible signals and open circuit indications.
Procedure for testing diodes, including forward/reverse bias indications.
Method for testing batteries to determine their condition.
Steps and precautions for replacing the meter's batteries.
Instructions and specifications for replacing internal fuses.
Guidelines for cleaning the multimeter using appropriate methods and materials.
Proper procedures for storing the meter to ensure longevity and performance.
Information regarding the product's compliance with FCC and IC regulations.
Details pertaining to the product's warranty coverage and terms.
Instructions for the proper disposal and recycling of the electronic device.
Crucial safety instructions and precautions to prevent injury or death during meter operation.
Explanation of symbols displayed on the multimeter's housing for identification.
Key to understanding the various icons and indicators shown on the digital display.
Detailed guide for measuring AC voltage, including setup and range selection.
Instructions for measuring DC voltage, including settings and notes on readings.
Procedures for measuring DC current within 200mA and 10A ranges.
Steps for measuring resistance, including circuit preparation and range selection.
How to perform continuity tests, including audible signals and open circuit indications.
Procedure for testing diodes, including forward/reverse bias indications.
Method for testing batteries to determine their condition.
Steps and precautions for replacing the meter's batteries.
Instructions and specifications for replacing internal fuses.
Guidelines for cleaning the multimeter using appropriate methods and materials.
Proper procedures for storing the meter to ensure longevity and performance.
Information regarding the product's compliance with FCC and IC regulations.
Details pertaining to the product's warranty coverage and terms.
Instructions for the proper disposal and recycling of the electronic device.
The Klein Tools MM325 is a manual-ranging digital multimeter designed for measuring AC/DC voltage, DC current, and resistance. It also features capabilities for testing batteries, diodes, and continuity.
The MM325 multimeter is equipped with a 2000-count LCD display, providing clear readings for various measurements. The core functionality is controlled by a Function Selector switch, which allows users to switch between different measurement modes.
For DC Voltage measurements (up to 600V), the RED test lead is inserted into the VΩ jack and the BLACK test lead into the COM jack. The Function Selector switch is rotated to the highest V DC setting, and then successively lowered to obtain higher resolution measurements. The device can measure down to 200.0mV with 0.1mV resolution.
For AC Voltage measurements (up to 600V, 50 to 60Hz), the setup is similar, with the RED test lead in the VΩ jack and BLACK in the COM jack. The Function Selector switch is rotated to the highest V AC setting, then lowered for higher resolution. The multimeter can measure down to 200.0V with 0.1V resolution. A hazardous voltage indicator will appear for voltages above 30V.
DC Current measurements are divided into two ranges. For currents between 200mA and 10A, the RED test lead is inserted into the 10A jack and the BLACK test lead into the COM jack. The Function Selector switch is set to the 10A DC setting. For currents less than 200mA, the RED test lead goes into the VΩ jack and the BLACK test lead into the COM jack, with the Function Selector switch set to the highest mA DC setting (200mA). Users are advised to remove power from the circuit, open the circuit at the measurement point, connect the meter in-series, and then apply power. The device can measure down to 200.0μA with 0.1μA resolution. A warning is given not to attempt to measure more than 10A, and for currents greater than 6A, a measurement time of 30 seconds followed by 10 minutes of recovery time is recommended.
Resistance measurements are performed by inserting the RED test lead into the VΩ jack and the BLACK test lead into the COM jack, then rotating the Function Selector switch to the highest Ω setting (2MΩ). Power must be removed from the circuit before measuring resistance. The Function Selector switch can be rotated to lower Ω settings for higher resolution. If the test leads are open or a failed resistor is under test, the display will indicate "OL." The device can measure down to 200.0Ω with 0.1Ω resolution.
Continuity checks involve inserting the RED test lead into the VΩ jack and the BLACK test lead into the COM jack, then rotating the Function Selector switch to the continuity setting. Power must be removed from the circuit. If resistance is less than 100Ω, an audible signal will sound, and the display will show a resistance value. If the circuit is open, "OL" will be displayed.
Diode Test is performed by inserting the RED test lead into the VΩ jack and the BLACK test lead into the COM jack, and rotating the Function Selector switch to the diode setting. Touching the test leads to a diode will show a reading of 200-700mV for forward bias, "OL" for reverse bias, and approximately 0mV for a shorted device. An open device will show "OL" in both polarities.
Battery Test allows for testing 1.5V and 9V batteries. The RED test lead is inserted into the VΩ jack and the BLACK test lead into the COM jack. The Function Selector switch is rotated to the 1.5V or 9V battery test setting. The BLACK lead connects to the negative terminal and the RED lead to the positive terminal of the battery. Batteries in good condition should show a voltage within approximately 10% of the rated voltage.
The MM325 incorporates several user-friendly features to enhance safety and convenience:
The MM325 is designed for straightforward maintenance, primarily involving battery and fuse replacement:
General| Diode test | Yes |
|---|---|
| Product type | Digital multimeter |
| Product color | Black, Orange |
| DC current range | 0 - 10 A |
| DC voltage range | 0 - 600 V |
| Housing material | Acrylonitrile butadiene styrene (ABS) |
| Resistance range | 0 - 2000000 Ω |
| Measuring category | CAT III 600V |
| Placement supported | Handheld multimeter |
| Sustainability certificates | UKCA |
| Battery type | AAA |
| Power source | Battery |
| Number of batteries supported | 2 |
Weight and Dimensions| Depth | 162 mm |
|---|---|
| Width | 79 mm |
| Height | 46 mm |
| Weight | 250 g |
