The Tenma 72-10395 is a pocket-sized 3 3/4-digit auto-range digital multimeter designed for a wide range of electrical measurements. Its compact size, lightweight design, and stable performance make it an ideal tool for both professionals and hobbyists. The multimeter is built to IEC61010 standards, featuring double insulation, CAT II 600V overvoltage protection, and pollution grade 2 safety, ensuring safe operation.
Function Description:
The Tenma 72-10395 is capable of measuring various electrical parameters, including:
- AC/DC Voltage: It can measure both alternating current (AC) and direct current (DC) voltages, allowing users to check power sources and circuits.
- Frequency and Duty Cycle: The device can measure the frequency of AC signals and their duty cycle, which is useful for analyzing waveforms and pulse-width modulated signals.
- Resistance: It measures electrical resistance, helping to identify faulty components or check circuit continuity.
- Capacitance: The multimeter can measure capacitance, which is essential for testing capacitors in electronic circuits.
- Diode Test: It includes a diode test function to check the forward voltage drop of diodes, helping to determine their functionality.
- Continuity Test: This feature allows for quick checks of circuit continuity, indicated by a buzzer sound, making it easy to detect open circuits or short circuits.
Usage Features:
The multimeter is designed for ease of use with several practical features:
- Auto Range: The auto-ranging capability automatically selects the appropriate measurement range, simplifying operation and preventing incorrect readings.
- LCD Display: A clear LCD displays measurement results, including a negative input indicator ("-") and an "OL" (Over Range) display when the measured value exceeds the selected range.
- Rotary Knob: A central rotary knob is used to select the desired measurement function (e.g., DCV, ACV, Resistance, Capacitance).
- SELECT Button: This button is crucial for switching between different functions within a single rotary knob position, such as resistance, capacitance, diode, and continuity tests. It also activates the device from standby mode and cancels the auto power-off function.
- REL (Relative Value Measurement) Button: This feature allows users to set the current reading as a reference value, and subsequent measurements will display the difference from this reference. This is particularly useful for comparing values or nulling out test lead resistance.
- HOLD Button: The data hold function allows users to freeze the displayed reading on the LCD, which is convenient for recording measurements in hard-to-reach areas or when the display is not easily visible during the measurement.
- Hz/% Button: This button switches between frequency (Hz) and duty cycle (%) measurements when the rotary knob is set to DCV or ACV.
- Low Battery Indicator: An icon on the LCD indicates when the battery is low, prompting the user to replace it to ensure accurate readings.
- Auto Power Off: To conserve battery life, the multimeter automatically enters standby mode after approximately 30 minutes of inactivity. It can be reactivated by turning the rotary switch or pressing any button.
- Test Probes: The device comes with red and black test probes for connecting to the circuit under test. Users are advised to keep fingers behind the protection ring on the probes for safety.
Maintenance Features:
The Tenma 72-10395 is designed for straightforward maintenance to ensure its longevity and accuracy:
- Battery Replacement: When the low battery indicator appears, the 3V Lithium-manganese button cell (CR2032) can be easily replaced. This involves disconnecting test probes, turning the knob to OFF, unscrewing the back case, and inserting a new battery.
- Cleaning: The device's case can be cleaned with a soft, wet cloth and a mild detergent. Abrasive cleaners or dissolvents should be avoided to prevent damage.
- Storage: To prevent degradation, the multimeter should not be stored in high temperature or humidity environments, especially moist conditions.
- Safety Warnings: The manual emphasizes several safety rules, such as checking test probe insulation before use, avoiding voltages higher than 600V, and ensuring the back cover is installed before operation. It also warns against changing internal wiring without authorization.
- Capacitance Discharge: Before measuring resistance or capacitance, users are instructed to ensure that the circuit's power is turned off and all capacitors are fully discharged to prevent meter damage.
- Diode Polarity: When testing diodes with polarity, users are reminded to connect the red probe to the anode and the black probe to the cathode to avoid an "OL" display.
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