METERK Digital Multimeter User Manual

1. Introduction

This user manual provides detailed instructions for the safe and effective operation of your METERK RM113D and RM113A Digital Multimeters. These multimeters are designed to measure various electrical parameters including voltage, current, resistance, capacitance, frequency, and temperature (RM113D only). They offer stable performance, high precision, high reliability, clear readings, and built-in overload protection, making them suitable for a wide range of electrical testing applications.

Please read this manual thoroughly before using the device and keep it for future reference.

2. Safety Information

To ensure safe operation, always adhere to the following safety precautions:

• Always ensure the multimeter is in the correct function and range before making measurements.
• Do not exceed the maximum input values specified for each range.
• Exercise extreme caution when working with live circuits. High voltages can be dangerous.
• Inspect test leads for damage before each use. Do not use if insulation is cracked or damaged.
• Do not operate the multimeter if it appears damaged or is not functioning properly.
• Keep fingers behind the finger guards on the test probes during measurements.
• Remove test leads from the circuit before changing functions or ranges.
• Replace batteries when the low battery indicator appears to ensure accurate readings.

3. Product Overview

Familiarize yourself with the components of your METERK Digital Multimeter.

3.1 RM113D Multimeter Components

• NCV Sensor: For Non-Contact Voltage detection.
• LCD Display: Large screen for clear readings.
• Function Buttons: For selecting specific measurement modes (e.g., FUNC/Hz, HOLD, Backlight).
• Backlight Key: Activates display backlight and flashlight.
• Protective Shell: Provides durability and protection.
• Function Knob: Rotary switch to select main measurement functions (e.g., V~, V-, A~, A-, Ω, Capacitance, Frequency, Temperature, NCV, Diode, Continuity).
• Input Terminals: Sockets for connecting test leads (COM, VΩmA, 10A).

3.2 RM113A Multimeter Components

• NCV Sensor: For Non-Contact Voltage detection.
• LCD Display: For clear readings.
• HFE Testing Input Terminal: For transistor hFE measurements.
• Function Buttons: For selecting specific measurement modes (e.g., HOLD, Backlight).
• Backlight Key: Activates display backlight and flashlight.
• Protective Shell: Provides durability and protection.
• Function Knob: Rotary switch to select main measurement functions (e.g., V~, V-, A~, A-, Ω, Capacitance, Frequency, Diode, Continuity, hFE).
• Input Terminals: Sockets for connecting test leads (COM, VΩmA, 10A).

3.3 Key Features

• Data Hold (H)
• Continuity Test
• Diode Test
• AC/DC Voltage Measurement (V~, V-)
• Capacitance Measurement (μF)
• AC/DC Current Measurement (A~, A-)
• Auto Power Off
• Flashlight
• Frequency Measurement (HZ)
• Temperature Measurement (RM113D only)
• Duty Cycle Measurement
• Resistance Measurement (Ω)
• Backlight
• NCV (Non-Contact Voltage) Detection
• hFE Test (RM113A only)
• Magnetic Suction Function (RM113D)

4. Setup

4.1 Battery Installation

The multimeter requires 3 AAA batteries (not included) for operation. To install or replace batteries:

1. Ensure the multimeter is turned OFF and disconnect all test leads from the input terminals.
2. Locate the battery compartment cover on the back of the multimeter.
3. Use a screwdriver to open the battery compartment.
4. Insert three AAA batteries, observing the correct polarity (+ and -).
5. Replace the battery compartment cover and secure it with the screw.

Note: Always remove batteries if the device will not be used for an extended period.

5. Operating Modes

To select a measurement function, turn the Function Knob to the desired setting. For functions with multiple sub-modes (e.g., AC/DC Voltage), press the "FUNC/Hz" button (RM113D) or relevant function button (RM113A) to cycle through them.

5.1 Voltage Measurement (AC/DC)

1. Insert the red test lead into the VΩmA terminal and the black test lead into the COM terminal.
2. Turn the Function Knob to the 'V~' (AC Voltage) or 'V-' (DC Voltage) position.
3. Connect the test probes in parallel to the circuit or component you wish to measure.
4. Read the voltage value on the LCD display.

5.2 Current Measurement (AC/DC)

CAUTION: Never connect the multimeter in parallel to a voltage source when measuring current. This can damage the meter and the circuit.

1. For currents up to 600mA, insert the red test lead into the VΩmA terminal. For currents up to 10A, insert the red test lead into the 10A terminal. Insert the black test lead into the COM terminal.
2. Turn the Function Knob to the 'A~' (AC Current) or 'A-' (DC Current) position.
3. Open the circuit and connect the test probes in series with the circuit.
4. Read the current value on the LCD display.

5.3 Resistance Measurement

1. Insert the red test lead into the VΩmA terminal and the black test lead into the COM terminal.
2. Turn the Function Knob to the 'Ω' (Resistance) position.
3. Ensure the circuit or component is de-energized before measuring resistance.
4. Connect the test probes across the component.
5. Read the resistance value on the LCD display.

5.4 Capacitance Measurement

1. Insert the red test lead into the VΩmA terminal and the black test lead into the COM terminal.
2. Turn the Function Knob to the 'μF' (Capacitance) position.
3. Ensure the capacitor is fully discharged before measurement to prevent damage to the meter.
4. Connect the test probes across the capacitor.
5. Read the capacitance value on the LCD display.

5.5 Frequency Measurement

1. Insert the red test lead into the VΩmA terminal and the black test lead into the COM terminal.
2. Turn the Function Knob to the 'Hz' (Frequency) position.
3. Connect the test probes to the signal source.
4. Read the frequency value on the LCD display.

5.6 Temperature Measurement (RM113D Only)

1. Insert the thermocouple into the VΩmA and COM terminals, observing polarity.
2. Turn the Function Knob to the '℃/℉' (Temperature) position.
3. Place the thermocouple tip on or near the object whose temperature you wish to measure.
4. Read the temperature value on the LCD display.

5.7 NCV (Non-Contact Voltage) Detection

The NCV function allows for quick detection of AC voltage without direct contact with wires.

1. Turn the Function Knob to the 'NCV' position.
2. Move the NCV sensor (top of the multimeter) close to the conductor.
3. The multimeter will beep and the NCV indicator will light up if AC voltage is detected. The intensity of the beeps and lights indicates the strength of the electric field.

5.8 Diode Test

1. Insert the red test lead into the VΩmA terminal and the black test lead into the COM terminal.
2. Turn the Function Knob to the Diode symbol position.
3. Connect the red probe to the anode and the black probe to the cathode of the diode.
4. The display will show the forward voltage drop. Reverse the probes; the display should show OL (Open Loop) for a good diode.

5.9 Continuity Test

1. Insert the red test lead into the VΩmA terminal and the black test lead into the COM terminal.
2. Turn the Function Knob to the Continuity symbol position.
3. Connect the test probes across the component or circuit path.
4. If continuity exists (resistance below a certain threshold), the buzzer will sound.

5.10 hFE Test (RM113A Only)

1. Turn the Function Knob to the 'hFE' position.
2. Insert the transistor's emitter, base, and collector leads into the corresponding hFE testing input terminals on the multimeter.
3. Read the hFE (DC current gain) value on the LCD display.

5.11 Data Hold Function

Press the "HOLD" button to freeze the current reading on the display. Press it again to release the hold function.

5.12 Backlight and Flashlight

Press the Backlight Key (often marked with a light bulb symbol) to turn on the display backlight. Press and hold the same button to activate the flashlight (located at the top of the multimeter). Press again to turn off.

6. User Tips

• For accurate temperature readings with the RM113D, ensure the thermocouple is properly connected and in direct contact with the surface or medium being measured.
• The magnetic back feature (RM113D) is useful for hands-free operation, allowing you to attach the multimeter to metal surfaces while taking measurements.
• Always double-check the function knob setting before connecting the test leads to avoid damaging the multimeter or the circuit.

7. Maintenance

7.1 Cleaning

Wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents. Keep the terminals free from dirt and moisture.

7.2 Storage

If the multimeter is not used for a long time, remove the batteries to prevent leakage and damage to the device. Store the multimeter in a cool, dry place away from direct sunlight and extreme temperatures.

8. Troubleshooting

9. Specifications

9.1 General Specifications (Both Models)

• Main material: Plastics
• Operating Mode: Auto Range
• Display Type: Digital Display
• Operating Temperature: 0 - 40 ℃
• Dimensions: 147 * 71 * 45 mm / 5.79 * 2.80 * 1.77in
• Battery: 3 * AAA batteries (NOT included)
• Certification: CE
• Origin: Mainland China
• DIY Supplies: Electrical

9.2 RM113D Specific Specifications

9.3 RM113A Specific Specifications

Note: The RM113A model does not include temperature, capacitance, or frequency measurement capabilities as standard.

10. Package Contents

10.1 RM113D Package Includes:

• 1 x METERK RM113D Digital Multimeter
• 1 x English User Manual
• 1 pair x Electronic Test Probes (Red and Black)
• 1 x Thermocouple (Max 400 degrees)

10.2 RM113A Package Includes:

• 1 x METERK RM113A Digital Multimeter
• 1 x English User Manual
• 1 pair x Electronic Test Probes (Red and Black)

11. Warranty and Support

Your METERK Digital Multimeter is covered by a standard manufacturer's warranty against defects in materials and workmanship. For warranty claims or technical support, please contact the seller or manufacturer directly. Keep your purchase receipt as proof of purchase.