TRUPER MUT-39 Professional Digital Multimeter Instruction Manual

1. Introduction

This manual provides essential information for the safe and effective operation of your TRUPER MUT-39 Professional Digital Multimeter. This True RMS digital multimeter is designed for precise and reliable electrical measurements, suitable for both professionals and DIY enthusiasts. Please read this manual thoroughly before use and keep it for future reference.

2. Safety Information

WARNING: Always observe safety precautions when using electrical testing equipment. Failure to do so may result in injury or damage to the meter.

• Do not apply voltage or current that exceeds the maximum rated values specified for the meter.
• Ensure test leads are in good condition and properly connected before making measurements.
• Do not use the meter if it appears damaged or if the case is open.
• Exercise extreme caution when working with live circuits.
• Always turn off power to the circuit and discharge all high-voltage capacitors before measuring resistance, continuity, or diodes.
• Replace batteries when the low battery indicator appears to ensure accurate readings.

3. Product Overview

The TRUPER MUT-39 is a compact and versatile digital multimeter. Below is a diagram highlighting its main components and features.

Figure 1: TRUPER MUT-39 Digital Multimeter Components

Key Components:

• Liquid Crystal Display (LCD): Shows measurement readings and indicators.
• Data Hold Button: Freezes the current reading on the display.
• Rotary Switch: Used to select measurement functions and ranges.
• Input Terminals: Connect test leads for various measurements.
• Thermocouple Probe: Used for temperature measurements.
• Test Leads: Red and black leads for electrical connections.

Features:

• True RMS measurement for accurate results.
• Measures AC/DC Voltage, AC/DC Current, Resistance, Continuity, Diode, Temperature, Frequency, and Duty Cycle.
• Compact and portable design (21.8 x 5.6 x 13.8 cm).
• Battery-powered for convenience.

4. Setup

4.1 Battery Installation

The TRUPER MUT-39 requires batteries for operation (batteries are not included). To install or replace batteries:

1. Ensure the multimeter is turned OFF.
2. Locate the battery compartment on the back of the meter.
3. Use a screwdriver to open the battery compartment cover.
4. Insert the required batteries, observing correct polarity (+ and -).
5. Securely close the battery compartment cover.

4.2 Connecting Test Leads

For most measurements, you will use the red and black test leads. The thermocouple probe is used specifically for temperature measurements.

Figure 2: Test Leads and Thermocouple Probe

• Connect the black test lead to the 'COM' (Common) input terminal.
• Connect the red test lead to the 'VΩmA' input terminal for voltage, resistance, and small current measurements.
• For high current measurements (e.g., 20A), connect the red test lead to the dedicated '20A' input terminal.
• For temperature measurements, connect the thermocouple probe to the designated 'TEMP' input terminals, observing polarity.

5. Operating Instructions

To operate the TRUPER MUT-39, turn the rotary switch to the desired measurement function. Ensure proper test lead connection for each measurement type.

5.1 Voltage Measurement (AC/DC)

1. Set the rotary switch to the 'V~' (AC Voltage) or 'V=' (DC Voltage) position.
2. Connect the test leads in parallel to the circuit or component being measured.
3. Read the voltage value on the LCD.

5.2 Current Measurement (AC/DC)

1. Set the rotary switch to the 'A~' (AC Current) or 'A=' (DC Current) position.
2. Connect the test leads in series with the circuit. For high current, use the '20A' input.
3. Read the current value on the LCD.

5.3 Resistance Measurement

1. Set the rotary switch to the 'Ω' (Resistance) position.
2. Ensure the circuit is de-energized.
3. Connect the test leads across the component to measure its resistance.
4. Read the resistance value on the LCD.

5.4 Continuity Test

Figure 3: Additional Measurement Functions

1. Set the rotary switch to the '♫' (Continuity) position.
2. Ensure the circuit is de-energized.
3. Connect the test leads across the circuit or component.
4. An audible beep indicates continuity (low resistance).

5.5 Diode Test

1. Set the rotary switch to the '→|←' (Diode) position.
2. Ensure the circuit is de-energized.
3. Connect the red test lead to the anode and the black test lead to the cathode of the diode.
4. Read the forward voltage drop on the LCD. Reverse the leads to check for open circuit.

5.6 Temperature Measurement

1. Set the rotary switch to the 'TEMP' position.
2. Connect the thermocouple probe to the designated 'TEMP' input terminals.
3. Place the tip of the thermocouple probe on the object or area to be measured.
4. Read the temperature on the LCD.

5.7 Frequency and Duty Cycle Measurement

1. Set the rotary switch to the 'Hz/DUTY' position.
2. Connect the test leads to the circuit where frequency or duty cycle is to be measured.
3. Use the 'SELECT' button to toggle between Frequency (Hz) and Duty Cycle (%).
4. Read the value on the LCD.

5.8 Data Hold Function

Press the 'SELECT / HOLD' button briefly to freeze the current reading on the display. Press it again to release the hold function.

6. Maintenance

6.1 Cleaning

Wipe the meter with a damp cloth and mild detergent. Do not use abrasives or solvents. Keep the display clean and dry.

6.2 Battery Replacement

When the low battery indicator appears on the display, replace the batteries as described in the 'Battery Installation' section (4.1). Always use the specified battery type.

6.3 Storage

If the meter is not used for an extended period, remove the batteries to prevent leakage and damage. Store the meter in a cool, dry place away from direct sunlight and extreme temperatures.

7. Troubleshooting

• No Display: Check battery installation and ensure batteries are charged.
• Incorrect Readings: Verify correct function selection, proper test lead connection, and ensure the circuit is within the meter's measurement range.
• 'OL' or 'OVER' on Display: Indicates an overload or out-of-range measurement. Select a higher range or verify the circuit conditions.

8. Specifications

Figure 4: TRUPER MUT-39 Multimeter Front View

9. Warranty and Support

For warranty information or technical support, please refer to the documentation included with your purchase or contact Truper customer service directly. Keep your purchase receipt as proof of purchase.