MASTECH MY64 Digital Multimeter User Manual

1. Introduction

The MASTECH MY64 is a professional-grade digital multimeter designed for accurate and reliable electrical measurements. It features a 2000-count display, auto power off, data hold, and capabilities for measuring AC/DC voltage, AC/DC current, resistance, capacitance, frequency, temperature, diode, continuity, and transistor hFE. This manual provides essential information for operating and maintaining your MY64 multimeter safely and efficiently.

Figure 1: Front view of the MASTECH MY64 Digital Multimeter.

This image displays the MASTECH MY64 Digital Multimeter from the front, showing its large LCD display, rotary function switch, and input jacks. The green protective casing is visible around the device.

2. Safety Information

To ensure safe operation and service of the meter, follow these instructions carefully. Failure to observe these safety warnings can result in severe injury or death.

• Always adhere to local and national safety codes.
• Do not apply more than the rated voltage, as marked on the meter, between terminals or between any terminal and earth ground. The maximum input voltage is 1000V DC or 750V AC.
• Exercise extreme caution when working with voltages above 60V DC or 30V AC RMS, as these voltages pose a shock hazard.
• Before making resistance, continuity, diode, or capacitance measurements, disconnect circuit power and discharge all high-voltage capacitors.
• Always use the correct terminals, function, and range for your measurement.
• Inspect the test leads for damaged insulation or exposed metal before each use. Replace if damaged.
• Do not operate the meter if it appears damaged or if the case is open.
• Remove the test leads from the meter before opening the battery cover.
• Ensure the battery is correctly installed before use.
• The meter complies with IEC61010-1 safety standards.

3. Product Features

The MASTECH MY64 Digital Multimeter offers a range of features for versatile electrical testing:

• Display: 2000 counts for clear readings.
• Auto Power Off: Conserves battery life.
• Transistor hFE: Measurement range of 0~1000.
• Diode Test: Open Voltage 3.0V.
• Continuity Buzzer: Sounds when resistance is less than 50Ω.
• Data Hold: Freezes the displayed reading for convenience.
• Low Battery Display: Indicates when batteries need replacement.
• Measurement Capabilities: AC/DC Voltage, AC/DC Current, Resistance, Capacitance, Frequency, Temperature.

4. Components and Controls

Familiarize yourself with the various parts of your MY64 multimeter:

• LCD Display: Shows measurement readings, units, and function indicators.
• Rotary Switch: Used to select the desired measurement function and range.
• "ON/OFF" Button: Powers the multimeter on or off.
• "HOLD" Button: Freezes the current reading on the display.
• Input Jacks:
  • "COM" Jack: Common terminal for all measurements (negative input).
  • "VΩHz" Jack: Positive input for Voltage, Resistance, Frequency, Diode, Continuity, and Capacitance measurements.
  • "mA" Jack: Positive input for current measurements up to 200mA.
  • "10A" Jack: Positive input for high current measurements up to 10A (unfused).
  • "hFE" Socket: For testing transistors.
  • "Temp" Socket: For temperature probe input.
• Protective Holster: A durable green rubber casing that protects the meter from drops and impacts.
• Kickstand: Located on the back of the holster, allows the meter to stand upright for easier viewing.

Figure 2: Side view of the MASTECH MY64 showing the extended kickstand.

This image shows the MASTECH MY64 Digital Multimeter from a side angle, with its integrated kickstand extended, allowing the device to stand upright for convenient hands-free operation.

Figure 3: MASTECH MY64 with its protective green casing removed.

This image illustrates the MASTECH MY64 Digital Multimeter with its green protective rubber casing separated from the main unit, demonstrating the removable nature of the protective cover.

5. Setup

5.1 Battery Installation

The MASTECH MY64 requires 2 LR44 batteries (included). To install or replace batteries:

1. Ensure the multimeter is turned OFF and disconnect all test leads from the input jacks.
2. Locate the battery compartment cover on the back of the meter.
3. Use a screwdriver to loosen the screw(s) securing the battery cover.
4. Remove the cover.
5. Insert the 2 LR44 batteries, observing the correct polarity (+ and -) as indicated inside the compartment.
6. Replace the battery cover and secure it with the screw(s).

5.2 Connecting Test Leads

Always connect the black test lead to the "COM" jack. Connect the red test lead to the appropriate positive (+) input jack based on the measurement you intend to make:

• For Voltage, Resistance, Frequency, Diode, Continuity, and Capacitance measurements, connect the red lead to the "VΩHz" jack.
• For current measurements up to 200mA, connect the red lead to the "mA" jack.
• For high current measurements up to 10A, connect the red lead to the "10A" jack.

6. Operating Instructions

Before taking any measurement, ensure the meter is set to the correct function and range. Always refer to the safety information before proceeding.

6.1 DC Voltage Measurement (V=)

1. Connect the black test lead to the "COM" jack and the red test lead to the "VΩHz" jack.
2. Set the rotary switch to the desired DC Voltage range (e.g., 200mV, 2V, 20V, 200V, 1000V). If the voltage is unknown, start with the highest range and decrease as needed.
3. Connect the test leads in parallel to the circuit or component under test.
4. Read the voltage value on the LCD display.

6.2 AC Voltage Measurement (V~)

1. Connect the black test lead to the "COM" jack and the red test lead to the "VΩHz" jack.
2. Set the rotary switch to the desired AC Voltage range (e.g., 200V, 750V).
3. Connect the test leads in parallel to the AC circuit or component under test.
4. Read the voltage value on the LCD display.

6.3 DC Current Measurement (A=)

1. Important: Disconnect power to the circuit before connecting the meter in series.
2. Connect the black test lead to the "COM" jack. For currents up to 200mA, connect the red lead to the "mA" jack. For currents up to 10A, connect the red lead to the "10A" jack.
3. Set the rotary switch to the desired DC Current range (e.g., 2mA, 20mA, 200mA, 10A). Start with the highest range if the current is unknown.
4. Connect the meter in series with the circuit.
5. Apply power to the circuit and read the current value on the LCD display.

6.4 AC Current Measurement (A~)

1. Important: Disconnect power to the circuit before connecting the meter in series.
2. Connect the black test lead to the "COM" jack. For currents up to 200mA, connect the red lead to the "mA" jack. For currents up to 10A, connect the red lead to the "10A" jack.
3. Set the rotary switch to the desired AC Current range (e.g., 20mA, 200mA, 10A). Start with the highest range if the current is unknown.
4. Connect the meter in series with the circuit.
5. Apply power to the circuit and read the current value on the LCD display.

6.5 Resistance Measurement (Ω)

1. Important: Disconnect power from the circuit and discharge all capacitors before measuring resistance.
2. Connect the black test lead to the "COM" jack and the red test lead to the "VΩHz" jack.
3. Set the rotary switch to the desired Resistance range (e.g., 200Ω, 2kΩ, 20kΩ, 200kΩ, 2MΩ, 200MΩ).
4. Connect the test leads across the component to be measured.
5. Read the resistance value on the LCD display.

6.6 Diode Test (→|)

1. Important: Disconnect power from the circuit and discharge all capacitors.
2. Connect the black test lead to the "COM" jack and the red test lead to the "VΩHz" jack.
3. Set the rotary switch to the Diode Test function.
4. Connect the red lead to the anode and the black lead to the cathode of the diode. The display will show the forward voltage drop.
5. Reverse the leads. The display should show "OL" (Open Loop) for a good diode.

6.7 Continuity Test ())))

1. Important: Disconnect power from the circuit.
2. Connect the black test lead to the "COM" jack and the red test lead to the "VΩHz" jack.
3. Set the rotary switch to the Continuity Test function.
4. Connect the test leads across the circuit or component. If the resistance is less than 50Ω, the buzzer will sound, indicating continuity.

6.8 Transistor hFE Test

1. Set the rotary switch to the hFE function.
2. Identify if the transistor is NPN or PNP.
3. Insert the transistor leads (Emitter, Base, Collector) into the corresponding holes in the hFE socket.
4. Read the hFE value on the LCD display.

6.9 Capacitance Measurement (F)

1. Important: Disconnect power from the circuit and fully discharge the capacitor before testing.
2. Connect the black test lead to the "COM" jack and the red test lead to the "VΩHz" jack.
3. Set the rotary switch to the desired Capacitance range (e.g., 2nF, 20nF, 200nF, 2µF, 20µF, 100µF).
4. Connect the test leads across the capacitor.
5. Read the capacitance value on the LCD display.

6.10 Temperature Measurement (Temp)

1. Connect the K-type thermocouple (included) to the "Temp" socket, observing polarity.
2. Set the rotary switch to the "Temp" function.
3. Place the thermocouple probe at the point where temperature is to be measured.
4. Read the temperature value on the LCD display. The MY64 supports measurements from -20°C to 1000°C.

Figure 4: Measurement ranges and accuracy for MY60-MY64 series multimeters.

This image presents a detailed table outlining the various measurement ranges, resolutions, and accuracy specifications for the MASTECH MY60, MY61, MY62, MY63, and MY64 digital multimeters across different functions like DC Voltage, AC Voltage, DC Current, AC Current, Resistance, Capacitance, Frequency, and Temperature.

Figure 5: Visual comparison of MASTECH MY60, MY61, MY62, MY63, MY64, and MY68 models.

This image displays a grid of different MASTECH multimeter models (MY60, MY61, MY62, MY63, MY64, MY68), each with a brief description of their key specifications such as AC/DC current/voltage, resistance, LCD display counts, continuity, capacitance, and frequency, allowing for easy comparison between models.

7. Maintenance

7.1 Cleaning

Wipe the meter's case with a damp cloth and mild detergent. Do not use abrasives or solvents. Keep the input terminals free of dirt and moisture.

7.2 Battery Replacement

When the "Low Battery" indicator appears on the display, replace the 2 LR44 batteries as described in Section 5.1. Prompt battery replacement ensures accurate readings and proper operation.

7.3 Storage

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

8. Troubleshooting

9. Specifications

Detailed technical specifications for the MASTECH MY64 Digital Multimeter:

Figure 6: Detailed specifications and typical applications for the MY64.

This image provides a comprehensive overview of the MASTECH MY64 Digital Multimeter, including its SKU, UPC, and EAN codes, a list of key features, detailed electrical specifications (AC/DC Voltage, Current, Resistance, Capacitance, Frequency, Temperature, Continuity, Display Counts), main applications (Domestic, Industrial, Electronics), and contents of the package (test leads, thermocouple, battery, calibration certificate, quick start guide).

10. Warranty and Support

MASTECH products are designed for reliability and performance. For any technical support, warranty claims, or service inquiries, please contact your authorized MASTECH dealer or visit the official MASTECH website.

For more information and product updates, you may visit the Mastech Store on Amazon.