MASTECH MY60-MY68 Series Digital Multimeter User Manual

1. Introduction

Thank you for choosing the MASTECH MY60-MY68 Series Manual Ranging Digital Multimeter. This instrument is designed to be a safe, accurate, and reliable tool for various electrical measurements. It is suitable for household appliance maintenance, electrician maintenance, transformer work monitoring, troubleshooting of three-phase motor faults, air-conditioning refrigeration and heating fault diagnosis, and use in schools and laboratories.

Note: Batteries are not included with the product.

2. Safety Information

Please read all safety information and operating instructions carefully before using this instrument. Failure to do so may result in electric shock, fire, or damage to the instrument.

• Always ensure the multimeter is set to the correct range and function before making measurements.
• Do not exceed the maximum input values specified for each range.
• Use caution when working with voltages above 30V AC RMS, 42V peak, or 60V DC, as these pose a shock hazard.
• Disconnect power to the circuit and discharge all high-voltage capacitors before testing resistance, continuity, diodes, or capacitance.
• Replace the battery when the low battery indicator appears to ensure accurate readings.
• The instrument is rated CAT II 1000V / CAT III 600V.

3. Product Overview

The MASTECH MY60-MY68 series multimeters are handheld, manual ranging digital multimeters featuring a clear LCD display and robust design.

Key Features:

• Display: 2000 counts (MY60-MY64), 4000 counts (MY68), 20000 counts (MY65)
• Auto Power Off: Conserves battery life.
• Data Hold: Freezes the displayed reading.
• Low Battery Display: Indicates when battery replacement is needed.
• Transistor hFE Test: For checking transistor gain (0-1000).
• Diode Test: Measures forward voltage drop (Open Voltage 3.0V).
• Continuity Test: Audible buzzer for low resistance circuits (<50Ω for MY60-MY64, <500Ω for MY68, <70Ω for MY65).

Dimensions & Weight:

• MY60-MY64 Series: 195mm x 95mm x 55mm (7.67" x 3.74" x 2.16"), 366g (0.8lb)
• MY68 Series: 189mm x 91mm x 31.5mm (7.2" x 3.4" x 1.3"), 310g (0.7lb)

4. Specifications

The following tables detail the measurement ranges, resolutions, and accuracies for the different models.

MY60, MY61, MY62, MY63, MY64 Series Specifications:

MY65 Series Specifications:

MY68 Series Specifications:

The MY68 model features Auto Ranging and a 4000-count display.

5. Setup and Battery Installation

The multimeter requires one 9V 6F22 battery (not included) for operation.

Battery Installation:

1. Ensure the multimeter is turned OFF.
2. Locate the battery compartment cover on the back of the unit.
3. Use a screwdriver to remove the screw securing the battery cover.
4. Carefully remove the cover.
5. Connect a new 9V 6F22 battery to the battery clips, observing correct polarity.
6. Place the battery into the compartment.
7. Replace the battery cover and secure it with the screw.

Initial Setup:

After installing the battery, turn the rotary switch to any measurement function to power on the device. The display should light up. If not, check the battery installation or replace the battery.

6. Operating Instructions

This section provides general guidance for using the multimeter's various functions. Always refer to the specific model's markings on the rotary switch for exact ranges.

General Measurement Steps:

1. Insert the black test lead into the 'COM' jack.
2. Insert the red test lead into the appropriate input jack for the desired measurement (e.g., 'VΩHz' for voltage/resistance/frequency, 'mA' for milliampere current, '10A' for high current).
3. Select the desired function and range using the rotary switch.
4. Connect the test leads to the circuit or component under test.
5. Read the measurement on the LCD display.

Specific Measurement Functions:

6.1. DC Voltage Measurement (V=)

1. Set the rotary switch to the 'V=' (DC Voltage) range. Choose a range higher than the expected voltage.
2. Connect the red test lead to the positive side and the black test lead to the negative side of the DC voltage source.
3. Read the voltage value on the display.

6.2. AC Voltage Measurement (V~)

1. Set the rotary switch to the 'V~' (AC Voltage) range. Choose a range higher than the expected voltage.
2. Connect the test leads across the AC voltage source.
3. Read the voltage value on the display.

6.3. DC/AC Current Measurement (A= / A~)

1. IMPORTANT: Ensure the circuit is de-energized before connecting the multimeter in series.
2. Set the rotary switch to the appropriate 'A=' (DC Current) or 'A~' (AC Current) range.
3. For current measurements up to 200mA (MY60-MY64) or 400mA (MY65), insert the red test lead into the 'mA' jack. For currents up to 10A, insert the red test lead into the '10A' jack.
4. Break the circuit and connect the multimeter in series with the load.
5. Apply power to the circuit and read the current value.

6.4. Resistance Measurement (Ω)

1. Ensure the circuit is de-energized and all capacitors are discharged.
2. Set the rotary switch to the 'Ω' (Resistance) range.
3. Connect the test leads across the component to be measured.
4. Read the resistance value.

6.5. Diode Test ()

1. Set the rotary switch to the diode symbol.
2. Connect the red test lead to the anode and the black test lead to the cathode of the diode. The display will show the forward voltage drop.
3. Reverse the leads. The display should show 'OL' (Open Loop) for a good diode.

6.6. Continuity Test ()

1. Set the rotary switch to the continuity symbol.
2. Connect the test leads across the circuit or component.
3. If the resistance is below the threshold (<50Ω for MY60-MY64, <500Ω for MY68, <70Ω for MY65), the buzzer will sound.

6.7. Transistor hFE Test (hFE)

1. Set the rotary switch to the 'hFE' position.
2. Insert the transistor's emitter, base, and collector leads into the corresponding holes in the Multi-Function Socket (NPN or PNP).
3. Read the hFE value on the display.

6.8. Capacitance Measurement (F) (MY61, MY62, MY63, MY64, MY65, MY68 only)

1. Ensure the capacitor is fully discharged before testing.
2. Set the rotary switch to the 'F' (Capacitance) range.
3. Connect the test leads across the capacitor.
4. Read the capacitance value.

6.9. Frequency Measurement (Hz) (MY63, MY64, MY65, MY68 only)

1. Set the rotary switch to the 'Hz' (Frequency) range.
2. Connect the test leads across the signal source.
3. Read the frequency value.

6.10. Temperature Measurement (Temp) (MY62, MY64, MY65 only)

1. Set the rotary switch to the 'Temp' range.
2. Connect the temperature probe (K-type thermocouple, if included) to the appropriate input jacks.
3. Place the probe tip on or near the object whose temperature is to be measured.
4. Read the temperature value on the display.

Data Hold Function:

Press the 'HOLD' button to freeze the current reading on the display. Press it again to release the hold and resume live readings.

7. Maintenance

Cleaning:

Wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents. Keep the test leads clean and free of debris.

Battery Replacement:

When the low battery indicator appears on the display, replace the 9V 6F22 battery as described in the 'Setup and Battery Installation' section.

Fuse Replacement:

If the current measurement function stops working, the fuse may need replacement. Refer to the internal diagram in the full user manual for fuse specifications and replacement instructions. Always replace with a fuse of the same type and rating.

8. Troubleshooting

• No display or faint display: Check battery installation, replace battery if low.
• Incorrect readings: Ensure correct function and range are selected. Check test lead connections. Verify battery level.
• No current measurement: Check if the fuse is blown. Replace if necessary.
• 'OL' (Overload) displayed: The measured value exceeds the selected range. Select a higher range or check if the circuit is open.
• Negative sign displayed: Indicates reversed polarity for DC measurements.

9. User Tips

• For accurate resistance measurements, ensure the component is isolated from the circuit.
• When measuring current, always connect the multimeter in series with the load. Never connect it in parallel across a voltage source, as this can blow the fuse or damage the meter.
• Utilize the Data Hold function when taking measurements in hard-to-reach areas to easily record the reading.
• Keep the multimeter and accessories in a dry, clean environment to prolong their lifespan.

10. Included Accessories

• Test Leads (Red and Black)
• Multi-Function Socket (for hFE test)
• User's Manual
• Temperature Probe (for models with temperature function, e.g., MY62, MY64, MY65)

11. Warranty and Support

For warranty claims or technical support, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase. This product is certified RoHS compliant.

12. Additional Resources

For a visual demonstration of Mastech measuring instruments and their applications, please watch the following video: