Mastech M1015B Digital Multimeter

Product Overview

The Mastech M1015B is an auto/manual ranging digital multimeter designed for various electrical measurements. It features a backlit LCD screen and provides sound and light warnings for incorrect jack usage, enhancing user safety and convenience. This multimeter is suitable for both professional and hobbyist use, offering a comprehensive set of measurement capabilities.

Key features include:

• AC/DC Voltage measurement up to 1000V.
• AC/DC Current measurement up to 10A.
• Resistance measurement up to 40Mohm.
• Frequency measurement up to 200KHz.
• Capacitance measurement up to 200uF.
• Diode check and continuity testing.
• hFE (transistor gain) measurement.
• Relative measurement function.
• LED/sound warning for incorrect banana jack connections.
• Auto and manual ranging capabilities.
• All ranges are fused (resettable) for protection.
• Auto power-off function (can be disabled).
• Blue LED backlit LCD display for clear readings in various lighting conditions.

Figure 1: An example of the M1015B series multimeter, shown here as an Analog Multimeter under the 'Commercial Electric' brand in its retail packaging. This image illustrates the general form factor and dial layout, though the Mastech M1015B described in this manual is a digital model. The packaging indicates 300VAC/300VDC capabilities and includes a 1.5V AA battery.

Safety Information

Always observe the following safety precautions when using the Mastech M1015B Digital Multimeter to prevent personal injury or damage to the meter or equipment under test.

• Do Not Exceed Maximum Input Limits: Never apply voltage or current that exceeds the specified maximum input limits for each range. Refer to the specifications section for detailed limits.
• Use Correct Terminals and Functions: Ensure the test leads are connected to the correct input terminals and the rotary switch is set to the appropriate function and range before making any measurements. The meter provides a warning for incorrect jack usage.
• Inspect Test Leads: Before each use, inspect the test leads for damaged insulation or exposed metal. Replace damaged leads immediately.
• Avoid Wet Conditions: Do not use the meter in wet environments or with wet hands.
• Work on De-energized Circuits: Whenever possible, disconnect power from the circuit under test before making resistance, continuity, or diode measurements.
• Be Cautious with High Voltages: Exercise extreme caution when working with voltages above 30V AC RMS, 42V peak, or 60V DC. These voltages pose a shock hazard.
• Battery and Fuse Replacement: Disconnect test leads from any circuit and turn off the meter before opening the battery or fuse compartment. Use only specified replacement parts.
• Proper Category Rating: This meter is rated CAT II 300V. Do not use it for measurements in higher category installations (e.g., main power distribution).

Setup

1. Battery Installation

The Mastech M1015B requires one 1.5V AA battery for operation. To install or replace the battery:

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 meter.
3. Use a screwdriver to remove the screw securing the battery compartment cover.
4. Carefully remove the cover.
5. Insert the 1.5V AA battery, observing the correct polarity (+ and -) as indicated inside the compartment.
6. Replace the battery compartment cover and secure it with the screw.

2. Connecting Test Leads

The multimeter comes with a pair of test leads (red and black). Connect them as follows:

• Insert the black test lead into the "COM" (Common) input jack. This is the negative (-) terminal.
• For most voltage, resistance, and diode measurements, insert the red test lead into the "VΩmA" input jack. This is the positive (+) terminal.
• For current measurements (mA), ensure the red lead is in the appropriate current jack if available, or the "VΩmA" jack if it supports the desired current range. Always verify the correct jack for the selected function to avoid damage.

Operating Instructions

This section provides general instructions for using the Mastech M1015B Digital Multimeter. Always refer to the specific measurement type for detailed steps.

General Operation Steps:

1. Select Function: Turn the rotary switch to the desired measurement function (e.g., V~ for AC Voltage, V- for DC Voltage, Ω for Resistance, A- for DC Current).
2. Select Range: If the meter is not auto-ranging for the selected function, choose an appropriate range that is higher than the expected measurement value.
3. Connect Leads: Connect the test leads to the correct input terminals on the meter and then to the circuit or component under test.
4. Read Measurement: Observe the reading on the LCD display. The blue backlight can be activated for better visibility.
5. Disconnect: After measurement, disconnect the test leads from the circuit first, then from the meter.

Specific Measurement Types:

• DC Voltage Measurement (V-):

  Set the rotary switch to the desired DC Voltage range (e.g., 2.5V, 10V, 50V, 250V, 300V). Connect the red lead to the positive side of the circuit and the black lead to the negative side. Read the voltage value.
• AC Voltage Measurement (V~):

  Set the rotary switch to the desired AC Voltage range (e.g., 10V, 50V, 250V, 300V). Connect the leads across the AC voltage source. Read the voltage value.

• DC Current Measurement (mA-):

  Set the rotary switch to the desired DC Current range (e.g., 10mA, 250mA). Important: The meter must be connected in series with the circuit. Disconnect power, break the circuit, insert the meter, then reapply power. Ensure the red lead is in the correct current input jack.

• Resistance Measurement (Ω):

  Set the rotary switch to the desired Resistance range (e.g., X10, X1k). Ensure the circuit or component is de-energized before measuring. Connect the leads across the component. The meter will display the resistance value.
• Battery Test (BAT):

  Set the rotary switch to the BAT position. Connect the leads to the battery terminals, observing polarity. The meter will indicate the battery's condition (e.g., "GOOD", "REPLACE").

• Continuity Test:

  Set the rotary switch to the continuity function (often shared with resistance or diode). Connect the leads across the circuit path. A low resistance reading or an audible beep indicates continuity.

Maintenance

Proper maintenance ensures the longevity and accuracy of your Mastech M1015B Digital Multimeter.

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 debris.

2. Battery Replacement

When the battery low indicator appears on the display, replace the 1.5V AA battery as described in the "Setup" section. Remove the battery if the meter is not to be used for an extended period to prevent leakage.

3. Fuse Replacement

The Mastech M1015B features resettable fuses for protection. In case of an overload that trips a fuse, the meter may temporarily stop functioning for the affected range. Disconnect the meter from the circuit and allow a few moments for the fuse to reset. If the issue persists, or if the meter uses non-resettable fuses (which is not indicated for this model), consult a qualified technician or the manufacturer for service.

Troubleshooting

If you encounter issues with your Mastech M1015B, refer to the following common problems and solutions:

Specifications

Warranty and Support

The Mastech M1015B Digital Multimeter comes with a 1-year warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use.

For warranty claims, technical support, or service inquiries, please contact Mastech customer service. Keep your purchase receipt as proof of purchase.

For more information, you may visit the official Mastech website or contact their support channels. Specific contact details are typically provided with the product packaging or on the manufacturer's website.