MASTECH MS8221C Digital Multimeter

Introduction

This Quick Start Guide provides essential information for the MASTECH MS8221C Digital Multimeter. It covers specifications, important safety precautions, and basic operational examples.

Specifications

Safety Precautions

Important: Special attention must be paid when using this test and measurement instrument, as improper usage can cause electric shock and damage the equipment.

• Use probes, test leads, and adapters with the correct Measurement Category (CAT), voltage, and amperage ratings for your measurement.
• Do not use or store the device in environments with explosive gases, vapors, or under high temperature and humidity.
• When handling test probes and crocodile clips, keep your fingers behind the physical guard.
• Before use, inspect test leads. If any part of the insulation is deteriorated (even partially), replace them with proper functional test leads.
• When connecting test leads, connect the common (black) lead first, then the live (red) lead. When disconnecting, remove the live (red) lead first, then the common (black) lead.
• Before measuring current, ensure the instrument's fuses are intact and disconnect the power supply to the circuit being tested.
• If the device will not be used for an extended period, or if stored in temperatures above 45°C, remove the batteries. Failure to do so may result in battery leakage and damage to the device.

Basic Operation Examples

The following examples illustrate common measurement procedures:

DC Voltage (V=) Measurement

Procedure:

1. Connect the black test lead to the COM jack and the red test lead to the VΩmA jack.
2. Turn the rotary dial to the V= (DC Voltage) setting.
3. Connect the test leads to the circuit under test.
4. Read the voltage value displayed on the screen. Example reading: 220V.

AC Voltage (V~) Measurement

Procedure:

1. Connect the black test lead to the COM jack and the red test lead to the VΩmA jack.
2. Turn the rotary dial to the V~ (AC Voltage) setting.
3. Connect the test leads to the circuit under test.
4. Read the voltage value displayed on the screen. Example reading: 220V.

DC Current (A-) Measurement

Procedure:

1. Connect the black test lead to the COM jack and the red test lead to the ~10A jack.
2. Turn the rotary dial to the A- (DC Current) setting.
3. Connect the test leads in series with the circuit to measure current.
4. Read the current value displayed on the screen. Example reading: 2.53A.

AC Current (A~) Measurement

Procedure:

1. Connect the black test lead to the COM jack and the red test lead to the ~10A jack.
2. Turn the rotary dial to the A~ (AC Current) setting.
3. Connect the test leads in series with the circuit to measure current.
4. Read the current value displayed on the screen. Example reading: 2.53A.

Resistance (Ω) Measurement

Procedure:

1. Connect the black test lead to the COM jack and the red test lead to the VΩmA jack.
2. Turn the rotary dial to the Ω (Resistance) setting.
3. Connect the test leads across the resistor.
4. Read the resistance value displayed on the screen. Example reading: 103.6Ω.

Capacitance (nF/μF) Measurement

Procedure:

1. Connect the black test lead to the COM jack and the red test lead to the VΩmA jack.
2. Turn the rotary dial to the nF/μF (Capacitance) setting.
3. Connect the test leads to the capacitor. Ensure correct polarity for electrolytic capacitors.
4. Read the capacitance value displayed on the screen. Example reading: 125.3μF.

Transistor Test (hFE)

Procedure:

1. Insert the transistor (NPN or PNP) into the appropriate socket on the front panel.
2. Turn the rotary dial to the hFE setting.
3. Read the transistor gain (hFE) value displayed on the screen. Example reading: 100.

Temperature (°C) Measurement

Procedure:

1. Connect the temperature probe to the COM jack and the VΩmA jack.
2. Turn the rotary dial to the °C (Temperature) setting.
3. Place the temperature probe tip on the object to measure temperature.
4. Read the temperature value displayed on the screen. Example reading: 33°C.

Continuity Test (Beep)

Procedure:

1. Connect the black test lead to the COM jack and the red test lead to the VΩmA jack.
2. Turn the rotary dial to the <50Ω setting (indicated by a speaker or beep symbol ?).
3. Touch the test leads to the two points of the circuit.
4. If the resistance is below approximately 50Ω, the multimeter will emit a beep sound, indicating continuity.