MASTECH MAS838 Digital Multimeter

Quick Start Guide

Safety Precautions

Special attention should be paid when using this test and measurement instrument because improper usage may cause electric shock and damage the equipment.

Use proper measurement category (CAT), voltage, and amperage rated probes, test leads, and adapters for the measurement.
Do not use or store the device around explosive gas, vapor, or under high temperature and humidity.
When handling the test probes and crocodile clips, keep your fingers behind the physical guard.
Examine the measuring test leads (if present) before use. Any element of which the insulation is deteriorated (even partially), replace them with proper functional test leads.
Connect the common test lead before the live test lead and remove the live test lead before the common test lead.
Before measuring current, make sure the instrument fuses are available and disconnect the power supply to the circuit being tested.
Remove the batteries if the device is not used for an extended period of time, or if stored in temperatures above 45 °C. If the batteries are not removed, battery leakage can damage the device.

Specifications

Measurement	Range	Resolution	Accuracy
V~ (AC Voltage)	200V/600V	0.1V/1V	±(1.2%+10)
V= (DC Voltage)	200mV/2V/20V/200V/600V	0.1mV/1mV/10mV/0.1V/1V	±(0.5%+3)
A= (DC Current)	20mA/200mA/10A	0.01mA/0.1mA/10mA	±(1.0%+3) for 20mA, ±(1.0%+3) for 200mA, ±(1.5%+5) for 10A
Ω (Resistance)	200Ω/2kΩ/20kΩ/200kΩ/2MΩ	0.1Ω/1Ω/10Ω/100Ω/1kΩ	±(0.8%+5) for 200Ω, ±(0.8%+2) for 2kΩ-200kΩ, ±(1.0%+5) for 2MΩ
°C/°F (Temperature)	-20°C~0°C	1°C	±(10%+2)
	0°C~400°C	1°C	±(1.0%+3)
	400°C~1000°C	1°C	±(2.0%+0)

Basic Usage Examples

The following diagrams illustrate basic measurement procedures:

DC Voltage Measurement

Diagram Description: The multimeter is set to DC Voltage (V=). The red probe is connected to the VΩmA jack, and the black probe to the COM jack. The probes are then connected in parallel to the voltage source. The display shows 12.56V.

AC Voltage Measurement

Diagram Description: The multimeter is set to AC Voltage (V~). The red probe is connected to the VΩmA jack, and the black probe to the COM jack. The probes are then connected in parallel to the AC power source. The display shows 220V.

DC Current Measurement (10A)

Diagram Description: The multimeter is set to DC Current (A=) with the 10A range selected. The red probe is connected to the 10A jack, and the black probe to the COM jack. The multimeter is connected in series with the circuit. The display shows 150.6mA (Note: The diagram shows mA, but the range is 10A).

Resistance Measurement

Diagram Description: The multimeter is set to Resistance (Ω). The red probe is connected to the VΩmA jack, and the black probe to the COM jack. The probes are placed across the resistor. The display shows 1005Ω.

Diode Test

Diagram Description: The multimeter is set to Diode Test (symbol resembling a diode). The red probe is connected to the VΩmA jack, and the black probe to the COM jack. The probes are placed across the diode. The display shows 0.6V.

Capacitance Measurement

Diagram Description: The multimeter is set to Capacitance (symbol resembling a capacitor). The red probe is connected to the VΩmA jack, and the black probe to the COM jack. The capacitor is connected to the probes. The display shows 35µF.

hFE (Transistor Test)

Diagram Description: The multimeter is set to hFE. The transistor is inserted into the hFE socket according to the pinout. The display shows 100.

Temperature Measurement (°C/°F)

Diagram Description: The multimeter is set to Temperature (°C/°F). The red probe is connected to the VΩmA jack, and the black probe to the COM jack. The temperature probe is placed in the environment to be measured. The display shows 25°C.

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