LOMVUM T28B User Manual

Auto-ranging digital multimeter with true rms

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T28B User Manual

Auto-ranging Digital Multimeter with TRUE RMS

Thank you for your purchase of this precision instrument, the T28B multi-meter. We

hope that this precision instrument will be one of the supporting tools contributing

to your work efficiency.

Before using the device, please read the manual carefully and if you have any

questions, kindly contact our customer service via email.

HEMITEK2022@126.COM

Thank you for your support.

Table of Contents

Summary of Contents for LOMVUM T28B

Page 1 T28B User Manual Auto-ranging Digital Multimeter with TRUE RMS Thank you for your purchase of this precision instrument, the T28B multi-meter. We hope that this precision instrument will be one of the supporting tools contributing to your work efficiency. Before using the device, please read the manual carefully and if you have any questions, kindly contact our customer service via email.
Page 2: Table Of Contents
Contents Safety Information..................03 Safety instructions..................03 Safety symbols....................04 Overview.......................05 Product Functions Overview................05 Backlight / Flashlight..................06 Auto Power Off....................06 Display Hold....................06 Manual and Auto-Ranging................06 Measurement....................06 DC/AC Voltage Measurement...............07 Resistance Measurement................07 Diode Measurement..................08 Continuity Measurement................08 Capacitance Measurement................09 Frequency/Duty Measurement..............09 DC/AC Current Measurement...............09-10 NCV Test......................10 Temperature Measurement................11 Specifications....................11...
Page 3: Safety Information
Safety Information The Meter conforms to IEC61010-1 CAT III 600V, 1000V CAT II IEC61010 and pollution level 2. Safety instructions *When using this meter, the user must comply with all the standard safety regulations as follows: 1) Protection against electric shocks. 2) Preventing the misuse of the multimeter safety procedures.
Page 4: Safety Symbols
9)When measuring televisions or switching power supplies, be aware that there may be pulses in the circuit that can damage the circuit. 10)Remove the batteries if the multimeter is not used for an extended period, or if stored in temperatures above 50°C. Safety symbols...
Page 5: Overview
Overview Product Functions Overview...
Page 6: Backlight / Flashlight
Backlight I Flashlight Push button to toggle the backlight on and off. Push this button for 2 seconds to toggle the flashlight on and off. The backlight/flashlight automatically turns off after 30 seconds. Auto Power Off The multimeter will automatically turn off if it is left idle for about 15 minutes. You can press any button to restart the device in the automatic shutdown mode.
Page 7: Dc/Ac Voltage Measurement
DC/AC Voltage Measurement 1. Put the black lead into the' COM ' port and the red lead into the port. 2. Switch to the' ' or ranges and put the test leads to the loaded circuit. 3. DC signal will be displayed, indicating DC voltage test. Press button to ACV test.
Page 8: Diode Measurement
Diode Measurement 1. Put the black lead into the' COM ' port and the red lead into the port. 2. Switch to the and press button 2 times. shows on the display.) 3. Touch the diode anode with the red probe, the black probe contacts the diode cathode.
Page 9: Capacitance Measurement
Capacitance Measurement 1. Put the black lead into the ’COM ‘ port and the red lead into the ' ' port . 2. Switch to the ranges and put the test leads to the circuit to be tested. Note: Before testing a capacitor in the circuit, please make sure the circuit is powered off •...
Page 10: Ncv Test
current test. (' AC ' shows on the display.) 4. Connect the test leads to the loaded circuit. Note: 1.' OL' means overload, please switch to a higher range. 2. The voltage above 250V can't be measured, otherwise, the multimeter may be damaged.
Page 11: Temperature Measurement
Temperature Measurement 1. Tum the knob to the' °C'. (The multimeter will display the ambient temperature) 2. Switching ‘°C ‘or ‘ °F ‘by button. 3. Insert the thermocouple into the instrument, the positive (red) is inserted into the input, and the negative end (black) is inserted into the COM input. 4.
Page 12: Temperature
Temperature AC Voltage DC Voltage Diode/Continuity...
Page 13: Ac Current
AC Current 1. Overload protection: mA range with F600mA/250V and 20A range with F20/250V Max input current: mA: 600mA RMS 20A: 20A RMS 2. When the current is more than 5A, the test time should be less than 10 minutes and 1 minute should be given to stop testing after such measurement.
Page 14: Resistance
Resistance Capacitance Maintenance Check the battery first, if is displayed, the battery needs to be changed. • Only use the specified fuse (600mA 1250V, 20A 1250V fast melt fuse) to avoid • electric shock or personal injury. Tum off and check that the test has been disconnected from the measured circuit •...
Page 15: Cleaning
Cleaning 1. Turn off the multimeter and remove the test leads. 2. Wipe the case with a damp cloth and clean it with mild detergent. 3. Dirt or moisture in the terminals can affect the readings. 4. If there is any abnormality, stop using the multimeter immediately. Install Batteries &...