BTMETER BT-41B TRMS Digital Multimeter

1. Overview

The BTMETER BT-41B is a 6000-count True RMS auto-ranging digital multimeter designed for accurate and reliable electrical measurements. It features a large backlit LCD display for clear readings and a robust design suitable for various applications. This instrument is ideal for troubleshooting electrical problems in household, hobbyist, and professional settings.

BTMETER BT-41B Digital Multimeter with function icons for AC/DC Voltage, Current, Temperature, Resistance, Continuity, Capacitance, Diode, and Frequency.

2. Safety Information

Always observe basic safety precautions when using this multimeter to avoid electric shock or personal injury. Read and understand all safety information before use.

• Ensure the correct function and range are selected for the measurement.
• Do not exceed the maximum input values for any range.
• Never use the meter on circuits with voltages exceeding 600V.
• Always disconnect the test leads from the circuit before changing functions or ranges.
• Inspect test leads for damage before each use.
• Do not operate the meter if it appears damaged or is not operating properly.
• Use caution when working with voltages above 30V AC RMS, 42V peak, or 60V DC, as they pose a shock hazard.

3. Product Features

• True RMS Measurement: Provides accurate readings for non-sinusoidal waveforms.
• Auto-Ranging: Automatically selects the appropriate measurement range.
• 6000 Counts Display: High-resolution digital display.
• Non-Contact AC Voltage (NCV) Detection: Enhances safety by detecting live wires without physical contact.
• Data Hold: Freezes the displayed reading for easy recording.
• MAX/MIN Hold: Records maximum and minimum values during a measurement session.
• Backlight: Illuminates the display for use in dimly lit environments.
• Auto Power Off: Conserves battery life by automatically shutting down after 15 minutes of inactivity.
• Temperature Measurement: Includes a temperature probe for Celsius and Fahrenheit readings.
• Diode Test & Continuity Buzzer: For checking diodes and circuit continuity.

4. Package Contents

• BTMETER BT-41B Digital Multimeter (x1)
• English User Manual (x1)
• Test Leads (x1 set)
• Temperature Probe (x1)

BTMETER BT-41B Multimeter with included test leads and temperature probe.

5. Setup

5.1 Battery Installation

The BT-41B multimeter requires 2 x 1.5V AAA (R03P) batteries. Ensure the meter is OFF before installing or replacing batteries. Open the battery compartment cover on the back of the meter, insert the batteries observing correct polarity, and then close the cover securely.

5.2 Connecting Test Leads

For most measurements, insert the black test lead into the "COM" (Common) jack and the red test lead into the "VΩmA" jack. For current measurements exceeding 200mA, connect the red test lead to the "A" jack.

Close-up of multimeter test leads.

6. Operating Instructions

This section provides detailed instructions for using the BTMETER BT-41B Digital Multimeter for various measurements. Refer to the panel diagram below for button and knob locations.

BTMETER BT-41B Multimeter Panel Introduction with labeled controls.

6.1 Power On/Off

Turn the rotary switch from "OFF" to any desired function to power on the meter. To power off, turn the rotary switch back to "OFF". The meter will automatically shut down after 15 minutes of inactivity to save battery.

6.2 DC Voltage Test

1. Insert the black test lead into the "COM" jack and the red test lead into the "VΩmA" red jack.
2. Turn the rotary switch to the "V=" position.
3. Touch the probe tips to the test points of the DC voltage source.
4. Read the voltage value on the LCD screen.

6.3 AC Voltage Test

1. Insert the black test lead into the "COM" jack and the red test lead into the "VΩmA" red jack.
2. Turn the rotary switch to the "V~" position.
3. Press and hold the "SELECT" button to select the AC file.
4. Touch the probe tips to the test points of the AC voltage source.
5. Read the voltage value on the LCD screen.

6.4 DC Current Test

1. Insert the black test lead into the "COM" jack.
2. For currents up to 600mA, insert the red test lead into the "VΩmA" jack. For currents up to 10A, insert the red test lead into the "A" jack.
3. Turn the rotary switch to the appropriate "mA=" or "A=" position.
4. Connect the test leads in series with the circuit.
5. Read the current value on the LCD screen.
6. Note: When measuring current greater than 200mA, use the "A" jack. The instrument defaults to DC gear; press "SELECT" to switch to AC if needed.

6.5 AC Current Test

1. Insert the black test lead into the "COM" jack.
2. For currents up to 600mA, insert the red test lead into the "VΩmA" jack. For currents up to 10A, insert the red test lead into the "A" jack.
3. Turn the rotary switch to the appropriate "mA~" or "A~" position.
4. Press the "SELECT" button to select the AC file.
5. Connect the test leads in series with the circuit.
6. Read the current value on the LCD screen.
7. Note: The instrument defaults to DC gear; you need to reselect AC when changing the range.

6.6 Resistance Test

1. Insert the black test lead into the "COM" jack and the red test lead into the "VΩmA" red jack.
2. Turn the rotary switch to the "Ω" position.
3. Touch the probe tips to both ends of the resistance being measured.
4. Read the resistance value on the LCD screen.

6.7 Capacitance Test

1. Insert the black test lead into the "COM" jack and the red test lead into the "VΩmA" red jack.
2. Turn the rotary switch to the "Capacitance" position.
3. Press and hold the "SELECT" key to select capacitance measurement.
4. Touch the probe tips to the terminals of the capacitor.
5. Read the capacitance value on the LCD screen.

6.8 Temperature Measurement

1. Insert the black test lead of the sensor to the "COM" jack and the red test lead of the sensor to the "°C or °F" jack.
2. Set the rotary switch to the "°C/°F" position.
3. Place the sensor probe in the temperature field to be measured.
4. Press and hold the "SELECT" button to select Celsius or Fahrenheit.
5. Read the temperature value on the LCD screen.

6.9 LED Test (Diode Test)

1. Insert the black test lead into the "COM" jack and the red test lead into the "VΩmA" red jack.
2. Turn the rotary switch to the "Diode" position.
3. Connect the black test lead to the negative pole of the LED or zener tube, and connect the red test lead to the positive pole.
4. The LCD screen will display the LED forward voltage drop value or the stabilized voltage value of the zener tube.

6.10 Non-Contact AC Voltage (NCV)

1. Turn the rotary switch to the "NCV" position.
2. Move the top of the meter close to the AC voltage source.
3. If AC voltage is detected (above 90V), the NCV indicator light will illuminate (red and green alternating), and the buzzer will beep.

Multimeter demonstrating Non-Contact AC Voltage (NCV) measurement.

6.11 Data Hold (HOLD)

1. During any measurement, press the "HOLD" key to lock the current screen display value.
2. The "DH" symbol will be displayed on the LCD screen.
3. Press "HOLD" again to cancel.

6.12 MAX/MIN Button

1. During a measurement, press the "MAX/MIN" button.
2. The meter will display the "MAX" symbol, indicating it has started recording the maximum value.
3. Press again to display the "MIN" symbol, indicating it has started recording the minimum value.
4. Press a third time to exit MAX/MIN mode.

6.13 Backlight

Long press the "SELECT" key for more than 2 seconds to turn the backlight on. Long press it again for 2 seconds to turn it off.

6.14 Frequency/Duty Cycle (Hz/DUTY)

1. In AC voltage or current measurement state, press the "Hz/DUTY" key.
2. This will cycle through the cyclic measurement of ACV → Hz → DUTY.

6.15 Relative Value Measurement

1. Perform an initial measurement (e.g., voltage).
2. Long press the "SELECT" key for more than 2 seconds.
3. The meter will enter relative value measurement mode. It records the initial parameter value and clears the display.
4. Subsequent measurements will show the difference relative to the initial recorded value.

6.16 Product Demonstration Video

Video demonstrating various measurement functions of the BTMETER BT-41B Multimeter, including setup, voltage, current, resistance, capacitance, temperature, LED test, and special functions like data hold and relative value.

7. Specifications

BTMETER BT-41B Multimeter product dimensions and key features.

8. Maintenance

8.1 Cleaning

Wipe the meter with a soft, dry cloth. Do not use abrasives or solvents. If the meter gets wet, dry it thoroughly before use.

8.2 Battery Replacement

When the battery indicator appears on the LCD, replace the batteries immediately. Ensure the meter is OFF and disconnect all test leads before opening the battery compartment.

8.3 Fuse Replacement

If the current measurement function stops working, the fuse may be blown. Ensure the meter is OFF and disconnect all test leads. Open the back cover to access and replace the fuse with one of the correct rating (e.g., MAX 10A FUSE for A jack, MAX 800mA FUSE for VΩmA jack).

9. Troubleshooting

• No Display/Faint Display: Check battery level and replace if necessary. Ensure the rotary switch is not in the "OFF" position.
• "OL" (Overload) Display: The measured value exceeds the selected range. Switch to a higher range or ensure the input is within the meter's capabilities.
• No Reading in Current Mode: Check if the test leads are connected to the correct jacks (A or mA) and if the fuse is intact.
• Inaccurate Readings: Ensure test leads are properly connected and making good contact. Verify the correct function and range are selected.
• NCV Not Working: Ensure the meter is in NCV mode and close enough to the AC voltage source.

10. User Tips

• The auto-ranging feature is very convenient for quick measurements, but always double-check the displayed units.
• When measuring current, always connect the meter in series with the load. For voltage, connect in parallel.
• The backlight is useful in low-light conditions; remember to long-press the SELECT button to activate/deactivate it.
• For temperature measurements, ensure the sensor is properly connected and immersed in the substance or placed on the surface you wish to measure.
• The NCV function is a great safety feature for quickly checking live wires before touching them.
• Always start with the highest range when measuring an unknown value to prevent overloading the meter.

11. Warranty and Support

This product comes with a 1-year warranty from the date of purchase. For technical support or warranty claims, please contact the seller or manufacturer directly. Keep your purchase receipt as proof of purchase.