1. Introduction
Thank you for choosing the MASTFUYI Mini Digital Multimeter (Models FY106A/FY106B). This device is a versatile, accurate, and reliable electronic measurement tool designed for both professional electricians and DIY enthusiasts. It supports a wide range of measurement functions including voltage, current, resistance, frequency, capacitance, continuity, diode testing, Non-Contact Voltage (NCV) detection, and live wire checking.
Its compact and portable design, coupled with a large, clear display, makes it convenient for use in various environments. The multimeter incorporates advanced measurement technology to ensure high-precision results and includes built-in safety protection mechanisms for user and equipment safety.
2. Safety Information
Please read and understand all safety instructions before operating the multimeter. Failure to follow these instructions may result in electric shock, fire, or damage to the device.
- Always ensure the multimeter is in good working condition before use.
- Do not apply voltage or current that exceeds the maximum rated values specified in the specifications.
- Use caution when working with voltages above 30V AC RMS, 42V peak, or 60V DC. These voltages pose a shock hazard.
- Ensure the test leads are properly connected and in good condition. Do not use damaged test leads.
- Replace the battery promptly when the low battery indicator appears to ensure accurate readings.
- The device features a ceramic safety tube for enhanced protection. Do not bypass or replace it with an incorrect type.
3. Product Overview
The MASTFUYI Mini Digital Multimeter is designed for ease of use and clear readability. Below are the key components and controls for both FY106A and FY106B models.
3.1. Multimeter Components (FY106B shown)
- VA LCD (FY106B) / LCD (FY106A): Digital display for measurement readings.
- Function Switching: Press to cycle through different measurement functions. Long press for Torch (flashlight).
- Data Locking / Backlight (FY106A long press): Press to hold the current reading on the display. Long press for backlight on FY106A.
- ON/OFF: Power button.
- NCV / LIVE: Button to switch between Non-Contact Voltage and Live Wire Check modes.
- COM Jack: Common input jack for test leads (black).
- Current Jack: Input jack for current measurements (red).
- Input Jack: Input jack for voltage, resistance, frequency, capacitance, continuity, and diode measurements (red).
- NCV Probe: Sensor for non-contact voltage detection.
- Flashlight: Illuminates the work area.
3.2. Icon Legend
4. Setup
4.1. Battery Installation
The multimeter requires 2 AAA batteries (not included). To install or replace batteries:
- Ensure the multimeter is powered off.
- Locate the battery compartment on the back of the device.
- Open the battery compartment cover.
- Insert two AAA batteries, observing the correct polarity (+ and -).
- Close the battery compartment cover securely.
5. Operating Modes
The multimeter features both automatic and manual measurement modes, providing flexibility for various tasks.
5.1. Automatic Measurement Mode
In automatic mode, the multimeter intelligently identifies the type of measurement (voltage, resistance, continuity) and selects the appropriate range. This simplifies operation for quick checks.
5.2. Manual Switching
For specific measurements or to override automatic detection, press the 'SEL' (Function Switching) button to cycle through available functions. Long press the 'SEL' button to activate the flashlight.
5.3. Specific Measurement Functions
Refer to the video demonstration for a visual guide on using these functions.
Video demonstrating the unboxing and various functions of the FY106B Multimeter, including auto mode, DC/AC voltage, frequency, resistance, continuity, diode, capacitance, DC/AC current, flashlight, data hold, NCV, and zero live line detection.
Voltage Measurement (DC/AC)
- Connect the red test lead to the 'Input Jack' and the black test lead to the 'COM Jack'.
- Select DC Voltage or AC Voltage mode using the 'SEL' button if not in auto mode.
- Connect the test leads across the component or circuit to measure voltage.
Current Measurement (DC/AC)
- WARNING: Ensure the circuit is de-energized before connecting the multimeter in series for current measurement.
- Connect the red test lead to the 'Current Jack' and the black test lead to the 'COM Jack'.
- Select DC Current or AC Current mode.
- Break the circuit and connect the multimeter in series with the load.
Resistance Measurement
- Connect the red test lead to the 'Input Jack' and the black test lead to the 'COM Jack'.
- Select Resistance mode.
- Connect the test leads across the component to measure its resistance. Ensure the component is isolated from power.
Capacitance Measurement (FY106B only)
- Connect the red test lead to the 'Input Jack' and the black test lead to the 'COM Jack'.
- Select Capacitance mode.
- Connect the test leads across the capacitor. Ensure the capacitor is discharged before testing.
Frequency Measurement
- Connect the red test lead to the 'Input Jack' and the black test lead to the 'COM Jack'.
- Select Frequency mode.
- Connect the test leads to the signal source.
Continuity Test
- Connect the red test lead to the 'Input Jack' and the black test lead to the 'COM Jack'.
- Select Continuity mode.
- Touch the test leads to the ends of the circuit or component. A beep indicates continuity.
Diode Test (FY106B only)
- Connect the red test lead to the 'Input Jack' and the black test lead to the 'COM Jack'.
- Select Diode mode.
- Connect the test leads across the diode. The display will show the forward voltage drop.
Non-Contact Voltage (NCV) Detection
- Press the 'NCV/LIVE' button to enter NCV mode.
- Move the NCV probe (top of the multimeter) close to the conductor. The device will beep and display increasing bars as it detects AC voltage.
Live Wire Check
- Press the 'NCV/LIVE' button to enter Live Wire Check mode.
- Insert the red test lead into the live terminal of an AC outlet or touch it to a live wire. The device will indicate if the wire is live.
Data Hold
- During any measurement, press the 'HOLD' button to freeze the current reading on the display.
- Press 'HOLD' again to release the reading.
Flashlight
- Long press the 'SEL' (Function Switching) button to turn the flashlight on or off.
6. Specifications
Below are the detailed specifications for the FY106A and FY106B models:
| Feature | FY106A | FY106B |
|---|---|---|
| Screen display | LCD | VA LCD |
| Operating method | Automatic + manual | Automatic + manual |
| AC Current | 100mA~4A (±3.5%+5) | 100mA~4A (±3.5%+5) |
| DC Current | 100mA~4A (±2.5%+5) | 100mA~4A (±2.5%+5) |
| AC Voltage | 1V~600V (±1.2%+3) | 1V~600V (±1.2%+3) |
| DC Voltage | 1V~600V (±1.2%+3) | 1V~600V (±1.2%+3) |
| Resistances | 50Ω~40MΩ (±1%+2) | 50Ω~40MΩ (±1%+2) |
| Frequency | 9~40KHz | 9~40KHz |
| Continuity | √ | √ |
| Capacitance | X | 40000μF |
| Diode | X | √ |
| NCV | √ | √ |
| Live wire check | √ | √ |
| Product size | 117x56x25mm | 117x56x26mm |
| Weight | Approximately 92g (without battery) | Approximately 92g (without battery) |
| General functions | Flashlight, low voltage prompt, automatic shutdown, data saving, ceramic safety tube | |
Certifications: CE, FCC, ROHS
7. Maintenance
7.1. Cleaning
To clean the multimeter, wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents. Ensure the device is powered off and disconnected from any circuits before cleaning.
7.2. Battery Replacement
When the low battery indicator appears on the display, replace the batteries as described in the 'Battery Installation' section (4.1). Always use new AAA batteries of the correct type.
8. Troubleshooting
- No display/Power issues: Check if the batteries are correctly installed and have sufficient charge. Replace batteries if necessary.
- Incorrect readings: Ensure the correct measurement function is selected and test leads are properly connected. Verify that the component being tested is isolated from power if required.
- No continuity beep: Check if the circuit is open or if the test leads are faulty.
- NCV not detecting: Ensure the NCV probe is close enough to the AC voltage source.
9. User Tips
- For capacitance measurements, especially with the FY106B model, ensure the capacitor is fully discharged before connecting the multimeter to avoid damage and ensure accurate readings. The FY106B is capable of measuring up to 40000μF.
- Utilize the 'HOLD' function when taking measurements in hard-to-reach areas to easily record the reading after removing the probes.
- The automatic mode is excellent for general checks, but for precise or specific tests, manually select the desired function.
10. Warranty and Support
For detailed warranty information and further technical support, please refer to the complete user manual PDF provided with your product. The PDF manual contains additional language options and in-depth diagrams.
You can access the full user manual (PDF) here.
