1. Introduction
The WinAPEX ET8138 is a compact, 3 5/6 digit, pocket-sized True RMS intelligent scanning digital multimeter. It features a large 4.7-inch integrated color LCD touch screen with a triple display: main display, secondary display, and an analog bar. This instrument is designed for automatic recognition and measurement of AC/DC voltage and resistance, providing stable performance, high accuracy, and reliability. It is an ideal tool for laboratories, factories, radio enthusiasts, and household electrical testing.
Image 1.1: WinAPEX ET8138 Digital Multimeter. This image shows the front view of the multimeter with its large touch screen display, indicating various measurement modes and readings. A robotic hand is shown interacting with the screen, highlighting its touch functionality.
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 instrument.
- Voltage Limits: When measuring voltage, do not input a voltage exceeding the effective value of DC 1000V or AC 750V. Exceeding these limits can cause damage to the device and pose a safety risk.
- Safe Voltage Range: Voltages below 36V in the current range are generally considered safe. Exercise caution with higher voltages.
- Test Lead Handling: When changing functions or measurement ranges, ensure the test leads are removed from the test point to prevent accidental short circuits or incorrect readings.
- Battery Safety: Ensure correct battery polarity when installing. Do not mix old and new batteries or different types of batteries. Remove batteries if the instrument is not used for an extended period.
- Environmental Conditions: Do not operate the multimeter in wet environments or in the presence of explosive gases or dust.
- Inspection: Before each use, inspect the multimeter and test leads for any signs of damage. Do not use if damaged.
3. Product Overview
The WinAPEX ET8138 multimeter is designed for ease of use and comprehensive electrical testing. Key features include:
- Touch Screen Display: 4.7-inch integrated color large screen for clear readings.
- Automatic Measurement: Automatically recognizes and measures AC/DC voltage and resistance.
- True RMS: Provides accurate measurements for non-sinusoidal waveforms.
- NCV (Non-Contact Voltage) Detection: For detecting live wires without direct contact.
- Live Wire Judgment: Identifies live electrical lines.
- Flashlight: Integrated flashlight for working in dimly lit areas.
- Data Hold: Freezes the current reading on the display.
- Automatic Power Off (APO): Conserves battery life.
Image 3.1: Multimeter Components. This diagram labels the key parts of the WinAPEX ET8138, including the LCD display, hang rope hole, flashlight lighting, fire line test, capacitance, NCV, on-off key, hold button, function switch, data hold, screen backlight, and battery cover.
4. Setup
4.1 Battery Installation
- Locate the battery cover on the back of the multimeter (refer to Image 3.1).
- Use a suitable screwdriver to open the battery cover.
- Insert two AAA 1.5V batteries (not included) into the battery compartment, ensuring correct polarity (+ and -).
- Replace the battery cover and secure it with the screw.
4.2 Connecting Test Leads
The multimeter comes with a pair of test leads. Insert the red test lead into the "VΩmA" input jack and the black test lead into the "COM" input jack for most measurements.
5. Operating Instructions
5.1 Power On/Off
Press and hold the power button (labeled "POWER" or with a power symbol) for approximately 3 seconds to turn the multimeter on or off.
5.2 Automatic Measurement Mode
Upon powering on, the ET8138 automatically enters intelligent scanning mode. It will automatically recognize and measure AC/DC voltage and resistance based on the input. This eliminates the need to manually select functions for basic measurements.
5.3 Manual Function Selection
While the multimeter primarily operates in automatic mode, you can manually switch to measure specific parameters such as DC voltage, AC voltage, capacitance, electric field, live wire judgment, diode, and on/off (continuity) test. Use the function conversion button (often labeled with symbols like "Hz", "V", "Ω", "Capacitance", "Diode", "Continuity") to cycle through these modes.
5.4 Specific Functions
- NCV (Non-Contact Voltage): Press the "Live NCV" button to activate NCV mode. Bring the top of the multimeter close to a live wire or electrical outlet. The display will indicate the presence of AC voltage, and an audible alarm may sound.
- Live Wire Judgment: In Live Wire mode (selected via function button or "Live NCV" button), touch the red test lead to the suspected live wire. The display will indicate "LIVE" and provide a reading if a live wire is detected.
- Data Hold: Press the "HOLD" button to freeze the current reading on the display. Press it again to release.
- Flashlight: The flashlight can be activated by a dedicated button or a long press of a specific function button (refer to Image 3.1 for exact button).
6. Maintenance
6.1 Cleaning
Wipe the multimeter casing with a damp cloth and mild detergent. Do not use abrasive cleaners or solvents. Ensure the device is powered off and disconnected from any circuits before cleaning.
6.2 Battery Replacement
When the low battery indicator appears on the display, replace the batteries as described in Section 4.1. Always use two new AAA 1.5V batteries.
6.3 Storage
If the multimeter will not be used for an extended period, remove the batteries to prevent leakage. Store the instrument in a cool, dry place, away from direct sunlight and extreme temperatures.
7. Troubleshooting
- No Display:
- Check if the multimeter is powered on.
- Verify battery installation and ensure batteries are not depleted. Replace if necessary.
- Incorrect Readings:
- Ensure test leads are correctly inserted into the appropriate jacks.
- Verify that the correct measurement function is selected (if not in auto mode).
- Check for damaged test leads or poor connections.
- Ensure the voltage or current being measured is within the instrument's specified range.
- Multimeter Not Responding:
- Try turning the device off and on again.
- Replace batteries.
8. Specifications
The following table outlines the technical specifications of the WinAPEX ET8138 Digital Multimeter:
| Parameter | Specification |
|---|---|
| Display Type | Digital display, 3 5/6 digits, 6000 counts, 4.7-inch color LCD |
| AC Voltage Range | Up to 750V |
| DC Voltage Range | Up to 1000V |
| Measuring Resistance Range | Up to 6 MΩ |
| Measuring Capacitance Range | Up to 60 mF |
| True RMS | Yes |
| NCV (Non-Contact Voltage) | Yes |
| Live Wire Detection | Yes |
| Power Supply | 2 x AAA 1.5V batteries (not included) |
| Dimensions | 133mm x 67mm x 12mm (approx. 5.24 x 2.64 x 0.47 inches) |
| Item Weight | 50 Grams (approx. 1.76 ounces) |
| Certification | CE |
Image 8.1: Multimeter Dimensions. This image illustrates the physical dimensions of the WinAPEX ET8138, showing its length (133mm) and width (67mm), emphasizing its compact, portable design.
9. Warranty and Support
This product is manufactured by MDWXDOFP. For warranty information, technical support, or service inquiries, please contact the retailer or manufacturer directly. Please retain your proof of purchase for any warranty claims.
