Introduction
The NJTY T02 is a non-contact AC voltage detector pen designed for quick and safe detection of AC voltage in electrical circuits, outlets, and wires. It features adjustable sensitivity, visual and audible alarms, a flashlight, and a laser indicator for enhanced usability in various environments. This manual provides essential information for the safe and effective operation of your device.
Safety Information
- Always exercise caution when working with electricity.
- Do not use the device if it appears damaged or is not functioning correctly.
- This device is designed for AC voltage detection only. Do not use it to test DC voltage.
- The laser indicator is for pointing purposes only; it does not extend the detection range of the non-contact voltage feature.
- Ensure batteries are correctly installed before use.
- Adhere to the safety rating: CAT.Ⅲ 1000V CAT.Ⅳ600V.
Product Overview
Familiarize yourself with the components of your NJTY T02 Non-Contact AC Voltage Detector Pen:
Figure 1: Labeled diagram of the NJTY T02 AC Voltage Detector Pen, showing the Battery Compartment, Portable Hook, Flashlight/Red Light Control, Sensitivity Adjustment (H/L), Power Button, Alarm Indicator, Buzzer, LED Light, Red Light, and NCV Probe.
- Battery Compartment: Located at the top, for inserting AAA batteries.
- Portable Hook: For convenient carrying.
- Flashlight/Red Light Control: Button to activate the flashlight and laser indicator.
- Sensitivity Adjustment (H/L): Button to switch between high (AC12-1000V) and low (AC48-1000V) sensitivity modes.
- Power Button: To turn the device on or off.
- Alarm Indicator: LEDs that light up to indicate voltage presence and strength.
- Buzzer: Emits audible alerts.
- LED Light: White LED for illumination (flashlight).
- Red Light: Laser indicator.
- NCV Probe: The tip used for non-contact voltage detection.
Specifications
| Feature | Description |
|---|---|
| Brand Name | NJTY |
| Model Number | T02 |
| Certification | CE |
| Origin | Mainland China |
| DIY Supplies | Electrical |
| Dimensions | 165*2.5*2.5mm |
| Power Supply | Battery (2x1.5V AAA Batteries, not included) |
| Display Type | Analog Only |
| AC Voltage Detection Range | High Sensitivity: AC12-1000V; Low Sensitivity: AC48-1000V |
| Sensitivity Adjustment Mode | High and low sensitivity mode |
| Zero Line & Fire Line Judgment | Backlight color change: Yellow (Zero Line); Red (Fire Line) |
| Signal Strength Display | Yellow (Weak signal indicator); Red (Strong signal indicator) |
| Signal Strength Indicator | Weak signal: slow buzzer, yellow light; Strong signal: rapid buzzer, red light |
| Alarm Method | Sound And Light Alarm |
| Probe Shape | Prolate shape |
| Infrared Pointing Light | Yes |
| Flashlight | Yes |
| Safety Rating | CAT.Ⅲ 1000V CAT.Ⅳ600V |
Setup
Battery Installation
- Unscrew the battery compartment cap at the top of the pen.
- Insert two 1.5V AAA batteries, ensuring correct polarity (+/-).
- Screw the battery compartment cap back on securely.
Figure 2: The NJTY T02 tester pen with its battery compartment open, showing two AAA batteries being inserted.
Operating Instructions
Power On/Off
- Press the Power Button (marked with a circle and vertical line) to turn the device on. The indicator lights will briefly flash.
- Press and hold the Power Button again to turn the device off.
Sensitivity Adjustment
- Press the H/L button to toggle between High Sensitivity (AC12-1000V) and Low Sensitivity (AC48-1000V) modes.
- Use High Sensitivity for detecting lower voltages or for detecting voltage through insulation.
- Use Low Sensitivity for detecting higher voltages or for more precise localization of voltage sources.
AC Voltage Detection
- Turn on the device and select the desired sensitivity mode.
- Bring the NCV Probe (tip of the pen) close to the object you wish to test (e.g., wire, outlet, circuit breaker).
- If AC voltage is detected, the Alarm Indicator LEDs will light up, and the Buzzer will sound.
- The intensity of the light and the frequency of the beep indicate the signal strength: a weak signal results in a slow beep and yellow light, while a strong signal results in a rapid beep and red light.
Figure 3: Voltage Sensing Demo illustrating the different responses of the detector: no voltage (no lights, no beeps), low voltage (bright yellow light, slow beep), and high voltage (red light, rapid beep).
Video 1: Product demonstration showing unboxing, battery installation, and voltage detection in action.
Zero Line and Fire Line Judgment
- When testing an AC outlet or wire, the backlight color of the detector will change to indicate the line type.
- A yellow backlight indicates the Zero Line.
- A red backlight indicates the Fire Line.
Flashlight and Laser Indicator
- Press the Flashlight/Red Light Control button to activate the white LED flashlight for illumination in dark areas.
- Press the button again to activate the red laser indicator for pointing.
- Press a third time to activate both the flashlight and laser.
- Press a fourth time to turn both off.
Figure 4: The three light states of the detector: LED Light (flashlight), Red Light (laser), and both LED Light & Red Light active simultaneously.
Maintenance
- Keep the device clean and dry. Wipe with a soft, damp cloth if necessary. Do not use abrasive cleaners or solvents.
- Remove batteries if the device will not be used for an extended period to prevent leakage.
- Store the device in a cool, dry place, away from direct sunlight and extreme temperatures.
- Do not attempt to open or modify the device, as this will void the warranty and may pose a safety risk.
Troubleshooting
- Device does not turn on: Check if the batteries are installed correctly and are not depleted. Replace batteries if necessary.
- No detection when voltage is present: Ensure the device is turned on and the NCV probe is close enough to the voltage source. Try switching to High Sensitivity mode.
- False positives/detection in unexpected areas: Switch to Low Sensitivity mode for more precise detection. Ensure there are no other strong electrical fields nearby that could interfere.
- Is the device suitable for DC voltage? No, the NJTY T02 is specifically designed for AC voltage detection (12-1000V AC) and should not be used for DC circuits.
- Can the laser detect voltage from a distance? No, the laser indicator is for pointing only. The non-contact voltage detection feature relies on proximity to the AC source.
User Tips
- Many users find this tool very convenient for quickly identifying live wires and distinguishing between phase (live) and neutral (zero) lines, making electrical work safer and more efficient.
- The compact size and portable hook make it easy to carry in a pocket or tool belt, ensuring it's always available when needed.
- Utilize the built-in flashlight when working in dimly lit areas to improve visibility and safety.
Warranty and Support
For warranty information or technical support, please refer to the seller's policies or contact the point of purchase. Keep your proof of purchase for any warranty claims.
