NJTY T5 Smart Digital Multimeter User Manual

1. Introduction

The NJTY T5 Smart Digital Multimeter is a portable, high-precision measurement tool designed for both professionals and beginners. It intelligently recognizes DC voltage, AC voltage, resistance, on-off buzzer, frequency, AC and DC current, and automatically switches to the corresponding range. It also supports manual selection for diode, capacitance, and temperature measurements. Featuring a large LCD and 6000-count display, it provides accurate and clear readings. The device is certified to IEC 61010 for 600V CAT III and pollution degree 2 safety standards, ensuring reliable and safe operation.

2. Safety Information

When using this meter, users must comply with all standard safety regulations to prevent electric shocks and misuse of the instrument. Always use the provided test pens, ensuring they are intact before use.

2.1. Safety Symbols

2.2. Safety Notices

• The use of meter instruments near devices with large electromagnetic disturbances may lead to unstable readings and large errors.
• Do not use the meter if its appearance or the test pen is broken.
• Incorrect use may compromise the meter's safety functions.
• Exercise caution when working near bare conductors or buses.
• Do not use this instrument near explosive gas, vapor, or dust.
• Always use the correct input function for the desired measurement range.
• Ensure the input value does not exceed the specified limit for each range to prevent damage.
• Avoid touching unused inputs when the instrument is connected to a circuit under test.
• Be cautious of electric shock when measuring voltages exceeding 60 VDC or 30 VAC.
• When measuring with a test pen, keep your finger behind the guard ring.
• Before changing the range, ensure the test pens are disconnected from the circuit under test.
• Before measuring resistance, diode, capacitance, or performing a continuity test, ensure the circuit is powered off and all high-voltage capacitors are discharged.
• Do not measure resistance on a live circuit or perform a buzzer test on a live circuit.
• Before current measurement, check the meter's fuse.
• When performing TV repairs or measuring power conversion circuits, be aware of high-amplitude voltage pulses to avoid damaging the meter.
• Do not exceed 600V when measuring voltages.
• Do not use the instrument if its housing or any part of it is removed.

3. Product Overview

The NJTY T5 Multimeter features a compact design with a clear LCD display and intuitive controls.

3.1. Panel Schematic

1. Illumination
2. NCV sensing area
3. Buzzer & NCV indicator
4. LCD display
5. Power button
6. Data hold and NCV button
7. 10A input socket
8. COM input socket
9. V/Ω input socket
10. Diode, Capacitance and temperature switch button
11. Backlight and Illumination button

4. Setup

4.1. Battery Installation

The instrument uses two AAA 1.5V batteries (not included) as the power supply. When the low voltage symbol (battery icon) appears on the display, replace the batteries immediately to avoid incorrect readings, which could lead to electric shock or personal injury.

1. Turn off the instrument and remove all test pens from the input sockets.
2. Use a screwdriver to loosen the screws fixing the battery cover.
3. Remove the battery cover and take out the old batteries.
4. Replace with two new 1.5V AAA batteries, ensuring correct polarity.
5. Install the battery cover and tighten the screws.

4.2. Accessories

The package typically includes:

• 1 x Instruction Manual (this document)
• 1 x Pair of Test Leads (red and black)
• 1 x Temperature Probe

5. Operating Instructions

5.1. General Operation

• The "HOLD" function retains the current reading on the display. It is invalid if there is no input and recovers when input is present. Long pressing the HOLD/NCV button can activate the NCV function.
• The meter features an automatic power-off function. After approximately 10 minutes of inactivity, the meter will emit an audible prompt and then power off automatically. To disable this, press the power button and the "°C/°F" button simultaneously when turning on the device.

5.2. Backlight and Flashlight Function

The meter has a backlight and flashlight for convenient reading in dark environments:

1. Short press the backlight/illumination key to turn on the backlight. Short press again to turn it off. It will automatically turn off after 30 seconds of no operation.
2. Long press the backlight/illumination key to turn on both the flashlight and backlight simultaneously. Short press again to turn off the illumination. It will automatically turn off after 30 seconds of no operation.
3. If the backlight is already on, pressing the key for 2 seconds can also activate the flashlight. Both will turn off after 30 seconds of no operation.

5.3. ACV/DCV/Resistance/Buzzer Measurement

1. Connect the black test pen to the COM jack and the red test pen to the V/Ω jack.
2. Turn on the meter by pressing the power key.
3. Connect the test leads to the circuit under test. The meter will automatically detect and measure ACV, DCV, continuity, or resistance.
4. If the circuit resistance is not greater than approximately 50 ohms, the indicator light will turn on, and the buzzer will sound continuously (for continuity test).
5. When measuring DCV, the screen will show the polarity of the red test pen and the surrounding temperature.
6. When measuring ACV, the screen can display the frequency of the ACV.

5.4. Diode Measurement

Press the "Diode/Capacitance/Temperature" button until the diode symbol (▶|) is shown on the display. This indicates the meter is in diode measurement mode. Place the red test pen into the V/Ω socket. The forward voltage drop of the diode will be displayed directly on the LCD screen.

5.5. Capacitance Measurement

Press the "Diode/Capacitance/Temperature" button until "C" is shown on the display. This indicates the meter is in capacitance measurement mode. Place the red test pen into the V/Ω socket. The capacitance reading will be displayed directly on the LCD screen.

• Note: Measuring large capacitance values may take some time.
• Ensure correct polarity when measuring polarized capacitors to avoid damaging the meter.

5.6. Temperature Measurement

Press the "Diode/Capacitance/Temperature" button until "°C" or "°F" is shown on the display. This indicates the meter is in temperature measurement mode. Insert the temperature probe into the V/Ω and COM sockets. The temperature reading will be displayed. Press the button again to switch between Celsius (°C) and Fahrenheit (°F).

5.7. AC/DC Current Measurement

1. Connect the black test pen to the COM jack and the red test pen to the 10A jack.
2. Turn on the meter by pressing the power key.
3. Connect the test leads in series with the circuit to be measured. The current reading will be displayed.
4. Press the H/NCV button to hold the data.

5.8. NCV (Non-Contact Voltage) Detection

1. Turn on the meter by pressing the power key.
2. Press and hold the H/NCV button. The display will show "NCV" or "Live".
3. Bring the NCV sensing area (top of the meter) near an AC voltage source. The indicator light will flash, and a buzzer will sound if AC voltage is detected. The display will show the signal strength (from "-" to "----").

• Note: Voltage may still be present even if the NCV indicator does not flash, due to socket designs or insulation.
• External factors like flashlights or radar may cause false NCV indications.

5.9. Data Hold Function

To freeze the current reading on the display, short press the "HOLD" button. Press it again to release the hold and resume live measurements.

6. Maintenance

• When opening the instrument case or removing the battery cover, always remove the test pens first.
• Only use specified replacement parts for servicing the meter.
• Before opening the meter, disconnect all relevant power sources and ensure no static electricity is present to prevent damage.
• Instrument components, calibration, and maintenance should only be performed by professionals.
• Be aware of residual dangerous voltages within the instrument even after it is turned off.
• If any abnormality is observed, stop using the instrument immediately and send it for repair. Do not use it again until it has been inspected and qualified.
• If not in use for a long time, remove the batteries to prevent leakage and store the meter in a cool, dry place, away from high temperatures and humidity.

7. Troubleshooting

• No Display / Power On Failure: Check battery installation and ensure batteries are not depleted. Replace if necessary.
• Inaccurate Readings: Ensure test leads are properly connected. Verify the correct measurement function and range are selected. Check for electromagnetic interference from nearby devices.
• "OL" Displayed: Indicates an overload or out-of-range measurement. Select a higher range or ensure the measured value is within the meter's limits.
• Low Battery Indicator: If the battery symbol appears, replace the AAA batteries promptly to ensure accurate readings.
• NCV False Alarms: External factors like strong light flashes or radar signals can interfere with NCV detection. Ensure the environment is clear of such interference.
• Instrument Malfunction: If the meter exhibits any unusual behavior or appears damaged, discontinue use immediately and seek professional repair.

8. Specifications

8.1. Environmental Conditions

• Operating Conditions: 600V CAT III, Pollution grade 2
• Altitude: Less than 2000m
• Operating Temperature: 0-40°C (<80%RH)
• Storage Temperature: -10-60°C (<70%RH, with battery removed)
• Test/Calibration Ambient Temperature: 20°C ± 2°C
• Maximum Voltage (Measurement Terminal to Ground): 600V
• Conversion Speed: Approx. 3 seconds/second

9. User Tips

• For quick checks, rely on the auto-ranging feature, but for precise measurements, especially with diodes or capacitors, manually select the specific function.
• Always double-check your test lead connections before taking a measurement to prevent damage to the meter or the circuit.
• The backlight and flashlight are very useful in dimly lit areas; remember to activate them for better visibility.
• When measuring temperature, ensure the temperature probe is securely connected and in good contact with the object being measured for accurate readings.
• The NCV function is excellent for quickly identifying live wires without direct contact, enhancing safety during electrical work.

10. Warranty and Support

For detailed information regarding warranty, service, or additional support, please refer to the official product documentation. A comprehensive user manual in PDF format is available for download and can be accessed at NJTY T5 User Manual (PDF).