NJTY T21L Multifunction High Precision Digital Multimeter User Manual

1. Produto rematadoview

The NJTY T21L is a high-precision digital multimeter designed for electricians, DIY enthusiasts, and anyone requiring accurate electrical measurements. This versatile tool offers a wide range of functions, including voltage, current, resistance, capacitance, inductance, frequency, temperature, diode, and continuity testing.

As características principais inclúen:

• Pantalla HD grande: A 6000-count display provides clear, easy-to-read measurements without parallax issues.
• Medición multifuncional: Capable of measuring DC/AC Voltage, DC/AC Current, Resistance, Capacitance, Inductance, Temperature, Diode, and Circuit Continuity.
• Vol. Sen contactotagDetección de e (NCV): Detección segura do volume da CAtage without direct contact, indicated by a light and buzzer alarm.
• Secure Test Lead Jacks: Designed for smooth and tight insertion of test leads, ensuring accurate and reliable connections.
• Retroiluminación e lanterna: Equipped with a display backlight and a built-in flashlight for convenient operation in low-light environments.

Fronte view of the NJTY T21L Digital Multimeter, showcasing its large display and rotary switch.

2. Configuración e preparación

2.1 Instalación da batería

The NJTY T21L multimeter requires three (3) 1.5V AAA batteries (not included) for operation.

1. Localiza a tapa do compartimento da batería na parte traseira do multímetro.
2. Use un desaparafusador para abrir a tapa do compartimento da batería.
3. Insert three 1.5V AAA batteries, ensuring correct polarity (+ and -).
4. Coloque a tapa do compartimento da batería e fíxaa co parafuso.

Image showing the open battery compartment for installing 3 AAA batteries.

2.2 Conexión dos cables de proba

Always ensure test leads are securely connected before taking measurements.

1. Insira o negro cable de proba no COM (Common) input terminal.
2. Para a maioría das medicións (voltage, resistance, capacitance, frequency, temperature, diode, continuity, and current up to 600mA), insert the vermello cable de proba no VΩmA terminal de entrada.
3. Para medicións de corrente alta (ata 10 A), insira o vermello cable de proba no 10A terminal de entrada.

The included red and black test leads used for making electrical measurements.

The multimeter with its test leads properly connected to the input terminals.

3. Instrucións de funcionamento

3.1 Compoñentes do multímetro

Familiarize yourself with the various parts of the NJTY T21L multimeter:

This diagram identifies all key components and controls of the NJTY T21L digital multimeter.

• Lanterna: Located at the top, provides illumination for work areas.
• Área de detección NCV: Top-front area for non-contact voltage detección.
• Pantalla LED: Mostra lecturas de medición e indicadores.
• Buzzer Indicator Light: Illuminates and buzzes for NCV and continuity.
• Flashlight/Backlight Button: Activates the flashlight and display backlight.
• Gear Rotary Switch: Selects the primary measurement function.
• Resistencia/Volumentage Input Terminal (VΩmA): Para o voltage, resistance, capacitance, frequency, temperature, diode, continuity, and low current measurements.
• Common Terminal (COM): For the black test lead.
• Current Input Terminal (10A): Para medicións de alta corrente (ata 10 A).
• Data Hold Button (HOLD): Conxela a lectura actual na pantalla.
• Function Switch/Frequency Button (FUNC/Hz): Toggles between sub-functions within a rotary switch setting (e.g., AC/DC voltage, diode/continuity) or activates frequency measurement.
• Luz indicadora NCV: Illuminates during NCV detection.

3.2 Basic Measurement Procedures

Always ensure the multimeter is set to the correct function and range before connecting to a circuit. Start with a higher range if the expected value is unknown.

3.2.1 Volt CC / CAtage Measurement (V~, V=)

1. Poña o interruptor rotativo en V~ (Volumen da CA)tage) ou V= (DC Voltage) posición.
2. Conecte o cable de proba vermello ao VΩmA terminal e o test negro conducen ao COM terminal.
3. Conecte as sondas de proba en paralelo a través do compoñente ou circuíto que se vai medir.
4. Le o voltago valor da pantalla.

3.2.2 Medición da resistencia (Ω)

1. Poña o interruptor rotativo en Ω Posición (de resistencia).
2. Conecte o cable de proba vermello ao VΩmA terminal e o test negro conducen ao COM terminal.
3. Asegúrese de que o circuíto estea desenergizado antes de medir a resistencia.
4. Conecte as sondas de proba a través do compoñente.
5. Lea o valor de resistencia na pantalla.

3.2.3 Continuity Test and Diode Test

1. Poña o interruptor rotativo en Díodo/Continuidade posición.
2. Conecte o cable de proba vermello ao VΩmA terminal e o test negro conducen ao COM terminal.
3. Preme o FUNC/Hz button to toggle between Diode Test and Continuity Test.
4. For Continuity: Touch the probes to the ends of the circuit. A continuous beep indicates continuity.
5. For Diode: Connect the red probe to the anode and the black probe to the cathode. The display shows the forward voltagcaída de e. Inverta as sondas; un circuíto aberto (OL) indica un bo díodo.

3.2.4 Medición de capacitancia (F)

1. Poña o interruptor rotativo en Capacitancia posición.
2. Conecte o cable de proba vermello ao VΩmA terminal e o test negro conducen ao COM terminal.
3. Asegúrese de que o condensador estea completamente descargado antes da medición.
4. Conecte as sondas de proba aos terminais do condensador.
5. Lea o valor da capacidade na pantalla.

3.2.5 DC/AC Current Measurement (µA, mA, A)

Atención: Always connect the multimeter in series with the circuit. Never connect it in parallel across a voltage source when measuring current, as this can damage the meter and the circuit.

1. Set the rotary switch to the appropriate current range (µA, mA, or A).
2. Para correntes de ata 600 mA, conecte o cable de proba vermello ao VΩmA terminal. For currents up to 10A, connect the red test lead to the 10A terminal. The black test lead always goes to COM.
3. Open the circuit where current is to be measured and insert the multimeter in series.
4. Lea o valor actual na pantalla.

3.2.6 Vol. sen contactotagDetección e (NCV).

1. Poña o interruptor rotativo en NCV posición.
2. Move the NCV sensing area (top of the meter) close to the AC voltage fonte.
3. The NCV indicator light will illuminate, and the buzzer will sound, with increasing frequency as the meter gets closer to the voltage fonte.

3.2.7 Medición da temperatura (°C/°F)

1. Poña o interruptor rotativo en ° C / ° F posición.
2. Connect the temperature probe (if included) to the VΩmA e COM terminals, observing polarity.
3. Place the tip of the temperature probe on the object or area whose temperature is to be measured.
4. Read the temperature value on the display. Press FUNC/Hz para cambiar entre Celsius e Fahrenheit.

3.3 Funcións especiais

• Retención de datos: Preme o ATENCIÓN button to freeze the current reading on the display. Press it again to release.
• Retroiluminación/Lanterna: Preme o Flashlight/Backlight Button to turn on the display backlight. Press and hold to activate the top flashlight. Press again to turn off.
• Apagado automático: O multímetro apagarase automaticamente despois dun período de inactividade para aforrar batería.

4. Mantemento

4.1 Limpeza

Para limpar o multímetro, limpe a carcasa con sprayamp un pano e un deterxente suave. Non empregue abrasivos nin disolventes. Asegúrese de que o dispositivo estea apagado e desconectado de calquera circuíto antes de limpalo.

4.2 Substitución da batería

When the low battery indicator appears on the display, replace the batteries promptly to ensure accurate readings. Follow the battery installation steps in Section 2.1.

4.3 Precaucións de seguridade

• Always turn off the multimeter and disconnect test leads before opening the case for battery replacement or fuse inspection.
• Do not operate the meter if the battery cover is not properly closed.
• Non empregue o medidor se parece estar danado ou se o illamento dos cables de proba está comprometido.

5 Solución de problemas

• Sen visualización: Comprobe se as baterías están instaladas correctamente e teñen a carga suficiente. Substitúaas se é necesario.
• Lecturas incorrectas: Ensure the rotary switch is set to the correct function and range. Check test lead connections. Verify the circuit is properly connected.
• "OL" na pantalla: This usually indicates an over-range condition (measurement exceeds the selected range) or an open circuit (e.g., when measuring resistance of an open circuit).
• Indicador de batería baixa: Replace the batteries as soon as possible to maintain accuracy.

6. Especificacións

The following table details the technical specifications and measurement ranges for the NJTY T21L Digital Multimeter:

This table details the measurement ranges and accuracies for all functions of the NJTY T21L multimeter.

7. Garantía e soporte

Specific warranty information for the NJTY T21L Digital Multimeter is not provided in the product details. For warranty claims, technical support, or service inquiries, please contact your retailer or the manufacturer, EVTSCAN, directly. Retain your proof of purchase for any warranty-related requests.