Extech EX820A 1000A True RMS AC Clamp Medidor com termômetro infravermelho

1. Introdução

The Extech EX820A is a professional 1000A True RMS AC Clamp Meter equipped with a built-in non-contact infrared thermometer. This device is designed for accurate electrical measurements and temperature monitoring in various applications, including electrical installations, motors, and other electrical devices. It features a large 6000 count backlit LCD display for clear readings and an ergonomically designed double-molded housing for comfortable, one-handed operation. The 43 mm (1.7 inch) jaw opening accommodates conductors up to 750 MCM or two 500 MCM cables. This meter is rated CAT IV-600 V for enhanced safety.

Informações de segurança: Always adhere to local and national safety codes. Use appropriate personal protective equipment. Do not attempt to measure voltages or currents exceeding the meter's specified limits. Ensure the meter is in good working condition before use. Refer to the safety section in the full manual for detailed precautions.

Figure 1: Extech EX820A Clamp Medidor acimaview

2. Recursos do Produto

• Medição True RMS: Fornece leituras precisas para formas de onda não sinusoidais.
• 1000A AC Current Measurement: High current capacity for demanding applications.
• Built-in IR Thermometer: Non-contact temperature measurement with laser pointer for identifying hot spots.
• LoZ (Low Impedance) Mode: Impede leituras falsas causadas por volumes fantasmas.tage.
• Filtro passa-baixo (LPF): Ensures accurate measurements in electrically noisy environments.
• Inrush Current Measurement: Captures motor start-up current.
• CAT IV-600V Safety Rating: High safety standard for industrial environments.
• 6000 Count Backlit LCD Display: Large, easy-to-read display with illumination for dim lighting conditions.
• Abertura da mandíbula: 43 mm (1.7 inches) for large conductors.
• Funções do multímetro: Inclui AC/DC Voltage, Resistance, Capacitance, Frequency, Diode, and Continuity.

Figure 2: Display with LoZ and LPF Indicators

3. Configuração

3.1 Desembalagem e Inspeção

Carefully unpack the meter and its accessories. Verify that all items listed in the 'Included Components' section are present and undamaged. If any item is missing or damaged, contact your supplier immediately.

3.2 Instalação da bateria

The EX820A requires one (1) 9V battery (included). To install or replace the battery:

1. Certifique-se de que o medidor esteja DESLIGADO.
2. Localize a tampa do compartimento da bateria na parte traseira do medidor.
3. Use uma chave de fenda para soltar o parafuso que prende a tampa da bateria.
4. Remove the cover and insert the 9V battery, observing correct polarity.
5. Recoloque a tampa da bateria e aperte o parafuso.

3.3 Conectando os Cabos de Teste

Para voltage, resistance, capacitance, frequency, diode, and continuity measurements, connect the supplied test leads:

• Insert the red test lead into the VΩHz+ input jack.
• Insira a ponta de teste preta no conector de entrada COM.

Figura 3: Componentes incluídos

4. Instruções de operação

The EX820A features a rotary function switch to select the desired measurement mode. Press the 'MODE' button to cycle through functions within a single switch position (e.g., AC/DC voltage, resistência/continuidade).

4.1 Medição de corrente alternada (Clamp)

1. Set the rotary switch to the 'A~' position.
2. Abra o clamp jaws by pressing the jaw release trigger.
3. Enclose a single conductor with the clamp mandíbulas. Certifique-se de que as mandíbulas estejam completamente fechadas.
4. Leia o valor da corrente alternada no visor.

Figure 4: Measuring AC Current with the Clamp

4.2 Medindo Vol AC/DCtage

1. Conecte os cabos de teste conforme descrito na Seção 3.3.
2. Coloque a chave rotativa na posição 'V'.
3. Press the 'MODE' button to select AC (V~) or DC (V–) voltage.
4. Aplique as pontas de prova nos pontos do circuito onde há tensão.tage deve ser medido.
5. Leia o vol.tage valor no display.

Figure 5: Measuring Voltage with Test Leads

4.3 Using the Infrared Thermometer

1. Set the rotary switch to the 'IR TEMP' position.
2. Point the meter's IR sensor (located at the top) towards the target surface. The laser pointer will assist in aiming.
3. Read the surface temperature on the display.

Figure 6: Using the Infrared Thermometer

4.4 LoZ (Low Impedance) Mode

The LoZ function is used to eliminate ghost voltages, which can cause misleading readings. When measuring voltage in circuits where ghost voltages are suspected, select the LoZ mode to provide a low impedance path that dissipates these stray voltage.

1. Set the rotary switch to the 'V LoZ' position.
2. Conecte as pontas de prova ao circuito.
3. Leia o vol.tage. This reading will be more accurate in the presence of ghost voltage.

4.5 Filtro Passa-Baixa (LPF)

The LPF function is designed for accurate measurements on variable frequency drives (VFDs) and other electrically noisy equipment. It filters out high-frequency noise that can distort True RMS readings.

1. Set the rotary switch to the 'A~' or 'V~' position.
2. Press the 'LPF' button to activate the Low Pass Filter. The LPF icon will appear on the display.
3. Proceed with your current or voltage medição.

4.6 Medição da corrente de pico

The Inrush function captures the maximum current surge when a motor or other inductive load starts up. This is useful for diagnosing motor starting issues.

1. Set the rotary switch to the 'A~' position.
2. Press the 'INRUSH' button. The meter will be ready to capture the inrush current.
3. Aplique o clamp to the motor's power lead and start the motor. The meter will display the peak inrush current.

5. Manutenção

5.1 Limpeza

Wipe the meter with a dry, soft cloth. Do not use abrasives or solvents. Periodically clean the input jacks with a cotton swab and alcohol to ensure good contact.

5.2 Substituição da bateria

Replace the 9V battery when the low battery indicator appears on the display. Refer to Section 3.2 for battery installation instructions. Always dispose of used batteries responsibly.

5.3 Armazenamento

When the meter is not in use for an extended period, remove the battery to prevent leakage. Store the meter in a cool, dry place, away from direct sunlight and extreme temperatures.

6. Solução De Problemas

• O medidor não liga: Verifique a instalação da bateria e certifique-se de que ela tenha carga suficiente. Substitua-a, se necessário.
• Nenhuma leitura ou 'OL' (Sobrecarga) exibido: Ensure test leads are properly connected and making good contact. Verify the measurement range is appropriate for the input. For current measurements, ensure only a single conductor is within the clamp mandíbulas.
• Leituras imprecisas: Verifique o volume da bateriatage. Ensure the correct function is selected. For voltage/current, consider using LoZ or LPF modes in noisy environments. Ensure proper contact with test points.
• IR Thermometer not working: Ensure the rotary switch is in the 'IR TEMP' position. Check for any obstructions to the IR sensor.

7. Especificações

8. Garantia e Suporte

8.1 Informações de garantia

The Extech EX820A Clamp O medidor vem com um Garantia de 2 ano from the date of purchase. This warranty covers defects in materials and workmanship under normal use. It does not cover damage resulting from misuse, unauthorized modification, accident, or neglect. Please retain your proof of purchase for warranty claims.

8.2 Suporte Técnico

For technical assistance, troubleshooting, or service inquiries, please refer to the official Extech website or contact Extech customer support. Contact information can typically be found in the full printed manual or on the manufacturer's website.