Manual do usuário do kit de teste de resistência de aterramento Extech 382252

1. Introdução

The Extech 382252 is a comprehensive Earth Ground Resistance Tester Kit designed for accurate measurement of earth ground resistance. This kit provides three selectable ranges for earth ground resistance: 20 Ohms (Ω), 200 Ohms (Ω), and 2000 Ohms (Ω). Beyond earth ground testing, the device also functions as a multimeter, capable of measuring AC/DC Voltage, Resistance, and Continuity. It features automatic zero adjustment for ease of use. This manual provides detailed instructions for the safe and effective operation, maintenance, and troubleshooting of your Extech 382252.

2. Informações de segurança

Aviso: Improper use of this meter can cause damage, shock, injury, or death. Read and understand all safety information and operating instructions before using this instrument. Always adhere to local and national safety codes.

• Não ultrapasse os limites máximos de entrada para nenhuma função.
• Tenha extrema cautela ao trabalhar com circuitos elétricos energizados.
• Ensure the meter is in good working condition and free from damage before use.
• Utilize sempre a função e a faixa de medição corretas.
• Substitua as pilhas quando o indicador de bateria fraca acender para garantir leituras precisas.
• Keep hands and fingers away from test probe tips when making measurements.
• Não utilize o medidor em atmosferas explosivas ou na presença de gases ou poeira inflamáveis.

3. Conteúdo da embalagem

Ao desembalar, verifique se todos os itens estão presentes e sem danos:

• Extech 382252 Earth Ground Resistance Tester
• Test Leads (set)
• Auxiliary Earth Bars (2 pieces)
• Estojo de transporte
• Protective Rubber Holster
• 1.5V AA Batteries (6 pieces)

Image 1: The Extech 382252 Earth Ground Resistance Tester Kit, showing the main unit, test leads, two auxiliary earth bars, and the carrying case.

4. Recursos do Produto

The Extech 382252 offers the following key features:

• Earth Ground Resistance measurement in three ranges: 20Ω, 200Ω, and 2000Ω.
• AC / DC Voltage measurement capabilities.
• Resistance and Continuity testing functions.
• Automatic zero adjustment for accurate readings.
• Visor LCD grande e de fácil leitura.
• Função Data Hold para congelar as leituras exibidas.
• Retroiluminação para melhor visibilidade em condições de pouca luz.
• Durable protective rubber holster.

Imagem 2: Frente view of the Extech 382252 Earth Ground Resistance Tester, highlighting its display, function dial, and control buttons.

5. Configuração

5.1 Instalação da bateria

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 remover o(s) parafuso(s) que prendem a tampa.
4. Insert six (6) 1.5V AA batteries, observing correct polarity (+/-).
5. Recoloque a tampa do compartimento da bateria e fixe-a com o(s) parafuso(s).

5.2 Conectando os Cabos de Teste

Connect the test leads to the appropriate input jacks on the meter for the desired measurement function. For earth ground resistance testing, specific connections involving the auxiliary earth bars will be detailed in the operating instructions.

6. Instruções de operação

6.1 Ligar/Desligar

Rotate the function dial from the 'OFF' position to any desired measurement function to power on the meter. To power off, rotate the dial back to the 'OFF' position.

6.2 Automatic Zero Adjustment

The meter features automatic zero adjustment. When selecting a resistance range, the meter will automatically adjust to zero, compensating for lead resistance. Ensure test leads are not shorted or open during this process for accurate zeroing.

6.3 Função de retenção de dados

Press the 'HOLD' button to freeze the current reading on the display. Press it again to release the hold and resume live readings.

6.4 Função de retroiluminação

Press the backlight button (often indicated by a light bulb icon) to illuminate the display for better visibility in dark environments. Press it again to turn off the backlight.

7. Earth Ground Resistance Measurement

The Extech 382252 uses the 3-wire (or Fall-of-Potential) method for earth ground resistance measurements. This method requires the use of the two auxiliary earth bars provided.

7.1 Measurement Procedure (3-Wire Method)

1. Preparação: Ensure the circuit under test is de-energized and safely isolated.
2. Placement of Auxiliary Earth Bars:
   • Drive the first auxiliary earth bar (P) into the ground at a suitable distance from the earth electrode (E) being tested.
   • Drive the second auxiliary earth bar (C) into the ground at a further distance from P, ensuring all three points (E, P, C) are in a straight line. Typical distances are 5-10 meters (15-30 feet) between E and P, and P and C, but may vary based on soil conditions and electrode size.
3. Conectando leads de teste:
   • Connect the 'E' terminal of the meter to the earth electrode under test.
   • Connect the 'P' terminal of the meter to the first auxiliary earth bar (P).
   • Connect the 'C' terminal of the meter to the second auxiliary earth bar (C).
4. Selecione o intervalo: Rotate the function dial to the desired Earth Ground Resistance range (20Ω, 200Ω, or 2000Ω). Start with the highest range if the resistance value is unknown.
5. Realizar teste: Press the 'TEST' button. The meter will inject a current and measure the voltage drop to calculate the earth ground resistance.
6. Leitura de Medição: The resistance value will be displayed on the LCD.
7. Verificar precisão: For critical measurements, it is recommended to repeat the test with the auxiliary earth bars placed at slightly different distances to ensure the reading is stable and accurate.

8. Other Measurements

8.1 Vol AC/DCtage Medição

1. Connect the red test lead to the 'V' input jack and the black test lead to the 'COM' input jack.
2. Rotate the function dial to the desired ACV (750V AC) or DCV (1000V DC) range.
3. Conecte as pontas de prova ao circuito ou componente a ser medido.
4. Leia o vol.tage valor no display.

8.2 Medição de Resistência

1. Certifique-se de que o circuito ou componente esteja desenergizado.
2. Connect the red test lead to the 'V' input jack and the black test lead to the 'COM' input jack.
3. Rotate the function dial to the desired Resistance range (e.g., 200Ω, 20kΩ, 200kΩ).
4. Conecte as pontas de prova de teste ao componente.
5. Leia o valor da resistência no display.

8.3 Teste de Continuidade

1. Certifique-se de que o circuito ou componente esteja desenergizado.
2. Connect the red test lead to the 'V' input jack and the black test lead to the 'COM' input jack.
3. Rotate the function dial to the Continuity position (often indicated by a speaker icon).
4. Conecte as pontas de prova nos terminais do componente ou fio.
5. An audible beep indicates continuity (low resistance). The display will show the resistance value.

9. Manutenção

9.1 Limpeza

Wipe the meter with a dry, soft cloth. Do not use abrasives or solvents. Periodically clean the test leads and probes to ensure good electrical contact.

9.2 Substituição da bateria

When the low battery indicator appears on the display, replace the batteries promptly to maintain measurement accuracy. Refer to Section 5.1 for battery installation instructions.

9.3 Armazenamento

If the meter is to be stored for an extended period, remove the batteries to prevent leakage and damage. Store the meter in its carrying case in a cool, dry environment, away from direct sunlight and extreme temperatures.

10. Solução De Problemas

• No Display/Meter Not Powering On: Check battery installation and ensure batteries are fresh. Verify the function dial is not in the 'OFF' position.
• Leituras imprecisas: Ensure test leads are properly connected and not damaged. Check battery level. For earth ground resistance, verify proper placement and connection of auxiliary earth bars and ensure good contact with the ground.
• Sem sinal sonoro de continuidade: Verifique se o circuito está realmente contínuo. Certifique-se de que os cabos de teste estejam fazendo bom contato.
• Display Shows 'OL' (Overload): The measured value exceeds the selected range. Switch to a higher range.

If issues persist after following these steps, contact customer support.

11. Especificações

12. Garantia

The Extech 382252 Earth Ground Resistance Tester Kit typically comes with a Garantia limitada de 1 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, accident, unauthorized repair, or modification. Please retain your proof of purchase for warranty claims.

13. Suporte

For technical assistance, calibration services, or further information regarding your Extech 382252, please refer to the official Extech website or contact their customer support department. Contact details can usually be found on the manufacturer's website ou na documentação incluída com o seu produto.