Extech EX355 True RMS Multimeter with Temperature Measurement Instruction Manual

1. Introdução

This manual provides detailed instructions for the safe and effective operation of the Extech EX355 True RMS Multimeter. The EX355 is a professional digital multimeter designed for a wide range of electrical measurements, including AC/DC voltage, current, resistance, capacitance, frequency, duty cycle, and temperature. It features True RMS for accurate readings of non-sinusoidal waveforms, Non-Contact Voltage (NCV) detection for enhanced safety, Low Impedance (LoZ) mode to prevent ghost voltage readings, and a Low Pass Filter (LPF) for noise reduction in electrical environments.

Please read this manual thoroughly before using the device to ensure proper function and to prevent potential hazards.

2. Informações de segurança

Always adhere to the following safety precautions to avoid personal injury or damage to the multimeter:

• Leia todas as instruções: Familiarize yourself with the operation and safety features before use.
• Observe all warnings: Pay close attention to all warnings and cautions marked on the meter and in this manual.
• Use proper range: Always select the correct function and range for your measurement.
• Inspect test leads: Before each use, check test leads for damaged insulation or exposed metal. Replace if damaged.
• Do not exceed maximum input limits: Nunca aplique voltage or current that exceeds the specified maximum limits for the meter.
• Avoid live circuits: Do not measure resistance, continuity, or diode on live circuits.
• Tenha cuidado com vol altotagé: Be extremely careful when working with voltagtensões acima de 60V CC ou 30V CA RMS, pois representam risco de choque elétrico.
• Do not operate if damaged: If the meter appears damaged or is not operating properly, discontinue use immediately.
• Substituição da bateria: Replace batteries as soon as the low battery indicator appears to ensure accurate readings.
• CAT III 600V: This meter is designed for measurements in CAT III 600V environments.

3. Produto acabadoview

The Extech EX355 is a versatile True RMS Multimeter equipped with several advanced features for accurate and safe electrical testing.

Principais características:

• 12 Funções de Medição: Includes AC/DC voltage, corrente, resistência, capacitância, frequência, ciclo de trabalho e temperatura.
• True RMS Accuracy: Ensures precise readings for both standard and distorted electrical waveforms.
• Vol sem contatotage (NCV) Detecção: Allows for quick and safe detection of AC voltage sem contato direto.
• Low Impedance (LoZ) Mode: Impede leituras falsas causadas por volumes fantasmas.tages em circuitos.
• Filtro passa-baixo (LPF): Reduces high-frequency noise for stable and accurate measurements in noisy environments.
• Mostrar: 4000 count LCD display with backlight.
• Data Hold, Min/Max, Relative Mode: For capturing and analyzing measurements.
• Desligamento automático: Economiza a vida útil da bateria.
• Teste de continuidade e de diodo: Essencial para diagnóstico de circuitos.

Figure 1: The Extech EX355 True RMS Multimeter. This image shows the front view of the multimeter, highlighting its display, rotary dial, function buttons, and input jacks.

4. Configuração

4.1 Instalação da bateria

The Extech EX355 requires two (2) AA batteries for operation. These are typically included with the device.

1. Certifique-se de que o multímetro esteja desligado.
2. Localize a tampa do compartimento da bateria na parte traseira da unidade.
3. Desaperte o(s) parafuso(s) de fixação e remova cuidadosamente a tampa.
4. Insira duas pilhas AA, observando a polaridade correta (+ e -) conforme indicado dentro do compartimento.
5. Recoloque a tampa do compartimento da bateria e fixe-a com o(s) parafuso(s).

Observação: Replace batteries immediately when the low battery indicator appears on the display to maintain measurement accuracy.

4.2 Conectando os Cabos de Teste

Conecte sempre os cabos de teste corretamente para a função de medição desejada.

• Para a maioria dos volumestage, resistance, continuity, diode, capacitance, and frequency measurements, insert the red test lead into the CAPA VΩHz Jack e o teste preto levam ao COM Jack.
• Para medições de corrente até 10A, insira o cabo de teste vermelho no 10A Jack e o teste preto levam ao COM Jack.
• Para medições de corrente até 400 mA, insira o cabo de teste vermelho no mAµA Jack e o teste preto levam ao COM Jack.
• Ensure test leads are fully inserted into the jacks.

5. Instruções de operação

This section details how to perform various measurements using the Extech EX355 multimeter.

5.1 Vol AC/DCtage Medição

1. Coloque o seletor rotativo na posição V~ (AC Voltage) ou V- (DC Vol.tage) posição.
2. Conecte o cabo de teste vermelho ao CAPA VΩHz Jack e o teste preto levam ao COM Jack.
3. Toque as pontas de prova nos pontos do circuito onde há tensão.tage deve ser medido.
4. Leia o vol.tage valor no display.

5.2 Medição de corrente CA/CC

Cuidado: Nunca ligue o multímetro em paralelo com um circuito de voltagem.tagAo medir a corrente, utilize uma fonte de alimentação. Sempre conecte em série com a carga.

1. Set the rotary dial to the appropriate A~ (Corrente CA) ou A- (DC Current) range (e.g., 10A or mAµA).
2. Conecte o cabo de teste vermelho ao 10A or mAµA Jack e o teste preto levam ao COM Jack.
3. Open the circuit where current is to be measured and connect the test probes in series.
4. Leia o valor atual no visor.

5.3 Medição de Resistência

Aviso: Certifique-se de que o circuito esteja desenergizado antes de medir a resistência.

1. Coloque o seletor rotativo na posição Ω (Posição de resistência).
2. Conecte o cabo de teste vermelho ao CAPA VΩHz Jack e o teste preto levam ao COM Jack.
3. Touch the test probes across the component or circuit segment to be measured.
4. Leia o valor da resistência no display.

5.4 Medição de Capacitância

Aviso: Discharge capacitors before measuring to prevent damage to the meter.

1. Coloque o seletor rotativo na posição CAP (Posição de capacitância).
2. Conecte o cabo de teste vermelho ao CAPA VΩHz Jack e o teste preto levam ao COM Jack.
3. Encoste as pontas de prova nos terminais do capacitor.
4. Leia o valor da capacitância no display.

5.5 Medição de Frequência e Ciclo de Trabalho

1. Coloque o seletor rotativo na posição Hz /% Posição (Frequência/Ciclo de Trabalho).
2. Conecte o cabo de teste vermelho ao CAPA VΩHz Jack e o teste preto levam ao COM Jack.
3. Touch the test probes to the signal source.
4. Pressione o Hz /% button to toggle between frequency and duty cycle readings.

5.6 Medição de Temperatura

The EX355 includes a general purpose bead wire temperature probe.

1. Coloque o seletor rotativo na posição Temperatura (Temperatura) posição.
2. Insert the temperature probe into the CAPA VΩHz (positivo) e COM (negative) jacks, observing polarity.
3. Place the tip of the temperature probe on or in the object to be measured.
4. Read the temperature value on the display. The unit can display in Celsius or Fahrenheit.

Figure 2: Using the Extech EX355 to measure temperature in an HVAC vent. The image shows a person holding the multimeter and inserting the temperature probe into an air conditioning vent.

5.7 Volume sem contatotage (NCV) Detecção

NCV mode allows for quick detection of AC voltage sem contato direto, aumentando a segurança.

1. Coloque o seletor rotativo na posição VNC posição.
2. Move the top of the multimeter near a conductor or outlet.
3. The NCV indicator light will illuminate and an audible beep will sound if AC voltage is detected. The intensity of the beep and light may increase with stronger fields.

5.8 Low Impedance (LoZ) Mode

LoZ mode helps eliminate false readings caused by ghost voltage.

1. Coloque o seletor rotativo na posição LoZ V posição.
2. Connect the test leads as for standard voltage medição.
3. The meter will present a low impedance load to the circuit, dissipating ghost voltages and providing a more accurate reading of actual voltage.

5.9 Filtro Passa-Baixa (LPF)

The LPF function is used to filter out high-frequency noise, providing stable readings in variable frequency drive (VFD) applications or other noisy electrical environments.

1. Set the rotary dial to an AC Voltage (V~) or AC Current (A~) faixa.
2. Pressione o LPF button to activate the low pass filter. The LPF icon will appear on the display.
3. Perform your measurement as usual. The meter will now display readings with high-frequency noise attenuated.
4. Pressione o LPF button again to deactivate the filter.

Figure 3: The Extech EX355 Multimeter in use, connected to an electrical control panel. This image demonstrates the multimeter's application in industrial or commercial electrical diagnostics.

Figure 4: The Extech EX355 Multimeter connected to a fuse box. This image illustrates the multimeter being used for testing within a residential or commercial electrical distribution system.

5.10 Data Hold, Min/Max, Relative Mode

• Dados em espera: Pressione o SEGURAR Pressione o botão para congelar a leitura atual no visor. Pressione novamente para liberar.
• Mínimo máximo: Pressione o MÍNIMO MÁXIMO button to enter Min/Max recording mode. The meter will display the maximum reading. Press again to cycle through minimum and average readings. Hold the button to exit.
• Modo Relativo: Pressione o REL button to store the current reading as a reference value. Subsequent measurements will be displayed as a difference from this reference. Press again to exit.

5.11 Continuity and Diode Test

Aviso: Ensure the circuit is de-energized before performing continuity or diode tests.

• Continuidade: Coloque o seletor rotativo na posição Ω (Resistance) position and press the SELECIONAR button until the continuity symbol (♫) appears. A continuous beep indicates a low resistance path (continuity).
• Teste de Diodo: Coloque o seletor rotativo na posição Ω (Resistance) position and press the SELECIONAR button until the diode symbol (→|) appears. Connect the red lead to the anode and black lead to the cathode for forward bias voltage drop. Reverse leads for reverse bias.

6. Manutenção

6.1 Substituição da bateria

Refer to section 4.1 for detailed instructions on replacing the two AA batteries. Always use fresh, high-quality AA batteries.

6.2 Substituição de fusíveis

If the current measurement functions cease to work, the fuse may need replacement. This procedure should only be performed by qualified personnel.

1. Ensure the multimeter is powered off and all test leads are disconnected.
2. Remova a tampa do compartimento das pilhas e as pilhas.
3. Unscrew the case screws and carefully separate the two halves of the meter casing.
4. Locate the blown fuse(s). The EX355 typically uses two fuses: a 0.5A/600V fast-blow fuse for the mA/µA input and a 10A/600V fast-blow fuse for the 10A input.
5. Replace the fuse(s) with fuses of the exact same type and rating. Never use a fuse with a different rating.
6. Carefully reassemble the meter casing, ensuring all screws are tightened. Reinstall batteries and the battery cover.

6.3 Limpeza e Armazenamento

• Clean the meter regularly with a damp pano e detergente neutro. Não use produtos abrasivos ou solventes.
• Certifique-se de que o medidor esteja completamente seco antes de usá-lo.
• When storing the meter for extended periods, remove the batteries to prevent leakage.
• Guarde o medidor em local fresco e seco, longe da luz solar direta e de temperaturas extremas.

7. Solução De Problemas

8. Especificações

The following table outlines the key specifications for the Extech EX355 True RMS Multimeter:

Figure 5: Extech EX355 Multimeter with approximate dimensions shown in inches and centimeters. This image provides a visual reference for the physical size of the device.

9. Informações de garantia

Extech provides a warranty for its products. Specific warranty terms and conditions, including duration and coverage, may vary by region and product. For detailed warranty information, please refer to the warranty card included with your product or visit the official Extech webGuarde o comprovante de compra como prova para eventuais solicitações de garantia.

10. Suporte ao cliente

For technical assistance, troubleshooting, or service inquiries regarding your Extech EX355 Multimeter, please contact Extech customer support. You can typically find contact information, including phone numbers and email addresses, on the official Extech website ou na documentação fornecida com o seu produto.

Recursos on-line: Visit the official Extech website for FAQs, product downloads, and additional support resources.