MASTECH MS5908C MS5908A LCD Circuit Analyzer Tester User Manual

Introduction

The MasTech MS5908C and MS5908A are advanced LCD Circuit Analyzer Testers designed for comprehensive electrical circuit diagnostics. These devices are capable of measuring various electrical parameters including voltage, frequency, impedance, and testing the reliability of Residual Current Devices (RCD) and Ground Fault Circuit Interrupters (GFCI). They are essential tools for electricians, technicians, and DIY enthusiasts to ensure electrical safety and proper circuit functionality.

Features

• TRMS (True Root Mean Square) measuring of AC Voltage.
• Artificial load testing for wire drop: MS5908A supports 12A, 15A, 20A; MS5908C supports 5A, 8A, 10A.
• Measures phase voltage, neutral wire voltage, voltage to earth, and frequency.
• Measures impedance for live wire, neutral wire, and earth wire conductors.
• Identifies 3-wire socket connection modes (neutral for left, live for right, presence of earth wire).
• Tests the reliability and response action time of Residual Current Devices (RCD).
• Tests the reliability and response action time of Ground Fault Circuit Interrupters (GFCI).
• Equipped with a backlight function for visibility in low-light conditions.
• Includes a data hold function to freeze readings on the display.

Specifications

Setup

1. **Unpacking**: Carefully remove the circuit analyzer and all accessories from the packaging. Verify that all components are present.
2. **Battery Installation**: The device requires 6 AAA batteries (not included).
   • Locate the battery compartment on the back of the unit.
   • Open the battery cover.
   • Insert 6 AAA batteries, ensuring correct polarity (+/-).
   • Close the battery cover securely.
3. **Power On**: Press the green power button to turn on the device. The LCD screen should illuminate.
4. **Connecting to Power**: Plug the circuit analyzer into the electrical outlet you wish to test. Ensure the correct regional power cord (EU for MS5908C, US for MS5908A) is used.

Operating Instructions

The MS5908C/MS5908A features an intuitive interface with an LCD display and several control buttons. Familiarize yourself with the buttons:

• **Power Button**: Turns the device ON/OFF.
• **FUNC (Function) Button**: Cycles through different measurement modes (e.g., voltage, frequency, impedance).
• **HOLD Button**: Freezes the current reading on the display. Press again to release.
• **TEST Button**: Initiates specific tests, such as RCD/GFCI tests.
• **Up/Down Arrow Buttons**: Used for navigation or adjusting parameters in certain modes.
• **Backlight Button**: Toggles the display backlight ON/OFF.

General Measurement (Voltage, Frequency, Impedance)

1. Plug the circuit analyzer into the desired outlet.
2. Press the **Power** button to turn on the device.
3. Use the **FUNC** button to cycle through the available measurement modes until the desired parameter (e.g., Wire Voltage, Frequency) is displayed.
4. The current reading will be shown on the LCD.
5. To hold a reading, press the **HOLD** button. Press again to resume live measurement.

RCD/GFCI Testing

Caution: RCD/GFCI testing will trip the circuit breaker. Ensure all connected devices are safely shut down or disconnected before performing this test.

1. Plug the circuit analyzer into the outlet protected by the RCD/GFCI.
2. Ensure the device is powered on and in the appropriate RCD/GFCI test mode (select using **FUNC** if necessary).
3. Press the **TEST** button. The device will simulate a fault condition to trigger the RCD/GFCI.
4. Observe the display for the tripping time and current.
5. If the RCD/GFCI does not trip within the specified time, it may be faulty and should be inspected by a qualified electrician.
6. Reset the circuit breaker after the test.

Wire Drop Measurement (MS5908A/MS5908C Specific)

This function measures the voltage drop across the circuit under an artificial load.

1. Plug the circuit analyzer into the outlet.
2. Select the wire drop measurement mode using the **FUNC** button.
3. The device will apply a specified artificial load (12A, 15A, 20A for MS5908A; 5A, 8A, 10A for MS5908C) and measure the voltage drop.
4. The result will be displayed on the LCD.

Maintenance

• **Cleaning**: Use a soft, dry cloth to clean the device. Do not use abrasive cleaners or solvents.
• **Storage**: Store the circuit analyzer in a cool, dry place away from direct sunlight and extreme temperatures. If storing for extended periods, remove the batteries to prevent leakage.
• **Battery Replacement**: When the low battery indicator appears on the LCD, replace all 6 AAA batteries promptly to ensure accurate readings and proper device function.
• **Inspection**: Regularly inspect the device for any signs of damage, such as cracks in the casing or frayed cables. Do not use a damaged device.

Troubleshooting

• **Device does not power on**: Check if the batteries are correctly installed and have sufficient charge. Replace batteries if necessary.
• **Inaccurate readings**: Ensure the device is properly connected to the outlet. Check battery level. Avoid using the device in environments with strong electromagnetic interference.
• **RCD/GFCI does not trip during test**: This indicates a potential fault with the RCD/GFCI itself. Consult a qualified electrician immediately.
• **Display issues**: If the display is dim or flickering, replace the batteries. If the issue persists, contact customer support.

User Tips

• Always ensure the device is in good working condition before use.
• For critical measurements, perform the test multiple times to confirm consistency.
• Keep the instruction manual handy for quick reference during operation.
• When testing RCD/GFCI, inform others in the area that power will be temporarily interrupted.

Warranty & Support

MasTech products are designed for reliability and performance. For warranty information, technical support, or service inquiries, please refer to the contact details provided with your purchase or visit the official MasTech website. Keep your proof of purchase for warranty claims.