Megger MFT1711 Multifunction Tester User Manual

1. Introduction

The Megger MFT1711 is an advanced entry-level multifunction tester designed to meet the testing requirements of BS7671. It is an improved version of the Megger MFT1710, suitable for testing single-phase electrical installations in both domestic and commercial environments. This instrument is ideal for Part-P installers performing smaller electrical installation certificates and for experienced electro-inspectors conducting health reports for electrical installations.

Certified to IEC 61010 CATIV 300V, the MFT1711 allows for safe testing of all parts of a low voltage network up to the supply transformer, while being robust enough to withstand accidental misuse and voltage peaks. Its ergonomic design facilitates operation whether hung on the ground, a conductor board, or around the neck. The device features two "test" and "lock" buttons, accommodating both right-handed and left-handed users. Built for frequent use in demanding environments, the MFT1711 is protected by a rubber casing and boasts an IP54 rating for resistance against water and dust.

All test settings are easily programmable using two color-coded rotary switches. Measurements are displayed on a sharp, large backlit screen with a patented digital/analog arc for fluctuating readings and a dual-digital display for precise values.

2. Key Features

• Beginner-friendly design: Simple user interface with easy access to all necessary tests.
• Fully automatic RCD test: Streamlined testing of Residual Current Devices.
• Versatile application: Suitable for commercial, industrial, and domestic low voltage systems.
• IEC 61010 CATIV 300V certified: Ensures safety for testing up to the supply transformer.
• Ergonomic design: Features dual "test" and "lock" buttons for ambidextrous use.
• Robust construction: Rubber casing and IP54 rating for protection against water and dust.
• Clear display: Large, backlit screen with digital/analog arc and dual-digital display.

3. What's in the Box

The Megger MFT1711 Multifunction Tester package typically includes the following items:

• Megger MFT1711 Multifunction Tester unit
• Test leads (red, green, blue)
• Crocodile clips
• Test probes
• Mains plug test lead
• Carrying case
• Neck strap
• 6 AA batteries (pre-installed or included separately)
• Quick Start Guide
• Certificate of Calibration

Image: The Megger MFT1711 Multifunction Tester shown with its included accessories, including test leads, probes, crocodile clips, mains plug lead, and the protective carrying case.

4. Setup

4.1. Battery Installation

The Megger MFT1711 requires 6 AA batteries for operation. These are typically included with the device. To install or replace batteries:

1. Ensure the device is turned off.
2. Locate the battery compartment on the rear of the unit.
3. Open the battery compartment cover.
4. Insert the 6 AA batteries, observing the correct polarity (+/-) as indicated inside the compartment.
5. Close the battery compartment cover securely.

4.2. Initial Power On and Self-Test

Upon first power-on or after battery replacement, the MFT1711 may perform a self-test. Ensure the rotary switches are in the OFF position before powering on.

1. Turn the main rotary switch from OFF to any measurement function (e.g., V).
2. The display will illuminate, and the device will perform a brief self-check.
3. Once the self-check is complete, the device is ready for use.

4.3. Connecting Test Leads

Always ensure the correct test leads are connected to the appropriate terminals for the desired measurement. Refer to the specific test section for detailed connection instructions.

Image: A close-up view of the Megger MFT1711's front panel, showing the large digital display, the two main rotary switches for function selection, and the test buttons.

5. Operating Instructions

The Megger MFT1711 features intuitive controls with two main rotary switches for selecting measurement functions and ranges. The large backlit display provides clear readings.

5.1. Function Selection

Use the left rotary switch to select the primary measurement category (e.g., Insulation, Continuity, Loop/RCD). Use the right rotary switch to select specific ranges or sub-functions within that category.

5.2. Performing a Test

Once the desired function is selected and test leads are connected:

1. Ensure the circuit under test is de-energized if required by the test type (e.g., Insulation, Continuity).
2. Connect the test leads to the circuit points as per the specific test procedure.
3. Press and hold the "TEST" button to initiate the measurement. For continuous measurements or hands-free operation, press the "LOCK" button.
4. Observe the reading on the display.
5. Release the "TEST" button or press "LOCK" again to stop the measurement.

5.3. Specific Measurement Functions

Detailed instructions for each measurement function are provided in the full user manual. Below is a brief overview:

• Insulation Resistance (MΩ): Measures the resistance of insulation between conductors or between conductors and earth. Select appropriate test voltage (250V, 500V, 1kV).
• Continuity (Ω): Measures the resistance of protective conductors and bonding. Typically uses a low test current.
• Loop Impedance (Z): Measures the impedance of the earth fault loop. Essential for verifying protective device operation.
• RCD Test (RCD(mA)): Tests the tripping time and current of Residual Current Devices. Features fully automatic RCD testing.
• Voltage (V) and Frequency (Hz): Measures AC/DC voltage and frequency.

6. Maintenance

6.1. Cleaning

To maintain the integrity and appearance of your MFT1711:

• Wipe the exterior of the unit with a soft, damp cloth.
• Do not use abrasive cleaners or solvents, as these may damage the casing or display.
• Ensure no moisture enters the device through the terminals or battery compartment.

6.2. Battery Care and Replacement

Regularly check the battery level indicator on the display. Replace batteries promptly when low to ensure accurate measurements and prevent damage from battery leakage.

• If the device will not be used for an extended period, remove the batteries to prevent leakage.
• Dispose of used batteries according to local regulations.

6.3. Storage

Store the MFT1711 in its protective carrying case in a cool, dry place, away from direct sunlight and extreme temperatures.

6.4. Calibration

For professional use, it is recommended to have the Megger MFT1711 calibrated annually by an authorized service center to ensure continued accuracy and compliance with standards. Refer to the included Certificate of Calibration for details on the next recommended calibration date.

7. Troubleshooting

If you encounter problems not listed here or if the suggested solutions do not resolve the issue, please contact Megger customer support or an authorized service center.

8. Specifications

9. Warranty and Support

Megger products are known for their reliability and quality. The MFT1711 typically comes with a manufacturer's warranty covering defects in materials and workmanship. Please refer to the warranty card or documentation included with your product for specific terms, conditions, and duration of the warranty.

For technical support, service, or warranty claims, please contact Megger customer service directly. Contact information can usually be found on the Megger official website or in the product documentation.

Megger Official Website: www.megger.com

When contacting support, please have your product model number (AVO/MFT1711) and serial number (if applicable) ready.