MH13 Digital Insulation Resistance Tester User Manual

1. Introduction

The KKnoon MH13 Digital Insulation Resistance Tester is a high-stability and reliable instrument designed for measuring insulation resistance, AC/DC voltage, and more. It features a large LCD display with backlight, auto-ranging capabilities, and data storage, making it suitable for various electrical testing applications.

This manual provides detailed instructions for the safe and effective operation, maintenance, and troubleshooting of your MH13 tester. Please read this manual thoroughly before use to ensure proper functionality and safety.

2. Safety Information

WARNING: Improper use of this instrument can cause damage, shock, injury, or death. Read and understand all safety information and operating instructions before use.

• Always ensure the device is powered off and disconnected from any circuits before connecting or disconnecting test leads.
• Do not use the tester if it appears damaged or is operating abnormally.
• Observe all local and national safety codes.
• Avoid touching the test leads or the circuit under test during high voltage measurements.
• Ensure proper battery installation and replacement as specified.
• The device indicates high voltage during testing; exercise extreme caution.

3. Product Overview

Figure 3.1: Front view of the MH13 Digital Insulation Resistance Tester, showing the LCD display, control buttons, and input terminals.

Figure 3.2: Detailed view of the MH13 tester, illustrating its dimensions and the functions of each button, including TEST, HOLD, SELECT, MEM READ, and PI/DAR.

3.1 Package Contents

Verify that all items listed below are included in your package:

• 1 x Insulation Resistance Tester (MH13)
• 1 x Signal Shielding Wire
• 2 x Test Leads
• 2 x Alligator Clips
• 1 x Storage Bag
• 1 x User Manual (English)

4. Setup

4.1 Battery Installation

The MH13 tester requires 8 x 1.5V AA batteries (not included). To install the batteries:

1. Locate the battery compartment on the rear of the device.
2. Use a screwdriver to open the battery compartment cover.
3. Insert 8 AA batteries, ensuring correct polarity (+/-).
4. Replace the battery compartment cover and secure it with the screw.

Note: The device features a low battery indication to remind you when to replace batteries.

4.2 Connecting Test Leads

Connect the test leads to the appropriate input terminals on the tester. For most measurements, the red lead connects to the "LINE" terminal and the black lead to the "EARTH" terminal. For specific measurements like AC/DC voltage, refer to the relevant operating instructions.

5. Operating Instructions

5.1 Power On/Off

Press and hold the POWER button for 2 seconds to turn the device on or off.

5.2 Insulation Resistance Measurement

This function is used to measure the insulation resistance of various electrical equipment and insulating materials.

Figure 5.1: The MH13 tester connected to a motor for insulation resistance measurement, demonstrating the high voltage output capability.

1. Ensure the circuit under test is de-energized and safely isolated.
2. Connect the test leads to the two ends of the component or circuit you wish to test.
3. Select the desired output voltage (250V, 500V, 1000V, 2000V, or 2500V) using the Up/Down arrow buttons.
4. Press the TEST button to initiate the measurement. The red light on the TEST button will illuminate.
5. The insulation resistance value will be displayed on the LCD.
6. After the measurement, the device will automatically discharge the circuit. Do not touch the test leads until the discharge is complete.

Note: The device has a high voltage indication to alert users during testing.

5.3 AC/DC Voltage Measurement

The MH13 can also measure AC and DC voltages within the range of 10V to 600V.

Figure 5.2: Illustration of how to connect the test leads for measuring AC voltage (left) and DC voltage (right) using the MH13 tester.

1. In the standby interface, short press the SELECT button to enter the AC voltage function. Press it again to switch to the DC voltage function.
2. Adjust the gear to the ACV or DCV voltage gear for measurement.
3. Insert the test lead plug into the appropriate terminals (AC and G for AC, DC and G for DC).
4. The voltage reading will be displayed on the LCD.

5.4 Absorption Ratio (DAR) and Polarization Index (PI)

The MH13 supports the calculation of Absorption Ratio (DAR) and Polarization Index (PI), which are crucial for assessing the quality of insulation.

Figure 5.3: Explanation of Absorption Ratio (DAR) measurement, showing 15-second and 1-minute insulation resistance readings and the calculation formula.

Figure 5.4: Explanation of Polarization Index (PI) measurement, showing 1-minute and 10-minute insulation resistance readings and the calculation formula.

To perform DAR/PI tests:

1. Set up for insulation resistance measurement as described in Section 5.2.
2. Press the PI/DAR button to initiate the test. The device will automatically compute and display the DAR and PI values based on timed measurements.
3. Refer to the judgment standards provided in the product documentation for interpreting the results.

5.5 Data Hold and Storage

The MH13 can store up to 100 sets of measured insulation resistance values.

Figure 5.5: The display showing multiple stored data sets, indicating the device's 100-set data storage capability.

• Data Hold: During a measurement, single press the HOLD button to freeze the current reading on the display. Press again to release.
• Data Storage: After a measurement, press the MEM READ button to save the data.
• View Stored Data: Press the MEM READ button to enter data browsing mode. Use the Up/Down arrow buttons to navigate through stored data groups.
• Delete Stored Data: Refer to the full manual for instructions on deleting stored data, if applicable.

5.6 Signal Shielding for Measurement Accuracy

To minimize errors caused by "word jumping" phenomena in measurements, especially with sensitive insulation tests, utilize the signal shielding wire.

Figure 5.6: The MH13 tester connected with a signal shielding wire, demonstrating how to reduce measurement errors by connecting the inner jack to the cable shell.

When a serious word jumping phenomenon occurs, insert the signal shielding wire's inner jack into the "G" (Guard) terminal. Connect the other end of the shielding wire to the cable shell or the inner insulation of the core to eliminate the error.

6. Maintenance

6.1 Cleaning

Wipe the device with a dry, soft cloth. Do not use abrasive cleaners or solvents. Ensure no liquids enter the device.

6.2 Storage

When not in use for extended periods, remove the batteries to prevent leakage. Store the tester in its provided storage bag in a cool, dry place, away from direct sunlight and extreme temperatures.

Figure 6.1: The MH13 tester protected by its anti-drop silicone case, highlighting its durable design for outdoor use and protection against damage.

The device is designed with a durable anti-drop silicone case, offering protection against accidental drops and impacts.

7. Troubleshooting

8. Specifications

9. Warranty and Support

For warranty information, technical support, or service inquiries, please refer to the official KKnoon website or contact their customer service directly. Details are typically provided in the full product manual or on the manufacturer's official channels.