ANENG MH15 Digital Insulation Megohmmeter User Manual

1. Introduction

The ANENG MH15 is a battery-powered digital insulation resistance tester designed for measuring various electrical parameters. It can be used to measure DC voltage, AC voltage, resistance, audible continuity, diode functionality, and insulation resistance. For insulation resistance measurements, users can select from four test voltages: 100V, 250V, 500V, and 1000V. This instrument features polarity indication, over-range indication, data hold, and automatic hold, making it a precise and user-friendly measuring tool.

This instrument is designed in accordance with EN61010-1 for electronic measuring instruments with an over-voltage category of CAT IV 600V & CAT III 1000V and Pollution Degree 2.

2. Safety Information

WARNING: To prevent electric shock, personal injury, or damage to the meter or equipment under test, always adhere to the following safety rules:

• Before using the meter, inspect its casing. Do not use the meter if it is damaged or if any part of the casing is removed. Check for cracks or missing plastic, especially around the connectors.
• Inspect the test leads for damaged insulation or exposed metal. Verify the continuity of the test leads.
• Do not apply voltage exceeding the rated voltage marked on the meter, either between terminals or between any terminal and ground.
• The rotary switch must be in the correct position. Do not change the range during measurement to prevent damage to the meter.
• When the meter operates at an effective voltage over 60V DC or 30V RMS AC, exercise special care due to the danger of electric shock.
• Use the appropriate terminals, function, and range for your measurements.
• Do not use or store the meter in environments with high temperature, humidity, explosive or flammable gases, or strong magnetic fields. Performance may degrade in damp conditions.
• When using test leads, keep your fingers behind the finger guards.
• Disconnect circuit power and discharge all high-voltage capacitors before testing resistance, continuity, or diodes.
• Replace the battery as soon as the low battery indicator appears. A low battery can cause false readings, leading to electric shock or personal injury.
• Remove connections between test leads and the circuit, and turn off the meter before opening the casing.
• When servicing, use only identical replacement parts with the same model number and electrical specifications.
• The internal circuit must not be altered to prevent damage or accidents.
• Clean the meter surface with a soft cloth and mild detergent. Avoid abrasive cleaners or solvents to prevent corrosion or damage.
• The meter is suitable for indoor use.
• Turn off the meter when not in use and remove batteries for long-term storage. Regularly check batteries for leaks and replace them if necessary, as leaking batteries can damage the meter.

Electrical Symbols

• ~ : AC (Alternating Current)
• ⎓ : DC (Direct Current)
• ⎓~ : DC or AC
• ⚠ : Important safety information. Refer to the manual.
• ▲ : Dangerous voltage may be present.
• ⏚ : Earth ground
• CE : Conforms to European Union directive
• ☐ : Double insulated

3. Product Components and Panel Description

The ANENG MH15 features a robust design with a silicone sheath for protection against bumps and damage, making it convenient for various applications.

1. Measuring Voltage/Resistor/Capacitor/Diode/Buzzer (Red Dial Positive Input): Terminal for red test lead for most measurements, except insulation resistance.
2. Black Watch Pen Negative Input: Terminal for black test lead for most measurements.
3. Insulation Resistance Test Red Gauge Pen Positive Input Terminal (INS+): Red lead connection for insulation resistance measurement.
4. Insulation Resistance Test Black Gauge Pen Negative Input Terminal (INS-): Black lead connection for insulation resistance measurement.
5. LCD Display: Digital display screen with analog segments.
6. BL Button: Screen backlight on/off button.
7. HOLD Button: Press to hold or release data on the display.
8. RANGE Button: Manually select the measurement range.
9. SELECT Button: Used for function selection in multi-functional measurement modes.
10. LOCK Button: Used to lock or unlock the insulation resistance measurement function. If pressed once, then TEST is pressed, the instrument will continue measuring until LOCK is pressed again.
11. TEST Button: Press and hold to start insulation resistance measurement. Release to stop and hold the final value.
12. Function Turntable (OFF): Selects the desired function and turns the instrument on/off.
13. Silicone Sheath: Provides effective anti-drop protection.

4. Specifications

Accuracy is guaranteed for 1 year at 23±5°C, ≤75%RH.

Insulation Resistance Functional Range

Note: Minimum measurable resistance is 0.1MΩ.

5. Setup

5.1 Battery Installation

The ANENG MH15 requires six 1.5V AA batteries (not included) for power. To install the batteries:

1. Open the battery compartment cover located on the back of the device.
2. Insert six AA batteries, ensuring correct polarity (+/-).
3. Close the battery compartment cover securely.

5.2 Connecting Test Leads

The device comes with test leads and alligator clips. To connect them:

1. For most measurements (voltage, resistance, continuity, diode, capacitance), connect the black test lead to the "COM" jack and the red test lead to the "VΩ+" jack.
2. For insulation resistance measurements, connect the black probe to the "INS-" terminal and the red probe to the "INS+" terminal.
3. If using alligator clips, align the pen with the alligator clip, insert it into the bayonet metal, and tighten.

6. Operating Instructions

6.1 General Operation

1. Power On/Off and Function Selection: Turn the Function/Range switch (12) to the desired function to power on the instrument. Turn to "OFF" to power off.
2. Manual and Automatic Ranging: After selecting a function, the instrument typically enters automatic mode, indicated by "AUTO" on the screen. Press the "RANGE" button once to switch to manual range mode. Press and hold "RANGE" for about 2 seconds to return to automatic range mode.
3. Data Hold Mode: Press the "HOLD" button once to enter data hold mode, locking the reading and displaying "H". Press "HOLD" again or switch functions to release data hold.
4. Screen Backlight: Press the "BL" button to turn the screen backlight on or off.

6.2 Measuring AC/DC Voltage

To measure voltage:

1. Connect the black test lead to the "COM" jack and the red test lead to the "VΩ+" jack.
2. Set the Function/Range switch to the V~ (AC) or V⎓ (DC) range. The default is DC voltage measurement. Press the "SELECT" button to switch between AC and DC voltage measurement.
3. Connect the test leads across the source or load to be measured.
4. Read the value on the LCD display. For DC measurements, the polarity of the red lead connection will be indicated.

NOTE: Do not apply voltage greater than 750V AC or 1000V DC to the input terminals to avoid electric shock or instrument damage.

6.3 Measuring Resistance

To measure resistance:

1. Connect the black test lead to the "COM" jack and the red test lead to the "VΩ+" jack.
2. Set the Function/Range switch to the Ω range.
3. Connect the test leads across the load to be measured.
4. Read the value on the display.

NOTE: Before measuring, disconnect the power supply of the circuit and fully discharge all capacitors. If the resistance value is greater than 1MΩ, the reading may take several seconds to stabilize, which is normal for high resistance measurements.

6.4 Continuity Test

To perform a continuity test:

1. Connect the black test lead to the "COM" jack and the red test lead to the "VΩ+" jack.
2. Set the Function/Range switch to the continuity (•))) range.
3. Press the "SELECT" button to select continuity test mode; the "•)))" symbol will appear as an indicator.
4. Connect the test leads across the load.
5. If the circuit resistance is lower than about 30Ω, the built-in buzzer will sound.

6.5 Diode Test

To perform a diode test:

1. Connect the black test lead to the "COM" jack and the red test lead to the "VΩ+" jack.
2. Set the Function/Range switch to the diode (▶|) range.
3. Press the "SELECT" button to select diode test mode; the "▶|" symbol will appear as an indicator.
4. Connect the red test lead to the anode of the diode and the black test lead to the cathode.
5. The meter will show the approximate forward voltage of the diode. If connections are reversed, "OL" will be displayed.

6.6 Capacitance Measurement

To measure capacitance:

1. Connect the black test lead to the "COM" jack and the red test lead to the "VΩ+" jack.
2. Set the Function/Range switch to the capacitance (∔) range.
3. Connect the test leads across the capacitor. Ensure correct polarity if applicable.
4. Read the value on the display.

NOTE: Before measuring, disconnect the power supply of the circuit and fully discharge all capacitors. If the capacitance value is greater than 1uF, the reading may take several seconds to stabilize, which is normal for high capacitance measurements.

6.7 Insulation Resistance Test

WARNING: The instrument can only measure the resistance of non-charged objects. Before measurement, disconnect the power supply of the circuit to be tested and fully discharge all capacitors. During the measurement process, the instrument outputs a high test voltage through the "INS" terminal. Do not come into contact with any exposed wires on the instrument, probes (including clips), or the object being tested, as this may cause electric shock.

1. Connect the black probe to the "INS-" terminal and the red probe to the "INS+" terminal.
2. Set the Function/Range switch to the desired test voltage range (100V, 250V, 500V, or 1000V). The screen will display "-----".
3. Connect the probes to the circuit to be tested.
4. Press and hold the "TEST" button. The instrument panel will begin testing. The screen displays the "⚡" symbol to indicate high voltage output, and "TEST" to indicate insulation resistance measurement.
5. Read the screen reading.
6. Release the "TEST" button to stop the measurement.

LOCK Function for Insulation Resistance: If the "LOCK" button is pressed once and then the "TEST" button is pressed again, the instrument will continue to measure insulation resistance until the "LOCK" button is pressed again.

7. Maintenance

7.1 Cleaning

Use a soft cloth and mild detergent to clean the surface of the meter. Do not use abrasive cleaners or solvents, as they can cause corrosion or damage.

7.2 Battery Replacement

Replace the batteries immediately when the low battery indicator appears on the display. Always turn off the meter and disconnect all test leads before opening the battery compartment.

7.3 Storage

If the meter will not be used for a long period, turn it off and remove the batteries to prevent leakage and potential damage.

8. Troubleshooting

• "OL" Display: This indicates an over-range condition. In manual range mode, select a higher range. For insulation resistance, it means the measured resistance exceeds the instrument's range.
• "Lo" Display: For insulation resistance, this indicates the measured resistance is less than or equal to 0.1MΩ.
• No Reading/Inaccurate Reading: Check battery level and replace if low. Ensure test leads are correctly connected and not damaged. Verify the function and range settings are appropriate for the measurement.
• No Buzzer Sound during Continuity Test: Ensure the circuit resistance is below 30Ω.
• Diode Test "OL": This indicates reversed connections or an open diode.

9. User Tips

• Always ensure the object being tested is not charged before performing any measurements, especially insulation resistance tests.
• For capacitance measurements, remember to short-circuit and discharge the capacitor before testing.
• If you require the instruction manual in a language other than English, please contact the seller or manufacturer for available translations.

10. Support

For technical assistance, troubleshooting beyond this manual, or warranty inquiries, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase.