ANENG MH15 Insulation Resistance Multifunctional Digital Meter User Manual

1. Introduction

This instrument is a battery-powered insulation resistance tester that can be used to measure DC voltage, AC voltage, resistance, audible continuity, diode, and insulation resistance. When measuring insulation resistance, there are four test voltages to choose from: 100V, 250V, 500V, and 1000V. This instrument has functions such as polarity indication, over-range indication, data retention, automatic retention, and other features. It is simple to use and is a precision measuring instrument.

This instrument has been designed according to EN61010-1 for electronic measuring instruments with an over-voltage category (CAT IV 600V & CAT III 1000V) and Pollution degree 2.

2. Safety Information

WARNING: To avoid possible electric shock or personal injury, and to avoid possible damage to the Meter or to the equipment under test, adhere to the following rules:

• Before using the Meter, inspect the case. Do not use the Meter if it is damaged or if the case (or part of the case) is removed. Look for cracks or missing plastic. Pay attention to the insulation around the connectors.
• Inspect the test leads for damaged insulation or exposed metal. Check the test leads for continuity.
• Do not apply more than the rated voltage, as marked on the Meter, between the terminals or between any terminal and grounding.
• The rotary switch should be placed in the right position, and no changeover of range shall be made during measurement to prevent damage to the Meter.
• When the Meter is working at an effective voltage over 60V in DC or 30V rms in AC, special care should be taken as there is a danger of electric shock.
• Use the proper terminals, function, and range for your measurements.
• Do not use or store the Meter in an environment of high temperature, humidity, explosive, inflammable, and strong magnetic fields. The performance of the Meter may deteriorate after being dampened.
• When using the 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 battery indicator appears. With a low battery, the Meter might produce false readings that can lead to electric shock and personal injury.
• Remove the connection between the testing leads and the circuit being tested, and turn the Meter power off before opening the Meter case.
• When servicing the Meter, use only the same model number or identical electrical specifications replacement parts.
• The internal circuit of the Meter shall not be altered to avoid damage to the Meter and any accident.
• Soft cloth and mild detergent should be used to clean the surface of the Meter when servicing. No abrasive and solvent should be used to prevent the surface of the Meter from corrosion, damage, and accident.
• The Meter is suitable for indoor use.
• Turn the Meter power off when it is not in use and take out the battery when not using for a long time. Constantly check the battery as it may leak when it has been used for some time; replace the battery as soon as leaking appears. A leaking battery will damage the Meter.

3. Product Overview & Panel Description

The ANENG MH15 is designed for ease of use with a clear LCD and intuitive controls. Below is a diagram identifying the key components and their functions.

1. Measuring voltage/resistor/capacitor/diode/buzzer, red dial positive input: The connection terminal for the red probe for most measurements, except for insulation resistance.
2. Black watch pen negative input: The connection terminal for the black probe for most measurements, except for insulation resistance.
3. Insulation resistance test Red gauge pen positive input terminal (INS+): Connection terminal for the red test lead during insulation resistance measurement.
4. Insulation resistance test Black gauge pen negative input terminal (INS-): Connection terminal for the black test lead during insulation resistance measurement.
5. LCD display: Digital display screen with analog segments.
6. BL (Backlight) button: Press to turn the screen backlight on or off.
7. HOLD button: Press to hold or release the current data reading.
8. RANGE button: Manually select the measurement range.
9. SELECT button: Used for function selection in multi-function measuring modes.
10. LOCK button: Used to lock or unlock the insulation resistance measurement function. If pressed once, then 'TEST' is pressed, the instrument will continuously measure until 'LOCK' is pressed again.
11. TEST button: Press and hold to start an insulation resistance measurement. Release to stop and hold the last value.
12. Function turntable: Used to select the desired function and turn the instrument power on or off.
13. Silicone sheath: Provides protection against drops and impacts.

4. Setup

4.1 Battery Installation

The ANENG MH15 requires 6 AA 1.5V batteries for operation. Batteries are not included in the package.

1. Locate the battery compartment on the back of the meter.
2. Open the battery compartment cover.
3. Insert 6 AA 1.5V batteries, ensuring correct polarity (+/-) as indicated inside the compartment.
4. Close the battery compartment cover securely.

4.2 Connecting Test Leads

Proper connection of test leads is crucial for accurate and safe measurements.

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

5. Operating Instructions

Before any measurement, ensure the meter is set to the correct function and range, and observe all safety precautions.

5.1 General Operation

• Power On/Off: Turn the function/range switch to the desired function to power on. Turn to 'OFF' to power off.
• Backlight: Press the 'BL' button to toggle the screen backlight.
• Manual and Automatic Ranging: The instrument defaults to automatic range (indicated by 'AUTO' symbol). Press the 'RANGE' button once to switch to manual range mode. In manual range, press 'RANGE' to cycle through higher ranges. Hold 'RANGE' for approximately 2 seconds to return to auto range.
• Data Hold: Press the 'HOLD' button once to lock the current reading (indicated by 'H' symbol). Press 'HOLD' again or switch to any function to release. Note that automatic hold is only applicable to insulation resistance tests where the measured resistance is greater than 0.1MΩ.

5.2 Measuring AC/DC 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=' (DC Voltage) or 'V~' (AC Voltage) range. Use the 'SELECT' button to switch between DC and AC voltage modes if needed.
3. Connect the test leads across the source or load to be measured.
4. Read the voltage value on the LCD display. For DC measurements, the polarity of the red lead connection will be indicated.

NOTE:

• To avoid electric shock or instrument damage, do not apply voltage greater than 750V AC or 1000V DC to the input terminal.
• In manual range mode, if the screen displays 'OL' during the measurement, select a higher range.

5.3 Measuring 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' (Resistance) range.
3. Connect the test leads across the load to be measured.
4. Read the resistance value on the display.

NOTE:

• When the resistance value is greater than 1MΩ, the reading may take several seconds to stabilize. This is normal for high resistance measurements.
• If the input terminal is open, the screen displays 'OL' as an over-range indicator.
• Before measuring, disconnect the power supply of the circuit being tested and fully discharge all capacitors.

5.4 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. Use the 'SELECT' button to ensure continuity test mode is selected.
3. Connect the test leads across the load to be measured.
4. If the circuit resistance is lower than about 30Ω, the built-in buzzer will sound.

5.5 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. Use the 'SELECT' button to ensure diode test mode is selected.
3. Connect the red test lead to the anode of the diode to be tested and the black test lead to the cathode.
4. The meter will show the approximate forward voltage of the diode. If the connections are reversed, 'OL' will be shown on the display.

5.6 Capacitance Measurement

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 under measure, ensuring polarity is observed.

NOTE:

• Before measuring, disconnect the power supply of the circuit being tested and fully discharge all capacitors.
• When the capacitance value is greater than 1µF, the reading may take several seconds to stabilize. This is normal for high capacitance measurements.

5.7 Insulation Resistance Measurement

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.

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 (i.e., '100V', '250V', '500V', or '1000V'). The screen will display '----'.
3. Connect the probes to the circuit to be tested.
4. Hold down the 'TEST' button. The instrument will begin testing. The screen displays the '⚡' symbol to indicate high voltage output, and 'TEST' to indicate insulation resistance measurement is in progress.
5. Release the 'TEST' button to stop the measurement and hold the final value.

NOTE:

• If the 'LOCK' button is pressed once and then the 'TEST' button is pressed again, the instrument will continue to measure the insulation resistance until the 'LOCK' button is pressed again.
• After the measurement stops, the measured object is discharged through the instrument. To avoid electric shock and personal injury, do not disconnect the probe from the tested object until it is completely discharged.
• During the measurement process, if the measured resistance exceeds the measurement range, the screen will display 'OL'. If the measured resistance is less than or equal to 0.1MΩ, it will display 'Lo'.

6. Specifications

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

• Display: 3 5/6 LCD, 6000 counts, updates 2-3/sec
• LCD size: 65 x 37mm
• Polarity Indication: '-' automatically displayed
• Over-range Indication: 'OL' displayed
• Low Battery Indication: Battery symbol displayed
• Range Select: Auto or manual
• Operating Temperature: 0°C to 40°C, ≤75%RH
• Storage Temperature: -10°C to 50°C, ≤80%RH
• Battery Type: 6 x AA 1.5V batteries
• Dimensions: 16.8cm (W) x 13.2cm (H) x 6cm (D)
• Weight: 419g (excluding batteries)

6.1 DC Voltage

Input impedance: 10MΩ
Max. input voltage: 1000V DC/750V AC rms

6.2 AC Voltage

Input impedance: 10MΩ
Frequency range: 40Hz ~ 400Hz, True-RMS
Max. input voltage: 750V DC/AC rms

6.3 Resistance

6.4 Capacitance

6.5 Insulation Resistance

Note: Minimum measurable resistance is 0.1MΩ.

6.6 Diode and Continuity

7. Troubleshooting

If you encounter issues with your ANENG MH15, refer to the following common troubleshooting steps:

• Meter not powering on or displaying correctly: Check battery installation and ensure batteries are not depleted. Replace with fresh AA batteries if necessary.
• Inaccurate or unstable readings: Ensure test leads are properly connected and not damaged. Verify the correct function and range are selected for the measurement. For high resistance or capacitance measurements, allow several seconds for the reading to stabilize.
• 'OL' displayed on screen: This indicates an over-range condition. If in manual range mode, select a higher range. For resistance or insulation resistance measurements, it may indicate an open circuit or a resistance value beyond the meter's maximum capability.
• 'Lo' displayed on screen (Insulation Resistance): This indicates the measured insulation resistance is less than or equal to 0.1MΩ, which is below the minimum measurable resistance for automatic hold.
• No buzzer sound during continuity test: This means the circuit resistance is higher than approximately 30Ω, indicating an open circuit or high resistance.
• 'OL' displayed during diode test: This typically means the test leads are reversed (anode/cathode) or the diode is open.
• Meter not responding to button presses: Ensure the meter is not in data hold mode (check for 'H' symbol). If the meter has been idle for 15 minutes, it may have entered auto power-off mode; press any button to wake it up.

8. Maintenance

Proper maintenance ensures the longevity and accuracy of your ANENG MH15.

• Cleaning: Use a soft cloth and mild detergent to clean the surface of the Meter. Do not use abrasive cleaners or solvents, as these can damage the casing and display.
• Battery Replacement: Replace the 6 AA batteries promptly when the low battery indicator appears to ensure accurate readings and prevent potential damage from battery leakage.
• Long-Term Storage: If the Meter will not be used for an extended period, remove the batteries to prevent leakage. Store the device in a dry environment, away from extreme temperatures, high humidity, and strong magnetic fields.
• Servicing: Only use identical replacement parts with the same model number and electrical specifications when servicing the Meter. Do not attempt to alter the internal circuit.

9. User Tips

• Always discharge capacitors before testing them to prevent damage to the meter and ensure safety.
• When measuring capacitance, you can select the range manually using the 'RANGE' button or let the meter operate in automatic ranging mode.
• The silicone sheath provides effective anti-drop protection, making the meter durable for various work environments.
• This meter is a must-have tool for electricians due to its multifunctional capabilities, including insulation resistance testing.

10. Warranty & Support

The accuracy of the ANENG MH15 is guaranteed for 1 year. For any technical support, warranty claims, or if the meter malfunctions, please contact ANENG customer service. Do not attempt to repair the device yourself if it is malfunctioning, as this may void the warranty and cause further damage.

A detailed user manual in PDF format is available for download from the seller's website for comprehensive information.