High Voltage Megohmmeter Insulation Tester 100V-15kV 50TOhm Digital Insulation Resistance Meter DAR PI | XHMR-5000A

The insulation resistance tester—also known as a megohmmeter or high-voltage insulation resistance tester—is used for measuring the insulation resistance of motors, transformers, cables, switchgear and other electrical equipment during preventive maintenance, commissioning and troubleshooting.

This industrial insulation resistance testing equipment supports insulation resistance test, voltage test, DC current test and capacitance test, with rated voltages from 100V to 15kV and insulation resistance measurement up to 50TΩ, providing reliable insulation diagnostics for transformers, motors, cables and wiring systems.

Insulation resistance measurement utilizes a voltage generator to generate a voltage (V), which is applied across the resistor under test. By measuring the current (I) flowing through the resistor, the resistance value (R) is calculated using the formula R = V/I. The higher the insulation resistance, the better the insulation condition of the equipment under test. Typical testing applications include:

• In all circumstances, special attention must be paid to safety when using this instrument.
• This instrument has been designed, manufactured, and tested in accordance with the IEC 61010 safety specifications.
• During measurements, do not use high-frequency signal generators—such as mobile phones—in the vicinity of the instrument, as this may introduce measurement errors.
• Pay close attention to the text and symbols displayed on the labels affixed to the instrument's casing.
• Before use, verify that the instrument and its accessories are in good condition; specifically, ensure that the insulation on the instrument and test leads is intact, with no exposed conductors or broken wires, before proceeding with measurements.
• During the measurement process, strictly avoid touching exposed conductors or the circuit currently being tested.
• Ensure that the connection plugs of the test leads are firmly inserted into the corresponding ports on the instrument.
• Do not perform measurements in flammable environments, as sparks generated during operation could trigger an explosion.
• If the instrument's casing or test leads become damaged—exposing internal metal components—while the unit is in use, immediately cease operation.
• Do not leave or store the instrument for extended periods in environments characterized by high temperatures, high humidity, condensation, or direct sunlight.
• When replacing the instrument's batteries, ensure that the test leads have been disconnected from the unit and that the instrument is powered off.
• If the instrument displays the "Low Battery Voltage" symbol, recharge the unit immediately; failure to do so may result in measurement inaccuracies.
• Strictly avoid performing charging or data transmission operations while a measurement is in progress.