1. Introduction The insulation resistance tester—also known as a megohmmeter,
high-voltage insulation resistance tester, etc.—is used for
measuring insulation resistance. 2. Voltage Ranges and Accuracy | Measurement Function | Measurement Range | Accuracy | Resolution |
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| DC Voltage | DC 0.0V – 1000V | ±1.5% rdg ±3 dgt | 0.1V | | AC Voltage | AC 0.0V – 750V | ±1.5% rdg ±3 dgt | 0.1V |
3. Technical Specifications | Functions | Insulation Resistance Test, Voltage Test, DC Current Test,
Capacitance Test | | Reference Conditions | 23°C ±5°C, <75% RH | | Rated Voltage | 100V, 250V, 500V, 1000V, 2500V, 5000V | | Insulation Resistance Range | 0.01 MΩ – 10 TΩ | Resolution: 0.01 MΩ | | Rated Voltage | 250V, 500V, 1000V, 2500V, 5000V, 10 kV | | Insulation Resistance Range | 0.01 MΩ – 35 TΩ | Resolution: 0.01 MΩ | | Rated Voltage | 500V, 1000V, 2500V, 5000V, 10 kV, 15 kV | | Insulation Resistance Range | 0.01 MΩ – 50 TΩ | Resolution: 0.01 MΩ | | Measurement Voltage (V) | Rated Voltage × (1 ±10%) | | DC Voltage Range | 0 – 1000V | Resolution: 0.1V | | AC Voltage Range | 0 – 750V | Resolution: 0.1V | | DC Current | 0.1 nA – 6 mA | Resolution: 0.1 nA | | Capacitance | 10 nF – 50 µF | Resolution: 10 nF | | Output Short-Circuit Current | ≥6 mA @ 15 kV | | Absorption Ratio (DAR) and Polarization Index (PI) Measurement | Supported | | Power Supply | 12.6V Rechargeable Lithium Battery | | Backlight | Supported Controllable gray-white screen backlight, suitable for
use in dimly lit environments. | | Display Mode | 4-digit extra-large LCD display with gray-white screen backlight. |
4. Measurement Principle 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. Safety Precautions - 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.
- In all circumstances, special attention must be paid to safety when
using this instrument.
- 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.
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