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    Insulation Resistance Tester, 100V/250V/500V/1000V

    High accuracy insulation resistance tester with easy-to-read LCD display, offers test voltages of 100V/250V/500V/1000V, insulation resistance test range from 0.00 MΩ to 5.0 GΩ. This megger insulation tester supports AC voltage measurement of 30V~750V, idea for testing transformers, motors, cables and other electrical equipment.
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    🚚 Free shipping
    🔙 30-day returns
    📅 Delivery: 7-12 days

    sisco insulation resistance tester is a megohmmeter that offers insulation resistance test up to 5.0G ohm and test voltage of 100, 250, 500 and 1000 volts. Megger resistance tester is used for insulation resistance measurement in various kinds of electrical equipment such as transformer, electric motors, cables, switches, electrical appliance and so on.

    Insulation resistance tester external structure

    External structure

    1. EARTH: Insulation resistance test sampling jack
    2. G: Voltage measurement input negative jack
    3. V: Voltage measurement input positive jack
    4. LINE: High voltage output jack for insulation resistance tester
    5. Display LCD screen
    6. Backlit button
    7. Data hold button
    8. Insulation resistance measurement button
    9. Function button
    Insulation resistance tester with sturdy protective cover

    Megger resistance tester with sturdy protective cover

    When not measuring, the cover can be closed to protect the keys and screen of the insulation resistance tester.

    Insulation resistance tester with LCD display

    Insulation resistance tester with LCD backlight display

    The measurement data is displayed with functional symbols, the readings are clear at a glance and high-definition, and the data can be displayed in a backlight.


    The insulation resistance tester is suitable for measuring the insulation resistance of various electrical equipment and insulating materials such as transformers, motors, cables, switches, electrical appliances, and for maintenance, testing and verification of various electrical equipment.

    Insulation resistance tester application

    Model SISCO-IRT-UT501A
    Insulation Resistance (Ω) Test voltage/accuracy 100V/250V/500V/1000V 0% ~ 10%
    Measurement range/accuracy 100V 0.00 MΩ ~ 100 MΩ ±(3%+5)
    250V 0.00 MΩ ~ 99.9 MΩ ±(3%+5)
    100 MΩ ~ 5.0 GΩ ±(5%+5)
    500V 0.00 MΩ ~ 99.9 MΩ ±(3%+5)
    100 MΩ ~ 5.0 GΩ ±(5%+5)
    1000V 0.00 MΩ ~ 99.9 MΩ ±(3%+5)
    100 MΩ ~ 5.0 GΩ ±(5%+5)
    Load current 100V (R=100kΩ) 1mA 0% ~ 10% 
    250V (R=250kΩ) 1mA 0% ~ 10% 
    500V (R=500kΩ) 1mA 0% ~ 10% 
    1000V (R=1MΩ) 1mA 0% ~ 10% 
    Short-circuit current <2mA
    AC Voltage (V) Test range/accuracy 30V ~ 750V (50Hz/60Hz) ±(2%+3)
    Features Display 1999 count
    Auto ranging Yes
    Low battery indication Yes
    LCD backlight Yes
    Light alarm Yes
    Buzzer alarm Yes
    High voltage indication Yes
    Over load indication Yes
    Auto discharge Yes
    Test voltage secondary display Yes
    10 MΩ internal resistance test Yes
    General Power supply 1.5V battery (LR6) x 6
    Display size 70.6mm x 34mm
    Working condition 0℃ ~ 35℃, ≤75%RH
    Altitude ≤2000m
    Storage condition -20℃ ~ 60℃, ≤80%RH
    Product weight 500g
    Product size 150mm x 100mm x 71mm
    Standard accessories * Batteries, test leads, alligator clips, gallus

    Note: * Batteries are Not Included for air shippment.

    Insulation Resistance Tester Wiring Diagram

    500V megger insulation resistance test wiring diagram


    Q1: What is a insulation tester?
    Insulation tester, also known as megohmmeter or meggers, are widely used to measure cables for generators, motors, power transformers, wiring, appliances and other electrical installations such as control, signal, communication and power ) insulation resistance. They are often used in routine maintenance procedures to indicate changes in the insulation resistance of a motor over months or years. Large changes in insulation resistance may indicate potential failures. Therefore, regular calibration of the megohmmeter is required to ensure that the meter itself has not changed over time.

    Q2: What is insulation resistance?
    A2: Insulation resistance is the DC resistance of the insulation under the specified conditions, that is, the DC voltage is applied to the dielectric, after a certain period of polarization, the resistance corresponding to the leakage current flowing through the dielectric is called insulation resistance. It is the most basic insulation index of electrical equipment and electrical circuit.

    Q3: How to measure insulation resistance?
    A3: 1. Connect all the lines according to the method measured by the insulation resistance tester. The connection between the measuring lead and the pipe is more suitable for the use of magnetic joints or clips, and the connection point must be free of rust.
    2. The measuring instrument should be a 500V/500MΩ (the error here cannot be greater than 10%) insulation tester. Turn the handle of the megohmmeter to reach the specified speed for 10 seconds. The resistance value indicated by the megohmmeter stably is the insulation resistance value of the insulating joint (flange), which is required to be greater than 10 megohms.

    What are the functions of insulation resistance testers?

    1. Repair faulty parts
      Technicians use tests to verify high insulation resistance between conductors and ground or adjacent conductors. By testing the insulation resistance of different components in the system (transformers, switchgear, conductors, motors), technicians can isolate and repair failed components.
    2. Improve system performance
      Before energizing the system, verifying that it is sound using insulation testing can improve the performance of the system.
    3. Found manufacturing process problems and equipment defects
      Insulation testing can uncover manufacturing process problems and equipment defects that would not normally be discovered until the equipment fails. In the EU, the test is mandatory, even for the smallest civilian systems.

    Thank you for buying industrial test and measurement equipment on, all products sold by SISCO and the partner cover a 12 months warranty, effective from the date of receiving the products.

    What is covered?

    SISCO is responsible for providing free spare parts, and free technical support to assist the customer to repair the defective products until the problem is solved.

    What is not covered?

    • Product purchased from anyone other than a SISCO store or a SISCO authorized reseller.
    • Expendable parts.
    • Routine cleaning or normal cosmetic and mechanical wear.
    • Damage from misuse, abuse or neglect.
    • Damage from use of parts other than SISCO approved.
    • Damage from use outside the product’s usage or storage parameters.
    • Damage from use of parts not sold by SISCO.
    • Damage from modification or incorporation into other products.
    • Damage from repair or replacement of warranted parts by a service provider other than a SISCO authorized service provider.
    • Damage caused by the application environment not meeting the product usage requirements and the failure to perform preventive maintenance.
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