Insulation & Continuity Testers (62 Products)

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  1. Extech CT20 Remote Local Continuity Tester Kit All Extech Products
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    Extech CT20 Remote & Local Continuity Tester
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    • Easy and quick local/remote continuity verification
    • Lightweight for hands-free attachment to wires
    • Bright flashing LED indicators and remote test probe
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    SKU: CT20
  2. Martindale TEK402 Continuity Tester - Kit All Martindale Products
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    Martindale TEK402 Continuity Tester with Audible Indication
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    • Built in continuity buzzer
    • Tough outside casing
    • Tests for voltage and current
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    SKU: MARTEK402
  3. Martindale TEK404 Audible Visual Continuity Tester - Kit All Martindale Products
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    Martindale TEK404 Audible & Visual Continuity Tester
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    • Audible and visual indicators
    • Safety measure included
    • Test leads and battery included in kit
    66 Reward Points
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    SKU: MARTEK404
  4. UNI T UT501A Insulation Resistance Tester All UNIT Products
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    UNI-T UT501A Insulation Resistance Tester
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    • Simple dial and push-button interface
    • Large LCD screen
    • Four jacks for testing
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    SKU: UT501A
  5. Extech MG310 Digital Insulation Tester Kit All Extech Products
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    Extech MG310 Digital Insulation Tester
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    • Compact and lightweight with included protective cover
    • Insulation resistance measurements up to 5.5GΩ
    • Also tests polarisation index and dielectric absorption ratio
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    SKU: MG310
  6. Extech 380320 Analogue Insulation Tester All Extech Products
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    Extech 380320 Analogue Insulation Tester
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    • Tests for both insulation and voltage
    • New Lock Power On function
    • Also detects and measures continuity, resistance and AC voltage
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    SKU: 380320
  7. UNI-T UT505A Handheld Insulation Resistance Tester All UNIT Products
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    UNI-T UT505A Handheld Insulation Resistance Tester
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    • Measure insulation resistance to 20.0GΩ
    • Selectable test voltages to 1000V
    • AC/DC voltage measurements to 600V
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    SKU: UT505A
  8. Extech 380260 Autoranging Digital Megohmmeter - Kit All Extech Products
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    Extech 380260 Autoranging Digital Megohmmeter
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    • Conducts insulation tests and voltage detection
    • Hands free operation possible with lock power on
    • Super large backlit dual display
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    SKU: 380260
  9. Metrel MI3103 GigaOhm Insulation & Continuity Tester - 1kV All Metrel Products
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    Metrel MI3103 GigaOhm Insulation & Continuity Tester - 1kV
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    • Insulation tests at 250, 500 and 1000V
    • 200mA continuity measurement
    • Portable, handheld design
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    SKU: MI3103
  10. Robin Amprobe KMP7036 Insulation Tester kit All Robin Amprobe Products
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    Robin Amprobe KMP7036 Insulation Tester
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    • 250V, 500V and 1000V ranges
    • Tests insulation of transformers, motors, cables and wires
    • Optimised to preserve user and instrument safety
    374 Reward Points
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    SKU: 3730274
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About Insulation & Continuity Testers

Insulation is a vital part of any electrical system. Correctly installed insulation ensures that current flowing through a system remains on the designated path it should be moving through and breakdowns in the overall insulation of a system can cause leakage current to flow, leading to problems and potential hazards.

The overall insulation of any system is susceptible to degradation over a time period. As standard the insulation of an electrical system or appliance should be solid enough to constrain as much leakage current as possible until the overall level is completely negligible, but many outside factors can affect the overall insulation over a time period, thus increasing the risk of higher levels of leakage current.

Parameters that can affect the overall amount of insulation present in a system vary greatly; everything from cuts in wiring, vibrations, pollution (corrosive materials) and even dust and dirt in the air can gradually erode away at insulative properties, effectively rendering them less useful over time.

Insulation test equipment is designed to effectively measure the level of insulation left on an electrical system. Knowing the overall level of insulation allows the tester to determine whether the insulation is still safe for use, or whether steps have to be taken immediately to make sure that the insulation is repaired to an acceptable level.

Common insulation testers are generally used to perform two different forms of electrical measurements. These measurements are obtained by testing between the conductors that carry current when energized and other parts of the system in which no current should ever flow under normal operating conditions. To gain an overall reading of the level of insulation resistance present two things must be measured: the actual leakage current flowing through the installation, and to measure the actual resistance of the insulation.

Insulation is also commonly measured to verify quality control of manufactured electrical devices, ensure electrical devices meet codes and standards (safety compliance), determine a device's performance over time (preventive maintenance) and determine causes of failure in troubleshooting scenarios. You can further classify insulation resistance testing into different testing types. These are:

  • Design testing
  • Production testing
  • Acceptance testing
  • Verification testing
  • Preventive maintenance testing
  • Fault locating testing

The actual type of insulation resistance tester needed to be used also varies on an application-by-application basis. Although standard ohmmeters commonly found on devices such as multimeters can be used to measure insulation, but these generally do not have the measurement range required to effectively determine insulation.

There are two main instruments that are used to measure insulation resistance - the first is the megohmmeter, a tester that's basically exactly the same as a standard ohmmeter but has a higher measurement range to accomodate for the needs of insulation. The second tester is known as a hipot tester, and these instruments measure insulation resistance by measuring leakage current. Hipot testers apply a high test voltage between two different conductors or between a conductor and ground and measure the leakage current. An excessive amount of leakage current (in apms) indicates a lower resistance or breakdown in insulation. Hipot tests almost always involve applying a test voltage that is several times higher than the specified operating voltage of the cable or device being tested.

Continuity Testing

Continuity testers are used to test for a complete flow path (open, broken, or closed) in any de-energized low-resistance application. They tie in with insulation testers, as broken continuity of a flow path generally means that current is being lost somewhere, which may be the result of a break in insulation levels.

In fact this type of tester is often integrated together into an insulation testing device, allowing users to carry out both testing types without the need to switch instruments. If you do prefer to operate with separate instruments both insulation and continuity testing devices are available as separate products as well.

Continuity testers can also contain integrated voltage measurement capability using two-pole probes.

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