Insulation resistance testers

The number of insulation resistance testers available on the market is large, and the amount of configurable features is overwhelming.

If you device under test run insulation tests on your device under test , a single test device is a good choice. It only contains the one test method insulation resistance."

If the device under test requires a more comprehensive safety and functional check, we recommend our multifunction testers.

The insulation resistance test (also known as the "IR" test) is used to determine the insulation resistance in measuring ranges from kΩ to TΩ. Many test specifications (e.g., VDE, EN, IEC, UL, etc.) stipulate the measurement and evaluation of insulation resistance.

Why insulation resistance testing is so important.

Washing machines, electric motor, lights... These and almost all other electrical products and electrical systems can only be operated safely if they have a high level of electrical insulation resistance.

In the worst case, poor insulation can lead to electrical accidents resulting in serious injury or even death, or cause significant damage to products. With the help of insulation test , you insulation test determine the insulation quality of your test object. Electrical products are tested with test voltages typically ranging from 500 to 1,000 V DC.

To insulation test almost all areas of insulation test , SCHLEICH offers SCHLEICH very comprehensive range of insulation testers from 25 V to 50,000 V DC.

Tests are performed between all live conductors and from live conductors to the housing. The insulation test always high voltage test between the same test connections as the high voltage test .

These faults are detected by the insulation resistance test.

• Insulation weaknesses between any electrical conductors and protective earth conductor
• Insulation weaknesses between electrical conductors
• Poor insulation at air and creepage distances

What are the good/bad criteria?

The insulation test always evaluated based on the ohmic insulation resistance TEST VOLTAGE between the two poles of the TEST VOLTAGE . This must not fall below an adjustable limit.

insulation test with DC.

The insulation test is alwaysTEST VOLTAGE insulation test aTEST VOLTAGE .

Why?

Test objects often have unavoidable capacitances due to filter capacitors or their physical design. Testing with AC voltage would have the disadvantage that these capacitances would cause a high capacitive leakage current . The actual resistance could not be determined with sufficient precision under such conditions. If, on the other hand, DC is used for testing, Capacitance plays Capacitance a minor role. After the Capacitance has been charged, only a very small insulation current Capacitance through the insulation resistance. The insulation resistance is calculated insulation resistance Ohm's law based on the applied voltage the flowing current.

This is how the insulation test is insulation test .

Whether manual, semi-automatic, or fully automatic: SCHLEICH insulation testers SCHLEICH all testing tasks to run quickly and efficiently.

They are all designed according to the "KISS principle." In other words, "Keep It Simple and Smart." This principle is the guiding principle for all SCHLEICH products.

Semi-automated or fully automated insulation testers or automatic testers provide more provide for production facilities. These are equipped with a relay switching panel (relay matrix). This TEST VOLTAGE switches the TEST VOLTAGE to the desired test points. Manual testing is performed using a test probe. To do this, the operator moves the test probe manually from test point to test point. Despite the manual process, the test can be documented perfectly. A typical application is the testing of electrical products, control cabinets, and machines in accordance with the EN 60204 machine directive.

Depending on the application, test systems of this type have up to 1,000 test connections.

Safe execution of the insulation test.

Working with high test voltages is not without risk. Therefore, the relevant safety regulations must be strictly observed. With SCHLEICH, the Test current is Test current limited. The integrated safety current limiter limits the Test current a maximum of 3 to 12 mA DC. This makes it possible to operate the insulation testers without test hoods.

However, a second criterion must also be taken into account:
Due to their design, many test objects have unavoidable Capacitance. During testing, this Capacitance is Capacitance and stores the charge. The maximum stored energy must not exceed 125 mJ (Q = 1/2 x C x U²). Otherwise, the operator couldResidual voltage a dangerous electric shock the residual chargeResidual voltage when touching the test object after the test.

If the test device is still device under test to the device under test after the test has been completed, the test device ensures safe discharge internally. However, if this cannot be reliably guaranteed, test hoods, test cabins, light curtains, or barrier chains are used as protective measures.

Potential-free insulation test?

In most applications, the potential-free insulation test is insulation test . It is typically used for test probes up to 1,000 V DC or for safety test guns up to 10,000 V DC. It ensures maximum safety the operator.

For high voltages of 15,000 V and above, TEST VOLTAGE , the TEST VOLTAGE is usually grounded on one side.

What insulation test you need to consider when performing an insulation test !

To perform the insulation test , it must be ensured that the device under test is device under test TEST VOLTAGE to the TEST VOLTAGE . There are two ways of monitoring contact to check that the test has been performed correctly:

• Specifying a charging current: This is advantageous for test objects that Capacitance between the test points. If TEST VOLTAGE measurable charging current flows during the switch-on of TEST VOLTAGE , you can be sure that the device under test is device under test connected to the test device.
• Measurement of voltage device under test applied to device under test : For this purpose, two additional sense lines are device under test to the device under test in addition to the test leads. This type of measurement is often referred to as a four-wire measurement. The TEST VOLTAGE device under test applied to device under test is TEST VOLTAGE via the two sense lines. This voltage compared with a specified value. This control procedure is therefore called voltage feedback measurement.

What insulation test can be measured with an insulation test ?

In addition to insulation test also possible to measure the PI (polarization index) or the DAR (dielectric absorption ratio). These are not typical safety test methods. However, they are often used for preventive maintenance.

The requirements for a standard insulation resistance tester.

Most national and international standards specify a TEST VOLTAGE 500 V DC. For this reason, many SCHLEICH have a variable TEST VOLTAGE 50 to 1,000 V DC.

They are typically equipped with a responsive electronic DC test voltage source. Depending on device , this device allows for the precise execution of voltage profiles.

SCHLEICH are based on over 30 years of experience. From the very beginning, digital rather than analog measurement technology has been used. Only the most advanced technologies are ever used.

How to find the right insulation resistance tester.

The number of insulation testers available on the market is large, and the amount of configurable features is overwhelming.

If you only run insulation tests, a single-test device is the right choice. It contains only one test method, namely the insulation test.

device under test , if the device under test also requires a more comprehensive safety and function check, we recommend our combination testers/multifunction testers. These allow various test methods, such as insulation, high voltage, and protective earth resistance test, to be conveniently device in one device . The test method switch in device that no test leads on device under test need to be device under test reconnected during the test.
In addition, the combination of safety tests and comprehensive functional tests is also very common. For function test , the test device device under test function test the device under test with electrical operating voltage in order to also check the electrical operating characteristics.

Thanks to the intuitive and convenient operation of our insulation testers, every test is quick, precise, and cost-effective.