Protective conductor resistance testers

Electrical products are typically connected to the mains power supply via power cables with mains plugs or connection terminals. The protective conductor test therefore protective conductor test between the PE of the mains plug orconnection clamp all associated metal housing parts of the electrical product.

If several metal parts of the enclosure of an electrical appliance are protective earth conductor to the protective earth conductor , the safe functioning of the protective conductor must be verified individually for each part of the enclosure. If protective conductor connections are no longer accessible on the fully assembled electrical appliance, these protective conductor connections must be tested during intermediate inspections during production.

These faults are protective conductor test by the protective conductor test .

• Interrupted protective earth conductor
• protective earth conductor with too high impedance, poor contact resistance
• Loose connections or poor clamping points on the protective conductor

How is the protective earth conductor ?

In most cases, the protective conductor is tested on the basis of the measuredohmic resistance. Alternatively, the voltage drop protective earth conductor the protective earth conductor can also be measured.

To determine the resistance or voltage drop, a high minimum test current must protective earth conductor through the protective earth conductor , depending on the test standard. The test device sets the test current to the specified level and regulates it to a constant value.

The high Test current simulate a load on the protective conductor in order to "burn away" any weak transitions that may be present. However, with typical test times of one second, this is usually not possible in reality, as it is hardly possible for the contact to heat up to the point of burning away in this time.

For precise protective conductor testing, four-wire technology (also known as Kelvin measurement, 4L, or 4W) is extremely important. Only with this technology is it possible to reliably and precisely measurement smallresistances inspace. Using four-wire technology , the test device determines four-wire technology voltage drop across the protective earth conductor protective conductor resistance the protective conductor resistance based on Ohm's law.

The "good/bad" criteria.

Standards define upper limits for ohmic resistance or voltage drop. These limits must not be exceeded under any circumstances.

protective conductor test AC or DC?

In most cases, the Test current alternating current. However, in some applications, for example with long coiled connection cables, direct current can also be advantageous.

This is how the protective conductor test is protective conductor test .

Whether manual, semi-automatic, or fully automatic: with protective conductor testers from SCHLEICH , every test task SCHLEICH be run quickly and efficiently.

All of our testing devices are designed according to the "KISS principle." In other words,"Keep It Simple and Smart." This principle is the guiding principle for all SCHLEICH products!

A manual test is performed using a protective conductor test probe. The operator moves the test tip from test point to test point. Despite the manual process, the test can be documented perfectly. A typical application here is the testing of electrical products, control cabinets, and machines in accordance with the EN60204 Machinery Directive.

Partially or fully automated protective conductor testers or automatic protective conductor testers provide for the requirements of production facilities. For this purpose, the testers are equipped with a relay switching panel (relay matrix). These automatically switch the test currents to the desired test points.

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

The requirements for a standard protective conductor tester.

Many national and international standards requiretest currents between 10 and 30 A. These test currents can be set in stages in the test device. In addition SCHLEICH supplies protective conductor test devices from1 A to 500 A AC/DCTest current.

SCHLEICH are based on over 30 years of experience. From the very beginning, the measurement technology was not analog, but always digital. Only the most modern technologies are used.

How to find the right protective conductor tester.

There are many protective conductor testers available on the market, and the number of configurable features is overwhelming.

If you device under test  run protective conductor tests with AC or DC on your device under test , a single test device is a good choice. It only contains the one test method protective conductor resistance."

If the device under test requires a more comprehensive safety and function check, we recommend our combination testers/multifunction testers. These allow various test methods, such as protective earth conductor, insulation, and high voltage test , to be high voltage test combined in a single test device. The fully automatic test method switching integrated in the test device ensures that no test leads on device under test need to be reconnected manually device under test the test.

In addition, a combination of safety tests and extensive functional tests is also 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 SCHLEICH protective conductor resistance testers, every test SCHLEICH quick, precise, and cost-effective.