Synchronized Hipot Tester Measures Up To 100 Channels Simultaneously

February 4, 2013. Chroma Systems Solutions, a provider of electrical power test equipment and systems, announces the release of its new 19020 Series Multichannel Hipot tester. A new architecture enables the 19020 Multichannel Hipot tester to measure hipot leakage current of all channels at the same time and to conduct tests on a maximum of 100 DUTs simultaneously, increasing regulatory test efficiency and productivity.

The 19020 incorporates a synchronous hipot test function that allows one single unit to perform 10 channels of sync output and measurement at the same time. A maximum of 10 units can be controlled for 100 channels in total. They can be grouped for output to avoid creating voltage differences.

Chroma’s 19020 synchronizes the output signal, removing risk of high voltage differences on adjacent DUTs and minimizing any occurrence of error in the test. Taking 5-kVAC output voltage as an example, when the output of a hipot tester is not synchronized, two nearby DUTs may experience a voltage difference of up to 14 kV peak-to-peak, causing damage to the fixture and erroneous test results.

Through its I/O interface, test results are reported individually and collectively simultaneously. The 19020 offers memory recall for easy implementation in automated environments, allowing recall of the first seven memory locations. The system can provide individual test results from CH1 to CH10 as well as a general PASS/FAIL result, making it simple to use with a PLC.

Chroma’s 19020 also has flashover detection and open/short check (OSC) functions. Flashover is the electrical discharge generated by a high electric field inside or on the surface of insulation material that makes the DUT lose its insulation characteristic and form a transient or discontinuous discharge. Flashover can cause a carbonized conductive path and damage to the DUT. Flashover cannot be detected by monitoring leakage current only. The 19020 monitors change rates of test voltage or leakage current to detect flashover. The OSC function checks if any open (bad connection) or short occurred during the test. If the DUT has an open circuit during testing, a bad unit might be mistaken for a good one. If the DUT has short circuit, the OSC function filters it out to reduce damage to the fixture.

The Chroma 19020 Multichannel Hipot tester can be used in various applications where testing multiple DUTs at once benefits productivity such as quality assurance, sampling, and production line testing. Applications include automation of power cord and related cable materials test, automation of capacitor and resistance test, insulation test of switches and connectors, one-time test for transformers with multiple pins or multiple units, and production planning for chargers and adapters. With the 190201 3-CH scanner added, the 19020 can complete three hipot tests at one time. For example, for a two-winding transformer test the following three hipot tests can be performed on one DUT: primary to secondary, primary to core, and secondary to core.

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