Power Conversion Hipot / Safety Component Automated Systems

Guardian Multi-Channel Hipot Tester – 19020


Key Features

  • 10/4 channels in one design
  • 10 sets of sync output and measurement
  • AC/DC/IR 3 in 1 EST test
  • Master/Slave link – 10 units max.
  • Programmable V-output and limits
  • OSC (Open/Short Check)
  • Flashover detection
  • 1MΩ~50GΩ insulation resistance test
  • Standard RS-232 / Handler interface
  • Optional GPIB interface
  • Large LCD panel
  • Panel lockup function
  • Easy operating interface
  • CE Mark
  • High Efficiency Hipot Test Solution
  • 2-Year factory warranty


The Hipot test is one of the major test items in electrical safety testing. All electrical components and products including transformers, capacitors, power supplies, chargers and home appliances require hipot testing.

With more than 20 years experience in developing the instruments for test and measurement, Chroma created the Guardian 19020 multi-channel hipot tester with a brand new architecture. It can measure the hipot leakage current of all channels at the same time and conduct tests on up to 100 DUTs simultaneously.

The Guardian 19020 enables users to save space on the production line since there is no need to purchase multiple Hipot testers. Its one time multi-channel test can increase the efficiency of electrical regulatory testing. It improves productivity and reduces the risks of testing for products that require only hipot testing.

The Guardian 19020 also has powerful functions in Flashover detection and Open/Short Check. It contains several international patents and is the best tool for electrical regulatory hipot testing.

World’s First Sync Hipot Test (Patent Registered)

The Guardian 19020 comes equipped with the world’s first sync hipot test function. A single unit can perform 10 channels sync output and measurements simultaneously. Up to 10 units (master & slave) can be controlled simultaneously to have 100 channels in total. They can be grouped for output to avoid creating voltage difference due to adjacent tests as well as to improve productivity.

Synchronous Hi-Pot Test

One issue frequently encountered when testing multiple DUTs for Hipot is the lack of ability to synchronize the voltage output. When planning for production line or automation, minimized facility and optimized space are often utilized in the plant. This causes the distance between two DUTs to usually become very short. Using an output voltage 5kVac for example, if the output of the Hipot tester is not synchronized, the two DUTs may create a discharge of high voltage difference (up to14kV peak-peak) and cause the fixture to be damaged and create erroneous test results. The Chroma 19020 synchronizes the output signal so there is no high voltage difference on the adjacent two ends, this not only extends the life of production equipment but can also reduce the occurrence of misjudgment.

Flashover Detection

As with other Chroma EST Series scanners, the 19020 has a Flashover detection function. Flashover is the electrical discharge generated by a high electrical field inside or on the surface of insulation material that causes the DUT to lose its insulation characteristics and form a transient or discontinuous discharge. It can cause a carbonized conductive path within the insulation, or even damage the product under test. Flashover cannot be detected by monitoring leakage current only. The change rates of test voltage or leakage current are monitored to detect flashover as its detection is one of the most indispensable test items for electrical safety testing.

Open / Short Check (OSC)

The OSC function can check if there is any Open (bad connection) or Short (DUT short circuited) occurred during test. If a DUT is open circuit during test, the unit might be misjudged as a good one. If a DUT has short circuit, OSC function can filter it out to diminish the damage to fixture and save the test cost. In general, products under Hi-pot test have capacitance (CX). CX could be tens of pF to several µF under normal operating condition. When the circuit connection is interrupted, a small capacitance (Cc in Figure 6) will be formed on the broken interface that is usually lower than 10pF. It makes the entire capacitance of the product lower than normal value. The capacitance of a product may be higher than normal when the product is short-circuited or near short circuit. Thus the high/low limit of capacitance variation can be used to identify the short circuit problem.


Chroma 19020 can be applied to test various electrical parts and products. The multi-channel Hipot tester can test multiple DUTs at once. The applications include:

  • Automation of power cord and related cable material
  • Automation of capacitor and resistance
  • Insulation test of switch and connector
  • One time test for transformer with multiple pins or multiple units
  • Production planning for charger and adapter

With 190201 3-CH scanner, the 19020 can complete 3 Hipot tests at once.
Using a two winding transformer as an example, the following three Hipot tests can be done at once within a single DUT loading time.

  1. Primary to Secondary Hipot test.
  2. Primary to Core Hipot test
  3. Secondary to Core Hipot test.

This application can be applied to transformers, power adapters, common mode chokes and more.
For many test solutions, Chroma has accessories and fixtures available for use. Please contact us for further information.

Model Description
Guardian 19020 Multi-Channel Hipot Tester
Guardian 19020-4 Multi-Channel Hipot Tester (4CH)
19021 Multi-Channel Hipot Tester (AC)
19022-4 Multi-Channel Hipot Tester (DC/IR/4CH)
19022 Multi-Channel Hipot Tester (DC/IR)
A190508 GPIB Interface
A190200 19″ Rack mounting Kit for 19020
A190201 3-CH Scanner for 19020
A190202 3 Way Scanning Box (4 channel)

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