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AC Power Sources

  • What is Power Factor?

    Power Factor is the ratio of the actual power of the alternating current as measured by a wattmeter to the apparent power as indicated by an ammeter and voltmeter. It can also be defined as the cosine of the phase angle between the voltage applied to the load and the current passing through it. Inductive and Capacitive loads will cause a phase shift in the current. A perfect power factor is 1:1.

  • What is True Power (WATTS)?

    True Power is the amount of work performed by an energy source over time. In AC circuits it takes into account non-sinusoidal wave shapes and leading and lagging current which are caused by reactive loads.

  • What is VA?

    The VA rating of the power supply pertains to the sizing of the power supply. The VA rating of the power source is the true RMS current multiplied by the true RMS voltage. It is also considered Apparent Power.

  • What are some advantages of a linear power supply?

    The linear supply offers low noise, low distortion and fast transient response but it is less efficient due to its larger size as well as being much heavier.


Agency Compliance Information

  • What is CE Marking?

    CE is the abbreviation of "European Communities" and symbolises to custom officials that the product marked complies with one or more relevant EC-Direction. The CE Marking applies to products regulated by certain European health, safety and environmental protection legislation.

  • Do standards differ by country?

    Safety standards do usually vary by country, especially between Europe and the United States. However, while many safety agencies are specifically founded and/or affiliated with certain countries, most are accepted by a variety of nations. For example, even though UL is the most popular electrical safety agency responsible for consumer products sold in the United States, many other countries have deemed UL listed products acceptable to sell within their own borders. Likewise, the United States accepts many products that are TÜV listed to be sold within our borders. Check with your local safety agency office for more information

  • What safety agency’s standards do I need to adhere to?

    This varies by product type and classification. You can call us here at EEC or your local safety agency office for information on the standards that apply to your product.

  • What is a standard?

    A standard is a set of test procedures that applies to a specific electrical product or category of products. Standards are used to verify that products meet basic requirements for safety, construction and durability.

  • What is a safety agency?

    Safety agencies are regulatory bodies that establish testing procedures called standards. They provide their seal of approval, known as an agency listing, to a product that meets their standards. In the United States, one of the most popular agencies is Underwriters Laboratories (UL), in Germany, TÜV Rheinland, in China, China Compulsory Certification (CCC).


Automation Testing

  • Do you provide automation software?

    Yes. EEC provides software solutions that work with many of our electrical safety testers. Our software allows you to create, store, and load test files as well as capture and record test data and results. Click here browse our Automation Software

  • What are the advantages of automating my testing procedure?

    Automation provides many advantages to all types manufacturers. Automating your test procedure can increase throughput and efficiency, allowing you to ship more product out the door in less time. Electrical safety testers with automation capability can be integrated into your previously existing testing apparatus, making upgrading equipment easier and more cost-effective. Automation allows you to record and store test results electronically, eliminating the need for paper storage systems and allowing you to search and filter easily through your results.


General Testing

  • What is a Class II appliance?

    Class II appliance: an appliance in which protection against electric shock does not rely on basic insulation only, but includes additional safety precautions such as double insulation or reinforced insulation.

  • What is the difference between a type test and a production line test?

    Electrical safety tests are loosely broken up into 2 separate groups, design or type tests, and routine production line tests. Design tests are usually performed for research purposes during the design phase of an electrical product. The information gathered from a design test is useful for finding potential problems with product design and development. Production line tests are usually required to be performed on 100% of the products leaving a facility for sale to consumers. A production line test helps to ensure a particular product is safe for consumer use.

  • Do safety test operators need any special training?

    We advise our customers that operators should have a working knowledge of electricity, safety and testing methodology. This can be accomplished in a number of ways including our educational programs and materials. Test operators do not need to be engineers or technicians but should have a basic understanding of the hazards involved in performing electrical safety tests.

  • What safety precautions should be taken during electrical safety testing?

    Working with high voltage instruments requires knowledge of electronics and basic safety practices in the workplace. Contact us for more information.

  • Do safety testers have the ability to test at multiple frequencies?

    Yes. Most electrical safety testers are capable of outputting both 50 and 60 hertz signals for use in the United States, Europe and Asia.

  • How do I determine what type of safety tester fits my application?

    It is generally helpful to know what agency specification you need to comply with and/or what your in-house testing specifications are. Whether you have this information or not our trained sales staff can help guide you to the correct instrument for your applications.

  • Who needs to perform electrical safety tests?

    Electrical safety testing has been implemented and enforced for one reason: to protect consumers from potentially fatal electric shock. These tests are performed to ensure that products, including anything from household electric coffee makers to hairdryers and computers meet industry standards for construction, performance, ratings, markings and instruction manuals. Not only do manufacturers want to prevent faulty components from being installed in their products, but they also want to catch workmanship defects in assemblies before installation. Following a proper safety testing procedure can help to identify production problems before a product is shipped preventing costly recalls and embarrassing public announcements. Still other manufacturers test to protect themselves from product liability suits. Whatever the reason may be, electrical safety testing makes good sense for any consumer product manufacturer.

  • What kinds of tests are considered electrical safety tests?

    There are 5 important electrical safety tests that manufacturers perform: the Dielectric Withstand (Hipot) test, Ground Bond test, Ground Continuity test, Insulation Resistance test, and the Line Leakage test.

  • What is electrical safety testing?

    Electrical safety testing is a general term used to describe the testing procedures a manufacturer's product must pass in order to be deemed safe to sell to consumers within specific countries. More often than not, regulatory agencies establish these compliance test procedures. They in turn provide their seal of approval, known as an agency listing, to a product that meets their standards.


Hipot Testing

  • What is a Hipot test?

    This test, also known as the Dielectric Withstand test, is used to stress the insulation of a product far beyond what it would encounter during normal operation. High voltage is applied from the mains-input lines to the chassis of the product for a specified length of time to check the integrity of the insulation by monitoring resulting leakage current. The Hipot test is a 100% production line test and can be performed using either an AC or a DC voltage.

  • What is a Hipot?

    A Hipot (which is an acronym for high potential) is a testing instrument used to verify the integrity of an electrical product's insulation.