9 April 2020 : Inspecting Medical Equipment for Leakage Current – Hioki ST5540

During this global pandemic, the need for medical equipment such as ventilators cannot be overstated, and manufacturers all over the world are rushing to meet the demand. As with most electrical equipment, medical devices must also be tested for safety, especially since the devices often come into direct contact with the patient or healthcare worker.

IEC 60601-1 Ed. 3 is a widely accepted safety standard for medical electrical equipment. Part of the standard addresses patient leakage current, i.e., leakage current that flows through a patient connected to an applied part or parts. The Hioki ST5540 Leak Current HiTester was developed to meet the requirements for this particular testing application. Among the many features, the ST5540:

Leak Current Parameters For Medical-Use Electrical Devices : 

The ST5540 provides a single solution for measuring all these leak current variants.

Complies with IEC 60601-1:2005 +A1:2012 (Ed 3.1)

In order to prevent the danger of electric shock, electrical devices use power supplies that are isolated from parts of the device that may come into contact with the body. However, it is impossible to achieve infinite insulation resistance. Some leak current always exists, and its magnitude changes as the insulation degrades over time. The LEAK CURRENT HiTESTER ST5540 provides an easy-to-operate solution for measuring leak current in electrical devices, making it eminently suitable for use in an extensive array of applications, ranging from production lines to equipment maintenance and inspections.

Comparison of ST5540 Functionality
ST5540 vs General Use Electrical Devices

ST5540 Product Features

Model ST5540 comply with. IEC 60601-1:2005+A1:2012(Ed. 3.1), and IEC 62353 of 2017.

Compliance with Electrical Appliances and Materials Safety Act, JIS, IEC, and UL standards for general-use electrical devices.

The ST5540 can switch polarity without stopping the supply of power to the device under measurement. Old models require that the device under measurement be turned off and then back on again when switching polarity, but ST5540  let you progress smoothly to the next testing process.