Topic 4.4 Flashcards
What Does IEC Stand for?
International Electrotechnical Commission
What is Earth Leakage?
It is the current flowing down to to the earth through the ground conductor cord
What is Enclosure/Chassis Leakage?
It is the current that flows from to the Conductive Chassis part if you were to touch it
What is Applied Part Leakage?
Applied part is basically any device that is suppose to come in contact with patient. The APL is basically any leakage current that flows from applied part, between applied parts or into an applied part
What are the 3 types of applied part leakage test?
1) Patient Leakage Test
2) Patient Auxiliary Test
3) Mains on applied part Test
What is Patient Leakage current test?
It measures the current that flows between the applied part and the ground. (Using a reverse polarity switch and single fault of open neutral or open earth)
What is Patient Auxiliary Current Test?
It measures the current between a selected applied part and all other applied part. (Using the same condition of reverse polarity switch and single fault of open neutral or open earth)
What is Mains on Applied Part/ Lead Isolation Test?
it measures current flow in an isolated AC voltages applied between earth and selected applied part.
it uses mains supply with normal and reverse polarity and also a isolated voltage supply with mains and reverse polarity.
What is Chassis Ground Resistance/ Earth Continuity?
It is a test for 3 pin plugs to measure the power cord’s resistance and make sure that the resistance is low and effectively connected to the earth pin
What is Dielectric withstand?
It is a test to measure the strength of insulation by applying a high voltage between insulated parts to ensure that it can withstand high voltage for periods of time.
What is Residual Voltage Test?
It is a test that measures the voltage between 2 of the 3 pin plugs 1 second after it is disconnected from the socket and must be less than 60V or less than 2mJ to prevent accidental shock after unplugging.
What is Accessible parts voltage?
it is the voltage present between any part that can be accessed by the person and ground i.e. the chasing, switches, dials, knobs, buttons and etc.
What is Retained energy?
it is the energy stored in the accessible part. this test is only if you failed the accessible part voltage and is to verify that the energy is less than 2mJ
What is Current Draw?
it is the current consumed by the product. has to be within 10-25% of rating on equipment. The test is to measure the current that the product consume through the power cord.
What is Power Consumption?
it is the power consumed by the product and test cannot be 10-15% more than the power rating.
