Glossary of Terms, Acronyms, and Definitions
LS 06311-002US Rev A
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Glossary of Terms, Acronyms, and Definitions
TERM
DEFINITION
AP
APPLIED PART: part of ME EQUIPMENT that in NORMAL USE necessarily comes into physical
contact with the PATIENT for ME EQUIPMENT or an ME SYSTEM to perform its function. [IEC
60601-1 #3.8]
DUT
Device Under Test which may be either the ESU or the SMART Tablet
ESU (RFG)
Electrosurgical Unit: Sonata Radiofrequency Generator.
I
A
Leakage current from the applied part. For the ESU (RFG) this consists of leakage from both
Handpiece signals and the Neutral electrode connections. For the SMART Tablet this consists of
leakage from the Sonata Intrauterine Ultrasound Probe.
I
P
Patient leakage is the current which flows to ground (PE) from the applied parts via the patient.
IN or IT
Isolated neutral (terre) describes a wiring system where the neutral line connection N is not
directly referenced to earth. Electrical Safety tester displays IT at top of display when IT
configuration is detected.
L
Line connection which is typically measures 230 ± 20 VAC to PE in an earth referenced neutral
wiring system. (TN)
LN
Line connection to DUT with normal polarity-L to L and N to N. Leakage currents are measured
with both normal and reversed polarity.
MAP
Mains on APPLIED PART: A method of assessing patient leakage current under the single fault
condition where MAINS VOLTAGE is present on the APPLIED PART.
MAINS PLUG
Part, integral with or intended to be attached to a POWER SUPPLY CORD of electrical
equipment, to be inserted into a mains socket-outlet. [IEC 60601-1 #3.50]
MSO
MULTIPLE SOCKET OUTLET: One or more socket-outlets intended to be connected to, or
integral with, flexible cables, cords or ME EQUIPMENT providing SUPPLY MAINS or equivalent
voltage. [IEC 60601-1 #3.67]
N
Neutral line connection which typically measures 0 V ± 15 VAC in an earth referenced neutral
wiring system. (TN)
NE (DE)
Neutral electrode (DE dispersive electrode) provides return path for HF energy from patient to
ESU (RFG)
NL
Line connection to DUT with reversed polarity. DUT N lead measures 230 ± 20 VAC to PE.
PE
PROTECTIVE EARTH. The PROTECTIVE EARTH CONDUCTOR is a conductor to be
connected between the PROTECTIVE EARTH TERMINAL and an external protective earthing
system. [IEC 60601-1 #3.93]
PET
PROTECTIVE EARTH TERMINAL: The PROTECTIVE EARTH TERMINAL is a terminal
connected to conductive parts of CLASS I equipment for safety purposes. This terminal is
intended to be connected to an external protective earthing system by a PROTECTIVE EARTH
CONDUCTOR. [SOURCE: IEC 60601-1:2005, 3.95]
TN
Terre neutral describes an earth referenced wiring system where the Neutral connection is
connected to earth.
R
INS
The insulation resistance includes two resistance measurements. Resistance is measured
between shorted mains L and N connections and the PE at the test socket. Resistance is
separately measured between the shorted mains L and N connections to the applied part
connections.
R
PE
Resistance between protective earth lead and the protective earth terminal in the ESU (RFG)
