Explanations Of Terms - Unitest Telaris 0751 Instruction Manual

The measurements used to check the electri-
cal safety must be performed in compliance
with the respectively valid standards and regu-
lations.

5.1 Explanations of Terms

Leakage Current:
The leakage current describes the current which
flows via the insulation of a UUT. This happens ei-
ther via the casing or via touchable, conducitve
parts, via the PE, or via additional earth connections
(e.g. antenna, water supply) of a UUT.
Contact surfaces:
A part of the instrument, when used appropriately:
• must come in physical (corporal) contact with the
patient, if required, so that the instrument can ful-
fill its function, or
• can be brought in contact with the patient, or
• must be touched by the patient.
Contact surface of type B:
A contact surface ensuring a protection against
electrical shock, in compliance with the require-
ments stipulated within VDE 0750/IEC 60601-1, in
particular when observing the admissible leakage
current. It is characterised by the symbol
NOTE: Contact surfaces of type B are not appropri-
ate for direct applications to the heart.
Contact surface of type BF:
A contact surface of type F allowing a superior pro-
tection against electrical shock in compliance with
the requirements stipulated in DIN VDE 0750/IEC
60601-1 than contact surfaces of type B and cha-
racterised by the symbol
NOTE: Contact surfaces of type BF are not appro-
priate for direct application to the heart.
Touch Current:
Here, a current measurement towards earth at
touchable, conductive parts of a UUT is performed.
The limit value in compliance with DIN VDE
0701/0702 amounts to 0.5 mA. The measurement
may be performed either directly or applying the dif-
ferential current procedure. The touch current
measurement will be performed for appliances of
protection class II, containing touchable, conduc-
tive parts or for appliances of protection class I,
which are equipped with touchable parts not con-
nected with the PE. The measurement must be per-
formed for both positions of mains plug.
The appliance UNITEST TELARIS 0701/0702
easy and the appliance UNITEST TELARIS
0701/0702 use the direct measurement proce-
.
dure for touch current measurement
Explanations of Terms
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