5
Symbols and Terms in The Manual
Symbols :
: Caution, Risk of Danger.
Warning : Identifies hazardous conditions and actions that could cause
BODILY HARM or DEATH
Caution : Identifies conditions and actions that could DAMAGE the
meter or equipment under test.
: Fuse.
Terms :
CAT Level : Over Voltage Category Level defines at which circuit level masure-
ments may be safely made. Different category circuits have different high-voltage
transients.
PER IEC 1010 OVERVOLTAGE INSTALLATION CATEGORY OVERVOLTAGE
CATEGORY Ⅰ
Equipment of OVERVOLTAGE CATEGORY Ⅰ is equipment for connection to
circuits in which measurements are taken to limit the transient overvoltage to an
appropriate low level. Note examples include protected electronic circuits.
OVERVOLTAGE CATEGORY Ⅱ
Equipment of OVERVOLTAGE CATEGORY Ⅱ is energy consuming equipment
to be supplied from a fixed installation.
OVERVOLTAGE CATEGORY Ⅲ
Equipment of OVERVOLTAGE CATEGORY Ⅲ is equipment in fixed installa-
tions. Note examples include switches in a fixed installation and some equipment
for industrial use with permanent connection to the fixed installation.
OVERVOLTAGE CATEGORY Ⅳ
Equipment of OVERVOLTAGE CATRGORY Ⅳ is for use at the origin of the
installations. Note examples include electricity meters and primary over-current
protection equipment.
PER IEC1010 Pollution degree
POLLUTION
Addition of foreign matter, solid, liquid or gaseous (ionized gases), that may
produce a reduction of dielectric strength or surface resistively.
POLLUTION degree
For the purpose of evaluating spacing of this product, the following degrees of
POLLUTION in the microenvironment are defined.
Safety
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