User Manual

4
IEC Measurement Categories Definitions and Examples (Clause 6.5.2 ) PMT221A
Measurement Category I Definition: Measurement category I is for measurements
performed on circuits not directly connected to a
mains supply.
Examples: Measurements in circuits not derived from a mains
supply and specially protected ( internal ) circuits
derived from a mains supply. In the latter case,
transient stresses are variable; for that reason requires
that the transient withstand capability of the equipment
is made known to the user.
Measurement Category II Definition: Measurement category II is for measurements
CAT II performed on circuits directly connected to the
low voltage installation.
Examples: Household appliances, portable tools and similar
equipment.
IEC Pollution Degrees Definitions (Clause 3.5.6 )
Pollution Degree 2 Only- non conductive POLLUTION. Occasionally, however, a temporary
conductivity caused by condensation must be accepted.
IEC Safety Symbols
Caution, risk of danger. Refer to manual.
Caution, risk of electric shock.
Earth (ground) TERMINAL.