MM750W-en-GB_v1.1 12/18
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PER IEC1010 OVERVOLTAGE INSTALLATION CATEGORY
OVERVOLTAGE CATEGORY I
Equipment of OVERVOLTAGE CATEGORY I is equipment for connection to circuits in which
measures are taken to limit the transient overvoltages 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
the fixed installation.
Note
–
Examples include household, office, and laboratory appliances.
OVERVOLTAGE CATEGORY III
Equipment of OVERVOLTAGE CATEGORY III is equipment in fixed installations.
Note
–
Examples include switches in the fixed installation and some equipment for industrial use
with permanent connection to the fixed installation.
OVERVOLTAGE CATEGORY IV
Equipment of OVERVOLTAGE CATEGORY IV is for use at the origin of the installation.
Note
–
Examples include electricity meters and primary over-current protection equipment
CAUTIONS
•
Improper use of this meter can cause damage, shock, injury or death. Read and understand
this user manual before operating the meter.
•
Always remove the test leads before replacing the battery or fuses.
•
Inspect the condition of the test leads and the meter itself for any damage before operating
the meter.
•
Use great care when making measurements if the voltages are greater than 25VAC rms or
35VDC. These voltages constitute a shock hazard.
•
Warning! This is a class
‘
A
’ device
. This equipment can cause residential radio signal
interference.
•
Always discharge capacitors and remove power from the device under test before
performing Diode, Resistance or Continuity tests.
•
Voltage checks on electrical outlets can be difficult and misleading because of the
uncertainty of the connection to the recessed electrical contacts. Use other means to
ensure t
hat the terminals are not ‘live’
.
•
Do not operate this device in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired.
•
Do not allow children or pets access to this device, its batteries and other accessories, or
the packaging materials.
•
If this device is going to be unused for an extended period, remove the batteries.
•
Expired or damaged batteries can cause cauterization on contact with the skin. Always use
suitable hand protection.
•
Do not short-circuit the batteries and do not dispose of batteries in fire.