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Symbols
The following symbols are used on the current probe and in this manual.
WARNING – Risk of electric shock.
CAUTION – refer to accompanying documentation (this manual).
Damage to the instrument may occur if these precautions are ignored.
Do not apply around or remove from hazardous live conductors.
Application to hazardous live conductors acceptable.
Protected throughout by double insulation or reinforced insulation.
alternating current (ac).
direct current (dc).
Indicates Measurement Category II; the maximum voltage rating to earth for CAT II
CAT II
measurements is generally shown with the symbol. Measurement Category II
applies to measurements performed on circuits directly connected to the low-voltage
mains supply, e.g. portable equipment and appliances. CAT II does not include
measurements on distribution level circuits, e.g. distribution boards, circuit-breakers,
bus-bars, etc., or industrial installations, all of which are classified as CAT III.
Indicates Measurement Category I; the maximum voltage rating to earth for CAT I
CAT I
measurements is generally shown with the symbol. Measurement Category I
applies to measurements performed on circuits not directly connected to the low-
voltage mains supply. This category includes secondary circuits separated from the
mains circuits by a transformer and circuits derived from the mains supply in which
measures have been taken to limit transient over voltages to an appropriately lower
level. The maximum permitted transient overvoltage for the 600V CAT I rating of
this probe is 2500V.
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