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AC Clamp-on Meter Model CM 660 / CM 670 / CM 685
CHAPTER 4
OPERATION
4.1 Preparation Before Use
For your own safety and to prevent damage to the instrument, you
must follow the instructions given in this manual.
This instrument can be used for measurements:
• on circuits in installation category II, in an environment with pol-
lution level 2, for voltages no greater than 600V in relation to the
earth.
• or on circuits in installation category III, in an environment with
pollution degree level 2, for voltages no greater than 300V in
relation to the earth.
Denition of the installation categories (see IEC 61010-1 publication):
CAT II: CAT II circuits are household or similar appliance power circuits,
which may carry medium-level transient over-voltage.
Example: household appliance and portable tool power supplies
CAT III: CAT III circuits are high-power appliance power circuits, which
may carry high-level transient over-voltage.
Example: industrial machinery or instrument power supplies
For your own safety, only use leads that comply with the IEC/EN 61010.
Before using them, always check that they are in perfect working order.
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