1. GENERAL INSTRUCTIONS
This instrument complies with IEC 61010-1, CAT. III 1000V
and CAT.Ⅳ 600V overvoltage standards. See Specifications.
To get the best service from this instrument, read carefully
this user's manual and respect the detailed safety
precautions.
International symbols used on the Meter and in this manual
are explained in chapter 1.1.3
1.1 Precautions safety measures
1.1.1 Preliminary
* Measurement category Ⅳ meters are designed to protect
against transients from the primary supply level (overhead
or underground utilityservice).
* Measurement category III is for measurements performed
in the building installation.
NOTE: Examples are measurements on distribution boards,
circuit-breakers, wiring, including cables, bus-bars, junction
boxes, switches, socket-outlets in the fixed installation, and
equipment for industrial use and some other equipment, for
example, stationary motors with permanent connection to
the fixed installation.
* Measurement category II is for measurements performed
on circuits directly connected to the low voltage installation.
NOTE: Examples are measurements on household
appliances, portable tools and similar equipment.
* Measurement category I is for measurements performed on
circuits not directly connected to MAINS.
NOTE: Examples are measurements on circuits not
derived from MAINS, and specially protected (internal)