Please carefully read the following recommendations and instructions:

CAUTION

 Failure to comply with the notes and/or instructions may damage the

instrument and/or its components or be a source of danger for the

operator

 The red flashing “POWER” LED indicates that the internal rechargeable

batteries are almost flat. In this case, connect the external power supply

as described in § 7.2

 The IDC1, IDC2, IDC3 input connectors are type 4-pole type. Use only

clamps with 4-pin output connector or interpose adapter ACON3F4M

between the clamp output connector and the instrument input.

 The instrument maintains the data stored also in case of flat battery

 The instrument is particularly sensitive to ESD nearby and on the USB

port while it is operating; we recommend connecting the cables to the USB

port when the instrument is off

1.3. AFTER USE

When measurements are completed, turn off the instrument by pressing and holding the

ON/OFF key for some seconds. If the instrument is not to be used for a long time, please

follow the instructions given in § 3.4

1.4. DEFINITION OF MEASUREMENT (OVERVOLTAGE) CATEGORY

Standard “IEC/EN61010-1: Safety requirements for electrical equipment for measurement,

control and laboratory use, Part 1: General requirements” defines what measurement

category, commonly called overvoltage category, is. § 6.7.4: Measured circuits, reads:

Circuits are divided into the following measurement categories:

 Measurement category IV is for measurements performed at the source of the lowvoltage

installation

Examples are electricity meters and measurements on primary overcurrent protection

devices and ripple control units

 Measurement category III is for measurements performed on installations inside

buildings

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 fixed installation

 Measurement category II is for measurements performed on circuits directly

connected to the low-voltage installation

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

Examples are measurements on circuits not derived from MAINS, and specially

protected (internal) MAINS-derived circuits. In the latter case, transient stresses are

variable; for that reason, the standard requires that the transient withstand capability of

the equipment is made known to the user