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1.2.
DURING USE
Please carefully read the following recommendations and instructions:
Failure to comply with the caution notes and/or instructions may damage
the instrument and/or its components or be a source of danger for the
operator.
• Before selecting a measuring function, disconnect the test leads from the circuit under
test.
• When the instrument is connected to the circuit under test, do not touch any unused
terminal.
• When connecting the cables, always connect the "COM" terminal first, then the
"Positive" terminal. When disconnecting the cables, always disconnect the "Positive"
terminal first, then the "COM" terminal.
• Do not apply a voltage exceeding 30V between the inputs of the instrument in
order to prevent possible damage to the instrument.
1.3.
AFTER USE
• When measurement is complete, press the
• If you expect not to use the instrument for a long period, remove the battery.
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:
(OMISSIS)
Circuits are divided into the following measurement categories:
• Measurement category IV is for measurements performed at the source of the low-
voltage 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.
CAUTION
key to switch off the instrument.
EN - 3
HT8051
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