During Use; After Use; Definition Of Measurement Category (Overvoltage) - Amprobe GP-2A Manual De Uso

1.2 During Use

You are recommended to read carefully the following instructions:
�CAUTION
Failure to comply with warnings and instructions may damage the instrument and/or its
components as well as injure the operator
If the low battery symbol is displayed during use interrupt testing and replace batteries
following the procedure described in paragraph 8.2
• Before selecting a new function disconnect the test leads from the circuit under test.
• When the instrument is connected to the circuit under test never touch any unused terminal.
• Do not measure resistance in the presence of external voltages; although the instrument is
protected, an excessive voltage may cause malfunction.
• Avoid submitting the instrument to voltage while measuring (i.e. a test lead slipping off the
measuring point accidentally touching an energized point).Unpacking And Inspection

1.3 After Use

• Turn off the instrument pressing ON/OFF key after using it.
• If you expect not to use the instrument for a long time remove the batteries.

1.4 Definition of Measurement Category (overvoltage)

The standards EN61010-1: Safety requirements for electrical equipment for measurement,
control and laboratory use, Part 1: General requirements, define what a measurement category,
usually called over voltage category, means. Under paragraph 6.7.4: Measuring circuits, it quotes:
Circuits are divided into the following measurement categories:
• Measurement category IV is for measurements performed at the source of a low-voltage
installation.
• Examples are electricity meters and measurements on primary excess current protection
devices as well as ripple control units. Measurement category III is for measurements
performed in the building installations.
• Examples are measurements on distribution boards, circuit breakers, wiring, including cables,
bus-bars, junction boxes, switches, socket-outlets in the fixed installations, and equipment
for industrial use as well as some other equipment, for example, stationary motors with
permanent connection to fixed installations. Measurement category II is for measurements
performed on circuits directly connected to the low voltage installations.
• 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 (internally)
protected MAINS-derived circuits. In this latter case, transient stresses are variable; for this
reason, the norm requires that the transient withstanding capability of the equipment is
made known to the user.
3