Instructions

Page 5
2 Safety
This multimeter has been designed to meet the requirements of EN61010-1, EN61010-2-030 &
EN61010-2-033 (relevant parts of the ‘Safety Requirements for Electrical Equipment for
Measurement, Control and Laboratory Use’ standards). It can be operated from its built-in
rechargeable battery or from a standard AC mains supply (Overvoltage Category II). When
connected to AC mains, it is a Safety Class I instrument.
WARNING! THIS INSTRUMENT MUST BE EARTHED
Any interruption of the mains earth conductor inside or outside the instrument will make the
instrument dangerous. Intentional interruption is prohibited. The protective action must not be
negated by the use of an extension cord without a protective conductor.
When operated from the internal battery, without an AC mains connection, the multimeter should be
earthed by connecting the rear panel Chassis Earth terminal to an external protective earth system.
Without this connection, ‘leakage’ current from any accessible part may exceed the Normal (safe)
limit of 0.5mArms under some extreme measurement conditions, e.g. high voltage, high frequency,
AC volts measurement. Measurements to 300VACrms, 50/60Hz, for example, would not require this
protective earth connection.
The test leads supplied with this instrument meet the requirements of EN61010-031 and are rated to
1000V Cat III; use only these test leads with the meter or a set of equivalent performance.
This instrument has been tested in accordance with EN61010-1 and has been supplied in a safe
condition. This instruction manual contains some information and warnings which have to be
followed by the user to ensure safe operation and to retain the instrument in a safe condition.
This instrument has been designed for indoor use in a Pollution Degree 2 environment (only dry
non-conductive pollution occurs except that occasionally a temporary conductivity caused by
condensation is expected) in the temperature range 5°C to 40°C, 20% - 80% RH (non-condensing).
It may occasionally be subjected to temperatures between +5° and −10°C without degradation of its
safety.
It has been designed for measurement use to 1000VDC/750VACrms in circuits isolated from AC
mains power (derived secondary circuits within an equipment) with occasional transient over-
voltages up to 1500Vpeak. It can also be used for CAT II (Measurement Category II) use to
600VDC/ACrms, and CAT III use to 300V DC/ACrms. CAT II is local domestic supply level, e.g.
portable equipment and appliances; CAT III is mains distribution parts of a building.
For this equipment 4000V is the maximum peak transient overvoltage that can be tolerated by any
terminal with respect to earth ground without impairing safety.
Use of this instrument in a manner not specified by these instructions may impair the safety
protection provided. Do not operate the instrument outside its rated supply voltages or
environmental range. In particular excessive moisture may impair safety.
When the instrument is connected to its supply or its inputs are connected to live voltages, terminals
may be live and opening the covers or removal of parts (except those to which access can be
gained by hand) is likely to expose live parts. The apparatus shall be disconnected from all voltage
sources before it is opened for any adjustment, replacement, maintenance or repair, including the
replacement of the current range protection fuses. Any adjustment, maintenance and repair of the
opened instrument under voltage shall be avoided as far as possible and, if inevitable, shall be
carried out only by a skilled person who is aware of the hazard involved.
If the instrument is clearly defective, has been subject to mechanical damage, excessive moisture or
chemical corrosion the safety protection may be impaired and the apparatus should be withdrawn
from use and returned for checking and repair. Make sure that only fuses with the required rated
current and of the specified type are used for replacement. The use of makeshift fuses and the
short-circuiting of fuse holders is prohibited.
Do not wet the instrument when cleaning it and in particular use only a soft dry cloth to clean the
display window.