AEMC 6422 User Manual page 5

Precautions
This instrument is compliant with safety standard IEC 61010-2-030 for voltages
up to 600V in category IV. Do not use the instrument for measurements on
circuits that are not in measurement categories II, III, or IV or that might be
connected inadvertently to circuits that are not in measurement categories II, III,
or IV.
The operator and/or the responsible authority must carefully read and

clearly understand the various precautions to be taken in use. Sound
knowledge and a keen awareness of electrical hazards are essential
when using this instrument.
If you use this instrument other than as specified, the protection it

provides may be compromised, thereby endangering you.
Do not use the instrument on networks of which the voltage or category

exceeds those mentioned.
Do not use the instrument if it seems to be damaged, incomplete, or

poorly closed.
Before each use, check the condition of the insulation on the leads,

housing, and accessories. Any item of which the insulation is
deteriorated (even partially) must be set aside for repair or scrapping.
Before using your instrument, check that it is perfectly dry. If it is wet, it

must be thoroughly dried before it can be connected or used.
The use of leads (or accessories) of a lower voltage or category limits the

voltage or category of the combined instrument and leads (or
accessories) to that of the leads (or accessories).
Use personal protection equipment systematically.

When handling the leads, test probes, and alligator clips, keep your

fingers behind the physical guard.
All troubleshooting and metrological checks must be performed by

competent and accredited personnel.
Definition of Measurement Categories (CAT)
CAT IV Measurement category IV corresponds to measurements taken at the
source of low-voltage installations.
Example: power feeders, counters and protection devices.
CAT III Measurement category III corresponds to measurements on building
installations.
Example: distribution panel, circuit-breakers, machines or fixed
industrial devices.
CAT II Measurement category II corresponds to measurements taken
on circuits directly connected to low-voltage installations.
Example: power supply to domestic electrical appliances and
portable tools.
Ground Tester Models 6422/6424
5