GMC-I Gossen-Metrawatt GmbH 7
GB
Observe the following safety precautions:
• The instrument may only be operated by persons who
are capable of recognizing contact hazards and taking
the appropriate safety precautions. Contact hazards
exist anywhere, where voltages of greater than 33 V may
occur (effective value).
• Avoid working alone when taking measurements which
involve contact hazards. Be certain that a second person
is present.
• The maximum allowable voltage
between the jacks (7) and earth
is 1000 V for category III and 600 V for category IV
Exception METRA HIT 23S: 1000 V Categorie II only.
• Nominal line voltage may not exceed the following values:
– Between conductor and neutral: 600 V
– 690 V between phase conductors in 4-wire 3-phase
systems
– 1000 V between phase conductors in 3-wire 3-phase
systems.
• Be prepared for the occurrence of unexpected voltages
at devices under test (e.g. defective devices). For exam-
ple, capacitors can be dangerously charged.
• Make certain that the measurement cables are in flaw-
less condition, e.g. no damage to insulation, no interrup-
tions in cables or plugs etc.
• No measurements may be made with this instrument in
electrical circuits with corona discharge (high-voltage).
• Special care is required when measurements are made
in HF electrical circuits. Dangerous pulsating voltages
may be present.
• Measurements under moist ambient conditions are not
allowable.
• Be absolutely certain that the measuring ranges are not
overloaded beyond their allowable capacities. Limit val-
ues can be found in the table “Measuring Ranges” in
chapter 24 “Characteristic Values”.
• All current ranges are equipped with fuses, except for
METRA HIT 23S (which has no 16 A fuse in the 3 und
16 A measuring ranges).The maximum permissible
voltage of the measuring circuit (= nominal voltage of the
fuse) is 1000 V AC/DC in the „mA“ and „A“ ranges.
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