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Gossen Metrawatt METRAHIT 30M Manual

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10 GMC-I Messtechnik GmbH
7 Current Measurement
Ð First disconnect supply power to the measuring circuit or the
load component, and discharge any capacitors which may
be present.
Ð Set the selector switch to “mA”.
After this selection has been made with the rotary switch, the
DC current mode is always active.
Ð Select the current type, either “DC” or “AC+DC”, which cor-
responds to the measured quantity by briefly pressing the
multifunction key. Double check for correct current type at
the LCD.
Ð Securely connect the instrument to the load component in
series as shown (without matching resistor).
Zero Balancing, see chapter 6.1, page 9
Current Measurement Tips:
• The instrument may not be used in power installations.
• The measuring circuit must be mechanically stable and pro-
tected against unintentional interruption. Conductor cross
sections and connection points must be substantial enough
to avoid excessive overheating.
• In the 100 mA measuring range, an intermittent acoustic sig-
nal warns you if the measurement value has exceeded the
measuring range upper limit value.
• The current ranges are protected by an internal 250 mA fus-
ible link. A defective fuse can only be replaced by GMC-I
Service GmbH service personnel.
The maximum permissible voltage for the measuring current
circuit is 600 V AC/DC in the „mA“ ranges.
–mA +
– (+) / ~
+ (–) / ~
max. 600 V !
L
… 10 …


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