User Manual

GMC-I Gossen-Metrawatt GmbH 41
V/Hz, Ω, Temperature, and A/Hz Measurements
5.7 Current Measurement
Notes Regarding Current Measurement
• The multimeter may only be operated with installed batteries or
rechargeable batteries. Dangerous currents are otherwise not
indicated, and the instrument may be damaged.
•
The METRAHIT ESPECIAL multimeter does not have a fuse for the cur-
rent measuring range. It’s designed for measurements in current
transformer circuits and is approved for measuring category 600 V
CAT II
.
• Set up the measuring circuit in a mechanically secure fashion, and
secure it against inadvertent breaks. Select conductor cross-sec-
tions and lay out connections such that they do not overheat.
• An intermittent acoustic signal warns of current greater than 10 A.
An continuous acoustic signal warns of current greater than 16 A.
• The input for the current measuring range is equipped with a fuse
link. Maximum permissible voltage for the measuring
circuit (= rated voltage of the fuse) is 1000 V AC/DC.
Use specified fuses only! The fuse must have a
breaking
capacity of at least 30 kA
.
• If the fuse for the active current measuring range blows, “ FUSE ”
appears at the digital display, and an acoustic signal is
generated at the same time.
• If a fuse should blow, eliminate the cause of overload before plac-
ing the instrument back into service!
• Fuse replacement is described in chapter 9.3.
• Be absolutely certain that the measuring ranges are not
overloaded beyond their allowable capacities. Limit values are in-
cluded in chapter 8, “Technical Data”, in the table entitled “Meas-
uring Functions and Measuring Ranges” in the “Overload
Capacity” column.
Scope of Functions, Current Measurement, Direct Connection
* ) Special model without fuse for measuring-current transformer
Scope of Functions, Current Measurement via Current Clamp Sensors
Scope of Functions for Current Measurement with Current Clamps Transformer
Function METRAHIT
E
XTRA
METRAHIT
E
TECH
METRAHIT
E
SPECIAL
METRAHIT
E
BASE
A AC / Hz ~ 600 μA
6/60/600 mA
6 A / 10 (16) A
60/600 mA
6 A / 10 (16) A
6 A / 10 (16) A
—
A AC+DC TRMS 600 μA
6/60/600 mA
6 A / 10 (16) A
60/600 mA
6 A / 10 (16) A
6 A / 10 (16) A
—
A DC 600 μA
6/60/600 mA
6 A / 10 (16) A
60/600 mA
6A / 10 (16) A
6 A / 10 (16) A
—
1000 V fuse
••—* ) —
Function METRAHIT
EXTRA
METRAHIT
ETECH
METRAHIT
ESPECIAL
METRAHIT
EBASE
Transformation
Factor
••••
A AC / Hz
••••
A AC+DC
••••
A DC
••••
Hz (A AC)
... 60 kHz ... 60 kHz ... 60 kHz ... 60 kHz
Function METRAHIT EXTRA METRAHIT ETECH METRAHIT ESPECIAL
Transformation Factor
•• •
A AC / Hz
•• •
Hz (A AC)
... 60 kHz ... 60 kHz ... 60 kHz