GMC-I Messtechnik GmbH
9
Notes Regarding Current Measurement:
•
The measuring circuit must be mechanically stable and
must be secured against accidental interruption. Select
conductor cross-sections and connectors such that no
overheating occurs.
•
An intermittent acoustic signal warns the operator if the
measured value exceeds the upper range limit in the
600 mA and 10 A measuring ranges.
•
Measuring ranges up to 600 mA are protected against
short-circuit current of up to 25 A with an FF 1.6 / 700 V
fuse link in combination with power diodes. The fuse has
a breaking capacity of 50 kA at a nominal voltage of
700 V and ohmic load.
•
The 6A and 10 A current measuring ranges are protected
with a 16 A / 600 V fuse link. The fuse has a breaking
capacity of 100 kA at a nominal voltage of 600 V and
ohmic load.
•
If one of the fuses blows, this condition is indicated at the
LCD as soon as a measured quantity with a voltage of
greater than 4 V is applied to the corresponding
connector jacks.The following symbol appears at the
digital display in this case:
.
•
If a fuse blows, eliminate the cause of overload before
placing the instrument back into service!
•
Refer to chapter 13 “Maintenance”, regarding fuse
replacement.
Zero Balancing
Δ
REL during Current Measurement
You can select the reference point in the mA AC / DC and
A AC / DC measuring range:
➭
Plug the measuring cables into the instrument and
connect the free ends to each other.
➭
After selecting the measuring range, briefly press the two
HOLD
and
MAN / AUTO
keys.
The instrument acknowledges zero balancing with an
acoustic signal and „0“ (
+
1 digit) and
Δ
REL appears at the
LCD, depending on the measuring range. The voltage
displayed at the moment the key is pressed is automatically
substracted from all subsequent measured values.
Zero balancing can be deleted:
–
by briefly pressing the
MAN / AUTO
key, which is
acknowledged with an acoustic signal,
–
by switching the instrument off.
FUNC
brief
Measuring Range:
mA
... 600 mA
000
.
0
mA
~
R
x
~
R
x
1
3
2
> 600 mA:
!
Current
DC
→
AC~
AC ~
→
DC
1x
mA
:
60 mA
…
600,0 mA
00
.
00
mA
DC
AC~
DC
AC~
... 60 mA
acoustic signal
acoustic
signal
