Manual

Gossen Metrawatt GmbH 49
8.15 Current Measurement
Attention!
!
Set up the measuring circuit in a mechanically secure
fashion, and secure it against inadvertent breaks. Select
conductor cross-sections and lay out connections such
that they do not overheat.
Note
In the case of current greater than 1.1 A, “OL” appears at
the display.
8.15.1 Direct and Pulsating Current Measurement, Direct Connec-
tion, – A DC and A (AC+DC)
➭ First disconnect supply power from the measuring circuit or
the power consumer (1), and discharge any capacitors.
➭ Set the rotary switch to A (A
).
➭ Repeatedly press the Func softkey until the desired measuring
function is displayed.
➭ If necessary, conduct zero balancing by pressing the Zero
softkey (see description below).
➭ Safely connect the measuring instrument (without contact re-
sistance) in series to the power consumer (2) as shown.
➭ Switch supply power to the measuring circuit back on (3).
➭ Read the display. Make a note of the measured value if the in-
strument is not being operated in the memory mode or the
transmission mode.
➭ Disconnect supply power from the measuring circuit or the
power consumer (1) once again, and discharge any capaci-
tors.
➭ Remove the test probes from the measuring point and return
the measuring circuit to its normal condition.
Improving Accuracy by means of Zero Balancing – Zero
The momentarily measured current value can be subtracted from
future measurements in all measuring ranges.
➭ Press the Zero softkey.
➭ The value ascertained for Zero is saved and appears above the
measurement display. Automatic compensation is imple-
mented for future measurements.
➭ The value for Zero is retained when the instrument is switched
to a different measuring function. The correction or offset value
is deleted by pressing Zero once again, or when the instrument
is switched off. The value is cleared from the display.
S– A
V
Tem p
m/4
COIL
S+
Func
Func
ADC
A(AC+DC)
AAC
Hz
Func
A
A
~
R
x
~
R
x
1
3
2
A: 10 nA ... 1 A
A:
10 nA ... 1 A
5 ranges:
A DC Measuring Range:
300 A / 3 mA / 30 mA /
300 mA / 1 A
A (AC+DC) Measuring Range:
5 ranges:
300
A / 3 mA / 30 mA /
300 mA / 1 A
Func
Current
Zero
Zero