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GMC-I Gossen-Metrawatt GmbH
13
GB
8
Resistance Measurement
➭
Be certain that the device under test is voltage-free. Extraneous
voltages distort the measurement results!
➭
Set the rotary switch to “
Ω
”.
➭
Connect the DUT as shown.
Zero Balancing in the 30
Ω
Measuring Range
Cable and transition resistance can be eliminated with zero balanc-
ing for measurements of small resistance values in the in 30
Ω
range:
➭
Connect the measurement cables to the instrument, and con-
nect the free cable ends to one another.
➭
Briefly press the multifunction key
FUNC
.
The instrument acknowledges zero balancing with an acoustic
signal and “
00
.
00
” (+1 digit) appears at the LCD with blinking
decimal point. The resistance which was measured at the
moment the key was activated serves as a reference value
(max. 200 digits). It is automatically subtracted from subse-
quently measured values.
Zero balancing can be deleted:
– by pressing and holding the multifunction key
FUNC
, after which
deletion is acknowledged with a twice repeated acoustic signal.
– by switching the instrument off.
See chapter 14 and chapter 15 for insulation resistance measure-
ment.
9
Alternating Current Measurement
with the WZ12B Clip-On Current Transformer
The rotary selector can be switched to the
position for mea-
surements with a clip-on current transformer. The measurement
value is displayed directly in A when the WZ12B clip-on transformer
is used.
➭
Read the operating instructions for the WZ12B.
➭
Turn the rotary switch to
and briefly press the yellow multi-
function key.
➭
Connect the measurement cables to jacks “
⊥
” and
.
Abbreviated Technical Data, WZ12B
Measuring Range
10 mA ... 100 A
Frequency Range
50 ... 500 Hz
Transformation Ratio
1 mV/10 mA
600V
V
F
°
C
b
j
a
600V
V
F
°
C
V
1M
M
1000V=ISO
R
x
Voltage Drop
Resistance Measurement
R
x
Voltage Drop
METRA HIT 16 I/L
METRA HIT 16 T