Manual

52 Gossen Metrawatt GmbH
8.15.4 Alternating Current Measurement with Current Clamp
Sensor – AAC and Hz
Voltage/Current Transformer Output
When a current clamp sensor is connected to the multimeter
(V input), all current displays appear with the correct value in
accordance with the selected transformation ratio. The only pre-
requisite is that the current sensor is equipped with at least one of
the below listed transformation ratios, and that the ratio has been
previously selected in the following menu (Clip Off).
➭ Set the rotary switch to V~ or Hz.
➭ Press the MENU key.
➭ Press the “Setup for present measurement” softkey.
➭ Set the Clip parameter to the desired transformation ratio (the
same ratio as selected at the current clamp sensor) as de-
scribed below in the current clamp settings menu, or select
the desired transformation ratio with the  scroll keys.
➭ The display is returned to the measurement view by pressing
the ESC key three times.
➭ Repeatedly press the Func softkey until the desired measuring
function is displayed.
➭ Connect the current clamp sensor’s measurement cables as
shown.
➭ If necessary, conduct zero balancing by pressing the Zero key
(see description below).
Current Clamp Setup Menu
> Setup for present measurement  Clip
Off / 1:1 / 1:10 / 1:100 / 1:1000

3 x > Measurement View
The maximum allowable operating voltage is equal to the nominal
voltage of the current transformer.
When reading the measured
value, additional error resulting from the current clamp sensor must
also be taken into consideration
(default setting: Clip = Off = voltage
display).
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 correction or offset value is deleted by pressing Zero, by
changing to another measuring function or by switching the in-
strument off. The value is cleared from the display.
Transformation Ra-
tio
Measuring Ranges Clamp Type
300 mV 3 V
1:1
1m V/1 mA
300.0 mA 3.000 A
METRAFLEX 300M
WZ12C,
Z3512A
1:10 AM
1m V/10 mA
3.000 A 30.00 A
CP30,
METRAFLEX 3000/300M
WZ11B, WZ12B,
Z3512A
1:100
1m V/100 mA
30.00 A 300.0 A
CP330/1100/1800
METRAFLEX 3000/300M,
WZ11B, Z3512A
1:1000
1m V/1 A
300.0 A 3,000 kA
CP330/1100/1800
METRAFLEX 3000,
WZ12C, Z3512A
MENU
OK
OK
ESC
S– A
V
Tem p
m/4
COIL
S+
Func
Func
AAC
Hz (A)
V~
Hz
~
R
x
Current
R
i
R
i
~ 9 M
mA/A: see Table
Measuring Ranges:
Measuring Ranges:
Hz: 300 Hz/3 kHz/
Hz: 30 kHz / 300 kHz
Clip  Off
Zero