40 GMC-I Messtechnik GmbH
15 Measurement with Accessory Sensors
15.1 Measuring Current with a Current Sensor Clamp
Biasing, leakage and circulating current up to 1 A, as well as
leakage current up to 1000 A can be measured with the help of
special current sensor clamps, which are connected to sockets
(15) and (16).
Danger: High-Voltage!
Use only current sensor clamps which are specifically
offered as accessories by GMC-I Messtechnik GmbH.
Other current sensor clamps might not be terminated
with an output load at the secondary side. Dangerously
high voltage may endanger the user and the device in
such cases.
Maximum input voltage at the test instrument!
Do not measure any currents which are greater than
specified for the measuring range of the respective
clamp. Input voltage for clamp connector sockets (15)
and (16) at the test instrument may not exceed 1 V!
Read and adhere strictly to the operating instructions for
the current clamp sensors, as well as the safety
precautions contained therein, in particular with
reference to the approved measuring category.
Select the Measuring Function
Selecting a Measuring Range at the Current Sensor Clamp
Set Parameters
The transformation ratio parameter must be correspondingly set
at the test instrument depending upon the respectively selected
measuring range at the current sensor clamp.
Connection
Start Measurement
Tester Clamp Tester
Transform.
Ratio
Parameter
WZ12C
Switch
Z3512A
Switch
WZ12C
Measuring
Range
Z3512A
Measuring
Range
Measuring
Range
1:1
1 V / A
1 mV / mA
x 1000 [mV/
A]
1 mA... 15 A 0 ... 1 A 5 ... 999 mA
1:10
100 mV / A
— x 100 [mV/A] — 0 ... 10 A 0.05 ... 10 A
1:100
10 mV / A
— x 10 [mV/A] — 0 ... 100 A 0.5 ... 100 A
1:1000
1 mV / A
1 mV / A x 1 [mV/A] 1 A ... 150 A 0 ... 1000 A
5 ... 150 A/
999 A
Test Instru-
ment
Clamp Sensor Test Instrument
Transformer
Ratio
Parameter
Switch
METRAFLEX P300
Measuring Range
METRAFLEX P300
Measuring
Range
1:1
1 V / A
3 A (1 V/A) 3 A 5 ... 999 mA
1:10
100 mV / A
30 A (100 mV/A) 30 A 0.05 ... 10 A
1:100
10 mV / A
300 A (10 mV/A) 300 A 0.5 ... 100 A