AMETEK CTS
H-Field Test
Operating Manual
V 1.20
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1.4.3.
Current transformers MFT 100-120/230
The MFT 100 is used for high magnetic fields from 80 A/m up to 1000 A/m. The transformer
is rated for constant current of 250 A. An internal overtemperature sensor will protect the
transformer. Cause off high primary current a contactor switches on and off the current. This
switch can be operated from the compact NX5/NX7 or NSG 3040A/3060A, while the current
connection is direct from the motor variac (variac NX1-260-16 or VAR 3005A-S16). There
are 2 versions available: MFT 100-120 for 120 V power supply and MFT 100-230 for 230 V
power supply, both devices are optically identical.
Transformer Factor
Approx.. 7.90 A/V
Diagram and Current factor of MFT 100
Tranformer factor 7.90
The Transformer Factor is influenced by the heating of the cables. For continuous testing
check the current with a current probe and adjust the voltage setting.
Using a variac with mains of 100 V or 115 V, the maximum achievable magnetic field is
approx. 750 A/m.
For generate H-fields > 750 A/m it is necessary to connect a booster transformator
115 V -> 230 V/10 kVA
