AMETEK CTS
H-Field Test
Operating Manual
V 1.20
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1.4.2.
Current transformer MFT 30
The MFT 30 has two current ranges 3 A and 30 A. The ranges can be select with the switch
at the rear side of the MFT 30. The two parallel current outputs to the antenna can be used
with connectors for 4 mm or 50 A.
The V/I characteristic of the transformer determines the voltage at the output of the variac to
generate the specified magnetic field. because the magnetic field antenna has a very small
impedance the impedance of the wiring mostly determines the V/I characteristic of the current
transformer.
Transformer Factors
Range 0…3 A
: approx.. 0.043 A/V
Range 0…30A
: approx.:0.434 A/V
Diagram and Current factor of MFT 30
The following table shows the voltage setting in dependency to the selected current range:
H-field
[ A/m]
Range 3 A
Primary voltage at
MFT 30 [V]
Range 30 A
Primary voltage at
MFT 30 [V]
Antenna
current [A]
1
26.8
1.15
3
80.0
7.5
3.46
10
(263)
25.5
11.5
30
77.5
34.48
230V
0...3A/m
0...30A/m
