Voltech ATi User Manual page 372

T T
ESTS AND EST
frequency transformers at their operating point (up to 270V, 1kHz and 2A). See
also the test TR – turns ratio.
Test Conditions
To measure low voltage open circuit, the test signal is applied to one winding
called the energized winding. The voltages across another winding (or the
same, energized winding) are measured. The low voltage open circuit
measurement is the rms value of the voltage measured and can be an AC or a
DC voltage.
It is recommended that you choose the winding with the highest number of
turns as the one to be energized.
Choosing Test Conditions
The recommended test conditions depend on the inductance of the energized
winding; they are given in the table below assuming that the energized winding
is the one with the highest number of turns:
100nH
1uH
10uH
100uH
1mH
10mH
100mH
1H
10H
100H
1kH
P 7-74
AGE
C
ONDITIONS
Inductance of the
Energized Winding
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Frequency
1µH 300kHz
10µH 100kHz
100µH 30kHz
1mH 10kHz
10mH
100mH 100Hz
1H 100Hz
10H
100H
1kH
10kH
Preferred Test Signal
Voltage
1kHz
50Hz
50Hz
50Hz
20Hz
V AT U
OLTECH I SER
10mV
30mV
50mV
100mV
100mV
100mV
300mV
1V
5V
5V
5V
M
ANUAL