Voltech AT360, User Manual

Page: 371 / 470

V
OLTECH
AT
I
U
SER
M
ANUAL
P
AGE
7-73
7.1.17 LVOC – L
OW
V
OLTAGE
O
PEN
C
IRCUIT
Measurement
Range
Test
Voltage
Test
Frequency
Basic
Accuracy
100
µ
V to 5V
1mV to 5V 20Hz to 3MHz 0.1%
Applying an AC voltage to the primary of the transformer will produce an
AC voltage in the secondary. Low Voltage Open Circuit measures the
‘open circuit’ voltage produced when the specified test signal is applied.
The secondary voltage may be in phase with the primary voltage or it
may be anti-phase depending on the winding and the termination of the
windings.
Where Used
The low voltage open circuit test is used to confirm that windings have the
correct ratio of turns between them, and that the phasing of the windings is
correct. This test is used for signal, pulse and switched mode power
transformers where the normal operating conditions require only small
excursions of the B-H curve, never extending beyond the linear region. On the
AT3600 only, a high voltage open circuit test is available for testing line