Voltech AT3600 - Page 347

VOLTECH AT3600 USER MANUAL TRANSFORMER TESTS
TESTS AND TEST CONDITIONS VPN 98 - 024 PAGE 7.1.67.
1.40. LSBX – Inductance with External Bias (Series
Circuit)
DC Bias
Measure
Range
Test
Voltage
Test
Frequency
Basic
Accuracy
0.1A to
250A
1nH 1MH 1mV to 5V 20Hz to 3MHz
0.2% @ Q>10
This test requires the use of one or more Voltech DC1000 Precision DC Bias
Current Sources. Contact your Voltech sales office for details.
The inductance of a transformer winding while an external bias current is flowing
through it may be tested using series or parallel equivalent circuit models. Initially
the DC bias current is set up and allowed to stabilize. An AC voltage is applied
across the selected winding; the voltage across and current through the winding is
then measured using harmonic analysis. The measured voltage is divided by the
current to obtain a complex impedance and the inductance is calculated.
1.41. LPBX – Inductance with External Bias (Parallel
Circuit)
DC
Bias
Measure
Range
Test
Voltage
Test
Frequency
Basic
Accuracy
0.1A to
250A
1nH 1MH 1mV to 5V 20Hz to 3MHz
0.2% @ Q>10
This test requires the use of one or more Voltech DC1000 Precision DC Bias
Current Sources. Contact your Voltech sales office for details.
The inductance of a transformer winding while an external bias current is
flowing through it may be tested using series or parallel equivalent circuit
models. Initially the DC bias current is set up and allowed to stabilize. An AC
voltage is applied across the selected winding; the voltage across and current
through the winding are then measured using harmonic analysis. The measured
voltage is divided by the current to obtain a complex impedance and the
inductance is calculated.