Voltech AT5600 - LPBX - Inductance with External Bias (Parallel Circuit)

C H A P T E R 1 4 - A T E D I T OR
AT5600 User Manual 98-119 issue 14 Page 367
14.6.38. LPBX – Inductance with External Bias
(Parallel Circuit)
DC Bias
Measure
Range
Test
Voltage
Test
Frequency
Basic Accuracy
0.1A
to 1000A
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.
On selecting ‘LPBX Inductance with External Bias (Parallel Circuit) from the
‘Available Tests’ window, a dialogue box will be displayed.