98-100 ISSUE 8
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‘Medium’ is the default setting. ‘Long’ will give you more stable readings
(for tighter limits) at the expense of test time, and ‘Short’ will test at the
maximum speed, but may give slightly noisier readings.
3. Enter the terminal names between which the inductance will be measured.
By pulling down the menu along side the fill-in box, you may select the
high and low terminals for each test.
4. Select (mouse click the button) the type of limits you require, and enter the
values.
%
Enter a nominal value and then the limits as negative and
positive values.
><
Enter minimum and maximum values.
>
Enter just a minimum value.
<
Enter just a maximum value.
5. Select OK. The test specification will then be displayed in the program
window.
LPBX – I
NDUCTANCE WITH
E
XTERNAL
B
IAS
(P
ARALLEL
C
IRCUIT
)
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 ‘LSBX Inductance with External Bias (Series Circuit)’ or ‘LPBX
Inductance with External Bias (Parallel Circuit) from the ‘Available Tests’
window, a dialogue box will be displayed.
Summary of Contents for dc1000
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