PSM1700 PsimetriQ user manual
16-4
16.2 Inductance & leakage inductance
The inductance of a winding is computed from the complex
ratio of CH1 (voltage across the winding) divided by CH2
(current through the winding) using DFT analysis at the
fundamental frequency (refer to the chapter on gain/phase
analysis for the formulae for DFT analysis).
CH2 is forced to be external shunt input – enter the value
of the external shunt as the source resistance via the
SETUP menu.
To manually connect a transformer for inductance
measurement, connect an appropriate source resistance in
series with the winding and connect the PsimetriQ output
across the series combination of the source resistance and
winding. Connect the CH1 input across the winding to
measure the voltage, and CH2 across the series resistance
(note that the polarity of external shunt input is the
opposite of that for voltage). Leave all other windings
open.
To manually measure leakage inductance, use the same
set up as for inductance but short the other windings.
When using the transformer analyser fixture, the
connections for inductance or leakage inductance are
made automatically by relays.
When measuring small inductance it may be necessary to
zero out stray effects by replacing the winding with a good
short and pressing ZERO. The message ‘ZERO SET’ will be
displayed. To remove the effect of the zero press ‘ZERO’
followed ‘DELETE’ within 1.5s and the message ‘ZERO
CLEARED’ will be displayed.
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