Velleman LCR40 - Manual (Page 7)

Atlas LCR User Guide January 2009 – Rev 4
Page 7
Testing Inductors
The Atlas LCR is designed to analyse most inductors, coils and
chokes.
Inductor test frequency
: The test frequency that the Atlas LCR uses will be
automatically selected from 1kHz, 15kHz or 200kHz. The following table
shows the test frequencies used for various inductance ranges:
Inductance Range Test Frequency Used
Between 0µH and 0.3mH 200kHz
Between 0.3mH and 4mH 15kHz
Between 4mH and 10H 1kHz
The inductance range for each test frequency shown in the table above is
approximate
. Effects such as DC resistance, hysteresis and Q factor can
influence the frequency that the Atlas LCR selects for your particular
inductor.
Inductance range
: Values ranging from about 1µH to 10H can be measured,
with a minimum resolution of 0.4µH. The DC resistance of the inductor is
measured from 0.5Ω to 1kΩ with a
minimum resolution of 0.3Ω.
Inductor results:
Following analysis,
the inductance is displayed.
Press scroll-off to display the
frequency at which the inductance was
measured.
Pressing the scroll-off button again will
display the inductor's DC resistance.
Inductance measured for some components can be dependant on the test
frequency used. The effect of frequency on inductance varies depending on
the type of windings and core utilised. Even air cored inductors can show
significant changes of measured inductance at different frequencies.
Inductance Inductance Inductance Inductance
1.507mH 1.507mH 1.507mH 1.507mH
Test frequency Test frequency Test frequency Test frequency
15kHz 15kHz 15kHz 15kHz
DC Resistance DC Resistance DC Resistance DC Resistance
67.2 ohms 67.2 ohms 67.2 ohms 67.2 ohms