Voltech AT360, User Manual

Page: 423 / 470

V
OLTECH
AT
I
U
SER
M
ANUAL
P
AGE
7-125
7.3 C
APACITOR
M
EASUREMENTS
The ATi and its front panel LCR mode are ideal for making precise
measurements on capacitors.
Capacitance (Farads)
To measure the capacitance, use the C test in the PC editor or simply select C
on the top line of the LCR mode. The measurement conditions can be fully
automatic or user programmed following the guidelines given earlier in this
chapter. Measurements are usually made using the parallel equivalent circuit
(see the preceding section).
D Dissipation Factor or tan
δδδδ
D can be selected as a second line parameter of the LCR mode. D is a
measure of the losses in a capacitor and is defined to be:
D = energy lost =

Real part of impedance (Rs)

=

tan
δδδδ
Energy stored Imaginary part of impedance (X)
Where
δδδδ
is the angle between the total complex impedance, Z., and the
imaginary axis.
Z
Φ
Rs
X
i i
r