Voltech AT3600 User Manual page 293

V AT3600 U
OLTECH SER
1.8. D – D
The parameter 'D' is most often used as a measurement of the losses in a capacitor. It
is analogous to Q for a transformer winding.
For this equivalent circuit the Dissipation Factor D is defined as:
For a given capacitance, the lower the equivalent series resistance, the lower is the
value of the dissipation factor or tanδ, i.e. the 'better' the capacitor.
Where used
The dissipation factor test would normally be used for capacitors of all types. A D
factor test will help to determine that the capacitor has been manufactured correctly.
Measurement conditions
To measure Dissipation Factor, the tester applies an ac voltage across the selected
winding, and measures the voltage across and the current through the winding. Using
harmonic analysis, the measured voltage is divided by the current to obtain a complex
impedance from which the Dissipation Factor is obtained.
T T C
ESTS AND EST ONDITIONS
M
ANUAL
ISSIPATION
Measurement
Range
0.001 to 1000
AT Series
Tester
(where ω = 2πf)
D = Rs
1/ωCs
F
ACTOR OR
Test
Voltage
1mV to 5V 20Hz to 3MHz
Rs
VPN 98 - 024
T
RANSFORMER
δ
T
AN
Test Basic
Frequency Accuracy
0.5%
C
T
ESTS
P 7.1.13.
AGE