VOLTECH AT3600 USER MANUAL TRANSFORMER TESTS
TESTS AND TEST CONDITIONS VPN 98 - 024 PAGE 7.1.13.
1.8. D – DISSIPATION FACTOR OR TANδ
Measurement
Range
Test
Voltage
Test
Frequency
Basic
Accuracy
0.001 to 1000 1mV to 5V 20Hz to 3MHz 0.5%
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:
D = Rs (where ω = 2πf)
1/ωCs
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.
AT Series
Te st er
Rs
C
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