AMETEK CTS 3.0 - Manual (Page 114)

Compliance Test System 3.0 User Manual
110
9.6 Voltage Fluctuation
The IEC 61000-4-14 test standard specifies a specific voltage fluctuation methods for changing
the voltage between test levels. This fluctuation is a combination of a series of 5 single period
fluctuations, each having a 0.25 period slew starting at 270° phase angle of the voltage waveform.
Thus, the complete rise (t
r
) and fall (t
f
) time of the voltage fluctuation includes the following two
items:
a) Single Period Fluctuation
Lasts for one period of the fundamental frequency. The voltage changes starts at the 270° phase angle
and changes linearly for one quarter period until it reaches the next voltage level (delta Unom / 5) at 0°.
This is illustrated in the figure below.
b) Complete Fluctuation
Five single period fluctuations as shown above combine into the complete voltage fluctuation to the test
level. [Unom ± delta Unom] The test level is held for a 2 second period and then stepped back up or
down to its nominal value. This is illustrated in the figure below which combines figures 1b and 1c of
the IEC 61000-4-14 test standard.
Note: Prior versions of the Cigui32 (< 1.20.0.1) required a user selection between a slew or a
stepped voltage fluctuation. Both have been combined per above description to more closely
follow the IEC 61000-4-14 test standard.