User Manual – Rev BE AMETEK Programmable Power
MX Series 277
parameters must be set before starting the test. The following is a description
of these parameters.
REDUCE TO:
The lowest voltage level as a percentage of the nominal voltage.
FALL TIME:
The time in seconds it will take the output to reach the REDUCE TO voltage.
HOLD TIME:
The time in seconds the output will hold at the REDUCE TO voltage.
RISE TIME:
The time in seconds the output will reach the NOMINAL voltage from the
REDUCE TO voltage
The timing of voltage variations is different between editions 1.0 and 2.0 of the
IEC 61000-4-11 test standard. While the original standard used voltage ramps
on both sides of the variation test level, the Edition 2.0 standard calls out an
abrupt drop to the test level, followed by a voltage ramp back to the nominal
voltage. Thus, for Edition 2.0, the fall time must be set to 0.000 seconds. This
requires firmware revision 0.31 or higher. Older firmware revision will not
accept 0.000 sec for fall time. The shortest allowable fall time for older revision
firmware is 0.02 sec.
Furthermore, where under Edition 1.0 rise and fall times were specified in
seconds, they are specified in number of cycles in Edition 2.0. This is an effort
to normalize both 50 Hz and 60 Hz voltage variations.
Refer to Figure 9-17 and Figure 9-18 for an illustration of how these parameters
affect the V RMS output under the different standard revisions.
Figure 9-17: EN 61000-4-11 Voltage Variation Specification - Edition 1.0
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