© 2008 Siemens Energy & Automation, Inc. All Rights Reserved.
ACCESS 9340 and 9360 Meters PMCM-9340D-0208
Chapter 9—Waveform Capture 2/2008
EN–104
Waveform Capture
A waveform capture can be initiated manually or by an alarm trigger
to analyze steady-state or disturbance events. This waveform
provides information about individual harmonics, which WinPM.Net
calculates through the 63rd harmonic. It also calculates total
harmonic distortion (THD) and other power quality parameters.
NOTE: Disturbance waveform captures are available in the ACCESS
9360 only.
In the ACCESS 9340/9360, the waveform capture records five
individual three-cycle captures at 128 samples per cycle
simultaneously on all six metered channels (see “Channel Selection
in ION Setup” on page 105). In the ACCESS 9360, there is a range of
one to five waveform captures, but the number of cycles captured
varies based on the number of samples per cycle and the number of
channels selected in WinPM.Net. Use Figure 9–1 to determine the
number of cycles captured.
NOTE: The number of cycles shown above are the total number of
cycles allowed (pre-event cycles + event cycles = total cycles).
Figure 9–1: ACCESS 9360 Number of Cycles Captured
6
5
4
3
2
1
30
35
45
60
90
185
15
15
20
30
45
90
16 32 64 128
7
9
10
15
20
45
3
4
5
7
10
20
Number
of
Channels
Number of Samples per Cycle
PLSD110333
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