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© 2011 Schneider Electric. All Rights Reserved.
63230-500-225A2 PowerLogic
TM
Series 800 Power Meter
3/2011 Chapter 8—Waveform Capture
63
Chapter 8—Waveform Capture
Introduction
This section explains the waveform capture capabilities of the following Power Meter
models:
• PM850
• PM870
See Table 8–1 for a summary of waveform capture features.
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 PowerLogic software 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 PM870 only.
In the PM850, the waveform capture records five individual three-cycle captures at 128
samples per cycle simultaneously on all six metered channels. In the PM870, 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 your software.
Use Figure 8–1 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).
Table 8–1: Waveform capture summary by model
Waveform Capture Feature PM850 PM870
Number of waveform captures 5 5
Waveform initiated:
Manually
By alarm
Samples per cycle 128 Configurable*
Channels (1 to 6) Configurable Configurable*
Cycles 3 Configurable*
Precycles 1 Configurable*
* See Figure 8–1.
Figure 8–1: PM870 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