User Manual, Firmware rev. 3.0 or LATER Owner's manual

Publication 1404-UM001F-EN-P - November 2009 161
Advanced Features Chapter 8
• Capture clear status: Read-only bitfield that indicates which
capture numbers are clear. Bit 0 (LSB) corresponds to capture 1,
bit 1 to capture 2 and so on. For each bit, 1 indicates clear, 0
indicates not clear.
• Capture ready status: read-only bitfield that indicates which
capture numbers contain captures that are ready to read. Same
bit correspondence as above. For each bit, 1 indicates the
capture is ready, 0 indicates no capture or not yet ready. If a
client reads a capture that is not ready, -1 is returned for all data
points.
Block Number
The block number and the total number of data reads required to read
an entire capture depend on the communication option and the
capture type.
See the Capture Type Properties
table.
The block number range is 1 to the number of Data reads required
listed in the table.
Capture Type
The properties associated with the capture type options are listed in
the Capture Type Properties
table.
You may select a capture type that best suits your application
requirements. A higher sample rate provides a more accurate
representation of the waveform when higher-order harmonics and
transients are present. Higher data resolution provides more accuracy
of each data point. Capture type 5 combines low sampling rate and
low resolution, but captures almost 7 seconds of waveform at 60 Hz.
Capture Type Properties
Capture
Type
Sampling
Rate
Data
Resolution
Samples per
Cycle at 60 / 50
Hz
Total Cycles per
Channel at 60 / 50
Hz
Capture
Duration
(seconds)
Data Reads Required
DeviceNet Other Comms
0 5.4 kHz 13-bit
w/sign
90 / 108 51.1 / 42.6 0.85 230 92
1 2.7 kHz 45 / 54 102.2 / 85.2 1.70
2 1.35 kHz 22.5 / 27 204.4 / 170.3 3.40
3 5.4 kHz 7-bit
w/sign
90 / 108 102.2 / 85.2 1.70 460 184
4 2.7 kHz 45 / 54 204.4 / 170.3 3.40
5 1.35 kHz 22.5 / 27 408.8 / 340.7 6.81