Rockwell Automation Publication 1444-UM001D-EN-P - June 2018 299
Operate the Module Chapter 10
Table 74 - Input: Sine-wave, 0.707 RMS
Hardware and Firmware Design
The module hardware is designed to provide accurate, repeatable
measurements, over a range of operating and environmental conditions.
Selected components such as the precision of the 24-bit Analog to Digital
converters, or the delta-sigma hardware anti-alias filters, directly affect
measurement precision and accuracy. Design elements that provide sources of
error or noise also affect measurement precision and accuracy.
Sources of error can include circuits that amplify or attenuate signals, which
include components that have a precision tolerance, which then add to the
potential error in the measurement. To minimize these errors, the 1444 design
helps eliminate these circuits where the same function can be performed in
firmware.
Input: Sine-wave, 0.707 RMS (-5 to -3V), ADC FMAX = 4578 Hz, 0.1 Hz HPF
Measurements (volts RMS)
Values that are stated as "avg" are approximate as the measurement is varying by >10%
Frequency TC=0.5 (Default) TC=30 TC=60 Tracking Filter RPM
OAO OA1 OAO OA1 1xM 1xP
60 0.717 0.716 0.715 0.715 0.715 81 3600
50 0.715 0.715 0.715 0.715 0.715 81 3000
40 0.715 0.716 0.715 0.715 0.715 81 2400
30 0.716 0.716 0.715 0.715 0.715 81 1800
20 0.711 0.710 0.715 0.715 0.715 81 1200
15 0.717 0.717 0.715 0.715 0.715 81 900
10 0.710 0.720 0.715 0.715 0.715 80 600
9 0.710 0.710 0.715 0.715 0.715 80 540
8 0.720 0.710 0.715 0.715 0.715 80 480
7 0.715 0.715 0.715 0.715 0.715 80 420
6 0.71 avg 0.71 avg 0.715 0.715 0.715 80 360
5 0.72 avg 0.71 avg 0.715 0.715 0.715 79 300
4 0.71 avg 0.71 avg 0.715 0.714 0.715 79 240
3 0.71 avg 0.71 avg 0.714 0.714 0.714 77 180
2 0.71 avg 0.71 avg 0.715 0.711 0.712 75 120
1 0.68 avg 0.68 avg 0.715 0.697 0.702 70 60
0.5 0.64 avg 0.68 avg 0.714 0.664 0.664 57 30
0.25 0.65 avg 0.44 avg 0.708 0.573 0.556 40 15
OA0 = Post Filter, OA1 = Mid-Filter
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