Rockwell Automation 1790P-T4T0 CompactBlock LDX I/O Thermocouple Modules - Manual (Page 37)

Publication 1790-UM003A-EN-P
Module Data, Status, and Channel Configuration for DeviceNet 3-7
Effective Resolution The effective resolution for an input channel depends upon the filter
frequency selected for that channel. The table below identifies the
number of significant bits used to represent the data for the mV input
range for each available filter frequency. The number of significant bits is
defined as the number of bits that will have little or no jitter due to noise,
and is used in defining the effective resolution.
The following graphs provide the effective resolution for each
thermocouple type for each available filter frequency. These graphs do
not include the affects of unfiltered input noise. Choose the frequency
that most closely matches your system requirements.
Figure 3.3 Type B Thermocouple
Table 3.7 Effective Resolution vs. Input FIlter Selection for mV Inputs
Filter Frequency Effective Resolution
10 Hz sign +13 bits: 10
µ
V
25 Hz sign +13 bits: 10
µ
V
50 Hz sign +13 bits: 10
µ
V
60 Hz sign +13 bits: 10
µ
V
100 Hz sign +13 bits: 10
µ
V
250 Hz sign +12 bits: 20
µ
V
500 Hz sign +11 bits: 40
µ
V