Effects of autocalibration on accuracy, Effects of autocalibration on accuracy -33 – Rockwell Automation 1762-IR4 RTD/Resistance Input Module User Manual
Page 67
Publication 1762-UM003A-EN-P - February 2003
Module Data, Status, and Channel Configuration 3-33
Effects of Autocalibration
on Accuracy
The module performs autocalibration to correct for drift errors over
temperature. Autocalibration occurs immediately following
configuration of a previously unselected channel, during power cycle
of enable channels and every 5 minutes if so configured. The table
below shows module accuracy with and without calibration.
Table 3.17 Module Accuracy
Input Type
(1)
With Autocalibration
Without Autocalibration
Maximum Error at 25
°
C (77°F) Maximum Error at 60
°
C
(140°F)
Temperature Drift (0
°
C to 60
°
C)
(32°F to 140°F)
100
Ω
Platinum 385
±
0.5
°
C (±0.9°F)
±
0.9
°
C (±1.62°F)
±
0.026
°
C/
°
C (±0.026°F/°F)
200
Ω
Platinum 385
±
0.5
°
C (±0.9°F)
±
0.9
°
C (±1.62°F)
±
0.026
°
C/
°
C (±0.026°F/°F)
500
Ω
Platinum 385
±
0.5
°
C (±0.9°F)
±
0.9
°
C (±1.62°F)
±
0.026
°
C/
°
C (±0.026°F/°F)
1000
Ω
Platinum 385
±
0.5
°
C (±0.9°F)
±
0.9
°
C (±1.62°F)
±
0.026
°
C/
°
C (±0.026°F/°F)
100
Ω
Platinum 3916
±
0.4
°
C (±0.72°F)
±
0.8
°
C (±1.44°F)
±
0.023
°
C/
°
C (±0.023°F/°F)
200
Ω
Platinum 3916
±
0.4
°
C (±0.72°F)
±
0.8
°
C (±1.44°F)
±
0.023
°
C/
°
C (±0.023°F/°F)
500
Ω
Platinum 3916
±
0.4
°
C (±0.72°F)
±
0.8
°
C (±1.44°F)
±
0.023
°
C/
°
C (±0.023°F/°F)
1000
Ω
Platinum 3916
±
0.4
°
C (±0.72°F)
±
0.8
°
C (±1.44°F)
±
0.023
°
C/
°
C (±0.023°F/°F)
10
Ω
Copper 426
±
0.6
°
C (±1.08°F)
±
1.1
°
C (±1.98°F)
±
0.032
°
C/
°
C (±0.032°F/°F)
120
Ω
Nickel 618
±
0.2
°
C (±0.36°F)
±
0.4
°
C (±0.72°F)
±
0.012
°
C/
°
C (±0.012°F/°F)
120
Ω
Nickel 672
±
0.2
°
C (±0.36°F)
±
0.4
°
C (±0.72°F)
±
0.012
°
C/
°
C (±0.012°F/°F)
604
Ω
Nickel-Iron 518
±
0.3
°
C (±0.54°F)
±
0.5
°
C (±0.9°F)
±
0.015
°
C/
°
C (±0.015°F/°F)
150
Ω
±
0.15
Ω
±
0.25
Ω
±
0.007
Ω
/
°
C (±0.012
Ω
/°F)
500
Ω
±
0.5
Ω
±
0.8
Ω
±
0.023
Ω
/
°
C (±0.041
Ω
/°F)
1000
Ω
±
1.0
Ω
±
1.5
Ω
±
0.043
Ω
/
°
C (±0.077
Ω
/°F)
3000
Ω
±
1.5
Ω
±
2.5
Ω
±
0.072
Ω
/
°
C (±0.130
Ω
/°F)
(1) The accuracy values apply to both current sources.