ABB COMMANDER 1900 Series Programming Manual page 26

...3 BASIC CONFIGURATION LEVEL
3.10 Scale Adjust
Information.
• Analog Inputs – do not require re-calibrating when the input type or range is changed.
• Span and offset adjust reset – removes any previously programmed Offset or Scale Adjustment settings.
• System offsets errors – can be removed from Process Variables, Remote Set Points and Position Feedback inputs using
Scale Offset Adjustment.
• System scale errors – can be removed from Process Variables, Remote Set Points and Position Feedback inputs using
span adjustment.
• Offset/span adjustment – can be used to perform spot calibration.
• Pen(s) – can be independently calibrated and checked across the full range of the chart.
• Mains filter – selectable for maximum noise rejection.
• Pen Linearity Check – automatically draws a pen linearity test pattern.
PV1 (x) Span Adjust
100°C
225°C
Note. As a general rule:
use adjustment for spot calibration at
Offset
use adjustment for spot calibration at
Span
24
Scale Adjustment
(+) Offset PV1
Offset Adjustment
Engineering Range
250.0°C
50.0°C
Span Adjustment
Engineering Range
250.0°C
50.0°C
Chart
AND
Display Offset Adjustment
OFFSEt
99. 8
CH1 AL1 AL2 AL3 AL4
CH2
CH3
CH4
Display Span Adjustment
SPAN
225. 5
CH1 CH1 AL1 AL1 AL2 AL2 AL3 AL3 AL4 AL4
CH2 CH2
CH3 CH3
CH4 CH4
of engineering range span.
<50%
of engineering range span.
>50%
Display
200. 3
CH1 AL1 AL2 AL3 AL4
CH2
CH3
CH4
Display
OFFSEt
100. 0
CH1 AL1 AL2 AL3
CH2
CH3
CH4
Display
SPAN
225. 0
CH1 CH1 AL1 AL1 AL2 AL2 AL3 AL3
CH2 CH2
CH3 CH3
CH4 CH4
AL4
AL4 AL4