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24
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.
Note. As a general rule:
use
Offset
adjustment for spot calibration at
<50%
of engineering range span.
use
Span
adjustment for spot calibration at
>50%
of engineering range span.
(x) Span Adjust
PV1
Chart
(+) Offset
PV1
Display
AND
AL4
AL3
AL2
AL1
CH1
CH2
CH3
CH4
Scale Adjustment
Offset Adjustment
Span Adjustment
Engineering Range
100
°
C
250.0
°
C
50.0
°
C
Offset Adjustment
Display
AL4
AL3
AL2
AL1
CH1
CH2
CH3
CH4
OFFSEt
100.0
Display
AL4
AL3
AL2
AL1
CH1
CH2
CH3
CH4
OFFSEt
99.8
Engineering Range
225
°
C
250.0
°
C
50.0
°
C
Span Adjustment
Display
AL4
AL3
AL2
AL1
CH1
CH2
CH3
CH4
AL4
AL3
AL2
AL1
CH1
CH2
CH3
CH4
Display
AL4
AL3
AL2
AL1
CH1
CH2
CH3
CH4
AL4
AL3
AL2
AL1
CH1
CH2
CH3
CH4
200.3
SPAN
225.0
SPAN
225.5
…3
BASIC CONFIGURATION LEVEL