20
…3
CONFIGURATION
(x) Span Adjust
A1
Chart
(+) Offset
A1
Display
AND
Scale Adjustment
Offset Adjustment
Span Adjustment
Engineering Range
100
°
C
250.0
°
C
50.0
°
C
Offset Adjustment
Display
Display
Engineering Range
225
°
C
250.0
°
C
50.0
°
C
Span Adjustment
Display
Display
ADJUST SCALE
A1 200.3
ADJUST OFFSET
A1 99.8
ADJUST OFFSET
A1 100.0
ADJUST SPAN
A1 225.0
ADJUST SPAN
A1 225.5
3.2.3
Scale Adjustment Page
Information.
•
Analog inputs – do not require re-calibrating when the input or range is changed.
•
Scale Adjustment Reset – removes any previously programmed offset or scale adjustment settings.
•
System Offset Errors – can be removed using Offset Adjustment.
•
System Scale Errors – can be removed using Span Adjustment.
•
Offset/span Adjustment – can be used to perform spot calibration.
Switch off the power supply to the instrument. Connect accurate signal sources, suitable for simulation over the entire input range,
in place of each analog input connection A1 to A6 (terminals TB1–1 to 18). For thermocouple inputs, connect the millivolt source
using appropriate compensating cable – see Table 4.1 on page 35. For 2-lead resistance thermometers, connect the resistance
box at the sensor end of the leads or the lead resistance must be added to the calibration values.
As a general rule use:
Offset adjustment for a spot calibration < 50% of engineering range span
Span adjustment for a spot calibration > 50% of engineering range span
