ABB SM500F User Manual page 120

SM500F
Field mountable paperless recorder
118
Actual value / Desired value
1. Adjust the process or simulated input signal to a known value
below 50% of the engineering range.
2. If 'Actual value' (in engineering units) is different from expected, set
'Desired value' to the correct value ('Offset adjust' and 'Span
adjust' values are calculated automatically).
3. Repeat steps 1 and 2 for a value above 50% of the engineering
range.
4. Repeat steps 1 to 3 for each input.
Reset adjustment
Select to reset 'Offset adjust' and 'Span adjust' (below) to zero and to 1
respectively.
Offset adjust / Span adjust
Manually fine-tune the offset adjust and span adjust values to remove
process errors. These are calculated values applied to the raw input
signal.
Note. If simulating thermocouple inputs, connect the millivolt source
using appropriate compensating cable – see Table 2.1, page 20. For
2-lead resistance thermometers, either connect the resistance box at the
sensor end of the leads or add the lead resistance to the calibration
values.
Without Adjustment
(Span Adjust = 1, Offset Adjust = 0)
7 Configuration
With Adjustment
(typical example)
IM/SM500F Rev. Z