Advanced Videographic Recorder
SM2000
4 CONFIGURATION
IM/SM2000
Issue 11
95
4.7.2 Relay Modules
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
Section 5.4.2, page 104. 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)
Engineering
Low
Engineering
High
Unadjusted Value
Engineering
Low
Engineering
High
Adjusted
Value
With Adjustment
(typical example)
Adjusted
Value
Engineering
Low
Engineering
High
Engineering
Low
Engineering
High
Unadjusted Value
Offset Adjust (>0)
Span Adjust (<1)
Select the relay source (a digital source) to be used to energize/
de-energize the relay.
Note.
If the relay is used to provide a totalizer count pulse, the
maximum pulse frequency is 5Hz. Consideration must also be
given to the mechanical life of the relay.
Select the relay source polarity.
Note.
When polarity is set to 'Positive', the relay is energized
when the digital source is active (On).