ATHENE 100
– SPREADER RATE CONTROLLER
16
7.4
Nudging the Calibration
If you find a consistent discrepancy between the instrument weight reading
and the actual weight dispensed, you can either,
(i)
Leave the existing Calibration Factor as it is and adjust the
calibration by setting a “Nudge Factor” (a % change). The
calibration factor can be nudged up to ±50% in 1% steps.
(ii)
Calculate a new Calibration Factor using a simple formula (7.4.4)
and re-programme it.
7.4.1 Under-application
If the weight displayed on the instrument is more than the actual weight
dispensed, the calibration factor must be
decreased.
E.g. If the weight reading is 10% high, then set the nudge figure to “90”
(indicating the system is only applying 90% of what it should be). This value
will then nudge the current calibration factor to ensure that 10% more
product will be dispensed, which will then ensure the application rate is
correct.
7.4.2 Over-application
If the weight displayed on the instrument is less than the actual weight
dispensed, the calibration factor must be
increased.
E.g. If the weight reading is 15% low, then set the nudge figure to “115”
(indicating the system is applying 15% more than it should be). This value
will then nudge the current calibration factor to ensure that 15% less product
will be dispensed.
7.4.3 Setting a Nudge Factor
1. Switch the instrument off.
2. Select Cal Mode 3 by pressing the button and switching the
instrument on again. The instrument defaults to the channel.
3. Press the button to select the channel.
4. Press the or button to set the nudge factor.
5. Switch the instrument off then back on again to resume the normal operating
mode.
