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Test Chain
(Main Menu > Calibration > Numeric Data)
This is usually the total value of the test chain applied to the scale during a Chain
Procedure (see Calibration > Chain Procedure). The units are those of load (lb/ft,
kg/m) and the test chain should be stamped with its correct value by the factory.
ECal LC1 Value
(Main Menu > Calibration > Numeric Data)
This is the calculated output of the weighing mechanism in mV/V (millivolts per
volt) at Design Load, for loadcell number 1. This can be difficult to calculate
accurately and will usually be done by Merrick. However, in general, it can be
calculated as follows
ECal, mV/V = Ld x WS x SLc / WLc
Where
Ld = Design Load (i.e. lb/ft or kg/m)
WS = Gravimetric Weigh Span (i.e. ft or m)
SLc = Actual output of loadcell (or loadcells) at rated capacity (mV/V)
WLc = Rated capacity of loadcell (or loadcells) (i.e. lb or kg)
When performing this calculation, it is important to use the actual output of the
loadcell (SLc) as certified by the manufacturer, as this can be very different than
the nominal output. Also, the determination of Weigh Span can sometimes be
tricky (see Main Menu > Calibration > Numeric Data > Weigh Span). Contact the
Merrick Customer Support department for assistance if required.
ECal LC2 Value
(Main Menu > Calibration > Numeric Data)
This is the calculated output of the weighing mechanism in mV/V (millivolts per
volt) at Design Load, for loadcell number 2. It is calculated the same as for loadcell
number 1, above. This value only appears in the menu, if 2 loadcells are
configured (see Main Menu > Advanced Setup > Configuration).
Zero Tracking
(Main Menu > Calibration > Numeric Data > Zero Tracking)
Note: This item will only appear in this menu if Zero Tracking is enabled (see
Advanced Set-up > Configuration).
Zero Tracking (also known as “Auto-Zero”) is a process by which a belt feeder or
belt conveyor can be allowed to zero itself, while running, if certain conditions are
met. Errors in Zero are the most significant source of poor accuracy and so this
can be a very powerful means to improve your performance of your belt scale (or
feeder).
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