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Chapter 2: Features, Functions, and Kits 2-11
Scale Features and Functions
The scale is used in the 2000, 4000, and 4500 models. It can be
manufactured by NCR or by a vendor for a specialized market such as
the price-computing scale in the 4500 model to meet European
standards.
Scale Functions and Features
Load Cell
The NCR 7870 uses a single load cell rather than four, which is more
typical, to increase reliability. The scale has a settling time of 0.9
seconds for items weighing less than 2.3 kg (5 lbs.) It is sealed to avoid
damage from spills around the unit. There are three basic types of load
cells:
•
For weighing in pounds. Capacity: 30 lbs.
•
For weighing in kilograms. Capacity: 9.995 kg
•
For weighing in kilograms. Capacity: 13.995 kg
Reset / Scale Zero
A front-mounted Scale Reset button is located on the front bezel, to the
left of the vertical scan window. This flush membrane switch will reset
the scale due to fluctuation from extreme temperature drift, impact, or
scale tare up to:
1.
0.3 kg (0.6 lbs.) relative to the zero established during the most
recent power-on sequence
or
2.
0.6 kg (1.2 lbs.) relative to the calibration zero, whichever is less.
The scale reset function is completed in less than a second.
Auto-Zero
Scale electronics automatically tracks out stable shifts due to
temperature changes and compensates in 3 g (0.006 lb.) increments up
to a maximum of 0.3 kg (0.6 lbs.).