Rice Lake Intercomp CS 750 - Users Manual - Manual (Page 12)

CS750, Users
Rev R, May 2009
Page 12 of 27
Calibration
How to test the calibration
This calibration procedure should be performed annually for normal operating
conditions. If the scale is dropped or damaged, or service has been performed on the
scale, use this calibration check. Recommend calibration points at 10% intervals from
10% through 100% of the scales capacity.
1. Press the ON switch. The display does a lamp test; during this time the scale does
a quick check of itself. Then the weighing system starts weigh mode.
2. Intercomp recommends that you allow the electronics to operate for three minutes
after first turning power on. This allows the electronics to become stable for
maximum accuracy before you check the calibrations.
3. Make sure no weight is on the hook. Press the ZERO switch. The weight shown is
zero.
4. Apply weights throughout the weighing range, and verify the correct weight is
displayed at each step. (+/- 0.1% of applied load or ±1 display graduation, whichever
is greater)
5. If possible apply a weight of 105% of capacity, and verify the scale shows “OE OE OE OE” on
the display.
6. Remove weights and verify the display returns to zero.
7. If there is a failure to meet any of the conditions above, please refer to the
Calibration Procedure.
8. When all the conditions above are correct, the scale is operational.
How to enter a number
During this routine you will be asked to enter numbers at many points. The scale will
show a number (originally all zeros) with a blinking digit. Press the ZERO key to
increase the blinking digit. Press the hidden key to move to other digits. When you are
finished entering the number press the ZERO and hidden keys together.
Three point span
The scale has a three point calibration feature which reduces the effects on non-
linearity in the load cells. This requires that you place three weights on the cell during
calibration. The first weight must be greater than zero, the second greater than the
first, and the final weight somewhere between the second and the capacity.