12
INDICATOR CALIBRATION
Calibration Overview
There are two ways to calibrate the instrument:
1.
Live calibration
: You will be calibrating a scale platform to the indicator using actual
loads, e.g., test weights. In general, this is the most accurate and dependable method of
the two.
2.
mV/V
calibration:
You will be calibrating the instrument using a load cell simulator (cal-
ibrator). You must calculate what weight value corresponds to a specific mV/V setting
on the calibrator. (Hint: use the rated output of the load cell.)
For both methods, the calibration procedure comprises two steps:
zero
calibration (F16) and
span
calibration (F17). We recommend doing
zero
calibration (F16) first.
Only one span calibration point is supported on this model. This span calibration point is denot-
ed as C1. The minimum load that can be used for C1 is 1% of Max (maximum capacity). The
recommended load is 2/3 of Max, however 100% of Max can also be used. In general, the larger
(heavier) the calibration weight, the more accurate the scale will be after calibration.
The
procedures that follow are written for “live” calibration mode. When using a calibrator, simp-
ly substitute the mV/V setting for the prompted load (weight) values.
Zero Calibration Instructions (F16)
1. While in the Setup mode, scroll to "
F 16
", and then scroll down once using the
ZERO (down) key. The display will momentarily show "
C 0
" followed by a value. This
value is the internal A/D count and can prove useful when trying to troubleshoot setup
problems.
2. Assure a no-load condition on the scale platform and then press the ZERO key again to
zero the display reading. Do NOT skip this step!
3. Press the NET/GROSS (set) key to save the zero-point value. The display will show
“
SET
” and "
EndC0
" momentarily, and then revert up to F16.
Span Calibration Instructions (F17)
1. While in the Setup mode, scroll to "
F 17
", and then scroll down once using the ZERO (down)
key. The indicator will
briefly display ‘
C 1
’ and then prompt you to enter the data for the span
calibration point (C1).
2. Place the actual calibration load (weights) onto the scale platform.
3. Use the four directional keys to enter in the actual calibration weight value, e.g., 5000 lb.
Increase the flashing digit by pressing the UNITS key. Decrease the flashing digit by press-
ing the ZERO key. Pressing the TARE key or the PRINT key will change the position of the
flashing digit.
4. Press the NET/GROSS (set) key to save this value. The indicator briefly displays
‘End C1’
,
and then reverts up to the F17 screen.
