1.
New Span =
Actual Upscale - Actual Downscale
X Old Span
Displayed Upscale - Displayed Downscale
2.
New Offset =
(Actual Upscale - Min. Scale) X 3840
-
Maximum Scale - Minimum Scale
Displayed Upscale - Min. Scale X 3840
-
Old
X
New Span
Maximum Scale - Minimum Scale
Offset
Old Span
NOTES:
1.
Offset value may be a positive or negative number.
2.
Zero sensor readings (no bar) cannot be used for calibration since they may be below scale. When this
situation occurs, raise the offset value until a small onscale (bar present) reading Is displayed before
beginning calibration.
D.
If the sensor uses a non-linear look-up table (noted In data base section of Sensor Spec. Dwg.) there are
three possible situations.
1.
The sensor has a fixed span value requiring only offset calibration.
2.
The sensor has a given offset value, requiring only span calculation and offset adjustment.
3.
Both span and offset must be calibrated.
The appropriate situation will be noted In the Sensor Spec. Dwg. data base section.
For the above situations, the following corresponding calibration procedure must be followed:
Situation 1:
Using a repetitive technique, calculate the new offset (refer Section C) repeatedly until the screen Is
within +/- 1% of the desired reading. This may take several calculations to achieve, but Is required
for proper results.
Section 4 - Page 2
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