Campbell CR6 Series, Operator'S Manual

Page: 283 / 690

Section 7. Installation
283
4. Set KnownVar variable to the offset or zero value.
5. Set mode variable = 1 to start calibration.
7.7.12.4.2 Two-Point Calibrations (gain and offset)
Use this two-point calibration procedure to adjust multipliers (slopes) and offsets
(y intercepts). See FieldCal() Slope and Offset (Opt 2) Example
(p. 289)
and
FieldCal() Slope (Opt 3) Example
(p. 291)
for demonstration programs:
1. Use a separate FieldCal() instruction and separate variables for each sensor to
be calibrated.
2. Ensure mode variable = 0 or 6 before starting.
a. If Mode > 0 and ≠ 6 , calibration is in progress.
b. If
Mode
<
0
, calibration encountered an error.
3. Place sensor into first known point condition.
4. Set KnownVar variable to first known point.
5. Set
Mode
variable = 1 to start first part of calibration.
a. Mode = 2 (automatic) during the first point calibration.
b. Mode = 3 (automatic) when the first point is completed.
6. Place sensor into second known point condition.
7. Set KnownVar variable to second known point.
8. Set Mode =
4
to start second part of calibration.
a. Mode = 5 (automatic) during second point calibration.
b. Mode = 6 (automatic) when calibration is complete.
7.7.12.4.3 Zero Basis Point Calibration
Zero-basis calibration (
FieldCal()
instruction Option 4 ) is designed for use with
static vibrating wire measurements. It loads values into zero-point variables to
track conditions at the time of the zero calibration. See FieldCal() Zero Basis
(Opt 4) Example
(p. 294)
for a demonstration program.
7.7.12.5 Field Calibration Examples
FieldCal() has the following calibration options:
•
Zero