7.9.12.4.2 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. 218) and
FieldCal() Slope (Opt 3) Example
(p. 220) 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.
7.9.12.4.3 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. 223) for a demonstration program.
7.9.12.5 Field Calibration Examples
FieldCal() has the following calibration options:
• Zero
• Offset
• Two-point slope and offset
• Two-point slope only
• Zero basis (designed for use with static vibrating-wire measurements)
These demonstration programs are provided as an aid in becoming familiar with
the FieldCal() features at a test bench without actual sensors. For the purpose of
the demonstration, sensor signals are simulated by CR1000 terminals configured
for excitation. To reset tests, use the support software File Control
(p. 515) menu
commands to delete .cal files, and then send the demonstration program again to
the CR1000. Term equivalents are as follows:
"offset" = "y- intercept" = "zero"
"multiplier" = "slope" = "gain"
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