Command 9 - Probe Calibrate - Casio CFX-9850G User Manual

Chapter 3: Commands and Programming

Command 9 - PROBE CALIBRATE

Command 9 tells calibrates probe sampling values and is used to calibrate
sampling levels when a high level of accuracy is required or when multiple
probes are being used.
Calibration is approximated using a linear equation and quadratic equation,
with coefficients specified using this command's coefficient parameter.
When performing calibration to improve accuracy, it is necessary to use a
separate reference measuring instrument of the level of accuracy desired to
sample a number of points under actual sampling conditions. At least two
points are required for the linear equation, while a minimum of three points
are required for the quadratic equation. The more points provide a greater
improvement in accuracy.
Selection of the linear equation or quadratic equation depends on sampling
conditions. The linear equation is normally used when calibrating for meas-
urement using multiple probes.
• The calibration performed by this command is approximate calibration,
and should not be relied upon when high accuracy is required. When the
sampling levels of two probes are calibrated with each other, values pro-
duced by sampling with the two probes under identical conditions will not
necessarily produce identical values.
Syntax
{9, Channel, Equation Type, Coefficient}
Channel Parameter
This parameter specifies channels for calibration. The initial default for this
parameter is 0.
0 Clears all calibration channels.
1 Channel 1 (CH1)
2 Channel 2 (CH2)
3 Channel 3 (CH3)
4 SONIC channel
Equation Type Parameter
This parameter specifies whether a linear equation or quadratic equation
should be used for calibration. The initial default for this parameter is 0.
0 Clears channel calibration equation for channel specified by the
channel parameter.
1 Linear equation
2 Quadratic equation
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