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C4 Manual Rev 7.5.2
The mode switch must be subsequently turned to the SETUP position to clear the
display and resume normal operations. Be sure you remember to restore any
setup parameters that have been changed by the system reset.
3.7.3 Setup parameter integrity checking
Each time the system must rely on a system setup parameter the condition of the
setup parameter table is checked against a replica that the system stores in
another place in memory. If there is any difference between the two copies of the
parameter table, the system will try to determine which table is correct and
restore the incorrect copy. If restoration is not possible, the system will turn off
all heating and cooling, reinitialize the setup parameters to their defaults, and
display
su err
The mode switch must be subsequently turned to the SETUP position to clear the
display and resume normal operations. Be sure you remember to restore any
setup parameters that have been changed by the system reset
3.8 Software Probe Correction (Calibration)
The C4 will allow you to enter data via Setup or Remote mode that will correct
any anomalies in the temperature readings and control at two points. Such
adjustments are sometimes necessary to optimize accuracy at a particular
temperature, or to compensate for differences between raw probe temperature
data and actual temperatures.
Note: The purpose of Software Probe Correction is to allow precise calibration at
two points near the critical points of the user’s testing scheme. It does not replace
the hardware calibration process, nor should it. A number of system health
checks as well as process limits are based upon the raw, or uncorrected,
temperatures reported by the probes. It is important to optimize the hardware
level calibration before using this software calibration method.
Software probe correction is achieved by entering four temperatures, U1, C1, U2,
& C2, for each probe into the setup parameter table. U1 & U2 are the
uncorrected, or displayed, temperatures at two points. C1 & C2 are the corrected,
or actual, temperature at those same two points. Thus to make a correction using
ice water (0/C) and boiling water (100/C) when the display shows 2.3/C for the ice
water and 99/C for the boiling water, the user would enter the following: