226 Chapter 14: System Calibration TempScan / MultiScan User's Manual
Calibration Protection
The chassis calibration constants and the calibration password are stored by the TempScan/1100 or
MultiScan/1200 in Non-Volatile RAM (NV-RAM). The password is a safety feature used to prevent
unauthorized personnel from entering Calibration Mode and altering the calibration constants.
As a safeguard, the calibration password and chassis calibration constants are hardware protected. This
protection is enabled by setting the microswitch 9 to the down (0) position on the rear panel DIP
switch. This is the default factory setting and should remain in this position unless purposely
attempting to change the password or chassis constants.
If it is necessary to change the calibration password via the Change Calibration Keyword (
*K)
command, or to recalibrate the chassis, this hardware write protection can be disabled by setting
microswitch 9 to the up (1) position.
CAUTION
CAUTIONCAUTION
CAUTION
To ensure accurate measurements, calibration must only be performed by
authorized personel.
CAUTION
CAUTIONCAUTION
CAUTION
To ensure the integrity of the chassis calibration constants, verify that DIP
microswitch 9 is set in the down (0) position unless you are attempting to change
the calibration password or chassis calibration constants.
CAUTION
CAUTIONCAUTION
CAUTION
Do not perform calibration until after your TempScan/1100 or MultiScan/1200
system has been powered on for at least one hour.
CAUTION
CAUTIONCAUTION
CAUTION
Do not forget to set DIP microswitch 9 back to the down (0) position when
calibration is complete. Otherwise, the calibration password and calibration
chassis constants may be corrupted and normal operation may be disrupted.
Calibration Status
Once the TempScan/1100 or MultiScan/1200 hardware write protection is disabled, you can enter
Calibration Mode via the Enter Calibration Mode (
K) command. When a valid password has been
executed and Calibration Mode has been activated, Bit 7 in the Calibration Status Register (
CSR
) will
be set. This bit is cleared by the End Calibration Mode (
E) command.
During Calibration Mode, the TempScan/1100 or MultiScan/1200 unit will be in one of two states: Idle
or command active. Whenever a calibration command is active, Bit 6 in the Calibration Status Register
(
CSR) will be set and the TRIGGER LED indicator will flash for a few seconds. Once all of the
indicators are off, the unit will return to an idle state, and Bit 6 in the
CSR will be cleared and ready for
the next calibration command. At this point, the next step in the procedure can be started. For more
information on Calibration Mode, see commands Enter Calibration Mode (
K) and End Calibration
Mode (
E) in the chapter API Command Reference. For more information on the Calibration Status
Register (
CSR), see chapter System Operation.
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