IOtech MultiScan 1200, User Manual

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158 Chapter 11: ScanCal 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. For more information on calibration, see chapter System
Calibration .
CAUTION CAUTION CAUTION CAUTION
To ensure accurate measurements, calibration must only be performed by
authorized personel.
CAUTION
CAUTION CAUTION
CAUTION
Do not perform calibration until after your TempScan/1100 or MultiScan/1200
system has been powered on for at least one hour.
CAUTION CAUTION CAUTION 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
CAUTION CAUTION
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.