Measurement Computing TempScan/1100 - Manual (Page 118)

6-2 System Calibration 879596 TempScan / MultiScan User's Manual
Calibration Setup
Calibration Properties
For proper results, the TempScan/1100 or MultiScan/1200 master chassis and each scanning card must be
calibrated separately. The master chassis contains an on-board battery-backed-up NV-RAM (Non-Volatile
Random-Access Memory) and each card contains an on-board EEPROM (Electronically Erasable
Programmable Read-Only Memory) for saving calibration constants, allowing for card-swapping within a
system, card-swapping between systems, as well as system expansion. Calibration relates to the master
chassis and scanning cards as follows:
*0 Master Chassis: Calibrated for channel offset and channel gain only.
*1 Option Cards: Calibrated for channel offset, channel gain, and cold junction sensor offset (if
thermocouples are used).
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
To ensure accurate measurements, calibration must only be performed by
authorized personnel.
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
Do not perform calibration until after your TempScan/1100 or MultiScan/1200
system has been powered on for at least one hour.
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.