CHAPTER THREE
3-2
Positioning the Instrument on the Reference
The calibration reference consists of a ceramic disk for white
calibration measurements and a trap opening for black
calibration measurements. The instrument shoe fits snuggly in
both positions. Refer below for proper positioning.
NOTE: Make sure the calibration reference is clean before use.
Refer to the calibration cleaning procedure in Section Six.
White Reading Position
Black Reading Position
White Ceramic
Disk
Port Opening
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