Instruction manual

361T
DENSITOMETER
4-1
4. Calibration
General Information
The X-Rite 361T is designed for long life and extremely stable
measurements. To follow good quality control practice, you should
check Density and Dot calibration periodically to verify measurement
accuracy and proper operation of your unit. To verify and perform
Density calibration, a calibrated transmission reference has been
provided. The transmission reference has a five step gray scale ranging
from approximately 0.06D (step 1) to 4.0D (step 5).
Frequency of Calibration
Under normal operating conditions, the instrument should be calibrated
once a week or when instrument displays a message regarding
calibration.
Density Calibration Check
To check density calibration, first zero the unit, and then measure the
"cal" step on the transmission reference. If the measurement is within
.02D of the densities specified, the unit is properly calibrated. If not, the
unit must be recalibrated (see "Density Calibration Procedure" in
Chapter 4).
NOTE: On the transmission reference, step 4 (CAL) is used for
calibration, and steps 1, 2, 3, and 5 are used for checking the
linearity of the unit.
Density Calibration Procedure
Handle the transmission reference at the edges only. Fingerprints or any
other foreign substances on the measurement area will cause errors.
Attempts to dust or clean the surface with anything other than a soft
camel hair brush may change densities. Minimize change by storing in a
dark, cool, dry place.
1. Depress [
FUNCTION] and [COLOR] keys at the same time until "N
Dcal Y" is displayed.
2. Depress [
ZERO] for YES.
3. Depress [
FUNCTION] for NO.
4. Calibration Hi value for Ortho is displayed. (If value is correct skip
to Step 6.)