HunterLab SpectraTrend HT, User Manual

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SpectraTrend HT User’s Guide 3.2
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Figure 78. Examples of Standardization Errors
The frequency with which standardization must be performed depends on the operating
conditions, including the temperature at the sensor and the build-up of dirt and
contaminants on the sensor window. Standardization must be performed at intervals
which are short compared to the time required for significant color measurement
changes to occur. These changes may be evaluated by simply reading the instrument
standard in the calibrator and observing the changes over time.
Note: Distance calibration is performed at the factory and does not need
regular checking .
Taking Readings
When the color or height of the product being read changes drastically, HunterLab
recommends allowing time for the readings to stabilize before recording them. The length of
time required for the readings to stabilize is a function of the current setting of the Read Time
and Filter parameters.
Reading Individual Samples
Complete the following steps to take individual (non-averaged) readings using the SpectraTrend
HT
:
Note: These instructions apply when Average in the product setup is set to OFF.
•
Select READ from the SpectraTrend main menu. Move the cursor highlight to its
position using the UP and DOWN ARROW buttons and then press the GO button.