HunterLab SpectraTrend HT, User Manual

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SpectraTrend HT User’s Guide 3.2
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measures height by detecting the angle of the light reflected to the sensor, height is not
measured absolutely, and all heights are relative. Therefore, the
MAX HEIGHT distance
cannot be determined with a ruler. Instead, perform the MAX HEIGHT determination
procedure using the DISTANCE SENSOR in the DIAGNOSTIC MENU and enter the value
obtained as this parameter in the setup.
Figure 68. Distance and Height Parameters (Page 4)
PRODUCT SETUP, (TAB) PAGE 4: FILTER COEF
The FILTER COEFF function, when enabled, allows you to smooth the output data
without extending the update period. The output data may be smoothed by using the
TIME AVERAGE read mode and a large number (such as 60 seconds). However, this
method could constrain the system to providing a reading only every 60 seconds, which
is unacceptable for some on-line processes. The
FILTER COEFF function can provide the
same filtering effect as a long sample time while maintaining a worst-case sample time
of about one second.
The filter works by allowing you to select the ratio of old data to new data in each
update. The
FILTER COEFF function performs the following transfer function on the
calculated color data prior to reporting:
VALUE_OUT = [NEW-VALUE X (1 - FILTER)] + OLD-VALUE X (FILTER)]
Enter an integer between 0 (off) and 90 (max effect).