Delta CS64A - Manual (Page 11)

11
4. Adjustment
The CS64A-00 is factory calibrated to read Spectralon as 9.50V on all four colors (100%
ratios) at 1.75” standoff. (Refer to specification table for standoff distance for other
models). Spectralon has >99% reflectance over the visible/NIR spectrum. (The 9.50V
setting ensures that the outputs do not exceed 10V over the full sensing range). You can
either maintain this calibration or match the calibration to your application.
In any case, you should define a calibration standard using either a white calibration
standard material or the lightest material that the sensor will see. Make the calibration
piece large (preferably about 4” square) for ease of alignment. The calibration material
must be opaque in the visible and NIR ranges. If this is not possible, bond a piece of
opaque material (e.g. flat black aluminum plate) to the reverse side of the calibration
piece.
Either adjust to specified values using the standard or record the factory values for future
reference. Refer to Section 7 for recalibration period recommendations.
Tip: If you decide to establish your own calibration standard, you should do so before
setting up ratio thresholds for your application. Otherwise, if you change the relative
amplitudes of the CS64A color outputs, you will need to change your ratio thresholds as
well.
For best results, adjust the gain with the CS64A at normal operating temperature and in a
normal mounting position, etc. Let it warm up for 15 minutes or more.
To calibrate the CS64A, place your calibration material under the sensor at the normal
standoff distance (1.75" for CS64A-00) and adjust for each output to read 8.5 volts (9.0
volts for very white material).
If possible, for maximum convenience, adjust the gains in software, or in the analog
circuitry to which the CS64A is connected, rather than using the pots inside the CS64A.
If you choose to use the pots in the CS64A, they are located as shown below.
Color 1 Color 2 Color 3 Color 4
Blue NIR Red Green