Delta CS64A User Manual download pdf (Page 12)

5. Sample Quick Test

You can do a quick test using the CS64A simply by wiring the +24V power, placing the

samples one at a time at the standoff distance (1.75 to 2 inches from the bottom of the

CS64A-00), recording the analog readings, and calculating the ratios on a calculator:

Measure Calculate

Sample NIR Red Green Blue Red/NIR Grn/NIR Blu/NIR

Differences in the Red/NIR, Green/NIR and Blue/NIR ratios are used to

differentiate between colors.

Usually, the amplitudes cannot be used directly since they vary with distance, dirt, etc.

Occasionally, it is necessary to use the NIR amplitude to differentiate between shades of

the same color (light and dark gray, for example). If the NIR amplitude is used, be sure

that:

1. The sensor to target distance is tightly controlled,

2. The sensor window is kept clean and/or

3. There is sufficient variation in the NIR amplitude—10% is usually adequate for very

clean and controlled conditions, while more difference will allow for more distance

variation.

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Delta CS64A User Manual Page 12