Today there are a myriad of off-the-shelf test targets and charts on various substrate materials and in a wide range of sizes from a multitude of companies for general or specific applications. To help narrow your chose of the best target/chart for your application it requires some forethought and answers to some basic questions. The following seven general questions will aid in choosing that ideal test target/chart.
Answering these seven simple questions will begin to narrow down the choices for your ideal target/chart for your specific application:
Further consideration –
There are two basic classifications for targets and charts. They are defined as a single featured target or multi-featured chart.
- An example of a single featured target would be similar to the USAF-1951 target, a Ronchi grating or a Siemens Star target. While these charts can be used for multiple types of analysis, they consists of one design style repeated multiple times in varying sizes.
- An example of a multiple featured chart would be similar to the ISO-12233 Digital Still Camera Resolution chart or the AIIM X113 Rotary Test chart. These charts have multiple/various features within the chart which can be used to analyze for different parameters……
These two basic classifications are applicable to all substrate materials.
Targets and Charts can be used for various analysis, such as calibration, alignment, measurement, distortion, resolution or image quality, to name a few.
Calibration. X Scale or X & Y Scale.
Alignment. Pick ’n’ Place, Checkerboard or Dot target.
Measurement. Reticle & X&Y Scale.
Distortion. Ronchi grating, dot pattern target, checkerboard target
Resolution. Ronchi grating, Siemens Star target, RIT Target
Image Quality. ISO-12233, Sinusoidal target array