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USAF Test Charts

For complete brochure click on this link.

USAF resolution charts are recognised the world over as a universal standard for testing the vertical and horizontal resolution of imaging systems.

Each element on the chart comprises three vertical bars and three horizontal bars, and the detail on these slides is as fine as 0.78 microns (644  line-pairs per mm). The resolution of the imaging system is normally specified as the Group and  Element of the finest bars that can be clearly defined

There are six versions manufactured by Pyser, see images below tables.

The following tables show the USAF data as either line-pairs-per-mm or the actual line/bar sizes in mm:-

 

USAF Resolution Chart, Number of Lines per mm
Element Number Group Number
  -2 -1 0 1 2 3 4 5 6 7 8 9
1 0.25 0.5 1 2 4 8 16 32 64 128 256 512
2 0.28 0.561 1.12 2.24 4.49 8.89 17.95 36 71.8 144 288 576
3 0.315 0.63 1.26 2.52 5.04 10.1 20.16 40.3 80.6 161 322 644
4 0.353 0.707 1.41 2.83 5.66 11.3 22.62 45.3 90.5 181 362  
5 0.397 0.793 1.59 3.17 6.35 12.7 25.39 50.8 102 203 406  
6 0.445 0.891 1.78 3.56 7.13 14.3 28.51 57 114 228 456  

 

USAF Resolution Chart, Width of Bars in mm
Element Number Group Number
  -2 -1 0 1 2 3 4 5 6 7 8 9
1 2 1 0.5 0.25 0.125 0.063 0.031 0.016 0.0078 0.0039 0.002 0.00098
2 1.79 0.89 0.446 0.223 0.111 0.056 0.028 0.014 0.007 0.0035 0.0017 0.00087
3 1.59 0.79 0.396 0.198 0.099 0.05 0.025 0.012 0.0062 0.0031 0.0016 0.00078
4 1.42 0.71 0.355 0.177 0.088 0.044 0.022 0.011 0.0055 0.0028 0.0014  
5 1.26 0.63 0.315 0.158 0.079 0.039 0.02 0.0098 0.0049 0.0025 0.0012  
6 1.12 0.56 0.281 0.14 0.07 0.035 0.018 0.0088 0.0044 0.0022 0.0011  

USAF Test Charts

Results 1 - 6 of 6
r70_med

R70 USAF Positive Test Chart

Group 0 to group 7, element 6
r71_med

R71 USAF Positive Test Chart

Groups -2 to group 7, element 6.
grq50018

R75P High Resolution Positive Image

Group 0 to group 9, Element 3 Sub...
resolution chart - inverted7

R75N High Resolution Negative Image

Sub micron minimum feature size Group...
grq50011

PS75P Slide Format, High Resolution...

Group 2 to group 9/3, positive...
resolution chart - inverted

PS75N Slide Format, High Resolution...

Group 2 to group 9/3, negative...