非常適用於視訊或光學檢測系統及相機的評估。便利的尺寸 (標稱值為50.8 x 50.8 x 1.5mm) 可供直接檢視,也可使用35mm測試片投影機進行投射。圖案是「標準」,包含兩項刻度:EIA等步長透射率 (線性) 與EIA等步長密度 (對數)。每項刻度有九個步長,穿透率範圍從3%至60% (EIA 20:1)。所有步長都由超精密的半色調圖案準確提供。節距為0.001”。步長採用並列的0.200”x 0.100”,無空白或邊界。穿透率與密度如下所示 (具有嚴格的容差)。刻度採用永久的鉻膜玻璃材料製成,可承受惡劣的環境。背景不透明,其光學密度為3.0 (透射率 = 0.1%)。
Step/Field | Equal Transmission Scale – Linear EIA 20:1 |
Equal Density Scale – Logarithmic EIA 20:1 |
||||||
Density |
% Transmission |
Density |
% Transmission |
|||||
Nominal | Tolerance ± | Nominal | Tolerance ± | Nominal | Tolerance ± | Nominal | Tolerance ± | |
1 | 1.523 | 0.228 | 3.000 | 1.5 | 1.523 | 0.228 | 3.000 | 1.5 |
2 | 0.995 | 0.117 | 10.125 | 2.7 | 1.360 | 0.185 | 4.363 | 1.8 |
3 | 0.763 | 0.088 | 17.250 | 3.5 | 1.198 | 0.150 | 6.344 | 2.2 |
4 | 0.613 | 0.073 | 24.375 | 4.1 | 1.035 | 0.123 | 9.266 | 2.6 |
5 | 0.502 | 0.064 | 31.500 | 4.6 | 0.872 | 0.100 | 13.416 | 3.1 |
6 | 0.413 | 0.058 | 38.625 | 5.1 | 0.710 | 0.080 | 19.510 | 3.7 |
7 | 0.340 | 0.053 | 45.750 | 5.6 | 0.547 | 0.068 | 28.372 | 4.4 |
8 | 0.277 | 0.049 | 52.875 | 6.0 | 0.384 | 0.056 | 41.259 | 5.3 |
9 | 0.222 | 0.046 | 60.000 | 6.4 | 0.222 | 0.046 | 60.000 | 6.4 |
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