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Chapter 11 Page no. 1798

JC-PM-A-300.fm

GE Healthcare Senographe DS

Revision 1 Service Information and Procedures Class A 2385072-16-8EN

Job Card PM A300 - 21-inch 3MP Monitor Luminance Checks

series. Ensure that the title of the displayed image is TG18-UNL10 Pattern.

13. With the TG18-UNL10 Pattern displayed, use the luminance meter to measure the luminance value

at the center of five quadrants D1 to D5 illustrated above. Insert the measured luminance values for

each quadrant into the following rows of Table 1 on page 1800 :

• D1: top left quadrant

• D2: top right quadrant

• D3: bottom left quadrant

• D4: bottom right quadrant

• D5: center quadrant

14. Calculate the black non-uniformity value as follows:

a. From the measured luminosity values of each corner quadrant (D1, D2, D3, and D4), determine

the highest luminosity value (BLmax).

b. From the measured luminosity values of each corner quadrant (D1, D2, D3, and D4), determine

the lowest luminosity value (BLmin).

c. The measured luminosity value of the center quadrant is BLcenter.

Calculate the black non-uniformity value as follows: (BLmax - BLmin) / BLcenter. The black non-uni-

formity value must be less than 0.3 for the monitor to pass the black non-uniformity test.

15. Use the Img up/down buttons to select the second image in the series. Ensure that the title of the

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