MIL-PRF-1/1392D
TABLE I. Testing and inspection - Continued.
5/
Blue/orange light ratio.
(a) Using tungsten standard luminant A, calibrate Weston Photronic Cell No. 594-R-R, or equivalent, with Corning 4-65 filter, or
equivalent, at 10-foot candles. This combination approximates the normal eye response.
(b) Set up a 7.1 cm by 7.1 cm defocused raster on the cathode-ray tube under test and adjust the grid potential for a brightness
reading of 10-foot lamberts when viewed through a Wratten 15 filter, or equivalent, by the Photronic cell and filter previously
standardized.
(c) Without disturbing the Photronic cell, replace Wratten 15 and Corning 4-65 filters with Corning 5-59 filter, or equivalent, and
again measure the indicated brightness in apparent foot lamberts. The thickness of the filters shall be 2.95 and 5.13 mm,
respectively.
(d) Calculate blue/orange light ratio as follows:
Apparent foot lamberts as measured
with Corning 5 - 59 filter, or equivalent
Blue / orange light ratio =
10 - foot lamberts
6/ The distance between the center of the unfocused, undeflected spot at low intensity (Ec1 near cutoff) and the center of the image of
the masking aperture observed at high intensity of the unfocused, undeflected spot shall not exceed the limit specified. Ec1 should
not be held at zero for more than approximately 30 seconds to prevent damage to the screen.
7/ The standard deflection yoke spacer (see figure 2) shall be placed on the tube neck so as to fit tightly between the cone of the glass
envelope and the standard 70° deflection yoke, JEDEC-120. Focus coil No. 109 shall be located in the same position with respect
to the deflection yoke as for other tests made without the spacer. The electron beam shall be deflected by means of horizontal and
vertical deflection waveforms adjusted in magnitude to overscan the useful screen area; if there is no neck shadow the raster shall
display 35 to 100 lines. Increase the focus current until the raster passes to a defocused condition with the raster lines overlapping
while the ends of the lines become abruptly terminated producing a disk pattern approximately circular in shape having a
circumference in sharp focus. Neck shadow will be evident as an outer annular ring or shadow where the electron beam does not
reach the screen. The focus coil shall be oriented to make the annular ring symmetrical with the tube face. The minimum diameter
of the disk pattern shall be equal to or greater than the specified limit.
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