MIL-PRF-1/1049H
TABLE I. Testing and inspection - Continued.
15/ The test equipment used for this test shall be approved by the qualifying activity prior to the start of testing. W hen the tube screen is
observed with a 2.5 power magnifier and with no radiation incident on photocathode, there shall be no ion spots or cold emission that
appear as bright streaks or blemishes. Spots less than .0008 inch (0.020 mm) in diameter will not be counted, however, there shall
be no unacceptable concentration of such spots. There shall be no flickering or pulsating light during functional testing for
blemishes. The intensity of light in the right and left sides shall appear to be equal. Any spots that change from light to dark or dark
to light, in the fluorescent screen, shall be cause for reject. W hen the screen is viewed through a 10 power microscope and with the
radiation level on the photocathode adjusted to obtain the best spot contrast, the opaque or dark spots shall not exceed the size and
quantities shown:
Inches
Millimeters
A
0.860
21.84
B
0.300
7.62
Size of spots 1/
Number of spots within .300 inch
Number of spots, within area
(inches)
(7.62 mm) diameter circle 2/
bounded by two circles .300 inch
(7.62 mm) and .860 inch (21.84
mm) in diameter 3/
10
3
.0008 to .0016 (0.020 to 0.041 mm)
8
0
.0016 to .006 (0.041 to 0.15 mm)
5
0
.006 to .009 (0.15 to 0.23 mm)
2
0
.009 to 0.012 (0.23 to 0.30 mm)
0
0
Greater than .012 (0.30 mm)
1/ If the distance between two spots is less than the maximum dimension of either spot, they shall be
considered as one spot with a size equal to the sum of the maximum dimensions of the two spots
plus the amount of separation between them.
2/ The .300 inch (7.62 mm) and .860 inch (21.84 mm) circles on the image screen shall be concentric
with the tube axis.
3/ There shall not be more than two spots, blemishes, or scratches in each of the four quadrants except
sizes .0008 to .0016 inch (0.020 to 0.041 mm) wherein two of the four quadrants may contain three spots.
16/ Apply 18 kilovolts for 10 seconds. The tube shall be rejected for intermittent or continuous arcing.
17/ To measure total tube dark current LIk, a microammeter shall be connected in series with the grounding terminal of the tube. This
test shall be performed in an atmospheric environment of 40 to 50 percent relative humidity.
5
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business