MIL-PRF-1/1056F
TABLE I. Testing and inspection - Continued.
1/
When Ec2 is greater than 330 V dc, Rg1 shall not exceed 0.5 Meg. When Ec2 is less than 330 V dc, Rg1 shall not exceed
1.5 Meg.
2/
This test to be performed at the conclusion of the holding period.
3/
The neck and base straightness shall be determined by the insertion of the tube neck in a cylinder 5 inches (127.00 mm) long
and 1.5 inches (38.10 mm) maximum inside diameter. This cylinder shall move freely between the reference line and the
base of the assembled tube.
4/
The test conditions shall be Eb = 7 kV, Ec2 = 250, focus coil current = 0, Ec1 shall be varied until the focused image of the
cathode is obtained. The percentage of dead area shall be that portion of the image which is black in respect to the general
brilliant area.
5/
There shall be no displacement due to hand capacitance or external electrostatic field.
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 herein. Ec1 shall not be held at zero for more than approximately 30 seconds to prevent damage to the screen.
4
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