MIL-PRF-1/1221D
TABLE I. Testing and inspection - Continued.
1/
See "Reduced pressure (altitude) rating", and altitude, maximum peak voltage in the basic document.
2/
Each unit shall be read separately. Control grid of unit not under test shall be connected to -20 V dc.
3/
The duration of the test shall not exceed 5 seconds.
4/
This test to be performed at the conclusion of the holding period.
5/
Test both units in parallel. Ec1 shall be sufficient to cutoff the tube. The positive portion of the grid pulse shall be a rectangular
wave meeting the pulse characteristic requirements of MIL-STD-1311 method 1296. In addition, the maximum amplitude shall
occur within the first 20 percent of tp. The pulse shall be applied to the grid by means of a driving circuit which produces the
specified peak pulse voltage directly at the grid terminal with respect to cathode. Grid resistance, not exceeding 50-ohms may be
inserted to prevent oscillation, provided readjustment of grid drive is made to maintain the specified pulse amplitude directly at the
grid terminal. Peak currents shall be measured by a high impedance oscilloscope, or equivalent device, connected across the 1-
ohm ± 1 percent cathode resistor. The specified limit refers to the maximum pulse amplitude.
6/
Each unit shall be tested separately.
7/
Voltage shall be applied in series with a 10 megohm ± 10% resistor.
8/
Primary grid-emission tests shall be the last tests performed on the sample selected for conformance inspection, part 2. Primary
grid emission (control) shall be read prior to primary grid emission (screen).
9/
The vibration-fatigue test shall be conducted on the initial lot and thereafter on a lot approximately every 6 months. W hen one lot
has passed, the 6-month rule shall apply. In the event of lot failure, the lot shall be rejected and the succeeding lots shall be
subjected to this test until a lot passes. Sample size of 13 shall apply.
10/
Anode and screen voltage shall be applied intermittently, 2 minutes "on", 8 minutes "off".
11/
This specification sheet uses accept on zero defect sampling in accordance with MIL-PRF-1, table III.
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