MIL-PRF-1/825E
NOTES:
1.
Internal connections, do not use.
2.
See "Reduced pressure (altitude) rating", and altitude, maximum peak voltage in the basic document.
3.
Cycle (or vary) the tube current between 1.5 and 3.5 mA.
4.
Conditions for this test shall be those of ionization voltage (1), except testing shall be done in total darkness, and the tube
shall not have conducted or have been exposed to light for at least 24 hours prior to testing.
5.
Repeatability shall be defined as the maximum shift in tube voltage drop between successive firings of the tubs. The tube
shall be tested in the following manner:
(a)
The voltage drop shall be read at, 2.5 mAdc drain.
(b)
The tube shall be turned off for 1 minute.
(c)
The tube shall be restarted and operated at the same current.
(d)
The voltage drop shall be read after 1 minute of operation.
(e)
The "on-off" cycle shall be repeated a minimum of five times. The maximum difference in tube voltage drop shall be
taken as the measure of repeatability.
6.
This test shall be conducted on the initial lot and thereafter on a lot approximately every 6-months. When one lot has
passed, the 6-month rule shall apply.
7.
Envelope temperature (TE) requirements, when measured in accordance with the temperature by conduction-band
measurement (method 1226), will be satisfied if a tube having bogey tube drop (Etd = ±3 percent) under normal test
conditions, is determined to operate at minimum specified temperature at any position in the life-test rack.
8.
This specification sheet utilizes accept on zero defect sampling plan in accordance with MIL-PRF-1, table III.
Referenced documents. In addition to MIL-PRF-1 this document references MIL-STD-1311.
Marginal notations are not used in this revision to identify changes with respect to the previous issue due to the extent of the
changes.
Custodians:
Preparing activity:
Army - CR
DLA-CC
Navy - EC
Air Force - 85
(Project 5960-2008-067)
DLA - CC
Review activities:
Army - AR
Navy - AS, CG, MC, OS, SH
Air Force - 99
NOTE: The activities listed above were interested in this document as of the date of this document. Since organizations and
responsibilities can change, you should verify the currency of the information above using the ASSIST Online database at
4
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