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Table I. Testing and inspection - Continued. |
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|  MIL-E-1/83G
TABLE I. Testing and inspection - Continued.
6/ Use miniature steatite socket with grounded shield base. Shield the anode power supply. Use short shielded
anode and grid leads. Anode and grid resistors shall be noninductive. Connect the grid resistor directly at
socket.
7/ No voltages shall be applied to the tube for 20 minutes minimum preceding this test.
8/ Thirty seconds maximum in the operation test socket is permitted before reading. There shall be no evidence of
amplitude jitter. The tube shall be tested in the circuit shown on figure 1. The circuit constants shall be so chose
that: at epy = 1,000 v under resonant charging conditions, dik/dt = 100 a/s minimum, tp = 2.0 s 10 percent,
prr = 500. The grid pulse characteristic at egy = 100 v shall be: tp = 2.0 s maximum, tr = 0.5 s minimum,
driver impedance = 500 ohms minimum.
9/ Read electrode insulation between g2 and anode with all other elements floating.
10/
Preheat for 15 minutes under the following conditions: Ef = 7.0 V; Epp = 220 V ac; Ecc1 = Ecc2 = 0; Rg1 = 10
Meg; Ib = 100 mA dc. Two seconds shall be the maximum time between preheat and test.
11/
Preheat using Ef = 5.7 V.
12/
Egg1 supply shall be in phase with Epp supply and Egg2 supply 180 degrees out of phase with Epp supply.
13/
Vary Egg2 supply and read Egg2 at which conduction occurs.
14/
The no-load to steady-state full-load regulation of the heater-voltage supply shall not be more than 3.0 percent.
This test shall be made on a lot-by-lot basis.
15/
Phase of grid voltage adjusted to provide start of conduction at peak applied anode voltage.
16/
Envelope temperature (TE) is defined as the highest temperature indicated when using a thermocouple of No.
30 B&S or smaller diameter elements welded to a ring of .025-inch diameter phosphor bronze in contact with
the envelope. The envelope temperature requirement will be satisfied if a tube, which draws 80 mA dc (5
percent) anode current and 500 ma (5 percent) peak anode current under the life-test conditions, is
determined to operate at, or above, the minimum specified temperature at any position on the life-test rack.
17/
Adjust epy for ib = 20a initially, and maintain this epy value throughout the life test. The tube shall be tested in
the circuit shown on figure 1. The circuit constants shall be so chosen that: at epy = 500 v under resonant
charging conditions, dik/dt = 100 a/s minimum, tp = 2.0 s 10 percent, prr = 1,000. The grid pulse
characteristic at egy = 100 v shall be: tp = 2.0 s maximum, tr = 0.5 s minimum, driver impedance = 500
ohms minimum.
6
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