MIL-PRF-1/1712D
TABLE I. Testing and inspection - Continued.
Unit
Limits
Method
Requirement or test
Notes
Conditions
Symbol
Min
Max
Conformance inspection,
part 3
hrs
---
1,000
7/ 8/
t
Group D
Life test
---
Life-test end point:
---
kw
---
3.6
po
Saturated rf power output
3/ 17/
4254
23/
1/
In addition to the MIL-PRF-1 symbols, the following shall apply:
EG and W ....................................... Ethylene glycol and water
GPM ............................................... Gallons per minute
P ..................................................... Pressure
ppm................................................. Parts per million
psig ................................................. Pounds per square inch, gauge
Ćek.................................................. Change in cathode pulse voltage
ĆP ................................................... Pressure drop
Ćθ.................................................... Change in phase
2/
Cathode and one leg of heater shall be connected internally. The helix is operated at ground potential. All voltages are referred to
ground except the heater potential which is referred to the cathode.
3/
The tube shall satisfy all requirements of this tube specification sheet (TSS) when tested in a line type modulator (figure 2 or
equivalent), employing a pulse transformer (ITT Gilfillan PIN 160020, or equivalent). The line type test modulator shall utilize a
pulse forming network whose impedance is within ±10 percent of that shown on figure 2.
4/
A copy of the critical performance characteristics including operating voltages shall be shipped with each tube. The operating
voltages shall also be clearly indicated on the tube label and on a small decal at the collector end of each tube. Each tube delivered
on the contract shall operate optimally under a single combination of discrete voltages which fall within the ranges shown under
absolute ratings. All operating requirements of this TSS shall be met under these specific voltages.
5/
The pulse duration (tp) shall be defined as the time interval between the first and the last instants at which the instantaneous
amplitude reaches 90 percent of the peak pulse amplitude. The combination transition period of rise and fall times of the pulse,
between the 30 and 90 percent amplitude points, shall not exceed 5.0 µs with a duty cycle of 0.03.
6/
Distilled water with a maximum inlet temperature of +62°C shall be used with, (1) specific resistivity maintained greater than 0.5
megohm, (2) oxygen content maintained less than 0.5 ppm, (3) an organic filter, and (4) a 3 to 4 micron filter at ambient
temperatures in excess of +4°C. A 60 percent ethylene glycol and 40 percent distilled water solution, by volume, with a maximum
inlet temperature of +14°C, with the same resistivity, oxygen content, and filters shall be used at ambient temperatures of +4°C and
lower.
7/
The tubes tested and acquired in accordance with this TSS shall be capable of shelf-life for a period of 12 months after date of
shipment from the manufacturer's plant. Tubes placed in operation during this shelf-life period shall meet all requirements of this
TSS. Tubes found to be defective, within the shelf-life period, shall be replaced by the manufacturer at no cost to the Government
or its contractors.
8/
The tube shall be operated in the saturated mode. Test condition shall be defined as operation with power input of not more than
0.7 watt peak and the cathode operated at the optimum voltage.
3
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