MIL-PRF-1/297E
NOTES:
1. This specification sheet uses accept on zero defect sampling plan in accordance with MIL-PRF-1, table III.
2. In handling and mounting the tube, care shall be taken to prevent demagnetization. Magnetic materials or devices
shall not be brought within 2 inches of the tube.
3. The product of the pulse duration in seconds and the pulse recurrence frequency in hertz shall not exceed 0.0007 for
pi = 150 kW, or greater, and shall not exceed 0.001 in any circumstance. The pulse recurrence frequency shall be
325 pps, or greater. During high-voltage pulsed operation, the heater voltage should be varied with input power
approximately in accordance with the formula:
Pi
1
Ef = 6.3
150
where: Ef = 0 for all values of Pi greater than 150. The heater should be protected against input pulse power by an
appropriate filter.
4. With an airflow, at standard atmospheric pressure, of 65 cfm directed at the cooling fins from an orifice of 1-11/64
inches (29.77 mm) by 1-23/64 inches (34.53 mm), the rise above the ambient temperature specified shall not be
exceeded. The orifice shall be located 0.25 inch (6.35 mm) from the cooling fins.
5. The missing pulses shall be counted during any 3 minutes of a test interval of 6 minutes, or less. A missing pulse is
defined as one whose energy within a 1 percent frequency range of the normal test frequency is 70 percent of a
normal pulse, or less.
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