MIL-PRF-1/160N
TABLE I. Testing and Inspection. - Continued.
Inspection
Method
Notes
Conditions
Symbol
Limits
Limits
Unit
Min
Max
Conformance
inspection, part 3
- Continued.
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---
---
---
Group C; Ec1 = Ec2 =
-
---
Life test (2)
Eb = 0; t = 500 hours;
Ef = 6.6 V ac
---
Life-test (2) end points:
Interelement
Megohm
---
10
Rg1k
Rs = 2.5 Megohm
10
1366
leakage
E = 100 V dc; g1 negative
resistance, cold
Megohm
---
10
Rg1g2
E = 500 V dc; g2 positive
Megohm
---
10
Rg2k
E = 500 V dc; g2 positive
Periodic-check tests
Life test (3)
---
---
---
---
RF useful power
-
---
output (2); t = 500 hours
Life-test (3) end points:
---
Pulsing emission
Primary grid
a
---
21
is
-
1231
emission (control)
-100
---
Isg1
-
1266
Primary grid
µA dc
emission (screen)
-250
---
Isg2
-
1266
Heater-cathode
µA dc
leakage
150
---
Ihk
Ehk = +150 V dc
-
1336
µA dc
150
---
Ihk
Ehk = - 150 V dc
Coolant pressure drop
µA dc
versus coolant flow
0.60
---
---
No voltages applied
4
1155
(forced air)
Inches of
water
Forced cooling
°C
175
---
T(anode
Eb = 1.000 V dc
5
1143
core)
Ec1/Ib = 250 mA dc
°C
150
---
T(anode
seal)
°C
125
---
T(base
Overload
seal)
---
---
---
---
Eb = 1,000 V dc
6
---
Overload end point:
Total grid current
µA dc
-25
---
Ic1
-
1266
NOTES:
1. W hen the tube is operated at 100 percent of maximum rated anode dissipation at an incoming air temperature of 25°C
maximum, a minimum airflow of 5.6 cubic feet per minute (cfm) at sea level shall pass through the anode cooler. The
static pressure drop across the anode cooler at this flow is approximately 0.26 inch of water. If the socket on Drawing
246-JAN (see note 13) is used, an incoming airflow of 5.6 cfm to the grid end of the socket is required. At this flow of
5.6 cfm, the static pressure drop directly across the tube and socket is approximately 0.60 inch of water. This pressure
drop varies with the amount of escaping air and with the shape and construction of the air director. The airflow rating
applies at bias voltages less than 100 volts and frequencies less than 500 MHz. Air cooling of the tube shall be
increased with increased negative grid bias, increased incoming air temperatures, or increased frequency of operation,
or a combination. In all cases of operation, a socket which provides forced-air cooling of the base shall be used and
maximum seal and radiator temperature ratings shall not be exceeded. The airflow shall be applied before or
simultaneously with electrode voltages, and may be removed simultaneously with them.
4
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