MIL-PRF-1/1239F
TABLE I. Testing and inspection - Continued.
Inspection
Method
Notes
Condition
Symbol
Limits
Unit
MIL-STD-1311
Min
Max
Conformance inspection,
part 3
---
Group C; Ib = 180 mA dc;
t
500
---
hours
Life test
6/
F = 400 ±20 MHz;
Ic1 = 30 mA dc (max);
Ec1 = value obtained for Ec1
in electrode voltage (2) test in
accordance with part 1 herein;
Type 6816 Ef = 5.7 V
Type 6884 Ef = 24.0 V
Life-test end points:
---
Pulsing emission
2214
---
etd/ik = 7.5 a
etd
---
400
v
µA dc
Primary grid emission
1266
---
Isg1
---
-4.0
(control)
µA dc
Primary grid emission
1266
---
Isg2
---
-4.0
(screen)
Power output
2214
---
Po
70
---
W
(useful)
Heater-cycling life test
1506
---
Group C; accelerated heater-
---
384
---
Cycles
cycling 2.5 minutes "on", 5
minutes "off"
Type 6816 Ef = 8.5 V
Type 6884 Ef = 35.0 V
Heater-cycling life-test
---
end point:
Heater current
1301
---
If
1.5
2.7
A
Type 6816
If
0.4
0.7
A
Type 6884
Low-frequency vibration
1031
8/
Ec2 = 250 V dc;
Ep
---
300
mV ac
Ec1/Ib = 10 mA dc;
Rp = 2,000 ohms;
Ebb = 300 V dc
High-frequency vibration
1031
8/
No voltages
---
---
---
---
Shock
1042
8/
Test condition A
---
---
---
---
Vibration and shock-test
---
end points:
µA dc
Total grid current
1266
Ec1/Ib = 115 mA dc
Ic1
---
-8
6/
Electrode voltage (1)
1261
Ec1/Ib = 115 mA dc
Ec1
-6
-15
---
V dc
(grid)
See footnotes at top of next page.
3
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