MIL-PRF-1/292F
TABLE I. Requirement or test - Continued.
Limits
MIL-STD-1311
Requirement or test
Unit
Notes
Conditions
Symbol
method
Min
Max
Conformance inspection,
part 3
Heater-cycling life-test
1506
Ef = 7.5 V;
---
---
---
---
Ehk = 140 V ac;
Eb = 0;
1 min on, 4 min off
Heater-cycling life-test end
---
point:
µA dc
Heater-cathode
1336
Ihk
---
20
leakage
6 ,7,9 TE = 220°C (min);
Intermittent life
1501
---
---
---
---
Ehk = 117 V ac;
Group E
Intermittent life-test end
---
points
(500 hours):
Heater current
1301
If
135
165
mA
Operation of rectifiers
1353
Io
7.5
---
mA dc
ĆIo
Change in operation of
1353
---
15
%
rectifiers of individual
t
tubes
µA dc
Heater-cathode
1336
Ihk
---
20
leakage
MegΩ
Insulation of
1211
R
50
---
electrodes
Intermittent life-test end
---
points
(1,000 hours):
Heater current
1301
If
135
165
mA
Operation of rectifiers
1353
Io
7.5
---
mA dc
ĆIo
Change in operation of
1353
---
15
%
rectifiers of individual
t
tubes
µA dc
Heater-cathode
1336
Ihk
---
20
leakage
MegΩ
Insulation of
1211
R
25
---
electrodes
See notes at end of table.
3
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