MIL-E-1/188J
TABLE I. Testing and inspection - Continued.
Limits
MIL-STD-1311
Requirement or test
Units
Notes
Conditions
Symbol
Method
Min
Max
Conformance inspection,
part 3 - Continued
Intermittent life
1501
11/
Ehk = +200 V dc;
---
---
---
---
Rg/g = 1.0 MegΩ
Intermittent life-test end
---
point: (1,000 hours)
Insulation of electrodes
1211
---
---
---
---
Intermittent life (high
1501
11/
Ehk = +200 V dc;
---
---
---
---
Rg/g = 1.0 MegΩ;
temperature)
TE = 220°C (min)
Intermittent life (high
---
temperature) - test end
points: (1,000 hours)
Total grid current
1266
2/
Eb = 150 V dc;
Ic
0
-0.9
µA dc
Rk = 300 ohms;
Rg = 1.0 MegΩ
Heater current
1301
If
276
328
mA
ΔSm
Change in transconduct-
1306
2/
---
25
%
ance (1) of individual
T
tubes
ΔSm
Transconductance (2)
1306
2/
Ef = 5.7 V
---
20
%
Ef
Heater-cathode leakage
1336
2/
Ihk
---
10
µA dc
Insulation of electrodes
1211
2/
---
---
---
---
NOTES:
1/
The additional test requirements specified for tube type 6021WSPL are intended to provide a tube that will
consistently operate satisfactorily in the PRF circuit of the modulator unit of the AN/ARN-21 Tacan set.
2/
Test each unit separately.
3/
This test shall be performed at the conclusion of the holding period.
4/
Tie 1k to 2k; 1g to 2g; and 1a to 2a.
5/
The rejection level shall be set at the VU meter reading obtained during calibration.
6/
Prior to this test, the TUT shall be preheated a minimum of 5 minutes with both sections operating at the
conditions specified below. The 3-minute test shall not be permitted. Test at specified conditions within 3
seconds after preheating. Grid emission shall be the last test performed on the sample selected for the grid
emission test.
Ef
Ec
Eb
Rk
Rg
MegΩ
V
V dc
V dc
Ohms
7.5
0
150
500
1.0
4
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