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|  MIL-E-1/188H
TABLE I. Testing and inspection - Continued.
MIL-STD-1311
Requirement or test
Notes
Conditions
Symbol
Limits
Units
Test method
Min
Max
Conformance inspection,
part 3 - Continued
1501
Intermittent life
11/
Ehk = +200 V dc;
---
---
---
---
Rg/g = 1.0 Meg
---
Intermittent life-test end
point: (1,000 hours)
1211
Insulation of electrodes
---
---
---
---
1501
Intermittent life (high
11/
Ehk = +200 V dc;
---
---
---
---
temperature)
Rg/g = 1.0 Meg;
TE = 220C (min)
---
Intermittent life (high
temperature) - test end
points: (1,000 hours)
A dc
1266
Total grid current
2/
Eb = 150 V dc;
Ic
0
-0.9
Rk = 300 ohms;
Rg = 1.0 Meg
1301
Heater current
If
276
328
mA
ĆSm
---
25
%
1306
Change in transconduct-
2/
ance (1) of individual
t
tubes
ĆSm
1306
Transconductance (2)
2/
Ef = 5.7 V
---
20
%
Ef
A dc
1336
Heater-cathode leakage
2/
Ihk
---
10
1211
Insulation of electrodes
2/
---
---
---
---
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
V
V dc
V dc
Ohms
Meg
7.5
0
150
500
1.0
4
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