MIL-PRF-1/806J
TABLE 1. Testing and inspection - Continued.
Inspection
Method
Notes
Conditions
Symbol
Limits
Limits
Units
MIL-STD-1311
Min
Max
Conformance
inspection, part 3
Life test
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5/
Group B;
---
---
---
---
t = 96 hours "on"
and 1 hour "off"
(tube mounted
horizontally);
t = 500 hours
Life test end points:
---
Operation (1) and
3246
8/
egy
---
140
v
operation (2)
DC anode voltage for
3247
---
egy = 140 v
Ebb
---
2,000
V dc
conduction
µs
Anode delay time
3256
---
egy = 140 v
tad
---
0.70
Ćtad
µs
Anode delay time drift
3256
---
egy = 140 v
---
0.10
µs
Time jitter
3261
---
egy = 140 v
tj
---
0.01
Variable-frequency
1031
10/
No voltages applied
---
---
---
---
vibration
Angle = 24°
Shock
1041
4/ 10/
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---
---
---
Electrical characteristics
---
5/ 10/
epy = 10.0 kv (min);
egy
---
130
v
measured before and
t = 300 sec;
Ebb
---
1,500
V dc
µs
after shock
epy = 3.0 kv (max)
tj
---
0.005
TA = 90°C;
Operation at elevated
3246
5/ 10/
egy
---
130
v
Ef = 6.3 ± 0.50 V ac;
ambient temperature
t = 5.0 hours
1/ For instantaneous starting applications where anode voltage is applied instantaneously, the maximum
permissible epy is 7.0 kv and shall be attained in not less than 0.04 second.
2/ In pulsed operation, the peak inverse voltage, exclusive of a spike of 0.05 µs maximum duration, shall not exceed
2.5 kv during the first 25 µs after the pulse.
3/ The driver pulse, measured at tube socket with thyratron grid disconnected, shall be: egy = 175 v minimum; time
of rise = 0.5 µs maximum; grid pulse duration = 2 µs minimum. Impedance of drive circuit = 1,500 ohms
maximum.
4/ Use clamp as specified on Drawing 243-JAN.
5/ The anode circuit constants shall be so chosen that at epy = 8.0 kv under resonant charging conditions: dik/dt =
1,000 a/µs minimum; ib = 90 a; tp = 0.5 µs ± 10 percent; prr = 3,000. The grid pulse characteristics shall be
tp = 2.0 µs maximum; tr = 0.5 µs minimum; driver impedance = 1,500 ohms minimum.
6/ The grid-drive voltage shall be applied within 10 seconds before application of anode voltage. The tube shall
operate satisfactorily on pushbutton starting within three attempts when the anode voltage (epy) is applied to the
tube under test (TUT) in such a manner as to rise from 0 to 7,000 v within 0.03 second (the filter in the rectifier
shall be so designed that the epy reaches at least 3,500 v within 0.015 second). Any tube failing to start within
three attempts shall be considered a failure.
7/ During the interval between 2 minutes and 7 minutes of the anode delay time test, the change in anode delay
time (Ćtad) relative to the tad value observed on the anode delay time test shall not exceed the specified value.
8/ Anode heating shall not be cause for rejection on operation (1) and operation (2) performed during life-test end
point tests.
9/ This test shall be the first test performed at the conclusion of the holding period.
10/ This test shall be performed during the initial production and once each succeeding 12-calendar months in which
there is production. An accept on zero defect sampling plan shall be used, with sample of three tubes with an
acceptance number of zero. In the event of failure, the test will be made as a part of conformance inspection
part 2, with an acceptance level of 6.5. The "12-calendar month" sampling plan shall be reinstated after three
consecutive samples have been accepted.
3
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