MIL-PRF-1/1260K
TABLE I. Testing and inspection - Continued.
Inspection
Method
Notes
Conditions
Acceptance
Symbol
Limits
Unit
MIL-STD-
Level 21/
Min
Max
1311
Conformance inspection,
part 2 - Continued
µA dc
1336
---
Ehk = -100 V dc
Ihk
---
100
Heater-cathode leakage
---
Ehk = +50 V dc
µs
Anode delay time
3256
---
Operation (1); t = 120
---
tad
---
0.6
Ćtad
µs
Anode delay time drift
3256
16/
Anode delay time
---
---
0.15
Time jitter
3261
7/
epy = 500 v (max);
---
tj
---
4.0
ns
egy = 175 v
Conformance inspection,
part 3
---
7/ 17/ Group C; epy = 1,200 v;
---
---
---
---
---
Life test
egy = 140 v; ib = 20a;
prr = adjust for Ip
= 1.0 A ac; t = 500 hours
Group C, establishment
---
---
---
---
---
---
---
of prerelease eligibility
Life-test end points:
---
---
Operation (1)
3246
---
egy
---
140
v
Ćtad
µs
---
Anode delay time drift
3256
---
egy = 140 v
---
0.2
---
Time jitter
3261
---
egy = 175 v
---
5.0
tj
ns
Voltage drop
3204
---
---
---
130
etd
v
Ef = 7.0 V; 10 tubes
Heater-cycling life
1506
---
---
---
---
---
18/
Ehk = -100 V dc;
Ec = Ebb = 0
Heater-cycling life-test
---
---
end points:
µA
Heater-cathode
1336
---
Ehk = +50 V dc
Ihk
---
125
---
leakage
Ehk = -100 V dc
Pressure = 20 ± 5 mmHg;
Barometric pressure,
1002
20/
---
---
---
---
---
reduced (type 7191)
Ebb = 1,400 V;
egy = 0; Rp = Rg = 1,000
ohms; Ehk = -100 V
Sweep-frequency
1031
7/ 8/
t = 120 minutes in 3
---
---
---
---
---
vibration (2)
20/
planes; 40 min/plane
No voltages applied
---
Vibration fatigue
1031
---
---
---
---
20/
7/ 20/ TA = +125°C; t = 300
Operation at elevated
3246
---
egy
---
130
v
ambient temperature
(min)
See footnotes at top of next page.
3
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