TM 1-1500-204-23-4
Table 4-2. Scale Error (Three Pointer)
Equivalent atmospheric
pressure (mercury)
Altitude
Tolerance
test
( feet)
pressure
at
(feet)
(mm)
(inches)
±
25°C
0
760.00
29.921
30
500
746.37
29.385
35
1,000
732.93
28.856
35
1,500
719.70
28.335
40
2,000
706.65
27.821
40
2,500
693.80
27.315
45
3,000
681.14
26.817
45
4,000
656.38
25.842
50
5,000
632.36
24.896
55
6,000
609.05
23.978
60
8,000
564.51
22.224
70
10,000
522.65
20.577
80
12,000
483.34
19.029
90
14,000
446.46
17.577
100
15,000
428.90
16.886
105
16,000
411.90
16.216
110
18,000
379.53
14.942
120
20,000
349.25
13.750
130
22,000
320.96
12.636
140
25,000
282.03
11.103
155
30,000
225.69
8.885
180
Table 4-3. Test Tolerances (Three Pointer)
Tolerance
Test
(feet)
Case leak test ............................................ ±100
Hysteresis test:
First test point (16,000)
75
Second test point (12,000)
75
After-effect test .............................................. 30
Table 4-4. Friction Test Tolerances
(Three Pointer)
Altitude
Tolerance
(feet)
(feet)
1,000...........................................
±70
2,000...........................................
70
3,000...........................................
70
5,000...........................................
70
10,000...........................................
80
15,000...........................................
90
20,000...........................................
100
25,000...........................................
120
30,000...........................................
140
Change 3 4-17
