MIL-DTL-3971/2E
TABLE I. Specification data for type II meters.
DASH NO.
FIG
A
B
C
D
E
F
G
Grade
Hz
Range
Readout
2.210 3.00 ⎯
⎯
1
1
2.695
1.220
.125
A
60
100,000 99999.9
2.625 3.00 ⎯
⎯
2
1
3.500
1.580
.150
A
60
100,000 99999.9
2.210 3.00 ⎯
⎯
3
1
2.875
1.265
.150
A
400
10,000
9999.9
2.625 3.00 ⎯
⎯
4
1
3.500
1.580
.150
A
400
10,000
9999.9
2.210 3.00 ⎯
⎯
5
1
2.695
1.220
.125
B
60
100,000 99999.9
2.625 3.00 ⎯
⎯
6
1
3.500
1.580
.150
B
60
100,000 99999.9
2.210 3.00 ⎯
⎯
7
1
2.875
1.265
.150
B
400
10,000
9999.9
2.625 3.00 ⎯
⎯
8
1
3.500
1.580
.150
B
400
10,000
9999.9
9
2
2.120
1.750
.045
.936 1.950 1.020
1.450
A
60
100,000 99999.9
10
2
2.120
1.750
.045
.936 1.950 1.020
1.450
B
60
100,000 99999.9
Notes:
1. Dimensions are in inches (in.).
Dimensional ± 0.015 in., bolt holes ± .005 in. unless otherwise indicated.
2. Tolerances:
Angular ± 0.5°.
3. Range and readout are in hours and tenths of hours.
1. REQUIREMENTS
1.1 Dimensions of case. See figures 1 and 2 and table I as applicable.
1.2 Colors, elapsed time indicator:
Hours:
White on black background
Tenths:
Black on white background
1.3 Dielectric strength.
Voltage
Dash numbers 1,2,5,6,9 & 10
1000 volts rms
Dash numbers 3,4, 7 & 8
500 volts rms
Frequency
60 Hz
Potential
ac
Points of application
Terminals and case
1.4 Weight. 1.00 lb. maximum.
1.5 Starting. Energize at the rated voltage and frequency for 60 seconds at +22oC + 2oC
(71.6°F ± 3.6°F), de-energize for 180 seconds, repeat 5 times. The meter shall start within 10
seconds of being energized.
3
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