MIL-PRF-27/67C
REQUIREMENTS: (When numbers in parentheses, i.e., (1.-3) are used, they indicate the winding and the extreme
terminals of the winding.)
Electrical ratings: See table I.
Frequency range: 60 hertz to 10 kilohertz.
Power level: 500 milliwatts maximum at 60 hertz.
TABLE I. Electrical ratings. 1/
Primary
Secondary
Primary
Secondary
Primary
Dash
Circuit
impedance
impedance
DCR
DCR
unbalanced
Working
number
diagram
ohms
ohms
ohms
ohms
DC current
voltage
± 25%
± 25%
max
(see figure 1)
(1-3)
(5-7)
(mA)
(1-3)
(5-7)
355
1.0
900
700
10,000 CT
01
A
10,000 CT
355
1.0
50
700
600 CT
02
A
10,000 CT
355
1.0
0.37
700
4
03
B
10,000 CT
175
2.5
1.2
93
15
04
B
1,500 CT
175
3.0
50
65
600 CT
05
A
1,000 CT
175
3.0
0.37
65
4
06
B
1,000 CT
175
4.0
50
37
600 CT
07
600 CT
A
175
4.0
5
37
60 CT
08
600 CT
A
175
4.0
1.2
37
15
09
600 CT
B
175
4.0
0.37
37
4
10
600 CT
B
7.0
175
50
16
600 CT
11
250 CT
A
1/ Qualification testing and approval to M27/67-01 shall be sufficient to grant qualification approval to M27/67-02
through M27/67-11, inclusive. Qualification by similarity can be obtained for MIL-PRF-27/68, /69, /70, /71, and
/72 by the submission of two samples each, (of dash number 01 for MIL-PRF-27/68, /69, /70, /71, and /72)
which shall be subjected to group A, subgroup II tests, with zero defects allowed.
Design and construction:
Dimensions and configuration: See figure 1.
Duty cycle: Continuous.
Case: Encapsulated.
Material: Plastic.
Terminals: Pin (printed circuit).
Material: Nickel iron alloy, tin plated.
Diameter: 0.30 ± .005 inch
Length: .500 ± .030 inch.
Weight: 73.71 grams.
Altitude: 70,000 feet, maximum.
3
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