MIL-PRF-27/69C
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.
Power level: 500 milliwatts maximum at 200 hertz.
Working voltage: 175 volts.
Frequency range: 200 hertz to 20 kilohertz.
TABLE I. Electrical ratings. 1/
Primary
Secondary
Primary
Secondary
Primary
Dash
Circuit
impedance
impedance
DCR
DCR
unbalanced
number
diagram
ohms
ohms
ohms
ohm
DC current
± 25%
± 25%
(see figure 1)
(1-3)
(4-6)
max
(mA)
01
A
25k CT
1,000 CT
2,700
150
0
02
A
10k CT
10 k CT
1,100
1,200
1.0
03
A
10k CT
1,500 CT
1,100
180
1.0
04
A
10k CT
600 CT
1,100
75
1.0
05
B
10k CT
4
1,100
0.5
1.0
06
A
4,000 CT
10 k CT
440
1,200
1.5
07
B
1,500 CT
15
170
1.8
2.5
08
A
1 k CT
600 CT
105
75
3.0
09
B
1 k CT
4
105
0.5
3.0
10
A
600 CT
25 k CT
65
4.0
3,700
11
A
600 CT
600 CT
65
4.0
75
12
B
600 CT
60
65
2.0
7
13
B
600 CT
15
65
2.0
2
14
B
600 CT
4
65
2.0
0.5
15
A
250 CT
600 CT
30
2.0
75
1/ Qualification testing and approval to M27/69-01 shall be sufficient to grant qualification approval to
M27/69-02 through M27/69-15, inclusive. Qualification by similarity can be obtained for MIL-PRF
-27/67, /68, /70, /71, and /72 by the submission of two samples each, (of dash number 01 for
MIL-PRF-27/67, /68, /70, /71, and /72) which shall be subject 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.
3
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