MIL-PRF-27/68C
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 100 hertz.
Working voltage: 175 volts (except 355 volts on M27/68-07).
Frequency range: 100 hertz to 8 kilohertz (except 100 hertz to 8 kilohertz on M27/68-01).
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)
(5-7)
max
(mA)
A
10k CT
10k CT
700
1,000
01
1.0
A
10k CT
600 CT
700
60
02
1.0
B
10k CT
4
700
0.4
03
1.0
B
1,500 CT
15
105
1.5
04
2.5
A
1,000 CT
600 CT
70
60
05
3.0
B
1,000 CT
4
70
0.4
06
3.0
A
600 CT
25k CT
42
6
07
4.0
A
600 CT
600 CT
42
2,600
08
4.0
B
600 CT
60
42
6
09
4.0
B
600 CT
15
42
1.5
10
4.0
B
600 CT
4
42
11
0.4
4.0
A
250 CT
600 CT
17
12
60
7.0
1/ Qualification testing and approval to M27/68-01 and all tests in accordance with table VII of
MIL-PRF-27 for M27/68-07 shall be sufficient to grant qualification approval to M27/68-01
through M27/68-12, inclusive. Qualification by similarity can be obtained for MIL-PRF-26/67, /69,
/70, /71, and /72 by the submission of two samples each, (of dash number 01 for MIL-PRF-27/67,
/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: .030 ± .005 inch.
Length: .500 ± .030 inch.
3
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