MIL-PRF-27/30C
Secondary (terminals 7, 8, 9, 10, 11, and 12):
Impedance: See table II.
Direct current: Zero.
Frequency response:
2 dB: 10 Hz to 20 kHz.
6 dB: 50 kHz.
Polarity: Terminals 1 and 12 shall be the same polarity.
Marking location: See figure 1.
Part or Identification Number (PIN): M27/30-01.
TABLE I. Primary impedance at 2000 Hz.
Primary
Connect to
Join to
impedance
terminal
terminal
Ohms ±5%
2 to 3 and 4 to 5
2 and 4
70
1 to 3 and 4 to 6
1 and 4
165 or 180
3 to 4
2 and 5
280 or 325
3 to 4
1 and 5
425
3 to 4
1 and 6
625 or 725
TABLE II. Secondary impedance.
Primary
Connect to
Join to
impedance
terminal
terminal
Ohms
8 to 9 and 10 to 11
8 and 10
50
7 to 9 and 10 to 12
7 and 10
125 or 150
9 to 10
8 and 11
200 or 250
9 to 10
7 and 11
333
9 to 10
7 and 12
500 or 600
Changes from previous issue. The margins of this specification are marked with vertical lines to indicate where
changes from the previous issue were made. This was done as a convenience only and the Government assumes no
liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the
requirements of this document based on the entire content irrespective of the marginal notations and relationship to
the last previous issue.
Referenced documents. In addition to MIL-PRF-27, this document references the following:
MIL-STD-202
3
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