MIL-T-27-11 Transformer, Audio Frequency

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MIL-T-27/11B

Electrical characteristics:

Harmonic distortion:  Not more than 1 percent with 173 V, 300 Hz across (1-3) and .020 ampere dc through terminal 2.

No load (center tap voltage unbalance only):  With 173 V, 1,000 Hz across (1-3) and .020 ampere dc through terminal 2.

Unbalance (4-5) and (6-7):  1 percent, maximum. Unbalance (1-2) and (2-3):  1 percent, maximum.

Secondary load impedance:  (4-5) - 150 ohms.

(6-7) - 150 ohms ±10 percent. (4-7) - 600 ohms ct.

Primary impedance:  With approximately 10 V, 1,000 Hz across (1-3) and .020 ampere through terminal 2 and 600 ohms ct across (4-7), the primary impedance shall be 60,000 ohms ct ±10 percent across (1-3). Frequency response:

Range:  300 to 10,000 Hz at rated power, flat within ±2 dB; reference frequency: 1,000 Hz; test voltage

10 V rms (1-3).

Insertion loss:  1.5 dB maximum, with 173 V, input at 1,000 Hz across (1-3). Resonance:  Second resonant frequency = 20,000 Hz, minimum.

Polarity:  Additive, with terminals 3 and 4, and 5 and 6 connected.

Temperature rise:  20°C maximum, above an ambient temperature of 85°C, with rated power at 300 Hz. Vibration, high frequency:  MIL-STD-202, method 204, test condition B.

Shock (specified pulse):  MIL-STD-202, method 213, test condition I. Part or Identification Number (PIN):   M27/11-01*.

* = See table I for mounting type.

TABLE I.  Cross reference.

NOTE:  Qualification approval to MIL-T-27/11 shall be sufficient to grant qualification approval to MIL-T-27/3 through

MIL-T-27/10.

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