MIL-PRF-27/1F
REQUIREMENTS: (When numbers in parentheses, i.e., (1-3) are used, they indicate the winding and the
extreme terminals of the winding.)
Electrical rating:
Primary power level: 2 W at 1 kHz.
Working voltage (peak): 125 volts.
Design, configuration, and physical dimensions: See figure 1.
Material: Metal encased, steel.
Weight: 4 ounces, maximum.
Duty cycle: Continuous.
Terminal: Solder lug, number 18 AWG, standoff type.
Temperature range: See table I.
Terminal strength: Method 211 of MIL-STD-202, test condition A, 5 pounds.
Dielectric withstanding voltage: Method 301 of MIL-STD-202, test voltage, 500 V rms.
Electrical characteristics:
Harmonic distortion: Not more than 1 percent at 2 W 1 dB at 1 kHz.
Primary impedance: 4,000 400 ohms (1-3), tapped at 250 25 ohms (2-3).
Secondary load impedance: 8 1 ohms (4-5).
DC resistance (DCR):
Primary DCR: 157 ohms 25 percent.
Secondary DCR: 0.56 ohm 25 percent.
Frequency response:
Range: 250 Hz to 5,000 Hz at rated power, flat within 2 dB; reference frequency 1 kHz;
Test voltage 88.5 V rms (1-3).
Insertion loss: 0.5 dB maximum, with 2 W input at 1 kHz.
Polarity: Additive, with terminals 3 and 4 connected.
Temperature rise: See table I.
Vibration, high frequency: Method 204 of MIL-STD-202, test condition B.
Shock (specified pulse): Method 213 of MIL-STD-202. test condition H.
Part or identifying number (PIN): M27/1-(dash number from table I).
2
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