MIL-PRF-27/79A
REQUIREMENTS: (When numbers in parentheses, such as (1.-3) are used, they indicate the winding and the
extreme terminals of the winding.)
Electrical ratings:
Source impedance (1-3): 10k ohms ct ±10 percent.
Load impedance (5-7): 600 ohms ct.
Primary power level: 6 watts maximum (200 Hz to 10 kHz)
25 watt (60 Hz to 200 Hz)
Working voltage:
(1-3)
355 volts maximum.
(5-7)
175 volts maximum.
Design and construction:
Dimensions and configuration: See figure 1.
Duty cycle: Continuous.
Case: Encapsulated.
Material: Epoxy glass.
Terminals: Pin type, Dumet, hot tin dipped.
Weight: 2.5 ounces, maximum.
Operating temperature range: -55C to +130C.
Terminal strength: MIL-STD-202, method 211, test condition A, 2 pounds.
Dielectric withstanding voltage (at sea level): 1,000 volts rms (1-3) and 500 volts rms (5-7)
Electrical characteristics:
Harmonic distortion: Not more than ±10 percent at 6 watts, 200 Hz to 10 kHz across (5-7).
Primary impedance (1-3): 10k ohms ct ±10 percent at 1 kHz.
Secondary load impedance (5-7): 600 ohms ct.
Frequency response: 60 Hz to 10 kHz ±1 dB maximum.
DC resistance:
Primary (1-3): 700 ohms ±25 percent.
Secondary (5-7): 50 ohms ±25 percent.
No load (center tap (ct) voltage unbalance only):
With 50 volts, 60 Hz and 0 amp voltage unbalance dc applied to (1-3)
Unbalance (1-2) and (2-3): ±1 percent maximum.
Unbalance (5-6) and (6-7): ±1 percent maximum.
Polarity: Additive, with terminals 3 and 5 connected.
Temperature rise: 45°C.
2
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