MIL-PRF-27/307A
REQUIREMENTS: (When numbers in parentheses, i.e., (1-2) are used, they indicate the extreme
terminals of the winding.)
Electrical ratings:
Power level: 7 mW.
Working voltage:
(1-2): 357 V maximum.
(3-4): 357 V maximum.
(6-7): 357 V maximum.
Frequency range: 300 Hz to 4,000 Hz.
Line winding current (1-2): 100 mA dc.
Line winding impedance (1-2): 600 ohms.
Four wire winding impedance (6-7): 600 ohms.
Balance winding impedance (3-4): 600 ohms.
DC resistance:
(1-2): 23 ohms +15%.
(3-4): 23 ohms +15%.
(6-7): 47 ohms +15%.
Design and construction:
Dimensions and configuration: See figure 1.
Duty cycle: Continuous.
Case: Metal encased.
Material: Steel.
Terminals: Standoff, solder type.
Height: .313 inch.
Weight: 325 grams maximum.
Operating temperature range: -55°C to +85°C.
Altitude: 10,000 feet maximum.
Terminal strength: MIL-STD-202, method 211, test condition A, 5 pounds.
Dielectric withstanding voltage: MIL-STD-202, method 301.
Test voltage: 1,000 Vrms.
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