MIL-DTL-83511/1A
FIGURE 3. Headset-electrical, H-251A/U, wiring diagram.
REQUIREMENTS:
Interface: Figure 1 is for illustration purposes only and all referenced drawings and specifications cover
design.
Weight: 12 ounces maximum.
Earphone: Two required (1000 Ohms each), in accordance with MIL-PRF-25670/5 Part or Identifying
Number (PIN) M25670/5-01.
Frequency response: Output shall be 104 to 110 dB between 100 to 3,500 Hz.
Frequency response range: 100 to 3,500 Hz.
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Sensitivity: 107 ±3 dB related to .0002 dynes/cm at 1 kHz.
Distortion: 5 percent maximum within the frequency response range.
Impedance: 1,000 ±100 ohms at 1,000 Hz with 1.0 volt applied across the terminals.
Endurance: ±3 dB maximum deviation from initial F/R after 8 hours with 500 milliwatts input power
(22.4 volts) at 1,000 Hz.
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