MIL-DTL-22442/41B(AS)
NOTES:
1. An oscilloscope is required to ascertain if any wave shape distortion or oscillation is
present while performing tests.
2. R1 is a variable resistor (or resistance decode box) which can be adjusted to any value
between the limits of 4000 ohms ± 20 percent. The accuracy shall be .5 percent or better.
3. Switch S1 shall be placed in the "R" position when performing the earphone impedance
test, and placed in the "G" position when performing other tests.
4. The ear simulator shall meet the requirements of ASA Standard S3.25/1979. A possible
source of supply is : Bruel and Kjaer ear simulator type 4157. The ear simulator should
consist of the following parts as a minimum: microphone, microphone preamplifier, power
supply.
FIGURE 6. Earphone test circuit.
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