MIL-DTL-24215D
4.7 Methods of examination or test.
4.7.1 Visual and mechanical examination. Attenuators shall be examined to verify that the material,
design, construction, physical dimensions, finish, marking, and workmanship are in accordance with the
4.7.2 Electrical tests for attenuators (3.5).
4.7.2.1 Electrical tests for attenuators with attenuation values of 60 dB or less. The attenuators shall
be tested for electrical requirements using the applicable measuring system shown on figure 1 or figure2.
The attenuator may be tested for electrical requirements using swept frequency techniques and a network
analyzer. The attenuation measurement system shall have an accuracy of 0.1 dB per 10 dB or better.
Frequency shall be monitored to within ± 0.1 percent for compliance with the frequency range
requirement. Unless definite frequencies are specified, the minimum number of measurements shall be
at midband and both extremes of the frequency range. With the frequency and power level appropriately
adjusted, the attenuator, set at the minimum attenuation position, shall be inserted into the measurement
line and the insertion loss and VSWR measured. Calibration of the dial shall then be checked, or the
maximum attenuation measured, whichever is applicable. These measurements shall be repeated at the
required frequencies. Calibration of the dial shall be checked, at least at one frequency, starting at the
maximum attenuation position for compliance with the backlash requirement. When applicable, non-dial
type of attenuators shall be checked for attenuation at both ends of the attenuator, at minimum, 50
percent, and maximum attenuation. VSWR shall be measured at both ends of the attenuator, at
4.7.2.2 Electrical tests for attenuators with attenuation values greater than 60 dB. The attenuators
shall be tested for electrical requirements using the measuring system shown on figure 1, or equivalent.
Measurements shall be made continuously over the entire specified frequency range. The attenuation
measurement system shall have an accuracy of 0.1 dB per 10 dB or better. Frequency shall be
monitored to within ± 0.1 percent for compliance with the frequency range requirement. With the
frequency and power level appropriately adjusted, the attenuator, set at the minimum attenuation position,
shall be inserted into the measurement line and the insertion loss and VSWR measured. Calibration of
the dial shall then be checked, or the maximum attenuation measured, whichever is applicable. These
measurements shall be repeated at the required frequencies across the frequency range. Calibration of
the dial shall be checked, at least at one frequency, starting at the maximum attenuation position for
compliance with the backlash requirement. When applicable, non-dial type of attenuators shall be
checked for attenuation at both ends of the attenuator, at minimum, 50 percent, and maximum
attenuation. VSWR shall be measured at both ends of the attenuator, at minimum, 50 percent, and
calibration and VSWR shall be checked with the specified maximum power applied to the attenuator. The
frequency shall be adjusted to the high end of the frequency range (see 3.1).
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