TB 9-4931-523-35
a. Refer to TI as
listed in
appendix and
evaluate TI
for connector type, impedance, and
frequency range. Determine and record at least 10 equally spaced frequency test points.
NOTE
The calibration frequencies attached to TI or test report
furnished with TI may be used if desired.
b. Refer to TI
type and
frequency range for equipment setup figure and
performance
paragraph as listed in (1) through (6) below:
(1) Fixed attenuator with frequency range between 10 MHz and 18 GHz refer to c
below.
(2) Variable attenuator with frequency range between 10 MHz and 18 GHz, refer to
d below.
(3) Fixed attenuator with frequency range between 18 and 26.5 GHz, refer to e
below.
(4) Variable attenuator with frequency range between 18 and 26.5 GHz, refer to f
below.
(5) Fixed attenuator with frequency range between 26.5 and 40 GHz, refer to g
below.
(6) Variable attenuator with frequency range between 26.5 and 40 GHz, refer to h
below.
NOTE
For maximum accuracy, the RF input level to channel I
should be approximately -60 dBm, and the RF input level
to channel II should be approximately -30 dBm or less.
NOTE
The insertion loss measurements for attenuators listed in the
appendix are considered adequate for determining their
accuracy and serviceability. VSWR checks are not required.
NOTE
Unless otherwise specified, verify the results of each test and,
whenever the test requirement is not met, take corrective
NOTE
When calibrating waveguide attenuators, use four clamps or
screws for each connection to reduce losses.
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