TB 9-4931-523-35
Paragraph
Page
Fixed attenuation measurement
(26.5 to 40 GHz) ......................................................
Variable attenuation measurement
(26.5 to 40 GHz) ......................................................
Final procedure.......................................................
Test instrument identification...............................
(10 MHz to 18 GHz)................................................
(10 MHz to 18 GHz)................................................
IDENTIFICATION AND DESCRIPTION
1. Test Instrument
Identification. This procedure provides instructions for the
calibration of Attenuators, Fixed and Variable (10 MHz to 40 GHz) (General). The
manufacturers' manuals were used as the prime data sources in compiling these
instructions. The equipment being calibrated will be referred to as the TI (test instrument)
throughout this bulletin.
a. Model Variations.
Variations among models are described in
appendix A.
b. Time and Technique. The time required for this calibration is approximately 2
hours for fixed and variable attenuators from 10 MHz to 18 GHz, and 5 hours for fixed and
variable attenuators from 18 to 40 GHz.
2. Forms,
Records, and
Reports. Forms, records, and
reports required for calibration
personnel at all levels are prescribed by TB 750-25.
3. Calibration
Description. TI
parameters and
performance specifications that
pertain
to this calibration are listed in appendix A. TIs other than those listed in the appendix may
be checked using the techniques in this TB if the manufacturers' specifications are
available.
EQUIPMENT REQUIREMENTS
4. Equipment
Required. Table 1
identifies the
specific equipment to be
used in this
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Set AN/GSM-287, AN/GSM-705 and Secondary Reference Calibration Standards
Set NSN 4931-00-621-7878. Alternate items may be used by the calibrating activity. The
items selected must be verified to perform satisfactorily prior to use and must bear evidence
of current calibration. The equipment must meet or exceed the minimum use specifications
listed in table 1. The accuracies listed in table 1 provide a four-to-one ratio between the
standard and TI. Appendix A is footnoted where the four-to-one ratio may not be met.