JJG 322-1983 Replaced National Metrology and Inspection Regulations JJG

JJG 322-1983 Rotory Vane Attenuator

Publish Date: 1983-10-26 Implement Date: 1984-10-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

Basic Information

Standard Code: JJG 322-1983

Standard Type: National standards

Standard Status: Replaced

is_force_gb: no

CCS Name: -

ICS Name: -

Publish Date: 1983-10-26

Implement Date: 1984-10-01

Publisher: National Metrology Bureau

Technical Committee: Chinese Academy of Metrology

Pages: 17 pages

Scope

This procedure is applicable to the verification of all types of rotary attenuators with an accuracy of ± (0.02~0.05) dB/10 dB that are newly manufactured, in use, or repaired.
Rotary attenuators have the advantages of a small initial attenuation, high accuracy, good frequency response, low phase shift, high resolution, and good stability. They are a widely used precision attenuator in the microwave band and are often used as a standard to calibrate lower-level attenuation standard devices and working attenuators.
Rotary attenuators consist of three sections of waveguides connected in series. The two ends are fixed rectangular-circular transition waveguides, and the middle section is a circular waveguide that can rotate around its longitudinal axis. Resistive attenuation plates are installed on the central plane of the two rectangular-circular transition waveguides, which are parallel to the wide sides of the rectangular waveguide. Attenuation plates are also installed on the diameter plane of the middle circular waveguide. In the initial position, they are on the same plane as the fixed attenuation plates at the two ends.