Agilent Technologies 8495D, Руководство по эксплуатации и обслуживанию

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2 8495D/K Attenuators Operating And Service Manual
Description
Description
The Agilent 8495D and 8495K are 50-ohm, dc to 26.5 GHz, 0-70 dB (in
10 dB steps), coaxial attenuators with APC 3.5 connectors. Each attenuator
is made up of four attenuation sections connected in cascade. Each section
consists of a precision thin-film attenuator card, a lossless thru-line, and a
ganged pair of edge line transmission lines. The edge lines are flexed to
make contact with either the attenuator card or the thru-line. The edge line
contacts are gold-plated leaf springs which ensure long life and high
repeatability. In the 8495D, the edge line controls are flexed by low-torque
cams. In the 8495K, the edge line controls are flexed by solenoid plungers
(see Figure 1).
Table 1 on page 3 shows the switching arrangement required to increase the
amount of attenuation from 0 to 70 dB in 10 dB steps. In the 8495K, to
ensure specified performance, it is recommended that the attenuator sections
shown in the table below be used. Also, when changing attenuation, it is
good practice to insert the required sections before deletion of the unneeded
sections. With the attenuator set for 0 dB attenuation, only the insertion loss
(residual attenuation) remains.
Figure 1 8495K Programmable Four-Section Attenuator Schematic Diagram