Service manual

Agilent 382A Operating and Service Manual 17
Maintenance
Maintenance
No maintenance is required on the K382A or the R382A. On other models,
the only maintenance required is occasional lubrication of the bearing
surfaces. The worm and worm gear, ball bearings, gears, flag shaft, and the
ends of the center section (see Figure5 on page13) should be lubricated
with a light grease such as Lubriplate #105V.
*
Replacing The Dial Align the "0" placement on dial with "Max".
Resistive Card
Replacement Procedure
Resistive cards can be replaced quickly and easily in Agilent Technologies
X382A and P382A broadband precision waveguide variable attenuators, by
following these procedures. Models K382A and R382A, should be returned
to the factory for repair. The attenuation accuracy of the 382A is directly
dependent upon the condition of its resistive elements. These elements are
composed of precisely cut mica cards overlaid with an evaporated metal
film. Accuracy is impaired if the card becomes damaged or the metal film is
burned. The attenuating characteristics of the instrument then no longer
follow the mathematical law for the attenuator.
Replacement of the damaged cards and calibration of the attenuator will
restore the instrument to the specifications published for the unit.
Installation requires only disassembly of the end or center section (as
necessary), positioning of the replacement resistive element card,
reassembly of the unit, and calibration.
For your convenience stock numbers of replaceable parts for the 382A
variable attenuator are included according to frequency band designations
Card Replacement
Procedure
NOTE To replace only the end-section card, complete the following: steps 1, 5, and
6 of “To Dismantle” on page17, steps 1 through 10 of “End Section
Resistive Card Replacement” on page23, and steps 3, 4, 5, and 7 of
“Assembly” on page25.
To Dismantle 1. Remove dial knob and dust cover (see ).
2. Turn dial fully clockwise.
* Fiske Brothers Refining Co. Newark. New Jersey, and Toledo, Ohio.