Service manual

Agilent 382A Operating and Service Manual 1
Overview
The Agilent Technologies 382A variable precision attenuators are designed
for use in waveguide systems operating in the 3.95 to 40.0 GHz range. Each
model of the 382A series provides calibrated attenuation from zero to 50 dB
at any frequency within the rated waveguide band.
Attenuation is read directly on the dial. Residual attenuation (at zero setting)
is less than 1 dB over the waveguide range. Backlash is less than 0.3 dB at
50 dB. The SWR is low and variation of phase with setting is practically
negligible.
Initial Inspection
Mechanical Check If damage to the shipping carton is evident, ask that the carrier's agent be
present when the instrument is unpacked. Inspect the instrument for
mechanical damage such as scratches, dents or broken knobs. Also check the
cushioning material for signs of severe stress (compacting).
Performance Check The electrical performance of the 382A should be verified as soon as
possible after receipt. A performance check suitable for incoming inspection
is provided in “Performance Test” on page7.
Claim For Damage If the 382A is mechanically damaged or fails to meet specifications on
receipt, notify the carrier and the nearest Agilent Technologies office
immediately. (Refer to “Service and Support” on pagev.) Retain the
shipping carton and the padding material for the carrier’s inspection.
Handling
Care of Flanges Take care to prevent damage to the face of the coupling flanges. Any scoring
of the mating surfaces tends to increase the separation of the flange faces and
will cause increased leakage and loss, particularly where a current maximum
and voltage minimum occur at the flange. When storing the 382A, be sure to
replace the flange covers to preclude damage to the flanges.
Avoid Vertical Shock When shipping or handling these attenuators in a manner in which will
subject it to shocks in a vertical plane, always set the attenuation dial to zero.
With the dial at zero, danger is minimized that vertical shocks will cause the
attenuator flag to move downward, releasing tension on the drive cable.