Service manual

Agilent 382A Operating and Service Manual 11
Operation
Residual Attenuation This test measures the minimum loss introduced into a system by the use of
the 382A variable attenuator under test. Using the setup of Figure 3 proceed
as follows:
Figure 3 Residual Attenuation Setup
1. Remove the test 382A from the setup and connect together.
2. With sweep oscillator set for single frequency operation at one end of
the Model 382A band adjust variable attenuator to obtain SWR Meter
reading of 3 dB on any convenient range. Sweep 382A frequency range
and make X-Y plot. This plot represents 1 dB insertion loss (residual
attenuation).
3. At frequency used in step 2 and without changing SWR meter range,
adjust variable attenuator to obtain SWR meter reading of 2 dB. Sweep
and make X-Y plot. This plot represents zero insertion loss (residual
attenuation).
4. Without changing variable attenuator setting from step 3 insert Model
382A under test. Set 382A under test to 0 attenuation. Sweep and make
X-Y plot. This X-Y plot should be between the calibration plots.