Agilent Technologies E4440A, Service Manual

Page: 32 / 436

32 Chapter 1
Overview
Service Equipment You Will Need
Step Attenuator Loss Characterization
The step attenuator combination should have each attenuator setting
characterized by a metrology lab at 50 MHz. The following tables show
which sections of the 10 dB and 1 dB step attenuators are utilized for
each attenuator setting. The tables also list the Allowable Uncertainty
for each attenuator setting. The interconnect cable should NEVER be
disconnected once the loss characterization is performed.
b. Note: One PSG with Option 567, 1EA, 1E1, 007, and UNX or UNR can be used as the Microwave Source #1, RF
Source #2, and RF Source #3.
(Option 007, Analog Ramp Sweep, required for Frequency Response Adjustments)
c. Supported PSG models:
E8244A
E8254A
E8257C Option H31 or 540
E8257D
E8267C Option H31 or 544
E8267D
(One sweeper requires Option 1E1 for PSA Option 110 testing)
d. PSG requires Option UNX or UNR.
e. The 8482A power sensor uses cal factors to compensate the power sensor for frequency response errors. Cal fac-
tors are stated in percentages. The 8482A factory cal factor uncertainty ranges from 2.2% to 3.1%. The cal factor
uncertainty can be reduced to < 2.0% by using metrology grade calibration techniques. The power sensor cal fac-
tor uncertainty becomes one component of the Verification Test uncertainty analysis. Lower cal factor uncer-
tainties will translate to wider test margins.
f.
The step attenuators should be permanently joined via the 11716A Interconnect Kit as shown in the diagram.