Keysight Technologies N9040B UXA Signal Analyzer Service Guide 35
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. This characterization can be
ordered through Keysight Technologies as an Option H50 Calibration.
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
Recommended Uncertainty for each attenuator setting. A larger number will
result in larger overall test uncertainties which could affect the test pass/fail
rate.
The interconnect cable should NEVER be disconnected once the loss
characterization is performed.
Guidelines for Ordering Power-Sensor Calibration Service
Use the following guidelines to ensure power sensors used by the N7842A
application receive the correct calibration service:
1. Order Option 1A7 when ordering new power sensors that will be used as
working standards in N7800A TME calibrations.
2. In the Americas region, order the Keysight Cal + Measurement Uncertainty
for power sensor recalibration.
3. Outside the Americas region, order ISO 17025/ILAC-G8 calibration service
for power sensor recalibration.
g. When using the 10 MHz External Reference, be sure to update the Additional Properties in TME to the
correct Frequency Accuracy in parts per million (ppm). For example, if overall accuracy is 9e-12, the
equivalent is 9e-6 ppm. Refer to the Additional Properties section in the N7800A TME Help for instruc-
tions.
h. The step attenuators should be permanently joined via the 11716A Interconnect Kit as shown in the
diagram.
i. 8491A Option H33 is a fixed attenuator which has been characterized to have a VSWR ≤ 1.05:1 at 50
MHz. A VSWR of 1.05:1 is critical to test Input Attenuator Switching Uncertainty, Display Scale Fidelity,
and Absolute Amplitude Accuracy performance tests. Any 8491A/B attenuator can be mapped into this
device if the VSWR at 50 MHz has been characterized to be ≤ 1.05:1. When mapping the attenuator, to
indicate that is meets the required specification, the Option H33 checkbox will need to be checked in
the configure test station Administration screen.
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