Keysight Technologies X Series Service Manual page 38

Overview
Service Equipment You Will Need
g. 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 recommended 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.
38 Keysight N9010A EXA Service Guide