Keysight Technologies 85055A, User'S And Service Manual

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4-1
Keysight Tecnologies 85055A
Type-N 50
Ω Veification Kit
User’s and Service Guide
4 Performance Verification
Introduction
The performance of your verification kit can only be verified by returning the kit
to Keysight Technologies for recertification. The equipment required to verify
the specifications of the devices in the kit has been specially manufactured and
is not commercially available.
How Keysight Verifies the Devices in Your Kit
Keysight verifies the specifications of these devices as follows:
1. The residual microwave error terms of the test system are verified with
precision airlines and shorts that are directly traced to the National
Institute of Standards and Technology (NIST). The airline and short
characteristics are developed from mechanical measurements. The
mechanical measurements and material properties are carefully modeled
to give very accurate electrical representation. The mechanical
measurements are then traced to NIST through various plug and ring
gages and other mechanical measurements.
2. Each device is electrically tested on this system. For the initial (before
sale) testing of the devices, Keysight includes the test measurement
uncertainty as a guardband to guarantee each device meets the published
specification. For recertifications (after sale), no guardband is used and
the measured data is compared directly with the specification to
determine the pass or fail status. The measurement uncertainty for each
device is, however, recorded in the calibration report that accompanies
recertified kits.
These two steps establish a traceable link to NIST for Keysight to the extent
allowed by the institute’s calibration facility. The specifications data provided
for the devices in the kit is traceable to NIST through Keysight Technologies.