HP 85097A User Manual page 96

Recertifying ECal Kits
Recertification
How Hewlett-Packard Verifies Kit Devices
Hewlett-Packard verifies the specifications of these devices as follows:
1. Residual microwave error terms of the test system are verified using
precision airlines and shorts, or low frequency resistance.
The low-frequency resistance is traceable to the United States
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 a very accurate electrical
representation.
The mechanical measurements are traceable to NIST through
various plug and ring gauges, and other mechanical measurements.
2. Each calibration device is electrically tested on this system to the
specifications listed in the "Specifications" section of the Electronic
Calibration Module Reference Guide.
The previous two steps establish a traceable link to NIST for
Hewlett-Packard to the extent allowed by the Institute's calibration
facility. The devices in this kit are traceable to NIST through
Hewlett-Packard.
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