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Keysight Technologies
Setting and Adjusting
Instrument Calibration Intervals




                                                                                      Application Note




Introduction
For every organization that relies on electronic test equipment, the cost of instrument
calibration is sometimes viewed as an expense that could be easily reduced. Calibration
costs--and therefore calibration intervals--are part of a broader discussion that includes
tradeoffs between risk and cost, and between quality and customer satisfaction.

Because the instrument manufacturer provides a recommended calibration interval, there
may be a feeling that this is an arbitrary time span driven by tradition or other motivations.
From Keysight Technologies perspective, a well-defined calibration interval is one that
balances the tradeoffs between the cost and inconvenience of the process and the need
to keep test instruments performing within their specifications. The right cal interval
also reduces the risks that come with inaccurate measurements and erroneous pass/fail
decisions. Ultimately, our overarching goal is to boost your confidence in two areas: in the
results our instruments produce and in the decisions you make based on those results.
Outlining our approach
Keysight Technologies, Inc. uses well-defined processes to set the initial cali-
bration interval and then assess the possibility of extending that interval. Below,
we outline the method used prior to the introduction of a new product and also
describe the process we use after a full two years of calibration data is available
for a specific model.

This information will be of interest to at least two distinct groups. One is any
organization that uses outside service providers and wants to reduce costs
without adversely affecting product quality or system performance. The other is
self-maintainers seeking guidance regarding internal management of calibration
intervals for their instrument pool. Both groups will find answers in the pages
that follow.

Setting the initial calibration interval
Prior to the introduction of a new product, the responsible R&D and quality engi-
neers set the initial recommended calibration interval. They do this by looking at
reliability data from at least three areas:
  

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