4-16 PN: 10580-00343 Rev. H S820E UG
4-3 Calibration Procedures Calibration, CAA
Thru Update
When measuring the transmission (or insertion loss) response of a DUT, the
calibration requires a Thru measurement to be performed. This requires at
least one external cable to be introduced into the calibration. The additional
cable component is the most susceptible to changes from environmental
conditions, such as temperature changes and mechanical flexing. The Thru
Update button (see Figure 4-11 on page 4-19) allows you to quickly eliminate
the effects of temperature changes or of changes caused by mechanical flexing
of the cable without having to repeat the entire calibration process. The Thru
update is particularly useful when viewing DUT transmission responses with
small scale resolution (0.5 dB/division or less).
Figure 4-10 shows the Calibration dialog box showing calibration setup and
calibration steps. On-screen instructions are given for each step.
Figure 4-10. Calibration Dialog Box for Coax
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