8-20 PN: 10580-00343 Rev. H S820E UG
8-6 VVM Calibration Vector Voltmeter
A/B or B/A Ratio Measurements
VVM calibration is not available when making A/B or B/A ratio
measurements. In some cases, adding a 3 dB or 6 dB attenuator to each
measurement port (A and B) may be helpful to reduce mismatch errors,
which cannot be vector error corrected. If attenuators are going to be added,
they must be installed BEFORE performing the Save Reference function.
Test port cables, adapters, fixtures, or any other items that are needed to
connect to the DUT must also be in place before performing the Save
Reference function, and must remain in place for the duration of the
measurements.
Performing Calibrations
The calibration menu choices are a subset of those found in
Chapter 4, “Calibration, CAA” with fewer choices due to the fewer types of
measurements that are available with the vector voltmeter.
To view a summary of these settings, begin from the Calibration main menu
and press Cal Info. A summary of the Active Cal Settings and the Current
Settings of the instrument are displayed (for an example, see Figure 4-3
on page 4-3). Press Esc to close the Cal Info window.
The calibration menu has a Thru Update submenu key (see Figure 8-20
on page 8-27) that allows you to recalibrate the Thru component without
repeating the entire calibration sequence. Refer to “Thru Update”
on page 4-16.
For more specific calibration information, refer to Chapter 4, “Calibration,
CAA”.
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