11-6 Calibration Correction Vector Voltmeter, Option 15
11-6 PN: 10580-00289 Rev. K Vector Network Analyzer MG
11-6 Calibration Correction
Table 11-1 summarizes the meaning of the calibration correction status displays.
When you choose the Measurement Type and the Cal Port, the Vector Network Analyzer
compares these measurement settings with the current calibration. If a match is found, then
the current calibration is applied to the measured data, and the Cal info box on the display
(refer to Figure 11-4 on page 11-9) shows “CAL: ON (OK)”. If no match is found (for example,
the calibration was for S
11
, but the Cal Port is set to Port 2), then the display shows “CAL: --”.
Adjusting the setting (the Measurement Type or the Cal Port) to match the calibration
automatically applies the correction. The calibration correction can also be turned off
manually under the Calibration menu by toggling the Cal Correction soft key from On to Off.
In that case, the display shows “CAL: OFF”.
Note that “CAL: OFF” means that a calibration correction has been created, but it is not
currently being used. This is different from “CAL: --”, which means that no valid calibration
correction is available for the current setting.
Another status information display that you may see is “CAL: ON (?T)” which indicates that
the instrument temperature has deviated by more than a set amount since the time the
calibration was conducted. The calibration is most likely still valid, but a new calibration is
recommended. If you see “CAL: ON (X)” on the display, this indicates that the instrument
temperature has deviated (since the time that the calibration was conducted) by an amount
that has more than likely rendered the calibration invalid. When this occurs, a new
calibration is highly recommended before further measurements are conducted.
Only one calibration is available at one time. Performing a new calibration overwrites any
existing calibration. You can, however, store a measurement setup, which also stores the
calibration. You can therefore have multiple calibrations available (as long as the calibration
settings and conditions continue to apply).
Table 11-1. Calibration Status Display
Cal Status Description
CAL: ON (OK)
current calibration is applied to the measured data
CAL: ON (?T)
instrument temperature has deviated by more than a set amount since the
time the calibration was conducted
CAL: ON (X)
instrument temperature has deviated (since the time that the calibration was
conducted) by an amount that has probably rendered the calibration invalid
CAL: OFF
a calibration correction has been created, but is not currently being used
CAL: --
no valid calibration correction is available for the current setting
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