I
-
Calibrating for Increased Measurement
Accuracy
Choose an Appropriate Calibration Method
To
Perform
a
Conversion
Loss
Calibration
Conversion loss measurements typically utilize only a normalization
calibration. See “lb Perform a Normalization Calibration” earlier in this
chapter.
When in conversion loss measurement mode, the analyzer is using its internal
broadband detectors and pressing the (CAL) key calls up a menu for zeroing
the detectors. Zeroing the detectors helps compensate for drift due to changes
in ambient temperature. The two (CAL) selections for conversion loss mode
are:
Autozero
periodically compensates for detector drift due to changes in
temperature. When
autozero
is selected, the detectors are automatically
zeroed approximately every five minutes. A pop-up message will briefly
appear on the analyzer’s display when the detectors are zeroed.
In manual zero mode, the analyzer zeros the detectors only when the
?f&mM
Zero
softkey
is pressed.
I
NOTE
When zeroing the detectors, the analyzer turns off the internal RF source. If you are measuring an
external source with the broadband detectors, use
M&~~val,
Z&v
be/ure
the external source is
connected to the TRANSMISSION port.
6-15
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