To Perform A Conversion Loss Calibration - HP 8712ET User Manual

NOTE
Reflection Calibration Interpolation
Widening the frequency span after performing the one-port calibration
will invalidate it, and restore the default calibration. You may narrow
the span and the analyzer will interpolate between calibration points for
the narrower span.
Note that after you have calibrated, a "C" appears in the upper right
hand corner of the display. This "C" indicates that a user-defined cal (not
the default) is in use. If you change to a narrower span, note that the "C"
changes to "C?", indicating the analyzer is now interpolating between
calibrated measurement points. The "C?" notation also appears when
other system parameters, such as power, number of points, or sweep
time, have changed.

To Perform a Conversion Loss Calibration

Conversion loss measurements typically utilize only a normalization
calibration. See "To Perform a Normalization Calibration"
in this chapter, and
When in conversion loss measurement mode, the analyzer is using its
internal broadband detectors and pressing the
menu for zeroing the detectors. Zeroing the detectors helps compensate
for drift due to changes in ambient temperature. The two
selections for conversion loss mode are:
Autozero
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.
Manual Zero
In manual zero mode, the analyzer zeros the detectors only when the
Manual Zero softkey is pressed.
When zeroing the detectors, the analyzer turns off the internal RF
source. If you are measuring an external source with the broadband
detectors, use Manual Zero
the TRANSMISSION port.
ET User's Guide
Calibrating for Increased Measurement Accuracy
"Measuring Conversion Loss"
before the external source is connected to
Calibration Choices
located earlier
located in Chapter
key calls up a
CAL
CAL
3.
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