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

NOTE
Calibrating for Increased Measurement Accuracy
Calibration Choices
Reflection Calibration Interpolation
Widening the frequency span after performing the user one-port or user
two-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 performed a calibration, 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" on page
and "Measuring Conversion Loss" on page
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 analyzer's input port.
6-22
3-61.
CAL
before the external source is connected to
6-14,
key calls up a
CAL
ES User's Guide