
6-22
ES User’s Guide
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 6-14
,
and
“Measuring Conversion Loss” on page 3-61
.
When in conversion loss measurement mode, the analyzer is using its
internal broadband detectors and pressing the
key calls up a
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 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
softkey is pressed.
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
before the external source is connected to
the analyzer’s input port.
CAL
CAL
Autozero
Manual Zero
Manual Zero
Manual Zero
Summary of Contents for HP 8712ES
Page 8: ...viii ES User s Guide ...
Page 17: ...ES User s Guide 1 1 1 Installing the Analyzer ...
Page 34: ...1 18 ES User s Guide Installing the Analyzer Preventive Maintenance ...
Page 35: ...ES User s Guide 2 1 2 Getting Started ...
Page 52: ...2 18 ES User s Guide Getting Started Performing the Operator s Check ...
Page 53: ...ES User s Guide 3 1 3 Making Measurements ...
Page 135: ...ES User s Guide 4 1 4 Using Instrument Functions ...
Page 159: ...ES User s Guide 4 25 Using Instrument Functions Using Markers Figure 4 15 Delta Marker Mode ...
Page 165: ...ES User s Guide 4 31 Using Instrument Functions Using Limit Testing Figure 4 16 Limit Lines ...
Page 224: ...4 90 ES User s Guide Using Instrument Functions Using an External VGA Monitor ...
Page 225: ...ES User s Guide 5 1 5 Optimizing Measurements ...
Page 246: ...5 22 ES User s Guide Optimizing Measurements Measuring Devices with Long Electrical Delay ...
Page 247: ...ES User s Guide 6 1 6 Calibrating for Increased Measurement Accuracy ...
Page 281: ...ES User s Guide 7 1 7 Front Rear Panel ...
Page 306: ...7 26 ES User s Guide Front Rear Panel Line Module ...
Page 307: ...ES User s Guide 8 1 8 Hardkey Softkey Reference ...
Page 410: ...8 104 ES User s Guide Hardkey Softkey Reference Z ...
Page 411: ...ES User s Guide 9 1 9 Specifications ...
Page 469: ...ES User s Guide 10 1 10 Safety and Regulatory Information ...
Page 475: ...ES User s Guide 10 7 Safety and Regulatory Information Regulatory Information ...
Page 476: ...10 8 ES User s Guide Safety and Regulatory Information Regulatory Information ...
Page 477: ...ES User s Guide 11 1 11 Factory Preset State and Memory Allocation ...