
ET User’s Guide
6-15
Calibrating for Increased Measurement Accuracy
Calibration Choices
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
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 TRANSMISSION port.
CAL
CAL
Autozero
Manual Zero
Manual Zero
Manual Zero
Summary of Contents for HP 8712ET
Page 8: ...viii ET User s Guide ...
Page 17: ...ET User s Guide 1 1 1 Installing the Analyzer ...
Page 34: ...1 18 ET User s Guide Installing the Analyzer Preventive Maintenance ...
Page 35: ...ET User s Guide 2 1 2 Getting Started ...
Page 52: ...2 18 ET User s Guide Getting Started Performing the Operator s Check ...
Page 53: ...ET User s Guide 3 1 3 Making Measurements ...
Page 118: ...3 66 ET User s Guide Making Measurements Measuring Impedance Magnitude ...
Page 119: ...ET User s Guide 4 1 4 Using Instrument Functions ...
Page 143: ...ET User s Guide 4 25 Using Instrument Functions Using Markers Figure 4 15 Delta Marker Mode ...
Page 149: ...ET User s Guide 4 31 Using Instrument Functions Using Limit Testing Figure 4 16 Limit Lines ...
Page 207: ...ET User s Guide 5 1 5 Optimizing Measurements ...
Page 226: ...5 20 ET User s Guide Optimizing Measurements Measuring Devices with Long Electrical Delay ...
Page 227: ...ET User s Guide 6 1 6 Calibrating for Increased Measurement Accuracy ...
Page 266: ...6 40 ET User s Guide Calibrating for Increased Measurement Accuracy Checking the Calibration ...
Page 267: ...ET User s Guide 7 1 7 Front Rear Panel ...
Page 292: ...7 26 ET User s Guide Front Rear Panel Line Module ...
Page 293: ...ET User s Guide 8 1 8 Hardkey Softkey Reference ...
Page 395: ...ET User s Guide 9 1 9 Specifications ...
Page 397: ...ET User s Guide 9 3 Specifications System Performance ...
Page 443: ...ET User s Guide 10 1 10 Safety and Regulatory Information ...
Page 449: ...ET User s Guide 10 7 Safety and Regulatory Information Regulatory Information ...
Page 450: ...10 8 ET User s Guide Safety and Regulatory Information Regulatory Information ...
Page 451: ...ET User s Guide 11 1 11 Factory Preset State and Memory Allocation ...