
6-10
ET User’s Guide
Calibrating for Increased Measurement Accuracy
Calibration Choices
Retrieving Previous User-Defined
Calibrations
User-defined calibrations that you have already performed are available
for you to use again. In some cases, you can retrieve these calibrations
rather than perform new ones. Previous user-defined calibrations can be
retrieved as long as the following two conditions are met: 1) current
instrument settings are compatible with the calibration, and 2) you have
not cancelled the user-defined calibration by manually selecting a default
calibration of the same type. (Example: a user-defined one-port reflection
calibration is cancelled by manually selecting
.)
Widening the frequency span after retrieving a user-defined calibration
will invalidate it, and the analyzer will automatically restore the default
calibration of the same type. The user-defined calibration will
automatically be retrieved again when you narrow the instrument’s
frequency span to be compatible with that of the calibration.
Note that after you have retrieved a calibration, a "C" appears in the
upper right hand corner of the display. This "C" indicates that a
user-defined cal 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.
Current user-defined calibrations are always available in nonvolatile
(battery-backed) memory. Subsequent calibrations of the same type will
cancel the previous calibration unless it is saved using
.
See
“Saving and Recalling the Calibration” on page 6-26
instrument’s power is cycled, the current instrument state and
calibration will be retrieved.
Presetting the Analyzer: How Calibration Is
Affected
When the instrument is preset, the current user-defined calibration will
be retained if the instrument’s preset settings match those of the
calibration. If settings do not match, a default calibration will be
automatically restored. The user-defined calibration will automatically
be retrieved when you adjust the instrument settings to be compatible
with those of the calibration.
Default 1-Port
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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 ...