
6-12
ES User’s Guide
Calibrating for Increased Measurement Accuracy
Calibration Choices
Retrieving Previous User-Defined
Calibrations
User-defined calibrations that you have already performed may be
available for you to use again. In some cases, you can retrieve these
calibrations rather than perform new ones. The following user-defined
calibrations, if previously performed (and not cancelled by manually
selecting a default calibration of the same type), may be retrieved when
current instrument settings are compatible:
• user two-port (for all S-parameter measurements)
• user one-port (for S
11
and S
22
measurements)
• user response (for S
21
and S
12
measurements)
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.
User-defined calibrations are always cancelled when you manually select
a default calibration of the same type. The following example illustrates
this point:
A user one-port calibration (for S
11
and S
22
) is cancelled by manually
selecting
. Note, however, that user response
calibrations (for S
21
and S
12
) and a two-port calibration (for all
S-parameters) are unaffected by this change.
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 6-33
instrument’s power is cycled, the current instrument state and
calibration will be retrieved.
Default 1-Port
SAVE RECALL
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 ...