
ES User’s Guide
6-27
Calibrating for Increased Measurement Accuracy
Calibration Kits
For all four standard types, the Z
0
(characteristic impedance), Delay,
and Loss must be set. For an open, C
0
, C
1
, C
2
, and C
3
, the capacitive
model parameters, must also be set.
NOTE
When creating a user-defined calibration kit, if a standard is not defined,
the currently defined values for that standard will be retained. The best
practice is to define all of your standards and characteristics when
creating a user-defined calibration kit.
Z
0
Z
0
is usually set to the system characteristic impedance
(usually either 50 or 75 ohms).
Delay
Delay is equivalent to a uniform length of transmission
line between the standard being defined and the actual
measurement plane. For an open, short, and load, the
DELAY is entered as the one-way travel time from the
measurement plane to the standard in seconds. For a
through, the DELAY is entered as the one-way travel
time between the measurement planes in seconds.
Delay can be measured or determined from the precise
physical length of the standard, divided by the velocity
factor.
CAUTION
If two ports will be connected with a through during calibration, the
calibration kits for each of these ports must be modified using the
identical delay value for the through.
Loss
Loss is used to specify energy loss, due to skin effect,
along a one-way length of coaxial delay. The value of
loss is entered as ohms/second at 1 GHz. For many
applications, the loss value can be set to zero without
noticeable degradation. To compute the loss of your
device, measure the delay in seconds and the loss in dB
at 1 GHz. Then, compute:
Loss
Ω
s
----
loss (dB)
Z
0
Ω
( )
×
4.3429 dB
(
)
delay s
( )
×
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=
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 ...