
ES User’s Guide
5-15
Optimizing Measurements
Reducing Mismatch Errors
Reducing Mismatch Errors
Mismatch errors are due to the fact that the analyzer’s port impedances
are not exactly 50 ohms or 75 ohms across the frequency range. Source
match errors are produced on the source side of the DUT; load match
errors on the load side. If the DUT is not connected directly to the port,
the mismatch errors due to cables, adapters, etc. are considered part of
the source or load match errors. Source match and load match error
terms can be reduced by using the methods described in this section.
Reducing Mismatch Errors in a Reflection
Measurement
The best way to reduce mismatch errors in a reflection measurement of a
two-port device is to perform a two-port calibration directly at the point
that will connect to the DUT, using the exact frequency parameters that
you will be using for the measurement. Though not quite as accurate as a
two-port calibration, a one-port calibration can also be used to reduce
mismatch errors. A one-port calibration offers the advantage of faster
measurement speeds than when using a two-port calibration. The
accuracy of a one-port calibration for a two-port device can be increased
dramatically by terminating the output port of the device with a high
quality Z
0
termination (a load from a calibration kit, for example)
instead of connecting it to the analyzer.
1. Set up your S
11
port 1 reflection measurement or S
22
port 2 reflection
measurement, and frequency parameters.
2. Press
or
.
3. Follow the instructions on the display.
See
for more information on calibration choices for reflection
measurements.
CAL
User 2-Port
User 1-Port
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 ...