
ET 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 (analyzer RF OUT) side of the
DUT; load match errors on the load (analyzer RF IN) 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 reflection calibration directly at the point
that will connect to the DUT, using the exact frequency parameters that
you will be using for the measurement. 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 reflection measurement and frequency parameters.
2. Press
.
3. Follow the instructions on the display.
See
for more information on calibration choices for reflection
measurements.
CAL
1-Port
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 ...