
ES User’s Guide
5-13
Optimizing Measurements
Reducing Trace Noise
To Eliminate Receiver Spurious Responses
Spurious responses are undesirable signals that result from various
internal mixing products.
The analyzer has two features to eliminate spurious responses. Both
features shift the frequency of the spur without changing the RF output
frequency. They shift the spur by changing frequencies internal to the
analyzer that mix to produce the RF frequency. The features are:
• dither
• spur avoid
Dither is usually most effective for narrow frequency span
measurements (generally <15 MHz), as explained in the following
paragraph. If dither does not eliminate visible spurs, use spur avoid
instead.
Dithering to Shift
Spurs
Dither shifts all spurs by a small amount once, thus it imposes no sweep
time penalty. But some spurs occurring within the measured frequency
band may not be shifted out of band, and others may be shifted in.
Therefore, dither is most effective for narrowband measurements with a
user-defined measurement calibration. To activate dithering:
1.
Press
.
2. Make a user-defined measurement calibration. Refer to
“Calibrating for Increased Measurement Accuracy,”
for calibration
procedures.
CAUTION
The measurement calibration must be performed with the same spur
avoid option used in the measurement or your results may be invalid.
MENU
Spur Avoid Options Dither
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 ...