
ET User’s Guide
4-39
Using Instrument Functions
Using Limit Testing
Additional Notes on Limit Testing
Stimulus and
Amplitude Values
In frequency sweep mode, the stimulus values are interpreted as
frequencies; in power sweep mode, the stimulus values are interpreted
as output power levels.
CAUTION
The values entered for stimulus and amplitude are unitless. If the
measurement format is changed after limit lines are set, the amplitude
values do not automatically change. Therefore, you should select the
format you want to use before entering your limits.
Calculating the
Frequency of a
Data Point
The frequency of each data point is calculated using the following
formula:
where pt number ranges from 1 (for the leftmost display point) to
number of points (the rightmost display point).
Limit Testing and
Measurement
Points
Limit testing is only performed on actual data points, not interpolated
values between them. The limit lines or points that you enter are
converted to values at each measurement point. Most of the time this has
little or no effect on the validity of the limit testing. However, note the
following examples of problems that could arise when using limit lines:
Freq
pt number
(
)
pt number
1
–
(
)
stop freq
start freq
–
×
number of points
1
–
-----------------------------------------------------------------------------------------------------------------------------
start freq
+
=
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 ...