Chapter 4
73
Front-Panel Key Reference
BW/Avg
default number of sweeps is 100. Increasing the number of sweeps will
smooth the trace. To turn off the video averaging function, press
Video
Average On Off
so that
Off
is underlined. The number of sweeps can be
entered using the numeric keypad. Key Access:
BW/Avg
In single sweep mode (
Sweep
,
Sweep Cont Single
(Single)), N sweeps are
taken. After each sweep, the new value of each display point is
averaged in with the previously averaged data using the following
formula:
Where:
In continuous sweep mode (
Sweep
,
Sweep Cont Single
(Cont)), the same
sequence is followed until M=N. At that point, the sweeps continue
rather than stopping. For each new sweep, the current sweeps
measured value divided by N is added to (N-1)/N times the prior
average, creating a weighted rolling average.
If any measurement parameter, such as Center Freq, Span, Amplitude,
or N, is changed while Video Average is On, the video average counter is
reset to 0, i.e. M=0, and the trace average resets. If the analyzer is in
single sweep mode, a new set of sweeps is taken only after
Sweep Cont
Single
(Single) is pressed again.
A
avg
M
1
–
M
-------------- A
prior avg
1
M
----- A
m
+
=
A
avg
new average value
=
A
prior avg
average from prior sweep
=
A
m
measured value on current sweep
=
M
number of current sweep
=
Содержание ESA-L1500A
Страница 12: ...11 1 Preparing for Use and Printing ...
Страница 28: ...27 2 Getting Started ...
Страница 44: ...Chapter 2 43 Getting Started Making a Measurement Figure 2 5 Reading the Amplitude and Frequency ...
Страница 47: ...46 Chapter2 Getting Started Analyzer Battery Information ...
Страница 48: ...47 3 Troubleshooting ...
Страница 54: ...Chapter 3 53 Troubleshooting How to Return Your Analyzer for Service Figure 3 1 ...
Страница 117: ...116 Chapter4 Front Panel Key Reference Trig ...
Страница 118: ...117 5 Menu Maps ...
Страница 119: ...118 Chapter5 Menu Maps ...
Страница 120: ...Chapter 5 119 Menu Maps ...
Страница 121: ...120 Chapter5 Menu Maps ...
Страница 122: ...Chapter 5 121 Menu Maps ...
Страница 124: ...Chapter 5 123 Menu Maps ...
Страница 125: ...124 Chapter5 Menu Maps ...
Страница 127: ...126 Chapter5 Menu Maps a Frequency is replaced with Time when the X Axis Units Freq Time selection is Time ...
Страница 128: ...Chapter 5 127 Menu Maps ...
Страница 129: ...128 Chapter5 Menu Maps ...
Страница 130: ...Chapter 5 129 Menu Maps ...
Страница 131: ...130 Chapter5 Menu Maps ...
Страница 135: ...134 Chapter5 Menu Maps ...
Страница 136: ...135 6 Options and Accessories ...
Страница 145: ...144 Chapter6 Options and Accessories Accessories ...
Страница 146: ...145 7 Specifications ...
Страница 179: ...178 Chapter7 Specifications Regulatory Information ...
Страница 180: ...179 8 Required Equipment ...
Страница 187: ...186 Chapter8 Required Equipment Test Equipment ...
Страница 308: ...307 10 Performance Verification Test Record ...
Страница 321: ...320 Chapter10 Performance Verification Test Record HP ESA L1500A Performance Verification Test Record ...