4.3 Acquiring Waveforms Using the Utility Functions
107
4
Chapte
r 4
Me
asuremen
t Co
nfiguration Sett
ings
Description
When Averaging is enabled:
• The Roll Mode (p. 102) and Averaging cannot be used simultaneously.
Enabling the Roll Mode (by selecting [ON] or [AUTO]) automatically turns
Averaging off. Also, enabling Averaging (or the Overlay function) automati-
cally turns the Roll Mode off.
• Maximum recording length is one fourth the non-averaging length.
• Logic waveforms cannot be displayed.
• Averaging is not available when using the Model 8958 16-Ch Scanner Unit.
• Averaging and Timebase 2 (Sampling 2) cannot be used simultaneously.
When using the Memory Division function:
• Averaging cannot be enabled.
• Trigger Priority and Stop Triggering are not available.
About Averaging
Calculations
Simple Averaging
Waveform samples are sequentially summed until the
N
th measurement is com-
pleted, at which time the sum is divided by
N
to obtain the average value.
Exponential Averaging
The specified weighting (attenuation constant
k
) is applied to the most recent
data, and the average value is obtained by applying less weighting to earlier
measurement data as the number of measurements is summed.
A
1
N
----
X
i
i
1
=
N
=
A
: Averaging value,
X
i
: Value measured at time i,
N
: Number of samples to average
A
1
X
1
=
A
1
: Average value after first measurement,
X
1
: Value of the first measurement
A
n
1
k
--- k
1
–
A
n
1
–
X
n
+
=
n
: No. of waveform samples (2 to N),
k
: Attenuation constant
A
n
: Average of n samples,
X
n
: Value of the n
th
waveform sample
Содержание 8860-50
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Страница 12: ...Contents x...
Страница 18: ...Reading this Manual 6...
Страница 24: ...1 3 Interconnection and Block Diagrams 12...
Страница 180: ...6 12 Making Trigger Settings on the Waveform Screen 168...
Страница 246: ...8 15 Inserting and Searching for Event Marks on a Waveform 234...
Страница 354: ...12 7 Print Examples 342 Print Example 4 Row Printing 1 4 steps Settings data Each step is 25 div...
Страница 356: ...12 7 Print Examples 344 A B Waveform_________________________________________________...
Страница 360: ...12 7 Print Examples 348 Event ________________________________________________________ Event mark...
Страница 406: ...14 2 External I O 394...
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