7-7
IM 701450-01E
7
Waveform Acquisition
Setting the Attenuation Constant (When the Acquisition Mode Is Average and
Count Is Infinite)
6. Press the Weight soft key.
7. Turn the jog shuttle to set the attenuation constant.
Explanation
You can select the acquisition mode from the following. The default setting is normal mode.
Normal Mode
Sampled data is stored in the acquisition memory without special processing.
Envelope Mode
Regardless of the interleave mode setting (ON or OFF), the maximum and minimum
values are determined every acquisition interval from the data sampled at 1 GS/s or 800
MS/s. The maximum and minimum values are stored to the acquisition memory and an
envelope waveform is displayed.
Note
This mode can be specified when the time axis would be 500 MS/s or less in normal mode
regardless of the interleave mode setting (ON or OFF). For all other cases, the mode is set to
normal mode even when envelope mode is specified.
Averaging Mode
Sampled data is averaged and stored to the acquisition memory. The averaging method
varies depending on the acquisition count setting. If the acquisition count is set to Infinite,
exponential averaging is performed and you must set the attenuation constant (Weight). If
the acquisition count is set to a value in the range of 2 to 65536, simple averaging is
performed. The specified value is the average count.
Exponential Average
Cannot be specified when the trigger mode is Single or Single (N).
Simple Average
Switches to exponential averaging when in repetitive sampling mode. The maximum record
length is 4 MW (8 MW when interleave mode is ON).
An= {(N–1)A
n–1+
X
n
}
1
N
Exponential average (when set to Infinite)
A
N=
N
Simple average (when set to 1 to 65536)
N
n=1
Σ X
n
An
Xn
N
: nth averaged value
: nth measured value
: Attenuation (2 to 256, 2
n
steps)
Xn
N
: nth measured value
: Average count
(acquisition count, 2
n
steps)
For the relationship between the time axis setting and roll mode or repetitive sampling
mode, see appendix 1.
7.5 Setting the Acquisition Mode
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