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7-6
IM 701210-05E
Explanation
Selecting the Acquisition Mode
You can select any of the acquisition modes below. The default setting is Normal.
• Normal Mode
Sampled data are stored in the acquisition memory without special processing.
• Envelope Mode
The maximum and minimum values are determined every acquisition interval from the
data sampled at 10 MS/s. The maximum and minimum values are stored to the
acquisition memory and an envelope waveform is displayed.
• Average 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. You are
required to set the attenuation (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.
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: nth averaged value
Xn: nth measured value
N: Attenuation (2 to 256, 2
n
steps)
Xn: nth measured value
N: Average count
(acquisition count, 2
n
steps)
You cannot use averaging mode when the trigger mode is Single, Single (N), or Log.
In addition, you cannot use averaging mode when the dual capture function is used or
when realtime recording is in progress.
For details on the roll mode, see appendix 1, “Relationship between the Time Axis
Setting, Sample Rate and Record Length.”
• Box Average Mode
For details, see section 7.4, “Acquiring Data Using Box Average.”
Note
For the procedure of switching the acquisition mode in Chart Recorder mode on the DL750P,
see section 9.3.
Acquisition Count
Set the acquisition count in the following range. If you set the value to Infinite,
acquisition will continue until you press the START/STOP key. The default setting is
Infinite. You cannot change the acquisition count during measurement. The new value
is activated when the measurement is stopped.
Normal, Envelope, and Box Average: 2 to 65536 (in 1 step) and Infinite
Average: 2 to 65536 (in 2
n
steps) and Infinite
7.3 Setting the Acquisition Mode