7-4
IM 701240-01E
Explanation
Acquisition Mode
The acquisition modes below are available. The default setting is Normal.
• Normal Mode
Sampled data is 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
a value from 2 to 65536)
N
n = 1
Σ
X
n
An
Xn
N
: n
th
averaged value
: n
th
measured value
: Attenuation (2 to 256, 2
n
steps)
Xn
N
: n
th
measured value
: 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 realtime recording is in progress.
• Box Average Mode
For details, see section 7.3.
Note
For the procedure to switch the acquisition mode in Chart Recorder mode, see section 9.2.
Acquisition Count
Set the values in the range indicated below. If you set the value to Infinite, acquisition will
continue until you press START/STOP. The default value 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
7.2 Setting the Acquisition Mode