5-2
IM DL850E-01EN
Acquisition Mode (Acquisition Mode)
You can set the acquisition mode to one of the options below.
Normal Mode (Normal)
Displays waveforms without processing the sampled data.
Envelope Mode (Envelope)
The DL850E/DL850EV determines the maximum and minimum values among the data sampled at the maximum
sample rate for each module at a time interval that is twice the sampling period (the inverse of the sample rate)
of Normal mode, saves the values as pairs in the acquisition memory, and uses the saved value pairs to display
the waveforms. This mode is effective when you want to avoid aliasing, because the sample rate is essentially
kept high regardless of the time axis setting. It is also effective when you want to detect glitches (narrow pulse
signals) or when you want to display the envelope of a modulated signal.
Envelope mode
Normal mode
When the dual capture feature is used, captured waveforms cannot be displayed as envelope waveforms.
Box Average Mode (BoxAverage)
This mode can be used with the 701250 (HS10M12), 701255 (NONISO_10M12), and 720210 (HS100M12). The
DL850E/DL850EV determines the moving averages of the data sampled at the maximum sample rate, saves
them to the acquisition memory, and uses them to display waveforms. This mode is useful for removing small
levels of noise from the input signal. It is also useful for removing the noise from a single-shot signal.
Voltage
Time
Voltage
Time
1
2
20
a
21
Input signal
Box
averaged
data
b
36
• • • •
• • • •
• • •
•
The number of data points that are averaged varies as indicated below depending on the sample rate.
Sample Rate (S/s)
Number of Data Points
100 M
*
1 point
50 M
2 points
20 M
4 points out of 5
10 M
8 points out of 10
5 M
16 points out of 20
2 M
32 points out of 50
1 M
64 points out of 100
500 k
128 points out of 200
200 k
256 points out of 500
100 k or less
256 points out of the number of points equivalent to (100 M ÷ sample rate)
* The same as Normal mode
5 Waveform Acquisition
