10-7
IM DL850E-01EN
Normal Statistical Processing (Statistics)
While acquiring waveforms, the DL850E/DL850EV calculates the statistics of the waveforms that it has acquired
so far. If you stop waveform acquisition and then restart it, the DL850E/DL850EV will continue statistical
processing and include the data from before waveform acquisition was stopped. The DL850E/DL850EV also
performs statistical processing for selected automatically measured items that are not displayed. The number
of measured values used to calculate statistics (Count) is equal to the number of waveforms that have been
acquired up to that point.
If you add an additional automatically measured item to apply statistical processing to, the number of measured
values used to calculate the statistics (Cnt) is reset to 1 regardless of whether the DL850E/DL850EV is acquiring
waveforms.
Measurement Items (Measure Setup)
Statistical processing is performed on the same measurement items that the automated measurement of
waveform parameters is performed on. The following five statistics are computed for the measurement items
whose measurement has been turned on. The maximum number of measurement items that can be displayed
on the screen is 3.
• Maximum: Maximum value
• Minimum: Minimum value
• Average: Average value
• SDev: Standard deviation
• Count: Number of measured values used to calculate statistics
The measurement items are the same as those for the automated measurement of waveform parameters.
If you select CH1 P-P as the automatically measured item, the number of measured values used to calculate
the maximum, minimum, mean, and standard deviation values for CH1 P-P appear at the bottom of the
screen.
The DL850E/DL850EV can display the statistical results of three automatically measured items. If four
or more automatically measured items are selected, the DL850E/DL850EV displays the first three items
ordered by ascending channel number and the order that the items appear in the Item Setup automated-
measurement-item selection menu (P-P, Amp, Max, Min, ..., Init1XY, and Init2XY).
Example 1:
When CH1: P-P, Amp; CH2: Min; CH3: Max, Min are selected, the following items are displayed: CH1: P-P;
CH2: Min; CH3:Max.
Example 2:
When CH1: Max, Min; CH2: P-P, Amp are selected, the following items are displayed: CH1: Max, Min;
CH2: P-P.
You can view the statistics of other items in the following way.
• Load the items into a PC using the communication feature.
• Save the statistical items as automated measurement values of waveform parameters, and load the data
into a PC.
• Scroll through the list of calculated statistics using the arrow keys.
Measurement Time Period (Time Range1/Time Range2)
This setting is the same as the measurement time period setting for the automated measurement of waveform
parameters.
10 Automated Measurement of Waveform Parameters