10-7
IM DL350-01EN
Statistical Processing (Statistics)
Turning Statistical Processing On and Off
• ON: Statistical processing is enabled.
• OFF: Statistical processing is disabled.
Statistical Processing Type (Type)
The following types of statistical processing are available.
•
Continuous statistical processing (Continuous Statistics)
: Continuous statistical processing is performed.
•
Cyclic statistical processing (Cycle Statistics)
: Statistical processing is performed for each period (cyclic
statistical processing).
•
Statistical processing of history waveforms (History Statistics)
: Statistical processing is performed on history
waveforms.
Continuous Statistical Processing (Continuous Statistics)
While acquiring waveforms, the instrument calculates the statistics of the waveforms that it has acquired so far. If
you stop waveform acquisition and then restart it, the instrument will continue statistical processing and include
the data from before waveform acquisition was stopped. The instrument 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 instrument is acquiring
waveforms.
Measurement Item
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 instrument can display the statistical results of four automatically measured items. If five or more
automatically measured items are selected, the instrument 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.
10 Automated Measurement of Waveform Parameters
