Specifications

118 Chapter 8
Statistical Analysis of Measurement Results
Capturing the Measurement Data for Statistical Analysis
Capturing the Measurement Data for Statistical Analysis
Before performing statistical analysis, you must capture the necessary measurement data.
Setting the number of data segments to capture
To set the maximum number of the measurement data segments stored in the volatile
memory, use the following command:
• :CALC:EXAM:SIZE on page 227
The number of data segments captured per measurement cycle is Param ´ Nop.
Accordingly, when you want to capture the measurement data for Times cycles, you must
set the maximum number to Param ´ Nop ´ Times. Param and Nop represents the
following:
Param The number of measurement items currently displayed on screen. Each
measurement item can be one of measurement parameters 1 through 4,
the results of test signal current/voltage level monitoring, or the result
of R
dc
measurement.
Nop The number of measurement points per measurement cycle. The
number should be “1” for single-point measurement or, for list
measurement, the number of points defined in the active table.
Starting data capture
You can begin capturing the measurement data for statistical analysis by issuing the
command shown below. Once you have issued the command, each measured value (for
measurement parameters 1 through 4, test signal current/voltage level monitoring, or R
dc
measurement) is stored in the volatile memory (RAM) provided that the measured value is
currently shown on screen.
• :CALC:EXAM:STAR on page 228
If previously captured data is still in the volatile memory and you issue the command, the
instrument clears the existing data and then begins capturing new data.
Completion of data capture
The instrument finishes capturing the data when:
• The number of captured data segments reaches the maximum number.
•The :CALC:EXAM:GET? command starts another session of statistical analysis.
To check the progress of data capture, examine the number of data segments stored in the
volatile memory (RAM) by issuing the following command:
• :CALC:EXAM:POIN? on page 226
Saving the captured data
To save the measurement data for statistical analysis from the volatile memory to a file, use
the following command. See “Saving data to a file” on page 126 for more information.
• :MMEM:STOR on page 291