GRAPHTEC WR300 - Calculation Settings

Recorder Mode
3-25
3.10 Calculation Settings
(1)(2)
(1) Statistical Calculation
............................. The Statistical Calculation function performs calculation on the captured memory
data and Readout data specified by the cursors.
Standard Deviation (n):
Displays the standard deviation of the cursor-defined range of data.
σn = (ΣD
2
— (ΣD)
2
/n)/n (n — 1)
D: Data, n: No. of data points
Standard Deviation (n-1):
Displays the standard deviation of the cursor-defined range of data.
σn = (ΣD
2
— (ΣD)
2
/n)/(n — 1) (n — 1) D: Data, n: No. of data points
Maximum and Minimum Values (Min/Max):
Displays the maximum and minimum values within the cursor-defined range of data.
Maximum minus Minimum Value (P-P):
Displays the difference between the maximum value and minimum value (peak-
to-peak value) within the cursor-defined range of data.
RMS Value:
Displays the root mean square within the cursor-defined range of data.
R.M.S. = ΣD
2
/n
D: Data, n: No. of data points
Rise Time :
Displays the rise time of a waveform displayed within a cursor-defined range of
waveform data. The calculation of the rise time varies with the direction of the
cursors.
When the cursors are in the time axis direction
After determining the maximum and minimum values within a cursor-defined
range of data, the target waveform is that which first passes their mid-point
value. Assuming that the minimum and maximum values are respectively 0%
and 100%, the Rise Time is calculated within the range of 10% to 90%.
Min value
Mid-point value
Max value
Cursor A Cursor B
90%
10%
Rise time