MR8740T_user_manual_eng_20191016H.pdf - 第163页

158 Numerical Calculation T ypes and Descriptions

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157
Numerical Calculation Types and Descriptions
Calculation
type
Description
Accumulation
Method:
Positive
(Only the
positive-
amplitude part)
Calculates an accumulation (unit: V) enclosed
by the zero-level (zero-potential) line and the
positive-amplitude part of a signal waveform.
When the range is specied, calculates the
accumulation between the cursors.
S: Accumulation
n
: Number of data points
di
:
i
th data point acquired
across the channel
di
S =
∑
i = 1, di > 0
n
s
1
s
1
Cursor A
Cursor B
S
=
s
1
Accumulation
Method:
Negative
(Only the
negative-
amplitude part)
Calculates an accumulation (unit: V) enclosed
by the zero-level (zero-potential) line and the
negative-amplitude part of a signal waveform.
When the range is specied, calculates the
accumulation between the cursors.
S: Accumulation
n
: Number of data points
di
:
i
th data point acquired
across the channel
di
S =
∑
i = 1, di < 0
n
sss
2
ss
2
Cursor A
Cursor B
S
= −
s
2
Angle of XY
waveform
Calculates a regression line of an X-Y composite
curve, and then a slope angle.
°[]
θ
= arctan(SLOPE)
180 /
π
θ
: Angle at which the regression line is
with X-axis
xi
:
i
th data point acquired across the
X-axis channel
yi
:
i
th data point acquired across the
Y-axis channel
x
―
: Average value of the X-axis channel
y
―
: Average value of the Y-axis channel
SLOPE =
∑
n
i=1
(x
i
− x )
2
∑
n
i=1
(x
i
− x )
(y
i
− y )
Regression line
7
Numerical Calculation Function
158
Numerical Calculation Types and Descriptions
159
8
Waveform Calculation Function
The instrument makes calculations using acquired waveform data and pre-dened arithmetic
expressions to numerically display calculation results on the waveform screen.
When the real-time save is set to [On], you cannot use the waveform calculation function.
> [Calculation] > [Waveform calculation]
Operation available on the [Waveform calculation] screen
Waveform Calculation
• Four arithmetic operations (+, −, ×,
÷)
• Absolute value (ABS)
• Exponent (EXP)
• Common logarithm (LOG)
• Square root (SQR), cube root
(CBR)
• Moving average (MOV)
• Parallel move in the time axis
direction (SLI)
• Differential (1st-order [DIF], 2nd-
order [DIF2])
• Integration (1st-order [INT], 2nd-
order [INT2])
• Trigonometric function (SIN, COS,
TAN)
• Inverse trigonometric function
(ASIN, ACOS, ATAN, ATAN2)
• Waveform shifting by the PLC
delay time specied in Model
MR8990 Digital Voltmeter Unit
(PLCS)
(12 types in total)
Waveform parameter
• Average value (PAVE)
• Maximum value (PMAX)
• Minimum value (PMIN)
• Level (PLEVEL)
• Calculation by specifying a range
between cursors
You can specify a calculation
range between trace cursors A
and B or between trace cursors C
and D.
Details about arithmetic
expressions
“8.3 Operators of Waveform
Calculation and Calculation Results”
(p. 169)
In addition to the four arithmetic operations, 11 functions are available to calculate waveform data. You
can specify up to 16 arithmetic expressions.
When the scaling function is enabled, the instrument makes calculations using scaled values.
8 Waveform Calculation Function
8
Waveform Calculation Function