Hioki MEMORY HiCORDER MR8847-01 Instruction Manual page 202

192
10.6 Numerical Calculation Type and Description
Numerical Calculation
Type
Rise Time and
Fall Time
Standard Deviation
(Std Dev)
Area
X-Y Area
Description
The rise time of the acquired waveform from
A% to B% (or fall time from B% to A%) is ob-
tained by calculation using a histogram (fre-
quency distribution) of the 0 and 100%
levels of the acquired waveform.
As waveform data is acquired, the rise time
(or fall time) is obtained from the first rising
(or falling) edge.
When calculation of the range specified by
the A/B cursors is selected, the obtained
rise time (or fall time) is the first rising (or
falling) edge between the cursors.
Obtains the standard deviation of the waveform data.
n
1
2


 
di AVE
-- -
= –
n
i 1
=
Obtains the area value (V•s) enclosed by
the zero position (point of zero potential)
and the signal waveform.
When calculation of the range specified by
the A/B cursors is selected, the calculated
area is constrained to the waveform be-
tween the cursors.
S: Area
n
n: Data count


S di h
=
di: Data on channel number i

i 1
=
h= t: Sampling rate
2
Obtains the area (V ) of an X-Y composite waveform. In the following figures, the areas
within the lines are calculated. The calculation is available even if the X-Y composite
waveform is not intended for display.
To enable area calculation, specify the calculation range using the A/B cursors (Voltage
axis or Trace) on the waveform of each channel for X-Y composition. (The area cannot
be specified directly by A/B cursors on the X-Y waveform.)
See: About A/B Cursor:"7.1 Reading Measurement Values (Using the A/B Cursors)"

( p.108)
When the trace consists of multiple
loops
S = n x s 0
S: Area
s 0
n: Number of loops
Start/end point
When the trace is a figure-8
S = | s 0 - s 1 |
s 1
S: Area
s 0
Start
End point
point
Setting Choices: Set the X- and Y-axis channels.
B%
A%
Rise Time
A: 5 to 30%
B: 95 to 70%

: Standard Deviation
AVE: Average
n: Data count
di: Data on channel number i
A cursor
When the trace is an open curve
s 0
Start
point
End point
When the trace is an open curve
s 1
s 0
Start
point
Fall Time
Area of shaded po
B cursor
S = s 0
S: Area
(Area enclosed by the curve
and line connecting start
and end points)
S = s 0 x 2 + s 1
S: Area
(The number of overlapping
regions increases with the
number of loops)
End
point