Hioki MR8827, Инструкция по эксплуатации

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223
Numerical Calculation Type and Description
Numerical calculation
type
Description
Rise Time and
Falltime
The rise time of the acquired waveform from
A% to B% (or fall time from B% to A%) is
calculation using a histogram (frequency
distribution) of the 0 and 100% levels of the
acquired waveform.
As waveform data is acquired, the rise time (or
fall time) is determined from the first rising (or
falling) edge.
When calculating over the range specified
by the AB cursors, the rise time (or fall time)
is based on the first rising (or falling) edge
between the cursors.
The % value for A can be specified. The value
for B is determined automatically based on
the value of A, such as 95% when A is 5% and
70% when A is 30%.
Fall Time
Rise Time
B%
A%
A: 5% to 30%
B: 95% to 70%
Standard Deviation
(Std Dev)
Calculates the standard deviation of the waveform data.
σ = √
1
𝑛𝑛 ∑(𝑑𝑑𝑑𝑑 − 𝐴𝐴𝐴𝐴𝐴𝐴)
2
𝑛𝑛
𝑖𝑖=1
σ : Standard Deviation
AVE: Average
n: Data count
di: Data on channel number i
Area
Calculates the area value (V•s) enclosed by the
zero position (point of zero potential) and the
signal waveform.
When calculating over the range specified by the
AB cursors, the calculated area is constrained to
the waveform between the cursors.
𝑆𝑆 = ∑|𝑑𝑑𝑑𝑑| • ℎ
𝑛𝑛
𝑖𝑖=1
S: Area
n: Data count
di: Data on channel number i
h=
Δ t: Sampling rate
A cursor
B cursor
Area of shaded portion
X-Y Area
Calculates the area (V 2 ) 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 AB cursors (Voltage
axis or Trace) on the time-domain waveform of each channel for X-Y composition. (The
area cannot be specified directly by AB cursors on the X-Y waveform.)
About AB Cursor, refer to “7.1 Read Measurement Values (Using the AB Cursors)”
(p. 122).
Start/end point
S = n x s
S
n : Number of loops
When the trace consists of multiple
loops
When the trace is an open curve
End point
S = s 0
S : Area
a (Area enclosed by the curve
and line connecting start and
end points)
Start
point
s0 s0
S = | s 0 - s 1|
S : Area
When the trace is a figure-8 When the trace is an open curve
End
point
S = s 0 x 2 + s 1
S : Area
(The number of overlapping
regions increases with the
number of loops)
Start
point
s0
s1
End point
Start
point
s1
s0
: Area
0
Setting Choices: Set the X- and Y-axis channels.
10
Numerical Calculation Functions