Hioki MR8740, Instruction Manual

Page: 247 / 424

10.3 Waveform Calculation Operators and Results
235
9
Chap
ter 10
W
avefo
rm Calculation
Functions
10
First integral (INT)
Second integral (INT2)
First and second integrals are calculated using the trapezoidal rule.
d
1
to d
n
are the integrals calculated for sample times t
1
to t
n
.
Calculation formulas for the first integral
Point
t
1
I
1
= 0
Point
t
2
I
2
= (d
1
+ d
2
)h/2
Point
t
3
I
3
= (d
1
+ d
2
)h/2 + (d
2
+ d
3
)h/2 = I
2
+ (d
2
+ d
3
)h/2
↓
Point
t
n
I
n
= I
n-1
+ (d
n-1
+ d
n
)h/2
I
1
to
I
n
: calculation results
h =
Δ
t
: Sampling Period
Calculation formulas for the second integral
Point
t
1
II
1
= 0
Point
t
2
II
2
= (I
1
+ I
2
)h/2
Point
t
3
II
3
= (I
1
+ I
2
)h/2 + (I
2
+ I
3
)h/2 = II
2
+ (I
2
+ I
3
)h/2
↓
Point
t
n
II
n
= II
n-1
+ (I
n-1
+ I
n
)h/2
II
1
to
II
n
: calculation results
Digital Voltmeter Unit
PLC delay time shift
(PLCS)
Shifts the time by the amount of delay for the frequency (PLC) and NPLC set on MR8990
Digital Voltmeter Unit.
Since the Digital Voltmeter Unit obtains the average of the amount of time set for NPLC,
a waveform that is delayed by just a time that is 1/2 of the NPLC is observed, compared
to 8966 Analog Unit. The PLCS calculation shifts this amount of delay time to correct the
offset with the analog unit.
Reference: If there is no data at the end of the calculation result, the voltage becomes 0
V.
b
i
: ith member of calculation result data, d
i
: ith member of source channel data
Waveform Calculation Type Description