Hioki 8730-10 - Measurement Limit Frequency; Averaging Equations

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13.2 Reference
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13.2.3 Measurement Limit Frequency
1
2
3
25
24
Si
g
nal c
y
cle
23
TIME/DIV (s/DIV) Sampling period (s)
Measurement limit
frequency
(Hz)
100 μ
200 μ
500 μ
1m
2m
5m
10 m
20 m
50 m
100 m
200 m
500 m
1
2
5
10
30
1 min (60)
2 min (120)
5 min (300)
1 μ
2 μ
5 μ
10 μ
20 μ
50 μ
100 μ
200 μ
500 μ
1m
2m
5m
10 m
20 m
50 m
100 m
300 m
600 m
1.2
3
40 k
20 k
8k
4k
2k
800
400
200
80
40
20
8
4
2
0.8
0.4
0.1333
0.0666
0.0333
0.0133
13.2.4 Averaging Equations
As a general rule, to ensure that sampling catches the peaks of a typical
sine wave input on the display, more than 25 samples are required for
each input cycle.
The measurement limit frequency changes depending on the time axis
range.
For averaging, summing averaging is synchronized by the trigger. If
trigger synchronization is not performed, the results will be meaningless.
Summing averaging
Captured data are added sequentially and the sum is divided by the number
of samples.
An = { (n - 1)A
n-1
+Z
n
}/n
n : Averaging count
A
n
: Result of n times averaging
Z
n
: n-th measurement data