Hioki 8847 - Page 222

13.3 Setting FFT Analysis Conditions
212
Relationship Between Frequency Range, Resolution and Number of
Analysis Points
Range
[Hz]
Sampling
frequency
[Hz]
Timebase
[/div]
(MEM)
Sampling
period
Number of FFT Analysis Points
1,000 2,000 5,000 10,000
Resolu-
tion [Hz]
Acquisi-
tion
interval
Resolu-
tion [Hz]
Acquisi-
tion
interval
Resolu-
tion [Hz]
Acquisi-
tion
interval
Resolu-
tion [Hz]
Acquisi-
tion
interval
8 M *
1
20 M 5 μs 50 ns 20 k 50 μs 10 k 100 μs 4 k 250 μs 2 k 500 μs
4 M *
1
10 M 10 μs 100 ns 10 k 100 μs 5 k 200 μs 2 k 500 μs1 k1 ms
2 M *
1
5 M 20 μs 200 ns 5 k 200 μs 2.5 k 400 μs 1 k 1 ms 500 2 ms
800 k *
1
2 M 50 μs 500 ns 2 k 500 μs 1 k 1 ms 400 2.5 ms 200 5 ms
400 k *
1
1 M 100 μs1 μs 1 k 1 ms 500 2 ms 200 5 ms 100 10 ms
200 k *
1
500 k 200 μs2 μs 500 2 ms 250 4 ms 100 10 ms 50 20 ms
80 k *
1
200 k 500 μs5 μs 200 5 ms 100 10 ms 40 25 ms 20 50 ms
40 k
100 k 1 ms 10
μs 100 10 ms 50 20 ms 20 50 ms 10 100 ms
20 k
50 k 2 ms 20
μs 50 20 ms 25 50 ms 10 100 ms 5 200 ms
8 k
20 k 5 ms 50
μs 20 50 ms 10 100 ms 4 250 ms 2 500 ms
4 k
10 k 10 ms 100
μs 10 100 ms 5 200 ms 2 500 ms 1 1 s
2 k
5 k 20 ms 200
μs 5 200 ms 2.5 400 ms 1 250 ms 500 m 2 s
800
2 k 50 ms 500
μs 2 500 ms 1 1 s 400 m 2.5 s 200 m 5 s
400
1 k 100 ms 1 ms 1 1 s 500 m 2 s 200 m 5 s 100 m 10 s
200
500 200 ms 2 ms 500 m 2 s 250 m 4 s 100 m 10 s 50 m 20 s
80
200 500 ms 5 ms 200 m 5 s 100 m 10 s 40 m 25 s 20 m 50 s
40
100 1 s 10 ms 100 m 10 s 50 m 20 s 20 m 50 s 10 m 100 s
20
50 2 s 20 ms 50 m 20 s 25 m 40 s 10 m 100 s 5 m 200 s
8 *
2
20 5 s 50 ms 20 m 50 s 10 m 100 s 4 m 250 s 2 m 500s
4 *
2
10 10 s 100 ms 10 m 100 s 5 m 200s 2 m 500 s 1 m 1 ks
1.33 *
2
3.33 30 s 300 ms 3.33 m 300 s 1.66 m 600s 666 μ 1.5 ks 333 μ 3 ks
800 m *
2
2 50 s 500 ms 2 m 500 s 1 m 1 ks 400 μ 2.5 ks 200 μ 5 ks
667 m *
2
1.67 60 s 600 ms 1.66 m 600 s 833 μ 1.2 ks 333 μ 3 ks 166 μ 6 ks
400 m *
2
1 100 s 1 s 1 m 1 ks 500 μ 2 ks 200 μ 5 ks 100 μ 10 ks
333 m *
2
833 m 120 s 1.2 s 833 μ 1.2 ks 416 μ 2.4 ks 166 μ 6 ks 83.3 μ 12 ks
133 m *
2
333 m 300 s 3 s 333 μ 3 ks 166 μ 6 ks 66.6 μ 15 ks 33.3 μ 30 ks
The cut-off frequency of the anti-aliasing filter is the same as the frequency range.
*1. The anti-aliasing filter is turned off.
*2. Cut-off frequency is 20 Hz.