9-28 IM 701450-01E
Cycle Averaging
• Divides one period of computed data into the specified number of data points (Cycle
Count). This is done across multiple periods of data from the start to the end position
of the computation. Then, the average of the data points at the same position across
multiple periods is determined. The resulting waveform is displayed. You can set the
following items.
Item Selectable Range
Cycle Count 10 to 1800, positive integer.
(The number of data points of 1 cycle that is to be averaged)
* The data from the computation start position to the end position is averaged. However, the
remaining data that is not divisible by the Cycle Count are ignored.
Example
When the record length is 10 k, the Cycle Count is 720, the start point of computation is
–5.000 divisions, and the end point is +5.000 divisions
10k/720 = 13.88... 13 cycles will be averaged.
13×720 = 9360 Data between the start point to the 9360
th
point will be cycle averaged.
• Cycle averaging cannot be performed on the waveform obtained through the FFT.
Peak Computation
Determines the maximum value at each point of the computed data and displays the
waveform. For each computation, the new computed value is compared with the past
computed value and the larger value is kept.
Note
• Normally, the DL7400 determines the vertical waveform display range by performing auto
scaling on the first computed waveform. If the amplitude of the computed waveform varies
greatly such as in the coherence function, use manual scaling.
• If an averaged waveform is auto scaled and you change the scaling to manual when
measurement is stopped, the setting does not take effect. The setting takes effect the next
time measurement is started.
• When averaging is selected (excluding cycle averaging), computation is not performed again
when measurement is stopped. For example, even if the equation is changed, the computed
waveform does not change. The new setting is enabled the next time measurement is
started. However, if you change the number of data points of cycle averaging, recalculation is
performed even when measurement is stopped.
• Averaging cannot be performed on the pulse width waveform.
• If you change the computation conditions while averaging is in progress, the computed data
up to that point is cleared. Then, averaging starts.
• Averaging and peak computation cannot be performed when the trigger mode is set to
SINGLE(N) mode.
Effects of Linear Scaling
If linear scaling is performed on the channel to be computed, computation is performed
using linearly scaled values.
9.9 Performing User-Defined Computation (Optional)
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