1.2 Measuring Input Section

Noise Elimination from Input Signals

Filter and Moving Average

This function used to suppress the effects of noise that is riding on the signal. The pen model and dot model are equipped with a filter function and a moving average function, respectively. The function can be set for each measurement channel. However, it does not operate on channels set to ON/OFF input.

Filter (Pen Model)

The filter is a low-pass filter. The time constant can be set to 2 s, 5 s, or 10 s.

Filter result (output for a step input)

Input

63.2% of the output value

Output response curve (when using the filter)

2, 5, 10 s (time constant, the time it takes to reach 63.2% of the output value)

Moving Average (Dot Model)

The average value of the m most recent values acquired at the scan interval is used as the measured value of the channel. The number of moving-averaged data points

(m) can be set in the range 2 to 16. The figure below shows an example indicating the operation of the buffer for the moving average computation when the number of moving averaged data points is set to 5.

Buffer data for the

Buffer data for the

Buffer data for the

nth sampling time

n+1th sampling time

n+2th sampling time

1

Functional Description

110.0 mV

25.0 mV

30.0 mV

4–5.0 mV

5–10.0 mV

Most recent data

15.0 mV

10.0 mV

5.0 mV

0.0 mV

–5.0 mV

Most recent data

10.0mV

15.0mV

10.0mV

5.0mV

0.0mV

Moving

 

Deleted

Deleted

0.0 mV

 

5.0 mV

 

8.0 mV

average

 

 

<Related Topics>

Setting the filter: Section 7.12 and 6.2

Setting the moving average: Section 7.11 and 6.3

1-5

Page 19
Image 19
Omega RD100B Noise Elimination from Input Signals, Measuring Input Section, Filter and Moving Average, Filter Pen Model